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      • Moving Database objects or all tables to a different tablespace in PostgreSQL

      Moving Database objects or all tables to a different tablespace in PostgreSQL

      • Posted by Nijamutheen J
      • Categories Blog
      • Date January 16, 2019
      • Comments 0 comment

      Create a directory

      mkdir /home/Postdata/pg_data
      sudo chown postgres:postgres /home/Postdata/pg_data
      psql -d crsp -c "CREATE TABLESPACE tab1 OWNER u1 LOCATION '/home/Postdata/pg_data'";

      If I wanted to move my database into this new tablespace:

      psql -d postgres -c "ALTER DATABASE db1 SET TABLESPACE tab1";

      But if I just want to move the stuff I use and manage:

      SELECT ' ALTER TABLE '||schemaname||'.'||tablename||' SET TABLESPACE tab1;'
      FROM pg_tables WHERE schemaname NOT IN ('pg_catalog', 'information_schema');

      and saved it as tab1.sql

      I then ran the following on the command line:

      psql -d db1 < tab1.sql | grep ALTER | psql -d db1

      This uses SQL to create new SQL, then filters the relevant lines (these have the word “ALTER” in them), then pass these to psql.

      Note: Downtime is required for alter table moving. For “online” moving one can though use tools like pg_repack or pg_squeeze,Affected tables are locked while being relocated

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      Nijamutheen J

      Nijamutheen J 7+ years of experience in PostgreSQL, Linux admin , web hosting - apache server , Oracle ,mySQL, Mriadb, vertica DB & Server security administrator

      My updated resume is https://www.tutorialdba.com/p/hi-i-have-4.html

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