目前开发一台EC2的PostgreSQL服务器的磁盘空间已经严重不足，该磁盘非LVM，所以不考虑磁盘扩容方法，研发希望可以分区/data/02对应的/dev/xvdl1磁盘分担部分数据库的数据，这样也不用另加磁盘，这里研发列出了部分数据库。此处借用tablespace特性将部分数据迁移到新磁盘
[postgres@ec2s-autodenalicontentpoi-01 ~]$ df -h Filesystem Size Used Avail Use% Mounted on /dev/xvde1 9.9G 6.3G 3.2G 67% / none 15G 12K 15G 1% /dev/shm /dev/xvdl1 493G 46G 422G 10% /data/02 /dev/xvdk1 2.0T 1.8T 113G 94% /data/01 hq-nfs-01.eng.telenav.com:/nfs_home/home/ 985G 22G 964G 3% /nfs/home
查看当前所有数据库大小
postgres=# l+ List of databases Name | Owner | Encoding | Collate | Ctype | Access privileges | Size | Tablespace | Description --------------------+-------------+----------+-------------+-------------+------------------------------+--------+------------+-------------------------------------------- contrib_regression | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | | 15 MB | pg_default | denali | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =Tc/postgres +| 357 MB | pg_default | | | | | | postgres=CTc/postgres +| | | | | | | | r_denali_readonly=c/postgres | | | denali_test | denaliadmin | UTF8 | en_US.UTF-8 | en_US.UTF-8 | | 15 MB | pg_default | fuse | denaliadmin | UTF8 | en_US.UTF-8 | en_US.UTF-8 | | 15 MB | pg_default | postgres | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | | 27 MB | pg_default | default administrative connection database region_anz | denaliadmin | UTF8 | en_US.UTF-8 | en_US.UTF-8 | | 17 GB | pg_default | region_eu | denaliadmin | UTF8 | en_US.UTF-8 | en_US.UTF-8 | | 447 GB | pg_default | region_il | denaliadmin | UTF8 | en_US.UTF-8 | en_US.UTF-8 | | 12 GB | pg_default | region_mea | denaliadmin | UTF8 | en_US.UTF-8 | en_US.UTF-8 | | 69 GB | pg_default | region_na | denaliadmin | UTF8 | en_US.UTF-8 | en_US.UTF-8 | | 603 GB | pg_default | region_sa | denaliadmin | UTF8 | en_US.UTF-8 | en_US.UTF-8 | | 188 GB | pg_default | region_sea | denaliadmin | UTF8 | en_US.UTF-8 | en_US.UTF-8 | | 62 GB | pg_default | regression | denaliadmin | UTF8 | en_US.UTF-8 | en_US.UTF-8 | | 91 GB | pg_default | template0 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgres +| 14 MB | pg_default | unmodifiable empty database | | | | | postgres=CTc/postgres | | | template1 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgres +| 14 MB | pg_default | default template for new databases | | | | | postgres=CTc/postgres | | | template_postgis | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | | 19 MB | pg_default | test | denaliadmin | UTF8 | en_US.UTF-8 | en_US.UTF-8 | | 14 MB | pg_default | (17 rows)
创建新的表空间
[postgres@ec2s-autodenalicontentpoi-01]$ mkdir -p /data/02/pgsql/data/base postgres=# 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) postgres=# select oid, * from pg_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 | 99928 | 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 | (17 rows) postgres=# select oid,* from pg_tablespace; oid | spcname | spcowner | spcacl | spcoptions --------+------------+----------+--------+------------ 1663 | pg_default | 10 | | 1664 | pg_global | 10 | | 271240 | region | 16513 | | (3 rows)
将部分数据库迁移到新的表空间
postgres=# alter database region_il set tablespace region; postgres=# alter database region_anz set tablespace region; postgres=# alter database region_mea set tablespace region; postgres=# alter database region_sa set tablespace region; postgres=# select d.datname as database, t.spcname as tablespace from pg_database d, pg_tablespace t where d.dattablespace=t.oid; database | tablespace --------------------+------------ template1 | pg_default template0 | pg_default postgres | pg_default template_postgis | pg_default denali_test | pg_default denali | pg_default contrib_regression | pg_default regression | pg_default test | pg_default region_na | pg_default region_sea | pg_default region_il | region region_anz | region region_mea | region region_sa | region fuse | pg_default region_eu | pg_default (17 rows)