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      Databases

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      CoursesIT & SoftwareDatabasesPostgreSQL Database
      • BASIC POSTGRESQL
        6
        • Lecture1.1
          PostgreSQL Brief History 30 min
        • Lecture1.2
          PostgreSQL Features 20 min
        • Lecture1.3
          PostgreSQL Monitoring Tools Overview 30 min
        • Lecture1.4
          PostgreSQL – Oracle Vs PostgreSQL 30 min
        • Lecture1.5
          PostgreSQL Data Types 30 min
        • Lecture1.6
          PostgreSQL Maximum Objects Size 30 min
      • VMWARE & POSTGRESQL INSTALLATION
        9
        • Lecture2.1
          Vmware Installation 30 min
        • Lecture2.2
          Creating Linux Virtual Machine 01 hour
        • Lecture2.3
          PostgreSQL Installation Types 30 min
        • Lecture2.4
          PostgreSQL GUI Installation 30 min
        • Lecture2.5
          PostgreSQL Text Mode Installation 30 min
        • Lecture2.6
          PostgreSQL Unattended Mode Installation 30 min
        • Lecture2.7
          Configure the network & Disk Partition 30 min
        • Lecture2.8
          How to install PostgreSQL10 On Linux Server ? 20 min
        • Lecture2.9
          PostgreSQL -11 Installation (rpm & source code) 30 min
      • POSTGRESQL DATABASE
        6
        • Lecture3.1
          Connect Postgres Server 10 min
        • Lecture3.2
          PostgreSQL startup / shutdown /restart the postgresql server 30 min
        • Lecture3.3
          PostgreSQL .bash_profile Set Up 30 min
        • Lecture3.4
          PostgreSQL Database Creation 30 min
        • Lecture3.5
          PostgreSQL Connect Database 30 min
        • Lecture3.6
          PostgreSQL Drop Database 30 min
      • POSTGRESQL TABLE
        16
        • Lecture4.1
          PostgreSQL Languages 30 min
        • Lecture4.2
          PostgreSQL Create Table 30 min
        • Lecture4.3
          PostgreSQL Select Table 30 min
        • Lecture4.4
          PostgreSQL Alter Table 30 min
        • Lecture4.5
          PostgreSQL Drop Table 30 min
        • Lecture4.6
          PostgreSQL Truncate Table 30 min
        • Lecture4.7
          PostgreSQL Rename 30 min
        • Lecture4.8
          PostgreSQL Comment 30 min
        • Lecture4.9
          PostgreSQL Insert 30 min
        • Lecture4.10
          PostgreSQL Update 30 min
        • Lecture4.11
          PostgreSQL Table Delete 30 min
        • Lecture4.12
          PostgreSQL Merge Table 30 min
        • Lecture4.13
          PostgreSQL UNION 30 min
        • Lecture4.14
          PostgreSQL UNION ALL 30 min
        • Lecture4.15
          PostgreSQL INTERSECT 30 min
        • Lecture4.16
          PostgreSQL DISTINCT 30 min
      • USER/OBJECTS PRIVILEGE AND ROLES ASIGNING
        3
        • Lecture5.1
          PostgreSQL Grant 30 min
        • Lecture5.2
          PostgreSQL Revoke 30 min
        • Lecture5.3
          Postgres user creation and restrict DDL statement & other database access 30 min
      • TRANSACTIONS - MVCC
        3
        • Lecture6.1
          PostgreSQL Commit 30 min
        • Lecture6.2
          PostgreSQL Rollback 30 min
        • Lecture6.3
          PostgreSQL Savepoint 30 min
      • POSTGRESQL USER/SCHEMA MANAGEMENT
        9
        • Lecture7.1
          PostgreSQL User Creation 30 min
        • Lecture7.2
          PostgreSQL User Creation Using Utility 30 min
        • Lecture7.3
          PostgreSQL Drop user 30 min
        • Lecture7.4
          PostgreSQL Drop User Using Utility 30 min
        • Lecture7.5
          PostgreSQL Password Changing and Views 30 min
        • Lecture7.6
          PostgreSQL Group/role 30 min
        • Lecture7.7
          Alter PostgreSQL User/Role/group 30 min
        • Lecture7.8
          PostgreSQL Schema 30 min
        • Lecture7.9
          PostgreSQL user creation and restrict DDL & database access 30 min
      • POSTGRESQL CONSTRAINTS
        6
        • Lecture8.1
          PostgreSQL Constraints 30 min
        • Lecture8.2
          PostgreSQL Primary Key 30 min
        • Lecture8.3
          PostgreSQL UNIQUE Constraint 30 min
        • Lecture8.4
          PostgreSQL CHECK Constraint 30 min
        • Lecture8.5
          PostgreSQL NOT NULL Constraint 30 min
        • Lecture8.6
          PostgreSQL Foreign Key 30 min
      • POSTGRESQL ADVANCE DATA TYPE
        5
        • Lecture9.1
          PostgreSQL DOMAIN Data Type 30 min
        • Lecture9.2
          PostgreSQL Alter Domain 30 min
        • Lecture9.3
          PostgreSQL Drop DOMAIN 30 min
        • Lecture9.4
          PostgreSQL Json Data Type 30 min
        • Lecture9.5
          PostgreSQL Sequence 30 min
      • POSTGRESQL VIEWS
        1
        • Lecture10.1
          How to Create PostgreSQL View 30 min
      • POSTGRESQL MONITORING OBJECT USUAGE/SIZE
        1
        • Lecture11.1
          How to Get Table Size, Database Size, Indexes Size, schema Size, Tablespace Size, column Size in PostgreSQL Database 30 min
      • POSTGRESQL DATABASE ARCHITECTURE
        4
        • Lecture12.1
          PostgreSQL Tablespace 30 min
        • Lecture12.2
          PostgreSQL UnderStanding Of Objects 30 min
        • Lecture12.3
          PostgreSQL Architecture 30 min
        • Lecture12.4
          PostgreSQL Query Flow 30 min
      • POSTGRESQL BACKUP AND RECOVERY
        13
        • Lecture13.1
          PostgreSQL Backup & Recovery Overview 30 min
        • Lecture13.2
          PostgreSQL Database Backup Tools – Pg_dump 30 min
        • Lecture13.3
          PostgreSQL Database Backup Tools – Pg_dumpall 30 min
        • Lecture13.4
          PostgreSQL Database Backup Tools – Pg_basebackup 30 min
        • Lecture13.5
          PostgreSQL COPY data From Text File 30 min
        • Lecture13.6
          PostgreSQL COPY data to Text File 30 min
        • Lecture13.7
          PostgreSQL Clone Table 20 min
        • Lecture13.8
          Postgres Database Schema Migration 30 min
        • Lecture13.9
          PostgreSQL Database clone/migration 30 min
        • Lecture13.10
          PostgreSQL Compress backup format 30 min
        • Lecture13.11
          PostgreSQL Archivelog 30 min
        • Lecture13.12
          PostgreSQL Point In Time Recovery 30 min
        • Lecture13.13
          Taking Backup On Postgres Slave (Standby) Server 30 min
      • POSTGRESQL PERFORMANCE TUNING
        5
        • Lecture14.1
          PostgreSQL Index 30 min
        • Lecture14.2
          PostgreSQL Reindex 30 min
        • Lecture14.3
          PostgreSQL PerformanceTuning 30 min
        • Lecture14.4
          Understanding Postgres VACUUM | VACUUM FULL | VACUUM ANALYZE 30 min
        • Lecture14.5
          Postgres Autovacuum Configuration/Setup 30 min
      • HIGH AVAILABILITY, LOAD BALANCING, AND REPLICATION
        11
        • Lecture15.1
          POSTGRESQL STREAMING REPLICATION 30 min
        • Lecture15.2
          SSL Streaming replication with PostgreSQL 10 30 min
        • Lecture15.3
          How to make Linux partition and configure the network on Redhat Linux7.3 30 min
        • Lecture15.4
          How To Fix Firewall Issues while connecting the other server? 30 min
        • Lecture15.5
          How to install the PostgreSQL10 On Linux ? 30 min
        • Lecture15.6
          How to Configure the cascade replication On PostgreSQL 10.3 ? 30 min
        • Lecture15.7
          How to add extra one slave an existing PostgreSQL cascade replication without down time ? 30 min
        • Lecture15.8
          PostgreSQL Switchover 30 min
        • Lecture15.9
          Postgres Failover 30 min
        • Lecture15.10
          Postgres Upgrade 30 min
        • Lecture15.11
          PostgreSQL Upgrade 9.5 to 11.3 . 30 min

        PostgreSQL startup / shutdown /restart the postgresql server

        • Pg_ctl Utility & Postgresql Service to do the same thing: Start the postgres server in the background. Without PGDATA set, “pg_ctl start” needs needs the additional -D /datadir argument in order to start.
        • you can start/stop the postgresql server as root user as well as postgres user

        root user:

        •  “service postgresql start“
        • “/etc/init.d/postgresql  start“, or “systemctl start postgresql-10” – this is for redhat linux above version 6

        postgres or edb user:

        Pg_ctl is only applicable for postgres user or edb user if you are a Enterprisedb

        • su – postgres

        ./pg_ctl start  -D /opt/PostgreSQL/9.3/data

        By using following anyone methods you can start,stop,reload else restart the postgresql server

        1. By using Pg_ctl Utility
        2. Postgresl -9.3 Script
        3. By using Postgresql Service

        1. pg_ctl utility – as postgres user:
        using pg_ctl you can start/stop/reload/restart the postgresql server this utility can only permitted to access as postgres user

        ./pg_ctl stop -D /opt/PostgresPlus/9.3AS/data/
        ./pg_ctl start -D /opt/PostgresPlus/9.3AS/data/
        ./pg_ctl reload -D /opt/PostgresPlus/9.3AS/data/
        ./pg_ctl status -D /opt/PostgresPlus/9.3AS/data/

        Starting the Server:

        $ pg_ctl start -D /data_directory_path/

        To stop the server, waiting until the server is accepting connections:

        $ pg_ctl -w stop -D /data_directory_path/

        To start the server using port 5433, and running without fsync, use:

        $ pg_ctl -o "-F -p 5432" start -D /data_directory_path/
        
        [postgres@r1 bin]$ ./pg_ctl start -m fast -D /opt/PostgreSQL/9.3/data
        server starting
        [postgres@r1 bin]$ 2017-01-25 17:06:07 EST LOG:  redirecting log output to logging collector process
        2017-01-25 17:06:07 EST HINT:  Future log output will appear in directory "pg_log".

        Stopping the Server:
        To stop the server, use

        $ pg_ctl stop -D /data_directory_path/

        The -m option allows control over how the server shuts down its like a oracle force shutdown it will not wait for untill session disconnect

        [postgres@r1 bin]$ ./pg_ctl stop -m fast -D /opt/PostgreSQL/9.3/data
        waiting for server to shut down... done
        server stopped

        Restarting the Server:
        Restarting the server is almost equivalent to stopping the server and starting it again, except that pg_ctl saves and reuses the command line options that were passed to the previously running instance. To restart the server in the simplest form, use

        $ pg_ctl restart -D /data_directory_path/

        To restart the server, waiting for it to shut down and restart

        [postgres@r1 bin]$  ./pg_ctl -w restart -D /opt/PostgreSQL/9.3/data
        waiting for server to shut down... done
        server stopped
        2017-01-25 17:03:54 EST LOG:  redirecting log output to logging collector process
        2017-01-25 17:03:54 EST HINT:  Future log output will appear in directory "pg_log".
        waiting for server to start.... done
        server started

        To restart using port 5433, disabling fsync upon restart

        [postgres@r1 bin]$  ./pg_ctl -o "-F -p 5432" restart -D /opt/PostgreSQL/9.3/data
        waiting for server to shut down.... done
        server stopped
        2017-01-25 17:01:41 EST LOG:  redirecting log output to logging collector process
        2017-01-25 17:01:41 EST HINT:  Future log output will appear in directory "pg_log".
        server starting

        checking postgresql Server status:
        you can check the postgresql server status whether stopped or started using following command

        [postgres@r1 bin]$ ./pg_ctl status
        pg_ctl: no database directory specified and environment variable PGDATA unset
        Try "pg_ctl --help" for more information.

        Solution:

        [postgres@r1 bin]$  ./pg_ctl status -D /opt/PostgreSQL/9.3/data
        pg_ctl: server is running (PID: 5188)
        /opt/PostgreSQL/9.3/bin/postgres "-D" "/opt/PostgreSQL/9.3/data"

        2. postgresql server stop/start/reload/status – as root user

        /etc/init.d/postgresql-9.3 start
        /etc/init.d/postgresql-9.3 stop
        /etc/init.d/postgresql-9.3 restart
        /etc/init.d/postgresql-9.3 reload
        /etc/init.d/postgresql-9.3 status

        Examples /etc/init.d/postgres:
        Here i am trying to start the postgres server as a postgres  user using  “/etc/init.d/postgres” command you will get permission denied error and it  will work only as a root user

        [postgres@r1 bin]$ /etc/init.d/postgresql-9.3 start
        Starting PostgreSQL 9.3: 
        Password: 
        waiting for server to start.... done
        server started
        touch: cannot touch `/var/lock/subsys/postgresql-9.3': Permission denied
        PostgreSQL 9.3 started successfully

        starting server as root user:

        [root@r1 ~]# /etc/init.d/postgresql-9.3 start
        Starting PostgreSQL 9.3: 
        waiting for server to start.... done
        server started
        PostgreSQL 9.3 started successfully

        3. By using Postgresql service – as root user:
        you can start/stop/reload/restart the postgresql server using postgresql service ,it will work only on root user path not good for postgres user as defaulty. before accessing you have to setup the service

        Set Up “service postgresql”on RedHat Linux

        Examples :

        Service postgresql start
        Service postgresql stop
        Service postgresql restart
        Service postgresql status

        Prev Connect Postgres Server
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