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)