Background
The /data/01 disk space is insufficient,but /data/02 is sufficient,so we migrate some data to /data/02.
1.Backup DB and upload to s3
pg_dump --verbose -Fc --dbname=region_il | gzip > /data/02/backup/region_il_20180907.psql.gz
pg_dump --verbose -Fc --dbname=region_anz | gzip > /data/02/backup/region_anz_20180907.psql.gz
pg_dump --verbose -Fc --dbname=region_mea | gzip > /data/02/backup/region_mea_20180907.psql.gz
pg_dump --verbose -Fc --dbname=region_sa | gzip > /data/02/backup/region_sa_20180907.psql.gz
$ aws s3 cp region_il_20180907.psql.gz s3://dba-backups/
$ aws s3 cp region_anz_20180907.psql.gz s3://dba-backups/
$ aws s3 cp region_mea_20180907.psql.gz s3://dba-backups/
$ aws s3 cp region_sa_20180907.psql.gz s3://dba-backups/
$ aws s3 ls s3://dba-backups/ |grep "20180907.psql.gz"
2018-07-09 07:31:57 1831857418 region_anz_20180907.psql.gz
2018-07-09 07:33:57 1615345844 region_il_20180907.psql.gz
2018-07-09 07:37:05 8780321291 region_mea_20180907.psql.gz
2018-07-09 07:44:52 20429541766 region_sa_20180907.psql.gz
2.Check Session and disk freeable space
postgres=#select*frompg_stat_activity; datid|datname|pid|usesysid|usename|application_name|client_addr|client_hostname|client_port|backend_start|xact_start|query_start|state_change|waiting|state|query -------+----------+-------+----------+----------+------------------+-------------+-----------------+-------------+-------------------------------+-------------------------------+-------------------------------+-------------------------------+---------+--------+---------------------------------- 12840|postgres|23155|10|postgres|psql|||-1|2018-07-0907:38:34.935179-04|2018-07-0907:43:04.894374-04|2018-07-0907:43:04.894374-04|2018-07-0907:43:04.894378-04|f|active|select*frompg_stat_activity; 12840|postgres|22809|10|postgres|psql|||-1|2018-07-0907:34:45.688671-04||2018-07-0907:37:37.758388-04|2018-07-0907:37:37.758749-04|f|idle|selectoid,*frompg_tablespace; (2rows)
$ df -Th
Filesystem Type Size Used Avail Use% Mounted on
/dev/xvde1 ext3 9.9G 6.4G 3.0G 69% /
none tmpfs 15G 12K 15G 1% /dev/shm
/dev/xvdl1 ext4 493G 47G 421G 10% /data/02
/dev/xvdk1 ext4 2.0T 1.8T 113G 94% /data/01
3.Create new tablespace location /data/02 disk:
create tablespace region owner denaliadmin location '/data/02/pgsql/data/base';
postgres=# \db+
List of tablespaces
Name | Owner | Location | Access privileges | Description
------------+-------------+--------------------------+-------------------+-------------
pg_default | postgres | | |
pg_global | postgres | | |
region | denaliadmin | /data/02/pgsql/data/base | |
(3 rows)
4.Move DB to new Tablespace
postgres=#selectoid,*frompg_database; oid|datname|datdba|encoding|datcollate|datctype|datistemplate|datallowconn|datconnlimit|datlastsysoid|datfrozenxid|datminmxid|dattablespace|datacl --------+--------------------+--------+----------+-------------+-------------+---------------+--------------+--------------+---------------+--------------+------------+---------------+------------------------------------------------------------------- 1|template1|10|6|en_US.UTF-8|en_US.UTF-8|t|t|-1|12835|200001862|1|1663|{=c/postgres,postgres=CTc/postgres} 12835|template0|10|6|en_US.UTF-8|en_US.UTF-8|t|f|-1|12835|200001940|1|1663|{=c/postgres,postgres=CTc/postgres} 12840|postgres|10|6|en_US.UTF-8|en_US.UTF-8|f|t|-1|12835|295302735|1|1663| 16384|template_postgis|10|6|en_US.UTF-8|en_US.UTF-8|f|t|-1|12835|205319808|1|1663| 21627|denali_test|16513|6|en_US.UTF-8|en_US.UTF-8|f|t|-1|12835|205320018|1|1663| 17794|denali|10|6|en_US.UTF-8|en_US.UTF-8|f|t|-1|12835|205316770|1|1663|{=Tc/postgres,postgres=CTc/postgres,r_denali_readonly=c/postgres} 25419|contrib_regression|10|6|en_US.UTF-8|en_US.UTF-8|f|t|-1|12835|295302735|1|1663| 71746|regression|16513|6|en_US.UTF-8|en_US.UTF-8|f|t|-1|12835|187750513|1|1663| 103050|test|16513|6|en_US.UTF-8|en_US.UTF-8|f|t|-1|12835|200001862|1|1663| 48729|region_na|16513|6|en_US.UTF-8|en_US.UTF-8|f|t|-1|12835|190246393|1|1663| 153385|region_sea|16513|6|en_US.UTF-8|en_US.UTF-8|f|t|-1|12835|200001862|1|1663| 158397|fuse|16513|6|en_US.UTF-8|en_US.UTF-8|f|t|-1|12835|200001862|1|1663| 81870|region_eu|16513|6|en_US.UTF-8|en_US.UTF-8|f|t|-1|12835|192495454|1|1663| 93796|region_sa|16513|6|en_US.UTF-8|en_US.UTF-8|f|t|-1|12835|200778866|1|1663| ×××8|region_mea|16513|6|en_US.UTF-8|en_US.UTF-8|f|t|-1|12835|190246488|1|1663| 101209|region_il|16513|6|en_US.UTF-8|en_US.UTF-8|f|t|-1|12835|199337179|1|1663| 101862|region_anz|16513|6|en_US.UTF-8|en_US.UTF-8|f|t|-1|12835|199763417|1|1663| (17rows)
postgres=# select oid,* from pg_tablespace;
oid | spcname | spcowner | spcacl | spcoptions
--------+------------+----------+--------+------------
1663 | pg_default | 10 | |
1664 | pg_global | 10 | |
271240 | region | 16513 | |
(3 rows)
alter database region_il set tablespace region;
alter database region_anz set tablespace region;
alter database region_mea set tablespace region;
alter database region_sa set tablespace region;
postgres=#selectoid,*frompg_databasewheredatnamein('region_il','region_anz','region_mea','region_sa');
oid|datname|datdba|encoding|datcollate|datctype|datistemplate|datallowconn|datconnlimit|datlastsysoid|datfrozenxid|datminmxid|dattablespace|datacl
--------+------------+--------+----------+-------------+-------------+---------------+--------------+--------------+---------------+--------------+------------+---------------+--------
101209|region_il|16513|6|en_US.UTF-8|en_US.UTF-8|f|t|-1|12835|199337179|1|271240|
101862|region_anz|16513|6|en_US.UTF-8|en_US.UTF-8|f|t|-1|12835|199763417|1|271240|
×××8|region_mea|16513|6|en_US.UTF-8|en_US.UTF-8|f|t|-1|12835|190246488|1|271240|
93796|region_sa|16513|6|en_US.UTF-8|en_US.UTF-8|f|t|-1|12835|200778866|1|271240|
(4rows)
/dev/xvdl1 ext4 493G 332G 136G 71% /data/02
/dev/xvdk1 ext4 2.0T 1.5T 399G 79% /data/01
5.Restart Database
pg_ctl stop;
pg_ctl start;
6.Reference
https://www.postgresql.org/docs/9.3/static/sql-createtablespace.html
https://www.postgresql.org/docs/9.3/static/sql-alterdatabase.html
