Friday, 18 November 2022

How To Resolve/Fix 'ServerManager' Object Has No Attribute 'user info' I...


If you’ve encountered the 'ServerManager' object has no attribute 'user info' error in PostgreSQL pgAdmin 4, you’re not alone. This common error can be frustrating, but with the right steps, it can be resolved quickly. In this tutorial, we guide you through the process of identifying the cause of this issue and implementing the correct fix.

We begin by explaining what this error means and why it occurs in the PostgreSQL environment. You'll learn about the underlying factors that can lead to this issue, such as configuration problems or software bugs. Then, we provide a detailed, step-by-step walkthrough of the solution, ensuring that you can follow along and apply the fix to your own setup.

Additionally, the video covers preventative measures to help you avoid encountering this error in the future. By understanding the root cause and applying best practices in your PostgreSQL and pgAdmin 4 configurations, you can maintain a more stable and reliable database environment.

This tutorial is essential for database administrators, developers, or anyone who regularly works with PostgreSQL and pgAdmin 4. Whether you’re troubleshooting this error for the first time or looking to improve your PostgreSQL management skills, this video offers valuable insights and solutions.

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Download pgAdmin 4: https://www.pgadmin.org/download/pgadmin-4-windows/ How To Resolve/Fix 'ServerManager' Object Has No Attribute 'user info' In PostgreSQL pgAdmin 4 v6.16 'ServerManager' object has no attribute 'user_info' For PostgreSQL 15, the pgAdmin is not supported. We have the pgAdmin 4 6.8 version. But we need to install the latest version which comes with the installation file for PostgreSQL. I have already made that video. The link is in the description to download that. So we need to download only the pgAdmin. If we want to keep our database as it is. The pgAdmin download link is given in the video description. We have version 6.8 but the latest v is 6.16 Before installing this one, let's close the pgAdmin. Open the pgAdmin 4 v6 As we can see, I am able to log in to PostgreSQL 15 version. Also, I can see my PostgreSQL 14 as well, along with my previous works. Well, if you don't want to keep the previous version at all. Uninstall the existing system PostgreSQL. Then install PostgreSQL 15, which will come with the latest version of pgAdmin 4 itself. Thanks for watching... How To Resolve/Fix 'ServerManager' Object Has No Attribute 'user info' In PostgreSQL pgAdmin 4, Resolve/Fix 'ServerManager' Object Has No Attribute 'user info', 'ServerManager' Object Has No Attribute 'user info', Resolve/Fix 'ServerManager' Object Has No Attribute 'user info', Resolve 'ServerManager' Object Has No Attribute 'user info', Fix 'ServerManager' Object Has No Attribute 'user info', PostgreSQL pgAdmin 4, PostgreSQL, internal server error, resolve server error, fix server manager, fix user info postgres

Wednesday, 16 November 2022

How To Call A Stored Procedure From Another Stored Procedure In PostgreS...


In this tutorial, we explore a powerful feature of PostgreSQL: calling a stored procedure from another stored procedure using PL/pgSQL. This capability allows you to create more modular and organized database operations, making your code easier to maintain, reuse, and manage.

The video starts by introducing the concept of stored procedures in PostgreSQL and explains why you might want to call one stored procedure from another. We then dive into the syntax and structure required to implement this technique, providing clear, step-by-step instructions. You'll see how to pass parameters between procedures, handle return values, and manage potential errors effectively.

Additionally, the tutorial includes practical examples that demonstrate how nested stored procedures can be used in real-world database applications, such as managing complex business logic, automating repetitive tasks, or structuring large codebases. We also cover best practices for writing PL/pgSQL code, ensuring that your stored procedures are efficient, readable, and maintainable.

By the end of this video, you'll have a solid understanding of how to leverage nested stored procedures in PostgreSQL, enabling you to build more sophisticated and flexible database applications.

Whether you’re a database administrator, developer, or just looking to deepen your PostgreSQL knowledge, this tutorial provides the insights and techniques you need to effectively use stored procedures in PL/pgSQL.

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/*In this video we will see how to call a stored procedure 
from another stored procedure in PostgreSQL PLpgSQL*/

-- Please watch till the end, and leave a like-comment.
-- Don't forget to subscribe the channel

CREATE OR REPLACE PROCEDURE public.proc1()
LANGUAGE 'plpgsql'
AS $BODY$
DECLARE
BEGIN
 RAISE NOTICE 'This is proc 1, it will be called from proc2';
END;
$BODY$;

-- This is proc1 I have created
-- This will display the output
-- so, lets create it


CREATE OR REPLACE PROCEDURE public.proc2()
LANGUAGE 'plpgsql'
AS $BODY$
DECLARE
BEGIN
RAISE NOTICE 'This is proc 2';
-- Calling another procedure proc1()
call proc1(); -- here it is
END;
$BODY$;

-- This is proc2
-- I am calling proc1 inside proc2
-- When it gets executed, it should give output like this

-- 'This is proc 2'
-- 'This is proc 1, it will be called from proc2'

-- Now, lets call the procedure

-- In the next video, I will show how to call a parameterized procedure or function with
-- OUT parameter
-- Please subscribe the channel to get updates for such videos

call proc2();

-- As shown, the procedure is getting called from another procedure
-- Thanks for watching
-- Please leave your comment for the video

-- Source codes you will find from video description

Sunday, 28 August 2022

How To Resolve/Fix PostgreSQL Default Value Not Working || PostgreSQL Co...


If you’re facing issues with PostgreSQL default values not working in your columns, this tutorial is here to help. Default values are a key feature in database management, ensuring that specific columns automatically populate with preset data when no value is provided. However, there are times when these default values might not function as expected, leading to potential data inconsistencies or application errors.

In this video, we explore the possible reasons why default values might not be applied in your PostgreSQL database, such as incorrect column definitions, conflicts with triggers, or issues within the pgAdmin interface. We provide a detailed, step-by-step guide to diagnosing and fixing these problems, ensuring that your default values are correctly implemented and operational.

We start by reviewing how to properly set default values in PostgreSQL, including using the SQL DEFAULT clause in table definitions. Then, we demonstrate common pitfalls that could prevent these defaults from working, along with practical solutions to resolve each issue. You'll also learn how to test and validate that the default values are working as intended after applying the fix.

Whether you’re a seasoned database administrator or a developer just getting started with PostgreSQL, this tutorial will equip you with the knowledge to troubleshoot and fix default value issues efficiently. By the end of the video, you'll have a clear understanding of how to manage default values in PostgreSQL, ensuring your database remains reliable and consistent.

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-- In this video, we will

-- Use A Default Value
-- Default Value Not Working
-- Alter Column With A Default Value
-- Alter Column Datatype

-- So, keep watching and subscribe my channel

CREATE TABLE EMP(
ID NUMERIC,
NAME CHARACTER VARYING(20),
SALARY NUMERIC(10,2),
DEPTNO CHARACTER VARYING(10)
);


INSERT INTO EMP(id,name,salary,deptno)
values(1,'Akram',100.23,'10');
select * from emp;

-- Now, let's alter the table, and make Salary column default


Alter table emp alter column salary set default 50;

-- First I will show you when it works and then it won't work.


INSERT INTO EMP(id,name,deptno)
values(2,'Sohail','10');
-- This must have inserted salary as 50, which I have set default value.
-- Let's check

Select * from emp;

-- Now, I will show you when default value won't work

INSERT INTO EMP(id,name,salary,deptno)
values(3,'Knowledge 360',null,'15');

-- Here, the salary must be inserted as NULL

Select * from emp;

-- So, the conclusion is, whenever we give the default value, we do not
-- need to mention the column in the insert statement.
-- If we do so, then we have to put some value, even if it is null
-- The database will accept the null


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Thursday, 18 August 2022

How To Create Sequence In PostgreSQL And Usage Of Sequence || Table Prim...


Sequences in PostgreSQL are a powerful tool for managing auto-incrementing values, often used for primary keys in tables or as a part of stored procedures to maintain data consistency and integrity. In this comprehensive tutorial, we walk you through the process of creating and using sequences in PostgreSQL, ensuring you have the skills to implement them effectively in your database projects.

The video starts with an introduction to sequences, explaining what they are and why they are essential in PostgreSQL. We then provide step-by-step instructions on how to create a sequence, from the basic SQL commands to more advanced options that allow you to customize how your sequence behaves.

Next, we explore the practical applications of sequences, particularly how they can be linked to table columns as primary keys, ensuring that each new entry automatically receives a unique value. This is a crucial aspect of database management, as it helps maintain data integrity and avoid conflicts in primary key values.

We also dive into how sequences can be utilized within stored procedures, allowing for dynamic data operations that can adapt to changing conditions within your database. Whether you’re automating tasks or managing large datasets, understanding how to integrate sequences into your stored procedures will make your database operations more efficient and robust.

This tutorial is essential for anyone looking to deepen their PostgreSQL knowledge, particularly in areas related to database management and stored procedures. By the end of the video, you'll be equipped with the skills to create, manage, and utilize sequences effectively in your PostgreSQL databases.

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How To Create Sequence In PostgreSQL And Usage Of Sequence || Table Primary Key || Stored Procedure

CREATE SEQUENCE tbl_emp_seq
START WITH 1 -- VALUE WILL START WITH 1
INCREMENT BY 1 -- IT WILL GET INCREMENT BY 1
MINVALUE 1 -- MINIMUM VALUE CAN BE 1
MAXVALUE 10 -- MAXIMUM VALUE CAN BE 10
CYCLE; -- CYCLE MEANS, AFTER REACHING MAXVALUE, WHICH IS 10 HERE, THE SEQUENCE WILL START AGAIN FROM 1
-- NOW LET'S SEE THE SEQUENCE VALUE
-- USE THE BELOW STATEMENT FOR SEQUENCE VALUE

SELECT NEXTVAL('tbl_emp_seq');

-- THE VALUE REACHED MAXVALUE, NOW IT WILL AGAIN START FROM 1

-- NOW LET'S SEE THE CASE OF NO CYCLE
-- IN CASE OF NO CYCLE, THE SEQUENCE WON'T START AGAIN FROM 1
-- IT WILL THROW AN ERROR AFTER REACHING THE MAX VALUE

DROP SEQUENCE tbl_emp_seq;


CREATE SEQUENCE tbl_emp_seq
START WITH 1 -- VALUE WILL START WITH 1
INCREMENT BY 1 -- IT WILL GET INCREMENT BY 1
MINVALUE 1 -- MINIMUM VALUE CAN BE 1
MAXVALUE 10 -- MAXIMUM VALUE CAN BE 10
NO CYCLE; 


SELECT NEXTVAL('tbl_emp_seq');

-- HERE THE MAX VALUE IS REACHED, SO IF WE TRY TO GET THE VALUE AFTER THAT, WE WILL GET AN ERROR

ERROR:  nextval: reached maximum value of sequence "tbl_emp_seq" (10)
SQL state: 2200H

-- THIS IS WHY WE USUALLY KEEP THE MAXVALUE VERY HIGH AS MUCH POSSIBLE

-- NOW LET'S CREATE AN ACTUAL SEQUENCE AND USE IN A TABLE TO GENERATE VALUES AUTOMATICALLY

CREATE SEQUENCE tbl_emp_seq
START WITH 1 -- VALUE WILL START WITH 1
INCREMENT BY 1 -- IT WILL GET INCREMENT BY 1
MINVALUE 1 -- MINIMUM VALUE CAN BE 1
MAXVALUE 10000000000 -- MAXIMUM VALUE CAN BE 10
NO CYCLE; 


CREATE TABLE EMP
(
EMP_ID INTEGER DEFAULT NEXTVAL('tbl_emp_seq'),
EMP_NAME VARCHAR(50),
SALARY NUMERIC(5,2)
);

INSERT INTO EMP(EMP_NAME,SALARY) VALUES ('AKRAM',100.56);
INSERT INTO EMP(EMP_NAME,SALARY) VALUES ('SOHAIL',670.56);
INSERT INTO EMP(EMP_NAME,SALARY) VALUES ('KNOWLEDGE 360',757.87);

SELECT * FROM EMP;

-- WE CAN SEE, THE EMP_ID VALUES ARE GENERATED FROM SEQUENCE

-- NOW LET'S USE THE SEQUENCE IN A STORED PROCEDURE

CREATE OR REPLACE PROCEDURE public.EMP_PROC()
LANGUAGE 'plpgsql'
AS $BODY$
DECLARE
V_EMP_SEQ_VAL INTEGER;
BEGIN
SELECT NEXTVAL('tbl_emp_seq') into V_EMP_SEQ_VAL;
insert into emp(emp_id,emp_name,salary) values (V_EMP_SEQ_VAL,'New Emp',455.24);
END;
$BODY$;

call public.EMP_PROC();

select * from emp;

SELECT NEXTVAL('tbl_emp_seq');

SELECT CURRVAL('tbl_emp_seq');

-- also we can see the current value of a sequence

-- If you have any doubt, please ask me in the comments.
-- Subscribe the channel to get the videos updates.

Sunday, 17 July 2022

How To Call A Stored Procedure From A Schedule Job Using pgAgent Jobs In...


In this tutorial, we dive into the world of automating PostgreSQL tasks by calling a stored procedure from a scheduled job using pgAgent in PostgreSQL. PgAgent is a powerful job scheduling tool that integrates seamlessly with PostgreSQL, allowing you to automate repetitive tasks such as running stored procedures, backups, and more.

We begin by guiding you through the setup of pgAgent in pgAdmin, ensuring that you have the necessary environment to start automating your database operations. Then, we move on to creating a stored procedure that performs a specific task within your database. This stored procedure will later be triggered automatically by a scheduled job.

The tutorial provides a step-by-step demonstration of how to create and configure pgAgent Jobs. You’ll learn how to set up schedules, define the tasks that need to be performed, and link these tasks to your stored procedures. We also discuss the various options available within pgAgent, such as setting execution frequency, handling job success or failure, and logging the job outcomes.

Additionally, we explore practical use cases where automating stored procedure execution can significantly enhance your database management strategy. Whether it’s for regular maintenance tasks, complex data manipulations, or timed reports, pgAgent Jobs provide a reliable and efficient solution.

By the end of this video, you'll have a solid understanding of how to use pgAgent to automate stored procedure calls in PostgreSQL, helping you streamline your database operations and save time.

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In this video, we will see how to schedule a stored procedure
to call in pgAgent Jobs

In the last video, we have seen how to schedule a job.
In this video, we will call a stored procedure.

So, let's start.

How To Call A Stored Procedure From A Schedule Job Using pgAgent Jobs In PostgreSQL Database pgAdmin || PostgreSQL pgAgent 



-- Creating a table

CREATE TABLE public.emp
(
    id numeric,
    name character(30),
    salary numeric,
insert_date timestamp without time zone DEFAULT CURRENT_TIMESTAMP
);



-- Now we will create a stored procedure

CREATE OR REPLACE PROCEDURE public.testing_procedure()
LANGUAGE 'plpgsql'
AS $BODY$
DECLARE
BEGIN
Insert into emp(id,name,salary) values(1,'Akram Sohail',100);
Insert into emp(id,name,salary) values(2,'Knowledge 360',200);
END;
$BODY$;

CALL public.testing_procedure();

-- When this procedure will be called, two entries will be there in the Emp table.

-- Let's do it through a scheduled job using pgAgent Jobs

-- We have scheduled the procedure to be called every minute, every hour, every day, and all.

-- the First scheduler will be executed at 11:30 PM IST.
-- So, let's forward the video and wait.

Select * from emp;

-- There is no record as of now because the scheduler is not executed by now.
-- waiting...

-- We get two records at 11:30 PM as we can see from a timestamp.
-- Now, again new entries will come at 11:31 PM

-- So, our schedule job is working.
-- All the source codes and notes are in the description.
-- Please subscribe to my channel...Thank you :)




DO $$
DECLARE
    jid integer;
    scid integer;
BEGIN
-- Creating a new job
INSERT INTO pgagent.pga_job(
    jobjclid, jobname, jobdesc, jobhostagent, jobenabled
) VALUES (
    1::integer, 'New_Job'::text, 'This job will be used to call a stored procedure.'::text, ''::text, true
) RETURNING jobid INTO jid;

-- Steps
-- Inserting a step (jobid: NULL)
INSERT INTO pgagent.pga_jobstep (
    jstjobid, jstname, jstenabled, jstkind,
    jstconnstr, jstdbname, jstonerror,
    jstcode, jstdesc
) VALUES (
    jid, 'Step1'::text, true, 's'::character(1),
    ''::text, 'postgres'::name, 'f'::character(1),
    'CALL public.testing_procedure(); -- Calling the stored procedure'::text, 'This is Step1'::text
) ;

-- Schedules
-- Inserting a schedule
INSERT INTO pgagent.pga_schedule(
    jscjobid, jscname, jscdesc, jscenabled,
    jscstart, jscend,    jscminutes, jschours, jscweekdays, jscmonthdays, jscmonths
) VALUES (
    jid, 'Scheduler1'::text, 'The Scheduler'::text, true,
    '2022-07-17 23:30:00+05:30'::timestamp with time zone, '2022-07-31 23:31:00+05:30'::timestamp with time zone,
    -- Minutes
    ARRAY[true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true]::boolean[],
    -- Hours
    ARRAY[true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true]::boolean[],
    -- Week days
    ARRAY[true,true,true,true,true,true,true]::boolean[],
    -- Month days
    ARRAY[true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true,true]::boolean[],
    -- Months
    ARRAY[true,true,true,true,true,true,true,true,true,true,true,true]::boolean[]
) RETURNING jscid INTO scid;
END
$$;




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Tuesday, 21 June 2022

How To Restore/Load PostgreSQL Database From .BAK/Backup File Using Comm...


Restoring or loading a PostgreSQL database from a .BAK file using the Command Prompt (CMD) is a crucial skill for database administrators and developers. This tutorial provides a comprehensive, step-by-step guide to help you successfully restore your PostgreSQL database from backup files, ensuring your data is safely recovered and operational.

We start by explaining the importance of database backups, particularly the .BAK file format, which is commonly used for storing PostgreSQL backups. You'll learn how to navigate the Command Prompt and execute the necessary commands to load a backup file into your PostgreSQL database. The video covers the full process, from connecting to the PostgreSQL server via CMD to executing the restore command with the appropriate parameters.

Throughout the tutorial, we emphasize best practices for ensuring a smooth restoration process. This includes verifying the integrity of your backup files, selecting the correct database to restore into, and handling potential errors that may arise during the process. Additionally, we provide troubleshooting tips to resolve common issues, such as permission errors or conflicts with existing database objects.

Whether you're restoring a critical production database or just learning how to manage backups in PostgreSQL, this video will equip you with the knowledge and skills needed to perform database restorations efficiently using the Command Prompt.

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First, I am taking the backup as a .bak file

Enter the password for the Postgres user... for me its the root

The Command link is in the video description... Please subscribe
my channel to get updates...Thanks for watching

pg_restore -h localhost -d dvdrental -U postgres -p 5432 D:\dvdrental.bak

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Sunday, 12 June 2022

How To Schedule A Job Using pgAgent Jobs In PostgreSQL Database Using pg...


In this tutorial, we explore the powerful job scheduling capabilities of pgAgent within PostgreSQL, a crucial tool for automating routine tasks and maintaining database efficiency. PgAgent allows you to schedule jobs that can execute various database operations, such as backups, maintenance tasks, or running stored procedures, all within a specific time frame or on a recurring basis.

The video begins by guiding you through the installation and configuration of pgAgent within pgAdmin, ensuring that your environment is set up correctly to start automating tasks. We then delve into the core process of creating a new job, from defining the job steps to setting up the schedule that determines when and how often the job will run.

Throughout the tutorial, we provide practical examples of common tasks that can be automated using pgAgent Jobs, such as database backups and maintenance operations. You’ll also learn how to monitor and manage these jobs within pgAdmin, including how to check job logs for success or failure, and how to troubleshoot any issues that might arise.

Moreover, we discuss best practices for optimizing job schedules to ensure that they run efficiently without impacting database performance. This includes tips on setting appropriate execution times, handling job dependencies, and using job categories to organize your scheduled tasks.

By the end of this video, you will have a solid understanding of how to schedule and manage jobs using pgAgent in PostgreSQL, enabling you to automate critical database operations and improve overall productivity.

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first, lets create a table.

Now, I will schedule a job and insert record into the table through
scheduler

I scheduled it to run it from 9:05 PM, currently I am at 09:00 PM

It is 09:03 PM now, and 2 minutes remaining...
Let's check if there is any data or not.
There should be no record now.

Here we can see the records are inserted...

In the next video, I will show

How to perform some complex operations through a scheduled job 
in PostgreSQL

Subscribe my channel....

create table emp(id numeric, name character(30),salary numeric);

select * from emp;

How To Add/Install pgAgent Jobs In Existing PostgreSQL Database | PostgreSQL Tutorials | pgAgent Job

 

In this blog, I will provide the download link to pg_Agent for the PostgreSQL database. So that you can install it and schedule a job in PostgreSQL.

 


In this comprehensive tutorial, we dive into the process of adding and installing pgAgent Jobs in an existing PostgreSQL database, a vital tool for automating and scheduling routine database tasks. PgAgent is an extension for PostgreSQL that allows you to schedule jobs, such as running SQL scripts, performing backups, or conducting maintenance tasks, at specified intervals or times.

The video begins with a detailed walkthrough of installing pgAgent in an existing PostgreSQL setup, covering both Windows and Linux environments. We guide you through the necessary prerequisites, such as ensuring that your PostgreSQL instance is properly configured to support pgAgent and downloading the required packages.

Once the installation is complete, we move on to the configuration phase, where you'll learn how to set up pgAgent within pgAdmin, including creating the necessary database objects and setting up the pgAgent service. We provide clear instructions on how to verify that pgAgent is running correctly and how to troubleshoot any issues that may arise during the installation process.

Next, the tutorial explores how to create, manage, and schedule jobs using pgAgent. You'll learn how to define job steps, set up schedules, and monitor job execution. We also cover best practices for organizing and maintaining your pgAgent Jobs, ensuring that your automated tasks run smoothly and efficiently.

By the end of this video, you'll be equipped with the knowledge to effectively install and utilize pgAgent in your PostgreSQL environment, empowering you to automate various database operations and improve your overall workflow.

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How To Add/Install pgAgent Jobs In Existing PostgreSQL Database | Postgr...

 


Only 3.9% of viewers are subscribing to my channel 😓.
I request you to please give click on Subscribe button.
It really helps me grow 😢.


In this blog, I will provide the download link to pg_Agent for the PostgreSQL database. So that you can install it and schedule a job in PostgreSQL.

Download pgAgent Here

 

 

Sunday, 5 June 2022

How To Install pgAgent Jobs To Schedule A Job In PostgreSQL Database || ...


In this tutorial, we walk you through the complete process of installing pgAgent Jobs to enable job scheduling within a PostgreSQL database. PgAgent is an essential tool for database administrators and developers who want to automate routine tasks such as backups, maintenance, or custom SQL scripts, ensuring that these operations run smoothly without manual intervention.

The video begins with an introduction to pgAgent, highlighting its role in automating PostgreSQL database tasks. We then guide you through the installation process, including how to download and set up pgAgent on both Windows and Linux environments. You'll learn how to configure pgAgent within pgAdmin and ensure that the pgAgent service is properly installed and running.

After the installation, we focus on how to create and schedule jobs using pgAgent. This includes setting up job steps, defining schedules, and managing job execution. We also cover how to monitor your jobs, check for errors, and troubleshoot any issues that might arise during the setup.

Additionally, the video provides best practices for job scheduling to optimize performance and avoid potential conflicts or resource overloads. You'll gain insights into how to use pgAgent effectively to manage your PostgreSQL database operations more efficiently.

By the end of this tutorial, you’ll have the knowledge and skills to install and configure pgAgent in your PostgreSQL database, enabling you to automate a wide range of tasks and improve your database management workflow.

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Saturday, 4 June 2022

How To Describe Tables In PostgreSQL Using SQL Shell psql And pgAdmin ||...


In this PostgreSQL tutorial, we dive deep into the process of describing tables using both SQL Shell (psql) and pgAdmin, two essential tools for database management. Understanding how to describe tables is a fundamental skill for anyone working with PostgreSQL, as it allows you to explore the structure of your tables, including their columns, data types, and other relevant metadata.

The tutorial begins with a step-by-step guide on how to use SQL Shell (psql) commands to describe tables. We cover the basic commands that you can use to retrieve detailed information about table structures, such as the \d command and its variations. You'll learn how to extract valuable insights from your database directly from the command line, making it easier to manage and troubleshoot your PostgreSQL environment.

Next, we transition to pgAdmin, a popular graphical interface for PostgreSQL. Here, you'll discover how to navigate through the pgAdmin interface to find detailed descriptions of your tables. We demonstrate how to view table properties, explore column details, and understand constraints and indexes that are applied to your tables.

Throughout the video, we provide practical tips and best practices for using these tools effectively, helping you to streamline your workflow and enhance your database management capabilities. Whether you're preparing for a PostgreSQL certification, managing a production database, or simply expanding your knowledge, this tutorial will equip you with the skills needed to describe tables confidently in PostgreSQL.

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SELECT COLUMN_NAME  
FROM information_schema.COLUMNS  
WHERE TABLE_NAME = 'table_name';  

SELECT COLUMN_NAME
FROM information_schema.COLUMNS  
WHERE TABLE_NAME = 'actor'; 

SELECT *
FROM information_schema.COLUMNS  
WHERE TABLE_NAME = 'actor'; 

How To Show Tables In PostgreSQL Database Using SQL Shell psql And pgAdm...


In this tutorial, we'll walk you through the process of showing tables in a PostgreSQL database using two powerful tools: SQL Shell (psql) and pgAdmin. Whether you’re new to PostgreSQL or looking to refine your skills, knowing how to list and manage your tables is a fundamental aspect of database management.

We start with SQL Shell (psql), the command-line interface for PostgreSQL. You’ll learn how to use simple commands to list all the tables in your database, as well as more advanced techniques for filtering and viewing specific sets of tables. We’ll cover commands like \dt and others that give you quick and efficient access to your table listings.

After mastering the command-line approach, we switch to pgAdmin, the graphical interface that offers a more visual way to manage your PostgreSQL databases. Here, you’ll see how to navigate through your database structure, access your tables, and explore their contents. We provide a comprehensive guide to using pgAdmin’s interface to find and work with tables, making it easier to manage your data.

This tutorial is packed with practical tips to help you streamline your workflow and better understand the layout of your databases. Whether you’re managing a production environment or learning PostgreSQL for the first time, this guide will give you the tools you need to effectively show and manage your tables.

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How To Show Tables In PostgreSQL Database Using SQL Shell psql And pgAdmin || PostgreSQL Tutorials Syntax ------- SELECT * FROM pg_catalog.pg_tables WHERE schemaname = 'schema name' AND schemaname != 'information_schema' ; Query ------- SELECT * FROM pg_catalog.pg_tables WHERE schemaname = 'public' AND schemaname != 'information_schema' ; Syntax ------- select * from information_schema.tables where table_schema='schema name' and table_type = 'BASE TABLE OR VIEW'; Query ------- --Will display all tables select * from information_schema.tables where table_schema='public' and table_type = 'BASE TABLE'; --Will display all views select * from information_schema.tables where table_schema='public' and table_type = 'VIEW'; How To Show Tables In PostgreSQL Database Using SQL Shell psql And pgAdmin PostgreSQL Tutorials PostgreSQL Tutorials How To Show Tables In PostgreSQL Database Using SQL Shell psql And pgAdmin Show Tables In PostgreSQL Database Show Tables In PostgreSQL Database Using SQL Shell psql Show Tables In PostgreSQL Database Using pgAdmin Show Tables In PostgreSQL Database PostgreSQL Database Tables

How To Drop Table In PostgreSQL Using SQL Shell psql and pgAdmin || Post...


In this comprehensive PostgreSQL tutorial, we guide you through the process of dropping tables from your database using two essential tools: SQL Shell (psql) and pgAdmin. Dropping tables is a critical operation, and it’s important to do it correctly to avoid unintended data loss or disruption in your database.

We begin with SQL Shell (psql), the command-line interface that gives you precise control over your database operations. You’ll learn the exact commands needed to drop tables, along with options to ensure that you only remove the tables you intend to. We cover the DROP TABLE command, and discuss important flags like CASCADE and RESTRICT that help you manage dependencies within your database.

After exploring the command-line approach, we shift to pgAdmin, the graphical interface that many users find more intuitive. Here, you’ll see how to visually navigate through your database and easily drop tables through a few clicks. We walk you through the process step-by-step, ensuring that you understand each action and its consequences.

Throughout the tutorial, we provide best practices and tips for managing your PostgreSQL database effectively. Whether you’re managing a complex production environment or learning PostgreSQL for the first time, this video will equip you with the knowledge you need to safely and efficiently drop tables in your database.

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CREATE TABLE IF NOT EXISTS public.employees
(
    empid bigint NOT NULL,
    salary real NOT NULL DEFAULT 100,
    name character varying(50) COLLATE pg_catalog."default" NOT NULL,
    deptno bigint DEFAULT 1,
    gender character varying(15) COLLATE pg_catalog."default" DEFAULT 'Female'::character varying,
    CONSTRAINT emp_pk PRIMARY KEY (empid)
)

TABLESPACE pg_default;

ALTER TABLE IF EXISTS public.employees
    OWNER to postgres;

COMMENT ON TABLE public.employees
    IS 'This table will contain data for employees';
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How To Resolve/Fix The Application Has Lost The Database Connection in P...


Encountering the "The Application Has Lost The Database Connection" error in PostgreSQL can be frustrating, especially when it disrupts your workflow in pgAdmin. This video tutorial is designed to help you troubleshoot and resolve this common issue effectively.

In this tutorial, we begin by exploring the possible causes of the connection loss, such as network issues, server overloads, or incorrect configurations. Understanding these causes is crucial for implementing the right solution. We then dive into a step-by-step guide to troubleshoot and fix the issue.

We cover essential troubleshooting techniques, including checking your PostgreSQL server status, verifying network configurations, and reviewing pgAdmin settings. If you're dealing with server crashes or network disruptions, we provide practical tips to stabilize your connection and prevent future occurrences.

Additionally, we discuss preventive measures to maintain a stable PostgreSQL environment, ensuring that your database connections remain reliable. Whether you're a developer, DBA, or someone who frequently works with PostgreSQL, this tutorial equips you with the knowledge to handle database connection issues confidently.

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How To Resolve/Fix The Application Has Lost The Database Connection in PostgreSQL Database pgAdmin

1. Go to Services
2. Find PostgreSQL service and check the status
3. The service is stopped. It can be accidentally or forcefully done.
4. Now start the service.
5. Click on Continue, it will establish the connection again.
6. The service is running. The issue is fixed.

How To Resolve Or Fix Could Not Connect To Server Connection Refused In ...


The "Could Not Connect To Server: Connection Refused" error in PostgreSQL is a common but frustrating issue that can disrupt your work, especially when using pgAdmin. This video tutorial is designed to help you troubleshoot and resolve this problem effectively.

First, we explore the potential causes of this error. These may include incorrect server configurations, network issues, firewall settings, or PostgreSQL server not running. Understanding these causes is the first step in resolving the issue.

Next, we walk you through a detailed troubleshooting process. You'll learn how to check your PostgreSQL server status, verify your server configurations in pgAdmin, and ensure that the necessary services are running. We also cover how to review and adjust firewall settings that might be blocking your connection.

In addition to fixing the immediate problem, we provide tips on maintaining a stable PostgreSQL environment, ensuring that connection issues are less likely to occur in the future. Whether you're a database administrator, developer, or someone who regularly works with PostgreSQL, this video will equip you with the skills to handle server connection issues confidently.

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Thursday, 2 June 2022

How To Create Table In PostgreSQL Using pgAdmin And SQL Shell psql || Po...


Creating tables is one of the fundamental skills in PostgreSQL, essential for organizing and managing your data effectively. In this tutorial, we guide you through the process of creating a table using both the pgAdmin interface and the SQL Shell (psql) command-line tool, offering a comprehensive understanding of both methods.

We begin by exploring the graphical approach with pgAdmin, where you’ll learn to navigate through its intuitive interface to create a table. This method is particularly useful for those who prefer a visual approach or are new to PostgreSQL.

Next, we delve into the SQL Shell (psql), showing you how to write the necessary SQL commands to create a table. This section is crucial for those who wish to understand the underlying SQL syntax and gain confidence in using the command line.

Throughout the video, we emphasize best practices in table design, including choosing appropriate data types, setting primary keys, and ensuring your table structures align with your database’s requirements.

Whether you're a beginner looking to learn the basics or an experienced user aiming to refine your skills, this tutorial will equip you with the knowledge to create and manage tables effectively in PostgreSQL.

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-- Table: public.employees

-- DROP TABLE IF EXISTS public.employees;

CREATE TABLE IF NOT EXISTS public.employees
(
    empid bigint NOT NULL,
    salary real NOT NULL DEFAULT 100,
    name character varying(50) COLLATE pg_catalog."default" NOT NULL,
    deptno bigint DEFAULT 1,
    gender character varying(15) COLLATE pg_catalog."default" DEFAULT 'Female'::character varying,
    CONSTRAINT emp_pk PRIMARY KEY (empid)
)

TABLESPACE pg_default;

ALTER TABLE IF EXISTS public.employees
    OWNER to postgres;

COMMENT ON TABLE public.employees
    IS 'This table will contain data for employees';
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Wednesday, 1 June 2022

How To Resolve/Fix Error Database Is Being Accessed By Other Users Other...

How To Resolve/Fix Error Database Is Being Accessed By Other Users Other Session Using The Database



The "Database Is Being Accessed By Other Users/Other Session" error in PostgreSQL can be a significant obstacle, especially when you need to perform operations that require exclusive access. This video tutorial provides a clear and detailed approach to resolving this issue and getting your database operations back on track.

We start by exploring the common causes of this error, which often include active connections or transactions from other users or sessions that prevent exclusive access. Understanding these causes is crucial for implementing the right solutions.

The tutorial then walks you through step-by-step solutions, including how to identify active sessions and transactions that may be causing the issue. We show you how to use PostgreSQL tools and commands to manage these sessions and resolve conflicts.

Additionally, we provide tips on how to handle and prevent such errors in the future, including configuring appropriate isolation levels and managing session locks effectively.

Whether you're a database administrator, developer, or anyone working with PostgreSQL, this tutorial equips you with the knowledge to handle and fix database access issues efficiently.

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ERROR:  database "dvdrental" is being accessed by other users
DETAIL:  There is 1 other session using the database.

REVOKE CONNECT ON DATABASE dvdrental from public;  

SELECT pg_terminate_backend(pg_stat_activity.pid) 
FROM pg_stat_activity  
WHERE pg_stat_activity.datname = 'dvdrental';

drop database dvdrental;

How To Delete or Drop PostgreSQL Database Using pgAdmin And SQL Shell ps...


Deleting or dropping a PostgreSQL database is a crucial task when managing your database environment. Whether you need to clean up unused databases or start fresh, knowing how to do this safely is essential. In this tutorial, we demonstrate how to delete a PostgreSQL database using both pgAdmin and the SQL Shell (psql).

We begin with the graphical method using pgAdmin, where you'll learn to navigate the interface to drop a database efficiently. This approach is ideal for users who prefer a visual guide and easy access through pgAdmin’s features.

Next, we cover the SQL Shell (psql) method, showing you how to execute the SQL commands necessary to delete a database. This method is perfect for those who are comfortable with command-line tools and want to understand the underlying SQL syntax.

Throughout the video, we emphasize best practices and considerations before dropping a database, such as ensuring backups and checking for active connections. These steps are crucial to avoid accidental data loss and ensure a smooth operation.

Whether you're a seasoned database administrator or a developer managing PostgreSQL databases, this tutorial provides the knowledge you need to handle database deletion confidently.

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REVOKE CONNECT ON DATABASE dvdrental from public; SELECT pg_terminate_backend(pg_stat_activity.pid) FROM pg_stat_activity WHERE pg_stat_activity.datname = 'dvdrental'; drop database dvdrental; ERROR: database "dvdrental" is being accessed by other users DETAIL: There is 1 other session using the database.

How to Select Database In PostgreSQL Using pgAdmin and SQL Shell psql ||...


Selecting the right database in PostgreSQL is a fundamental skill for effective database management. Whether you're using pgAdmin or the SQL Shell (psql), this tutorial provides clear, step-by-step instructions on how to select and work with your databases.

We start by exploring the pgAdmin method, where you’ll learn how to use its graphical interface to select a database. This approach is user-friendly and ideal for those who prefer a visual tool for database management.

Next, we cover the SQL Shell (psql) approach, demonstrating how to use SQL commands to select a database. This method is perfect for users who are comfortable with the command-line interface and want to understand the SQL syntax for managing databases.

Throughout the video, we offer best practices for selecting and managing multiple databases, ensuring you can work efficiently and avoid common pitfalls.

Whether you’re a beginner or an experienced PostgreSQL user, this tutorial will enhance your database management skills and make database selection straightforward and effective.

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Sunday, 29 May 2022

How to Create Server And Database Using pgAdmin 4 || Postgresql Tips Tut...


Setting up a PostgreSQL environment involves creating a server and configuring databases to manage your data effectively. In this tutorial, we guide you through the process of creating a server and a database using pgAdmin 4, a powerful graphical interface for PostgreSQL.

We start with the basics of creating a new PostgreSQL server in pgAdmin 4, showing you how to configure server settings to connect to your PostgreSQL instance. This step is crucial for ensuring that pgAdmin can communicate with your PostgreSQL server.

Next, we demonstrate how to create a new database within the server. This process includes defining database settings and understanding the options available for managing your databases efficiently.

Throughout the video, we provide practical tips and best practices for setting up and managing your PostgreSQL environment. Whether you're setting up a new project or managing an existing one, these tips will help you streamline your database operations.

This tutorial is ideal for database administrators, developers, and anyone who needs to configure PostgreSQL databases using pgAdmin 4. Follow along to set up your PostgreSQL server and database with ease.

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password as root

-- Database: MyDatabase

-- DROP DATABASE IF EXISTS "MyDatabase";

CREATE DATABASE "MyDatabase"
    WITH
    OWNER = postgres
    ENCODING = 'UTF8'
    LC_COLLATE = 'English_United States.1252'
    LC_CTYPE = 'English_United States.1252'
    TABLESPACE = pg_default
    CONNECTION LIMIT = -1;

COMMENT ON DATABASE "MyDatabase"
    IS 'This Database is for demo';


-- Table: public.test

-- DROP TABLE IF EXISTS public.test;

CREATE TABLE IF NOT EXISTS public.test
(
    id integer NOT NULL,
    CONSTRAINT test_pkey PRIMARY KEY (id)
)

TABLESPACE pg_default;

ALTER TABLE IF EXISTS public.test
    OWNER to postgres;

COMMENT ON TABLE public.test
    IS 'For demo';
insert into test values (1);

select * from test;