Drop Down MenusCSS Drop Down MenuPure CSS Dropdown Menu

PostgreSQL Features

-
PostgreSQL supports a large part of the SQL standard and offers many modern features including the following:
1.SQL -structured query language
  • datatypes
  • language
  • constraints
  • operators
  • function
  • joins
  • subquery
  • views
  • synonym
  • sequence
2.PL/pgSQL - procedural postgre structured query language 
  • installing procedural language
  • structure of Pl/pgSQL
  • languages
  • cursors
  • exception
  • procedure
  • function
  • triggers 
3.architecture
  • fundamentals
4.installation
  • GUI mode
  • text mode
  • unattended mode
5.database
  • creating database
  • accessing a database
  • managing  roles,
  • managing schema, 
  • managing tablespace
  • fragmentaion
  • index
  • lock management
  • partition
  • job
6.backup and restore
  • dump
  • filesystem level backup
  • PITR
7.high availability
  • Warm Standby Replication (as of 8.3)
  • Streaming Replication (as of 9.0)
  • Hot Standby (as of 9.0) 
  • failover
  • Monitorin Standby
8.database activity
  • statistics collector
  • viewing locks
  • dynamic tracing
  • disk usage
  • disk full failure
  • write-ahead logging (WAL)
  • configuration
9.clinet interface
  • libpq -c library
  • large objects
  • ECPG -empedded sql in c
  • the information schema
10.Multiversion concurrency control (MVCC)

11.Postgresql Monitoring   

 12. Objects Max Sizes:
  • Maximum Database Size Unlimited
  • Maximum Table Size 32 TB
  • Maximum Row Size 1.6 TB
  • Maximum Field Size 1 GB
  • Maximum Rows per Table Unlimited
  • Maximum Columns per Table 250 – 1600 depending on column types
  • Maximum Indexes per Table Unlimited.

Comments

Post a Comment

Popular posts from this blog

How to Get Table Size, Database Size, Indexes Size, schema Size, Tablespace Size, column Size in PostgreSQL Database

-
In this post, I am sharing few important function for finding the size of database, table and index in PostgreSQL. Finding object size in postgresql database is very important and common. Is it very useful to know the exact size occupied by the object at the tablespace. The object size in the following scripts is in GB. The scripts have been formatted to work very easily with PUTTY SQL Editor. 1. Checking table size excluding table dependency: SELECT pg_size_pretty(pg_relation_size('mhrordhu_shk.mut_kharedi_audit')); pg_size_pretty ---------------- 238 MB (1 row) 2. Checking table size including table dependency: SELECT pg_size_pretty(pg_total_relation_size('mhrordhu_shk.mut_kharedi_audit')); pg_size_pretty ---------------- 268 MB (1 row) 3. Finding individual postgresql database size SELECT pg_size_pretty(pg_database_size('db_name')); 4. Finding individual table size for postgresql database -including dependency index: SELECT pg_size_pretty(pg_total_rel
Read more

PostgreSQL Database startup / shutdown /restart

-
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 By using Pg_ctl Utility Postgresl -9.3 Script 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/Postg
Read more

How to Enable/Disable autovacuum on PostgreSQL

-
Introduced in PostgreSQL 8.1, the AUTOVACUUM daemon is an optional feature that automatically vacuums the database so that you don't have to manually run the  VACUUM statement . The AUTOVACUUM daemon is enabled in the default configuration. The AUTOVACUUM daemon is made up of multiple processes that reclaim storage by removing obsolete data or tuples from the database. It checks for tables that have a significant number of inserted, updated, or deleted records and vacuums these tables based on the configuration settings below. Default Settings The AUTOVACUUM settings for PostgreSQL can be found in the  postgresql.conf  file and control when/how the daemon runs. The following is an example of these settings: #------------------------------------------------------------------------------ # AUTOVACUUM PARAMETERS #------------------------------------------------------------------------------ autovacuum = on # Enable autovacuum subprocess? 'on
Read more

ORA-01261: Parameter db_recovery_file_dest destination string cannot be translated ORA-01262: Stat failed on a file destination directory Linux-x86_64 Error: 2: No such file or directory

-
While I start my database with my initialization parameter it fails with oracle error Solution :- su oracle run environment variable sqlplus / as sysdba SQL>create pfile from spfile; Then remove or comment below line in pfile db_recovery_file_dest Save and exit su oracle run environment variable sqlplus / as sysdba SQL>startup mount; ORACLE instance started. Total System Global Area 1068937216 bytes Fixed Size 2166536 bytes Variable Size 427819256 bytes Database Buffers 624951296 bytes Redo Buffers 14000128 bytes it should became the mount stage then open the DB as follows SQL>alter database open; Database altered.
Read more

PostgreSQL Pgbadger Installation On Linux

-
Image
PgBadger is a tool that analyzes PostgreSQL log files and generates reports on execution of SQL and server operation. Statistical reports analyzed from a number of perspectives can be useful not only for grasping the usual database operation but also as a hint for performance improvement. The report output by pgBadger has the following features. Graph output in HTML format Many statistical objects Daily, Weekly unit creation possible 1.Graph output in HTML format Many of the analysis results can be displayed in graph form by outputting the report in HTML format (output in text format or JSON format is also possible). By analyzing the log information graphed, it is much more prospective for people to see than the raw log data. So, if you do not need to handle it with another tool separately, we recommend report output in HTML format. 2.Many statistical objects A lot of data useful for database performance analysis is output in the report as shown below. Qu
Read more