cd /usr/lib/postgresql/9.3/bin
./oid2name --help
oid2name helps examining the file structure used by PostgreSQL.
Usage:
oid2name [OPTION]...
Options:
-d DBNAME database to connect to
-f FILENODE show info for table with given file node
-H HOSTNAME database server host or socket directory
-i show indexes and sequences too
-o OID show info for table with given OID
-p PORT database server port number
-q quiet (don't show headers)
-s show all tablespaces
-S show system objects too
-t TABLE show info for named table
-U NAME connect as specified database user
-V, --version output version information, then exit
-x extended (show additional columns)
-?, --help show this help, then exit
The default action is to show all database OIDs.
使用
列出所有庫
postgres@db1:/usr/lib/postgresql/9.3/bin$ ./oid2name
All databases:
Oid Database Name Tablespace
---------------------------------------
16387 a pg_default
16388 b pg_default
16389 c pg_default
16477 d pg_default
32700 empty-next-release pg_default
12042 postgres pg_default
12037 template0 pg_default
1 template1 pg_default
列出所有表空間
postgres@db1:/usr/lib/postgresql/9.3/bin$ ./oid2name -s
All tablespaces:
Oid Tablespace Name
-----------------------
1663 pg_default
1664 pg_global
進入數據目錄
cd /var/lib/postgresql/9.3/main/base/12037
postgres@db1:~/9.3/main/base/12037$ ls -ltr | tail -n 8
-rw------- 1 postgres postgres 16384 Oct 31 15:28 11904
-rw------- 1 postgres postgres 24576 Oct 31 15:28 11886_fsm
-rw------- 1 postgres postgres 8192 Oct 31 15:28 11879
-rw------- 1 postgres postgres 0 Oct 31 15:28 11861
-rw------- 1 postgres postgres 8192 Oct 31 15:28 11857_vm
-rw------- 1 postgres postgres 8192 Oct 31 15:28 11827
-rw------- 1 postgres postgres 516096 Oct 31 15:28 11797
-rw------- 1 postgres postgres 8192 Oct 31 15:28 11791
查看11791的文件是什麼
postgres@db1:~/9.3/main/base/12037$ cd -
/usr/lib/postgresql/9.3/bin
postgres@db1:/usr/lib/postgresql/9.3/bin$ ./oid2name -d a -f 11791
From database "a":
Filenode Table Name
-------------------------------------
11791 pg_user_mapping_oid_index
顯示更多的信息
postgres@db1:/usr/lib/postgresql/9.3/bin$ ./oid2name -d a -f 11791 -x
From database "a":
Filenode Table Name Oid Schema Tablespace
------------------------------------------------------------------
11791 pg_user_mapping_oid_index 174 pg_catalog pg_default
根據 oid 查對錶信息
postgres@db1:/usr/lib/postgresql/9.3/bin$ psql -d a -c "select oid,relname from pg_class where relname='pg_user_mapping_oid_index'"
oid | relname
-----+---------------------------
174 | pg_user_mapping_oid_index
(1 row)
postgres@db1:/usr/lib/postgresql/9.3/bin$ ./oid2name -d a -o 174
From database "a":
Filenode Table Name
-------------------------------------
11791 pg_user_mapping_oid_index