How to relocate tablespace directory

Posted 2020-06-14

I’ll demonstrate how to relocate a tablespace directory without the reconstruction of databases.

I have a tablespace tblspc located at /home/postgres/tblspc and want to relocate to /home/postgres/new_tblspc.

 

[1] Get Oid of the tablespace

testdb=# SELECT oid,spcname FROM pg_tablespace WHERE spcname = ‘tblspc‘; 
   oid | spcname 

 -------+---------- 

 24580 | tblspc 
(1 row)

[2] Stop postgres

[postgres]$ pg_ctl -D $PGDATA stop

[3] Relocate the tablespace directory

[postgres]$ cp -r /home/postgres/tblspc /home/postgres/new_tblspc 
[postgres]$ rm -rf /home/postgres/tblspc

[4] Change the link of tablespace to new directory

[postgres]$ cd $PGDATA/pg_tblspc 
[postgres]$ rm 24580 
[postgres]$ ln -s /home/postgres/new_tblspc 24580

[5] Start postgres

[postgres]$ pg_ctl -D $PGDATA start

Then, the tablespace’s directory has changed.

testdb=# SELECT pg_tablespace_location(24580);
 pg_tablespace_location 

-------------------------- 

/home/postgres/new_tblspc 
(1 row)

 

参考：

http://www.interdb.jp/blog/tips/relocatingtablespace/