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How to find the server is whether standby (slave) or primary(master) in Postgresql replication ?

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

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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
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7 Steps to configure BDR replication in postgresql

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 The  BDR  (Bi-Directional Replication) project adds multi-master replication to PostgreSQL 9.4.  Postgres-BDR has a lower impact on the masters(s) than trigger-based replication solutions. There is no write-amplification, as it does not require triggers to write to queue tables in order to replicate writes.   Here We are using  postgres version 9.4.12 and bdr version 1.0.2. for configuring  multi master replication . Simply Following 7 steps you can configure the multi master replication in postgresql. To download the bdr in below link. .   https://github.com/2ndQuadrant/bdr/archive/bdr-pg/REL9_4_12-1.tar.gz $ tar -xzvf REL9_4_12-1.tar.gz $ wget https://github.com/2ndQuadrant/bdr/archive/bdr-plugin/1.0.2.tar.gz $ tar -xzvf 1.0.2.tar.gz 1. To install BDR. $ cd ~/bdr-bdr-pg-REL9_4_12-1 $ ./configure --prefix=/usr/lib/postgresql/9.4 --enable-debug --with-openssl $ make -j4 -s install-world $ cd ~/bdr-bdr-plugin-1.0.2 $ PATH=/usr/lib/postgresql/9.4/bin:"$PATH" ./c
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Postgres Streaming Replication Configuration

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Primary - Existing Test Server: ======= Hostname: nijam-1 IP Address: 53.99.198.11 Secodary - New Test Server ======== Hostname: nijam-2 IP Address: 53.99.198.12 ===================================================== Step 1. stop the slave server /optt/10.5/bin/pg_ctl -D /DATA stop Step 2. move the slave data directory to backup location: mv /DATA/* /tmp/backup Step 3. change below parameter on master postgresql.conf & pg_hba.conf files . listen_addresses = 'localhost,53.99.198.11' wal_level = replica # minimal, replica, or logical archive_mode = on archive_command = 'cp %p /ARCHIVES/%f' max_wal_senders = 10 wal_keep_segments = 25 On pg_hba.conf: host replication postgres 53.99.198.12/24 trust host replication postgres 53.99.198.11/24 trust Step 4. Restart the master server: /optt/10.5/bin/pg_ctl -D /DATA restart Step 5. taking consistancy backup: psql -c "sele
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vacuumlo - removing large objects orphans from a database PostgreSQL

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