Drop Down MenusCSS Drop Down MenuPure CSS Dropdown Menu

PostgreSQL BRIN index

- 
create table foo as select bar::integer from generate_series(1,1e5) bar; create index foo_btree on foo using btree(bar); create index foo_gist on foo using gist(bar); 
create index foo_brin on foo using brin(bar);

100000 rows affected

SELECT relname, pg_size_pretty(pg_relation_size(C.oid)) "size" FROM pg_class C LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace) WHERE nspname = current_schema ORDER BY pg_relation_size(C.oid) DESC;

relname         size
foo_gist 4392 kB
foo         3544 kB
foo_btree 2208 kB
foo_brin 24 kB

Comments

Post a Comment

Popular posts from this blog

PostgreSQL pgBadger

-
pgBadger is a PostgreSQL log analyzer built for speed with fully reports from your PostgreSQL log file. It's a single and small Perl script that outperforms any other PostgreSQL log analyzer.It is written in pure Perl and uses a JavaScript library (flotr2) to draw graphs so that you don't need to install any additional Perl modules or other packages. Furthermore, this library gives us more features such as zooming. pgBadger also uses the Bootstrap JavaScript library and the FontAwesome webfont for better design. Everything is embedded.pgBadger is able to autodetect your log file format (syslog, stderr or csvlog). It is designed to parse huge log files as well as gzip compressed files. See a complete list of features below. Supported compressed format are gzip, bzip2 and xz. For the xz format you must have an xz version upper than 5.05 that supports the --robot option.All charts are zoomable and can be saved as PNG images.You can also limit pgBadger to only report errors or rem…
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

How to configure Replication Manager (repmgr) ?

-
`repmgr` is a suite of open-source tools to manage replication and failover within a cluster of PostgreSQL servers. It enhances PostgreSQL's built-in replication capabilities with utilities to set up standby servers, monitor replication, and perform administrative tasks such as failover or switchover operations. The current `repmgr` version (3.3) supports all PostgreSQL versions from 9.3 to 9.6. Overview The repmgr suite provides two main tools:1.repmgr - a command-line tool used to perform administrative tasks such as: - setting up standby servers - promoting a standby server to master - switching over master and standby servers - displaying the status of servers in the replication cluster 2.repmgrd is a daemon which actively monitors servers in a replication cluster and performs the following tasks: - monitoring and recording replication performance - performing failover by detecting failure of the master and promoting the most suitabl…
Read more

Migrating From Oracle to PostgreSQL using ora2pg open source tools

-
In this blog we are going to talk about migrating from oracle to postgresql using ora2pg.
After installing ora2pg tool, we will see how to configure and to run it to migrate our data. We are using an oracle 12C database and a postgresql edb 9.6, The server is runing on OEL 7.2,The oracle database and the postgresql server are running on the same server.

we are going to talk about migrating from oracle to postgresql using ora2pg open source tool
before migrating you need to know little bit knowledge of functions,procedure,trigger and  Difference between oracle vs postgresql data types

1.Oracle Installation 12C
2.Oracle instalaltion 11gr2
3.postgresql installation 9.3
4.postgresql installation 10.3
-------------------------At Oracle---------------------------------------------------
PREREQUEST:
1.In a database all schema size:
set linesize 150 set pagesize 5000 col owner for a15 col segment_name for a30 col segment_type for a20 col TABLESPACE_NAME for a30 clear breaks clear computes compute sum of…
Read more

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_relation_size(…
Read more