global目錄
目錄位置一般爲$PGDATA/global，是存放共享系統表的位置，文件種類也類似base目錄。大多數系統目錄都是在數據庫創建的過程中從模版數據庫中拷貝過來的， 因此都是數據庫相關的。少數目錄在物理上是在一個集簇的所有數據庫間中共享的，這些將在每一個目錄單獨的描述中介紹。
系統表詳情
查看系統表
#查看testdb系統表
testdb=# select oid,relname,pg_relation_filepath(oid) from pg_class where relfilenode=0 order by 1;
oid | relname | pg_relation_filepath
------+-----------------------------------------+----------------------
1136 | pg_pltemplate | global/1136
1137 | pg_pltemplate_name_index | global/1137
1213 | pg_tablespace | global/1213
1214 | pg_shdepend | global/1214
1232 | pg_shdepend_depender_index | global/1232
1233 | pg_shdepend_reference_index | global/1233
1247 | pg_type | base/16384/1247
1249 | pg_attribute | base/16384/1249
1255 | pg_proc | base/16384/1255
1259 | pg_class | base/16384/1259
1260 | pg_authid | global/1260
1261 | pg_auth_members | global/1261
1262 | pg_database | global/1262
2396 | pg_shdescription | global/2396
2397 | pg_shdescription_o_c_index | global/2397
2658 | pg_attribute_relid_attnam_index | base/16384/2658
2659 | pg_attribute_relid_attnum_index | base/16384/2659
2662 | pg_class_oid_index | base/16384/2662
2663 | pg_class_relname_nsp_index | base/16384/2663
2671 | pg_database_datname_index | global/2671
2672 | pg_database_oid_index | global/2672
2676 | pg_authid_rolname_index | global/2676
2677 | pg_authid_oid_index | global/2677
2690 | pg_proc_oid_index | base/16384/2690
2691 | pg_proc_proname_args_nsp_index | base/16384/2691
2694 | pg_auth_members_role_member_index | global/2694
2695 | pg_auth_members_member_role_index | global/2695
2697 | pg_tablespace_oid_index | global/2697
2698 | pg_tablespace_spcname_index | global/2698
2703 | pg_type_oid_index | base/16384/2703
2704 | pg_type_typname_nsp_index | base/16384/2704
2836 | pg_toast_1255 | base/16384/2836
2837 | pg_toast_1255_index | base/16384/2837
2846 | pg_toast_2396 | global/2846
2847 | pg_toast_2396_index | global/2847
2964 | pg_db_role_setting | global/2964
2965 | pg_db_role_setting_databaseid_rol_index | global/2965
2966 | pg_toast_2964 | global/2966
2967 | pg_toast_2964_index | global/2967
3455 | pg_class_tblspc_relfilenode_index | base/16384/3455
3592 | pg_shseclabel | global/3592
3593 | pg_shseclabel_object_index | global/3593
4060 | pg_toast_3592 | global/4060
4061 | pg_toast_3592_index | global/4061
6000 | pg_replication_origin | global/6000
6001 | pg_replication_origin_roiident_index | global/6001
6002 | pg_replication_origin_roname_index | global/6002
6100 | pg_subscription | global/6100
6114 | pg_subscription_oid_index | global/6114
6115 | pg_subscription_subname_index | global/6115
(50 rows)
#查看template1系統表
template1=# select oid,relname,pg_relation_filepath(oid) from pg_class where relfilenode=0 order by 1;
oid | relname | pg_relation_filepath
------+-----------------------------------------+----------------------
1136 | pg_pltemplate | global/1136
1137 | pg_pltemplate_name_index | global/1137
1213 | pg_tablespace | global/1213
1214 | pg_shdepend | global/1214
1232 | pg_shdepend_depender_index | global/1232
1233 | pg_shdepend_reference_index | global/1233
1247 | pg_type | base/1/1247
1249 | pg_attribute | base/1/1249
1255 | pg_proc | base/1/1255
1259 | pg_class | base/1/1259
1260 | pg_authid | global/1260
1261 | pg_auth_members | global/1261
1262 | pg_database | global/1262
2396 | pg_shdescription | global/2396
2397 | pg_shdescription_o_c_index | global/2397
2658 | pg_attribute_relid_attnam_index | base/1/2658
2659 | pg_attribute_relid_attnum_index | base/1/2659
2662 | pg_class_oid_index | base/1/2662
2663 | pg_class_relname_nsp_index | base/1/2663
2671 | pg_database_datname_index | global/2671
2672 | pg_database_oid_index | global/2672
2676 | pg_authid_rolname_index | global/2676
2677 | pg_authid_oid_index | global/2677
2690 | pg_proc_oid_index | base/1/2690
2691 | pg_proc_proname_args_nsp_index | base/1/2691
2694 | pg_auth_members_role_member_index | global/2694
2695 | pg_auth_members_member_role_index | global/2695
2697 | pg_tablespace_oid_index | global/2697
2698 | pg_tablespace_spcname_index | global/2698
2703 | pg_type_oid_index | base/1/2703
2704 | pg_type_typname_nsp_index | base/1/2704
2836 | pg_toast_1255 | base/1/2836
2837 | pg_toast_1255_index | base/1/2837
2846 | pg_toast_2396 | global/2846
2847 | pg_toast_2396_index | global/2847
2964 | pg_db_role_setting | global/2964
2965 | pg_db_role_setting_databaseid_rol_index | global/2965
2966 | pg_toast_2964 | global/2966
2967 | pg_toast_2964_index | global/2967
3455 | pg_class_tblspc_relfilenode_index | base/1/3455
3592 | pg_shseclabel | global/3592
3593 | pg_shseclabel_object_index | global/3593
4060 | pg_toast_3592 | global/4060
4061 | pg_toast_3592_index | global/4061
6000 | pg_replication_origin | global/6000
6001 | pg_replication_origin_roiident_index | global/6001
6002 | pg_replication_origin_roname_index | global/6002
6100 | pg_subscription | global/6100
6114 | pg_subscription_oid_index | global/6114
6115 | pg_subscription_subname_index | global/6115
(50 rows)
可以看到path爲base的是與具體數據庫關聯的系統表，path爲global的是共享的系統表。base中的系統表文件一般是從template1中拷貝的，對應的文件名也是一樣的，因爲template1是創建數據庫的默認模板。