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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

        Connect Postgres Server

        • A database is a named collection of SQL objects (“database objects LIKE tables, functions,etc”) that belongs to only one database.
        • But there are a few system catalogs eg – pg_database, which belong to a whole cluster and are accessible from each database within the cluster.

        Accurately, a database is a collection of schemas
        Schemas contain the tables, functions, etc…
        hierarchy is Server, database, schema, table

        • a client must specify its connection request and the name of the database it wants to connect to. It is not possible to access more than one database per connection.
        • But an application is not restricted in the number of connections it opens to the same or other databases.
        • Databases arc physically separated and access control is managed at the connection level. If one PostgreSQL server instance is to house projects or users that should be separate and for the most part unaware of each other,
        • it is therefore recommendable to put them into separate databases.
        • If the projects or users are interraelated and hould be able to use each others resources they should be put in the same database, but possibly into separate schemas.
        • Schemas is logical structure for who can access what is managed by the privilege system.

        Check whether postgres server is running or not:

        [postgres@r1 bin]$ ps -ef|grep post
        root      5073  4719  0 14:24 pts/1    00:00:00 su - postgres
        postgres  5074  5073  0 14:24 pts/1    00:00:00 -bash
        root      5149  4996  0 14:27 pts/2    00:00:00 su - postgres
        postgres  5150  5149  0 14:27 pts/2    00:00:00 -bash
        postgres  5188     1  0 14:28 pts/2    00:00:00 /opt/PostgreSQL/9.3/bin/postgres -D /opt/PostgreSQL/9.3/data
        postgres  5189  5188  0 14:28 ?        00:00:00 postgres: logger process                                    
        postgres  5191  5188  0 14:28 ?        00:00:00 postgres: checkpointer process                              
        postgres  5192  5188  0 14:28 ?        00:00:00 postgres: writer process                                    
        postgres  5193  5188  0 14:28 ?        00:00:00 postgres: wal writer process                                
        postgres  5194  5188  0 14:28 ?        00:00:00 postgres: autovacuum launcher process                       
        postgres  5195  5188  0 14:28 ?        00:00:00 postgres: stats collector process                           
        postgres  5215  5074  0 14:29 pts/1    00:00:00 ps -ef
        postgres  5216  5074  0 14:29 pts/1    00:00:00 grep post
        Connect The Postgres Server:
        [root@r1 data]# su - postgres  
        
        [postgres@r1 bin]$ ./psql -p 5432 -U postgres -d postgres
        Password for user postgres: 
        psql.bin (9.3.14)
        Type "help" for help.
        
        No entry for terminal type "xterm";
        using dumb terminal settings.
        postgres=#
        Conform to connect the right port:
        postgres=# select inet_server_port();
         inet_server_port
        ------------------
        5432
        (1 row)

        Conform to connected database:

        postgres=# select current_database();
         current_database 
        ------------------
         postgres
        (1 row)
        Conform to connect the right user:
        postgres=# select current_user;
         current_user 
        --------------
         postgres
        (1 row)
        Conform to connected ip address:
        postgres=# select inet_server_addr();
         inet_server_addr
        ------------------
        192.168.1.112
        (1 row)

        Check what Postgresql version you are using:

        postgres=# select version();
                               version                        
         ---------------------------------------------------------------------------------------------------------
         PostgreSQL 9.3.14 on i686-pc-linux-gnu, compiled by gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-52), 32-bit
        (1 row)

        Prev PostgreSQL -11 Installation (rpm & source code)
        Next PostgreSQL startup / shutdown /restart the postgresql server

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