学习目标
学习表空间与数据库对象的关系。
在musicdb数据库中创建的所有的表，没有指定表空间的名字，因此都创建在数据库默认的表空间music_tbs中，当我们在musicdb数据库中创建表warehouse_t1的时候，明确指定在表空间ds_location1中创建时，这个表会存储在这个指定的表空间。即一个数据库中的对象，可以位于不同的表空间.
课程学习
1.连接数据库，准备测试环境
root@modb:~# su - omm omm@modb:~$ gsql -r gsql ((openGauss 3.0.0 build 02c14696) compiled at 2022-04-01 18:12:00 commit 0 last mr ) Non-SSL connection (SSL connection is recommended when requiring high-security) Type "help" for help. --进入数据库omm，创建表空间、测试数据库 omm=# drop database if exists musicdb; NOTICE: database "musicdb" does not exist, skipping DROP DATABASE omm=# drop database if exists musicdb1; NOTICE: database "musicdb1" does not exist, skipping DROP DATABASE omm=# drop database if exists musicdb2; NOTICE: database "musicdb2" does not exist, skipping DROP DATABASE omm=# drop database if exists musicdb3; NOTICE: database "musicdb3" does not exist, skipping omm=# DROP DATABASE omm=# drop tablespace if exists music_tbs; NOTICE: Tablespace "music_tbs" does not exist, skipping. DROP TABLESPACE omm=# create tablespace music_tbs relative location 'tablespace/test_ts1'; CREATE TABLESPACE omm=# create database musicdb with tablespace = music_tbs ; CREATE DATABASE omm=# create user user1 identified by 'kunpeng@1234'; NOTICE: The encrypted password contains MD5 ciphertext, which is not secure. CREATE ROLE omm=# alter user user1 sysadmin ; omm=# ALTER ROLE复制
2.创建表空间、查看表空间
--执行下面的命令，查看当前表空间omm=# \db List of tablespaces Name | Owner | Location ------------+-------+--------------------- music_tbs | omm | tablespace/test_ts1 pg_default | omm | pg_global | omm | (3 rows) --创建一个新的名为ds_location1的表空间： omm=# create tablespace ds_location1 relative location 'tabelspace/tablespace_1'; CREATE TABLESPACE--执行下面的命令，查看实例当前有哪些表空间： omm=# \db List of tablespaces Name | Owner | Location --------------+-------+------------------------- ds_location1 | omm | tablespace/tablespace_1 music_tbs | omm | tablespace/test_ts1 pg_default | omm | pg_global | omm | (4 rows)复制
3.使用user1用户，访问musicdb数据库 ，在表空间ds_location1上创建表warehouse_t1:
omm=# \c musicdb user1 Password for user user1: Non-SSL connection (SSL connection is recommended when requiring high-security) You are now connected to database "musicdb" as user "user1". musicdb=> create table warehouse_t1 (col1 char(10)) tablespace ds_location1; CREATE TABLE复制
4.查看musicdb数据库目前有哪些表：
musicdb=> select table_catalog, table_schema, table_name, table_type musicdb-> from information_schema.tables musicdb-> where table_schema not in ('pg_catalog', 'information_schema','dbe_perf'); (4 rows) musicdb=> table_catalog | table_schema | table_name | table_type ---------------+-----------------+--------------+------------ musicdb | db4ai | snapshot | BASE TABLE musicdb | dbe_pldeveloper | gs_errors | BASE TABLE musicdb | dbe_pldeveloper | gs_source | BASE TABLE musicdb | public | warehouse_t1 | BASE TABLE复制
5.查询表在那个表空间，系统表在默认表空间，非系统表在指定的表空间中（否则在默认表空间）
--建表warehouse_t1指定表空间ds_location1，查看表warehouse_t1所在的表空间：musicdb=> select * from pg_tables where tablename = 'warehouse_t1'; schemaname | tablename | tableowner | tablespace | hasindexes | hasrules | hastriggers | tablecreator | created | last_ddl_time ------------+--------------+------------+--------------+------------+----------+-------------+--------------+-------------------------------+------------------------------- public | warehouse_t1 | user1 | ds_location1 | f | f | f | user1 | 2022-12-01 10:35:47.309635+08 | 2022-12-01 10:35:47.309635+08 (1 row)--创建表warehouse_t12未指定表空间，则在默认表空间（不显示默认表空间名）musicdb=> create table warehouse_t12 (col1 char(10)); CREATE TABLE musicdb=> select * from pg_tables where tablename = 'warehouse_t12'; schemaname | tablename | tableowner | tablespace | hasindexes | hasrules | hastriggers | tablecreator | created | last_ddl_time ------------+---------------+------------+------------+------------+----------+-------------+--------------+-------------------------------+------------------------------- public | warehouse_t12 | user1 | | f | f | f | user1 | 2022-12-01 10:43:45.496309+08 | 2022-12-01 10:43:45.496309+08 (1 row)复制
6.查看openGuass数据库的默认表空间
musicdb=> select datname,dattablespace,spcname from pg_database d, pg_tablespace t where d.dattablespace=t.oid; datname | dattablespace | spcname -----------+---------------+------------ template1 | 1663 | pg_default omm | 1663 | pg_default musicdb | 16389 | music_tbs template0 | 1663 | pg_default postgres | 1663 | pg_default (5 rows)复制
7.查询数据库的默认表空间上的对象
musicdb=> select relname, relkind, relpages,pg_size_pretty(pg_relation_size(a.oid)),reltablespace,relowner musicdb-> from pg_class a musicdb-> where a.relkind in ('r', 'i') musicdb-> and reltablespace='0' musicdb-> order by a.relpages desc; relname | relkind | relpages | pg_size_pretty | reltablespace | relowner ------------------------------------------------+---------+----------+----------------+---------------+---------- pg_attribute | r | 184 | 1472 kB | 0 | 10 pg_proc | r | 140 | 1120 kB | 0 | 10 pg_depend | r | 59 | 472 kB | 0 | 10 pg_class | r | 52 | 416 kB | 0 | 10 pg_attribute_relid_attnam_index | i | 44 | 352 kB | 0 | 10 pg_proc_proname_all_args_nsp_index | i | 41 | 328 kB | 0 | 10 pg_class_relname_nsp_index | i | 14 | 112 kB | 0 | 10 pg_proc_oid_index | i | 13 | 104 kB | 0 | 10 pg_proc_proname_args_nsp_new_index | i | 39 | 312 kB | 0 | 10 pg_proc_proname_args_nsp_index | i | 39 | 312 kB | 0 | 10 pg_rewrite | r | 37 | 296 kB | 0 | 10 pg_depend_depender_index | i | 34 | 272 kB | 0 | 10 pg_depend_reference_index | i | 34 | 272 kB | 0 | 10 pg_description | r | 31 | 248 kB | 0 | 10 pg_attribute_relid_attnum_index | i | 30 | 240 kB | 0 | 10 pg_type | r | 20 | 160 kB | 0 | 10 pg_class_tblspc_relfilenode_index | i | 10 | 80 kB | 0 | 10 pg_amop | r | 9 | 72 kB | 0 | 10 --More-- pg_statistic | r | 19 | 152 kB | 0 | 10 pg_description_o_c_o_index | i | 16 | 128 kB | 0 | 10 pg_operator | r | 15 | 120 kB | 0 | 10 pg_class_oid_index | i | 7 | 56 kB | 0 | 10 sql_features | r | 7 | 56 kB | 0 | 10 pg_type_typname_nsp_index | i | 7 | 56 kB | 0 | 10 pg_index | r | 7 | 56 kB | 0 | 10 pg_amop_fam_strat_index | i | 6 | 48 kB | 0 | 10 pg_operator_oprname_l_r_n_index | i | 6 | 48 kB | 0 | 10 pg_amop_opr_fam_index | i | 6 | 48 kB | 0 | 10 pg_amop_oid_index | i | 5 | 40 kB | 0 | 10 pg_operator_oid_index | i | 5 | 40 kB | 0 | 10 pg_type_oid_index | i | 5 | 40 kB | 0 | 10 pg_opclass_am_name_nsp_index | i | 4 | 32 kB | 0 | 10 pg_statistic_relid_kind_att_inh_index | i | 4 | 32 kB | 0 | 10 pg_ts_config_map_index | i | 4 | 32 kB | 0 | 10 pg_amproc_oid_index | i | 4 | 32 kB | 0 | 10 pg_toast_2618_index | i | 4 | 32 kB | 0 | 10 pg_rewrite_rel_rulename_index | i | 4 | 32 kB | 0 | 10 pg_amproc_fam_proc_index | i | 4 | 32 kB | 0 | 10 pg_amproc | r | 4 | 32 kB | 0 | 10 pg_opclass | r | 4 | 32 kB | 0 | 10 pg_cast_oid_index | i | 4 | 32 kB | 0 | 10 pg_cast_source_target_index | i | 4 | 32 kB | 0 | 10 pg_conversion | r | 3 | 24 kB | 0 | 10 pg_cast | r | 3 | 24 kB | 0 | 10 pg_opfamily | r | 3 | 24 kB | 0 | 10 pg_conversion_default_index | i | 2 | 16 kB | 0 | 10 pg_conversion_name_nsp_index | i | 2 | 16 kB | 0 | 10 pg_conversion_oid_index | i | 2 | 16 kB | 0 | 10 pg_namespace_oid_index | i | 2 | 16 kB | 0 | 10 pg_namespace_nspname_index | i | 2 | 16 kB | 0 | 10 pg_toast_1255_index | i | 2 | 16 kB | 0 | 10 pg_ts_template_oid_index | i | 2 | 16 kB | 0 | 10 pg_ts_dict_dictname_index | i | 2 | 16 kB | 0 | 10 pg_extension_oid_index | i | 2 | 16 kB | 0 | 10 pg_collation_oid_index | i | 2 | 16 kB | 0 | 10 pg_ts_template_tmplname_index | i | 2 | 16 kB | 0 | 10 pg_foreign_server_name_index | i | 2 | 16 kB | 0 | 10 pg_foreign_server_oid_index | i | 2 | 16 kB | 0 | 10 pg_collation_name_enc_nsp_index | i | 2 | 16 kB | 0 | 10 pg_ts_config_cfgname_index | i | 2 | 16 kB | 0 | 10 pg_rewrite_oid_index | i | 2 | 16 kB | 0 | 10 streaming_gather_agg_index | i | 2 | 16 kB | 0 | 10 pg_foreign_data_wrapper_name_index | i | 2 | 16 kB | 0 | 10 pg_range_rngtypid_index | i | 2 | 16 kB | 0 | 10 pg_ts_parser_oid_index | i | 2 | 16 kB | 0 | 10 pg_foreign_data_wrapper_oid_index | i | 2 | 16 kB | 0 | 10 pg_aggregate_fnoid_index | i | 2 | 16 kB | 0 | 10 pg_aggregate | r | 2 | 16 kB | 0 | 10 pg_ts_parser_prsname_index | i | 2 | 16 kB | 0 | 10 pg_ts_config_oid_index | i | 2 | 16 kB | 0 | 10 pg_attrdef_adrelid_adnum_index | i | 2 | 16 kB | 0 | 10 pg_attrdef_oid_index | i | 2 | 16 kB | 0 | 10 pg_language_oid_index | i | 2 | 16 kB | 0 | 10 pg_ts_dict_oid_index | i | 2 | 16 kB | 0 | 10 pg_constraint_conname_nsp_index | i | 2 | 16 kB | 0 | 10 pg_constraint_conrelid_index | i | 2 | 16 kB | 0 | 10 pg_constraint_contypid_index | i | 2 | 16 kB | 0 | 10 pg_constraint_oid_index | i | 2 | 16 kB | 0 | 10 pg_ts_config_map | r | 2 | 16 kB | 0 | 10 pg_language_name_index | i | 2 | 16 kB | 0 | 10 pg_toast_2619_index | i | 2 | 16 kB | 0 | 10 pg_am_oid_index | i | 2 | 16 kB | 0 | 10 pg_index_indrelid_index | i | 2 | 16 kB | 0 | 10 pg_index_indexrelid_index | i | 2 | 16 kB | 0 | 10 pg_am_name_index | i | 2 | 16 kB | 0 | 10 pg_extension_name_index | i | 2 | 16 kB | 0 | 10 pg_opclass_oid_index | i | 2 | 16 kB | 0 | 10 pg_opfamily_am_name_nsp_index | i | 2 | 16 kB | 0 | 10 pg_opfamily_oid_index | i | 2 | 16 kB | 0 | 10 gs_encrypted_proc_oid | i | 1 | 8192 bytes | 0 | 10 pg_toast_12165_index | i | 1 | 8192 bytes | 0 | 10 pg_toast_12172_index | i | 1 | 8192 bytes | 0 | 10 pg_toast_12178_index | i | 1 | 8192 bytes | 0 | 10 pg_toast_12465_index | i | 1 | 8192 bytes | 0 | 10 pg_toast_12479_index | i | 1 | 8192 bytes | 0 | 10 pg_toast_12489_index | i | 1 | 8192 bytes | 0 | 10 pg_toast_12541_index | i | 1 | 8192 bytes | 0 | 10 statement_history_time_idx | i | 1 | 8192 bytes | 0 | 10 pg_toast_12512_index | i | 1 | 8192 bytes | 0 | 10 pg_toast_12547_index | i | 1 | 8192 bytes | 0 | 10 gs_source_id_idx | i | 1 | 8192 bytes | 0 | 10 gs_source_idx | i | 1 | 8192 bytes | 0 | 10 gs_errors_id_idx | i | 1 | 8192 bytes | 0 | 10 pg_toast_12554_index | i | 1 | 8192 bytes | 0 | 10 gs_errors_idx | i | 1 | 8192 bytes | 0 | 10 gs_client_global_keys_args_oid_index | i | 1 | 8192 bytes | 0 | 10 pg_toast_3220_index | i | 1 | 8192 bytes | 0 | 10 pg_statistic_ext_relid_kind_inh_key_index | i | 1 | 8192 bytes | 0 | 10 pg_user_mapping_oid_index | i | 1 | 8192 bytes | 0 | 10 pg_user_mapping_user_server_index | i | 1 | 8192 bytes | 0 | 10 pg_toast_12526_index | i | 1 | 8192 bytes | 0 | 10 pg_toast_7815_index | i | 1 | 8192 bytes | 0 | 10 pg_largeobject_loid_pn_index | i | 1 | 8192 bytes | 0 | 10 gs_package_name_index | i | 1 | 8192 bytes | 0 | 10 gs_package_oid_index | i | 1 | 8192 bytes | 0 | 10 pg_toast_9016_index | i | 1 | 8192 bytes | 0 | 10 pg_partition_reloid_index | i | 1 | 8192 bytes | 0 | 10 pg_partition_parentoid_index | i | 1 | 8192 bytes | 0 | 10 pg_partition_indextblid_index | i | 1 | 8192 bytes | 0 | 10 pg_partition_partoid_index | i | 1 | 8192 bytes | 0 | 10 pg_partition_indextblid_parentoid_reloid_index | i | 1 | 8192 bytes | 0 | 10 pg_attrdef | r | 1 | 8192 bytes | 0 | 10 pg_toast_2604_index | i | 1 | 8192 bytes | 0 | 10 pg_constraint | r | 1 | 8192 bytes | 0 | 10 pg_toast_2606_index | i | 1 | 8192 bytes | 0 | 10 pg_inherits_parent_index | i | 1 | 8192 bytes | 0 | 10 pg_inherits_relid_seqno_index | i | 1 | 8192 bytes | 0 | 10 pg_am | r | 1 | 8192 bytes | 0 | 10 pg_language | r | 1 | 8192 bytes | 0 | 10 pg_largeobject_metadata_oid_index | i | 1 | 8192 bytes | 0 | 10 pg_toast_2620_index | i | 1 | 8192 bytes | 0 | 10 pg_trigger_tgconstraint_index | i | 1 | 8192 bytes | 0 | 10 pg_trigger_tgrelid_tgname_index | i | 1 | 8192 bytes | 0 | 10 pg_trigger_oid_index | i | 1 | 8192 bytes | 0 | 10 pg_toast_2609_index | i | 1 | 8192 bytes | 0 | 10 pg_enum_oid_index | i | 1 | 8192 bytes | 0 | 10 pg_enum_typid_label_index | i | 1 | 8192 bytes | 0 | 10 pg_enum_typid_sortorder_index | i | 1 | 8192 bytes | 0 | 10 pg_namespace | r | 1 | 8192 bytes | 0 | 10 streaming_cont_query_schema_change_index | i | 1 | 8192 bytes | 0 | 10 streaming_reaper_status_id_index | i | 1 | 8192 bytes | 0 | 10 streaming_reaper_status_oid_index | i | 1 | 8192 bytes | 0 | 10 gs_matview_oid_index | i | 1 | 8192 bytes | 0 | 10 gs_matviewdep_oid_index | i | 1 | 8192 bytes | 0 | 10 pgxc_slice_relid_index | i | 1 | 8192 bytes | 0 | 10 pgxc_slice_order_index | i | 1 | 8192 bytes | 0 | 10 gs_opt_model_name_index | i | 1 | 8192 bytes | 0 | 10 pg_toast_3991_index | i | 1 | 8192 bytes | 0 | 10 gs_model_oid_index | i | 1 | 8192 bytes | 0 | 10 gs_model_name_index | i | 1 | 8192 bytes | 0 | 10 gs_recyclebin_id_index | i | 1 | 8192 bytes | 0 | 10 gs_recyclebin_baseid_index | i | 1 | 8192 bytes | 0 | 10 gs_recyclebin_name_index | i | 1 | 8192 bytes | 0 | 10 gs_recyclebin_dbid_nsp_oriname_index | i | 1 | 8192 bytes | 0 | 10 gs_recyclebin_dbid_spcid_rcycsn_index | i | 1 | 8192 bytes | 0 | 10 gs_recyclebin_dbid_relid_index | i | 1 | 8192 bytes | 0 | 10 gs_txn_snapshot_time_csn_index | i | 1 | 8192 bytes | 0 | 10 gs_txn_snapshot_csn_xmin_index | i | 1 | 8192 bytes | 0 | 10 gs_txn_snapshot_xmin_index | i | 1 | 8192 bytes | 0 | 10 gs_job_argument_oid_index | i | 1 | 8192 bytes | 0 | 10 gs_job_argument_name_index | i | 1 | 8192 bytes | 0 | 10 gs_job_argument_position_index | i | 1 | 8192 bytes | 0 | 10 gs_job_attribute_oid_index | i | 1 | 8192 bytes | 0 | 10 gs_job_attribute_name_index | i | 1 | 8192 bytes | 0 | 10 gs_uid_relid_index | i | 1 | 8192 bytes | 0 | 10 gs_db_privilege_oid_index | i | 1 | 8192 bytes | 0 | 10 gs_db_privilege_roleid_index | i | 1 | 8192 bytes | 0 | 10 gs_db_privilege_roleid_privilege_type_index | i | 1 | 8192 bytes | 0 | 10 pg_publication_oid_index | i | 1 | 8192 bytes | 0 | 10 pg_publication_pubname_index | i | 1 | 8192 bytes | 0 | 10 pg_publication_rel_oid_index | i | 1 | 8192 bytes | 0 | 10 pg_publication_rel_map_index | i | 1 | 8192 bytes | 0 | 10 gs_auditing_policy_oid_index | i | 1 | 8192 bytes | 0 | 10 gs_auditing_policy_name_index | i | 1 | 8192 bytes | 0 | 10 gs_auditing_policy_access_oid_index | i | 1 | 8192 bytes | 0 | 10 gs_auditing_policy_access_row_index | i | 1 | 8192 bytes | 0 | 10 gs_auditing_policy_filters_oid_index | i | 1 | 8192 bytes | 0 | 10 gs_auditing_policy_filters_row_index | i | 1 | 8192 bytes | 0 | 10 gs_auditing_policy_privileges_oid_index | i | 1 | 8192 bytes | 0 | 10 gs_auditing_policy_privileges_row_index | i | 1 | 8192 bytes | 0 | 10 gs_policy_label_oid_index | i | 1 | 8192 bytes | 0 | 10 gs_policy_label_name_index | i | 1 | 8192 bytes | 0 | 10 gs_masking_policy_oid_index | i | 1 | 8192 bytes | 0 | 10 gs_masking_policy_name_index | i | 1 | 8192 bytes | 0 | 10 gs_masking_policy_actions_oid_index | i | 1 | 8192 bytes | 0 | 10 gs_masking_policy_actions_row_index | i | 1 | 8192 bytes | 0 | 10 gs_masking_policy_actions_policy_oid_index | i | 1 | 8192 bytes | 0 | 10 gs_masking_policy_filters_oid_index | i | 1 | 8192 bytes | 0 | 10 gs_masking_policy_filters_row_index | i | 1 | 8192 bytes | 0 | 10 pg_toast_13703_index | i | 1 | 8192 bytes | 0 | 10 sql_implementation_info | r | 1 | 8192 bytes | 0 | 10 pg_toast_13708_index | i | 1 | 8192 bytes | 0 | 10 sql_languages | r | 1 | 8192 bytes | 0 | 10 pg_toast_13713_index | i | 1 | 8192 bytes | 0 | 10 sql_packages | r | 1 | 8192 bytes | 0 | 10 pg_toast_13718_index | i | 1 | 8192 bytes | 0 | 10 sql_parts | r | 1 | 8192 bytes | 0 | 10 pg_toast_13723_index | i | 1 | 8192 bytes | 0 | 10 sql_sizing | r | 1 | 8192 bytes | 0 | 10 pg_toast_13728_index | i | 1 | 8192 bytes | 0 | 10 pg_toast_13930_index | i | 1 | 8192 bytes | 0 | 10 pg_toast_13733_index | i | 1 | 8192 bytes | 0 | 10 snapshot_pkey | i | 1 | 8192 bytes | 0 | 10 snapshot_id_key | i | 1 | 8192 bytes | 0 | 10 pg_ts_config | r | 1 | 8192 bytes | 0 | 10 pg_ts_dict | r | 1 | 8192 bytes | 0 | 10 pg_ts_parser | r | 1 | 8192 bytes | 0 | 10 pg_ts_template | r | 1 | 8192 bytes | 0 | 10 pg_extension | r | 1 | 8192 bytes | 0 | 10 pg_foreign_data_wrapper | r | 1 | 8192 bytes | 0 | 10 pg_foreign_server | r | 1 | 8192 bytes | 0 | 10 pg_toast_9001_index | i | 1 | 8192 bytes | 0 | 10 pgxc_class_pcrelid_index | i | 1 | 8192 bytes | 0 | 10 pg_foreign_table_relid_index | i | 1 | 8192 bytes | 0 | 10 pg_toast_3254_index | i | 1 | 8192 bytes | 0 | 10 pg_rlspolicy_oid_index | i | 1 | 8192 bytes | 0 | 10 pg_rlspolicy_polrelid_polname_index | i | 1 | 8192 bytes | 0 | 10 pg_default_acl_role_nsp_obj_index | i | 1 | 8192 bytes | 0 | 10 pg_default_acl_oid_index | i | 1 | 8192 bytes | 0 | 10 pg_toast_3596_index | i | 1 | 8192 bytes | 0 | 10 pg_seclabel_object_index | i | 1 | 8192 bytes | 0 | 10 pg_collation | r | 1 | 8192 bytes | 0 | 10 pg_range | r | 1 | 8192 bytes | 0 | 10 gs_encrypted_columns_oid_index | i | 1 | 8192 bytes | 0 | 10 gs_encrypted_columns_rel_id_column_name_index | i | 1 | 8192 bytes | 0 | 10 gs_column_keys_oid_index | i | 1 | 8192 bytes | 0 | 10 gs_column_keys_name_index | i | 1 | 8192 bytes | 0 | 10 gs_column_keys_distributed_id_index | i | 1 | 8192 bytes | 0 | 10 gs_column_keys_args_oid_index | i | 1 | 8192 bytes | 0 | 10 gs_client_global_keys_oid_index | i | 1 | 8192 bytes | 0 | 10 gs_client_global_keys_name_index | i | 1 | 8192 bytes | 0 | 10 gs_encrypted_proc_func_id_index | i | 1 | 8192 bytes | 0 | 10 gs_asp_sampletime_index | i | 1 | 8192 bytes | 0 | 10 pg_object_index | i | 1 | 16 kB | 0 | 10 pg_synonym_name_nsp_index | i | 1 | 8192 bytes | 0 | 10 pg_synonym_oid_index | i | 1 | 8192 bytes | 0 | 10 pg_directory_oid_index | i | 1 | 8192 bytes | 0 | 10 pg_directory_name_index | i | 1 | 8192 bytes | 0 | 10 pg_toast_9027_index | i | 1 | 8192 bytes | 0 | 10 pg_hashbucket_oid_index | i | 1 | 8192 bytes | 0 | 10 pg_hashbucket_bid_index | i | 1 | 8192 bytes | 0 | 10 pg_toast_5818_index | i | 1 | 8192 bytes | 0 | 10 gs_global_chain_relid_index | i | 1 | 8192 bytes | 0 | 10 streaming_stream_oid_index | i | 1 | 8192 bytes | 0 | 10 streaming_stream_relid_index | i | 1 | 8192 bytes | 0 | 10 streaming_cont_query_relid_index | i | 1 | 8192 bytes | 0 | 10 streaming_cont_query_defrelid_index | i | 1 | 8192 bytes | 0 | 10 streaming_cont_query_id_index | i | 1 | 8192 bytes | 0 | 10 streaming_cont_query_oid_index | i | 1 | 8192 bytes | 0 | 10 streaming_cont_query_matrelid_index | i | 1 | 8192 bytes | 0 | 10 streaming_cont_query_lookupidxid_index | i | 1 | 8192 bytes | 0 | 10 pg_enum | r | 0 | 0 bytes | 0 | 10 pgxc_slice | r | 0 | 0 bytes | 0 | 10 pg_trigger | r | 0 | 0 bytes | 0 | 10 pg_largeobject_metadata | r | 0 | 0 bytes | 0 | 10 pg_inherits | r | 0 | 0 bytes | 0 | 10 pg_partition | r | 0 | 0 bytes | 0 | 10 gs_masking_policy_filters | r | 0 | 0 bytes | 0 | 10 plan_table_data | r | 0 | 0 bytes | 0 | 10 gs_package | r | 0 | 0 bytes | 0 | 10 pg_directory | r | 0 | 0 bytes | 0 | 10 pg_largeobject | r | 0 | 0 bytes | 0 | 10 gs_errors | r | 0 | 0 bytes | 0 | 10 gs_auditing_policy | r | 0 | 0 bytes | 0 | 10 statement_history | r | 0 | 0 bytes | 0 | 10 gs_source | r | 0 | 0 bytes | 0 | 10 gs_opt_model | r | 0 | 0 bytes | 0 | 10 gs_wlm_ec_operator_info | r | 0 | 0 bytes | 0 | 10 gs_wlm_plan_encoding_table | r | 0 | 0 bytes | 0 | 10 pg_obsscaninfo | r | 0 | 0 bytes | 0 | 10 pg_hashbucket | r | 0 | 0 bytes | 0 | 10 gs_wlm_plan_operator_info | r | 0 | 0 bytes | 0 | 10 gs_wlm_operator_info | r | 0 | 0 bytes | 0 | 10 gs_job_attribute | r | 0 | 0 bytes | 0 | 10 pg_user_mapping | r | 0 | 0 bytes | 0 | 10 gs_wlm_user_resource_history | r | 0 | 0 bytes | 0 | 10 pgxc_class | r | 0 | 0 bytes | 0 | 10 gs_model_warehouse | r | 0 | 0 bytes | 0 | 10 gs_masking_policy_actions | r | 0 | 0 bytes | 0 | 10 pg_foreign_table | r | 0 | 0 bytes | 0 | 10 gs_global_chain | r | 0 | 0 bytes | 0 | 10 pg_rlspolicy | r | 0 | 0 bytes | 0 | 10 gs_policy_label | r | 0 | 0 bytes | 0 | 10 gs_uid | r | 0 | 0 bytes | 0 | 10 streaming_stream | r | 0 | 0 bytes | 0 | 10 pg_default_acl | r | 0 | 0 bytes | 0 | 10 gs_recyclebin | r | 0 | 0 bytes | 0 | 10 gs_auditing_policy_access | r | 0 | 0 bytes | 0 | 10 pg_seclabel | r | 0 | 0 bytes | 0 | 10 streaming_cont_query | r | 0 | 0 bytes | 0 | 10 gs_db_privilege | r | 0 | 0 bytes | 0 | 10 snapshot | r | 0 | 0 bytes | 0 | 10 gs_wlm_session_query_info_all | r | 0 | 0 bytes | 0 | 10 gs_wlm_instance_history | r | 0 | 0 bytes | 0 | 10 sql_sizing_profiles | r | 0 | 0 bytes | 0 | 10 pg_statistic_ext | r | 0 | 0 bytes | 0 | 10 gs_encrypted_columns | r | 0 | 0 bytes | 0 | 10 gs_auditing_policy_filters | r | 0 | 0 bytes | 0 | 10 pg_publication | r | 0 | 0 bytes | 0 | 10 gs_column_keys | r | 0 | 0 bytes | 0 | 10 gs_txn_snapshot | r | 0 | 0 bytes | 0 | 10 gs_masking_policy | r | 0 | 0 bytes | 0 | 10 streaming_reaper_status | r | 0 | 0 bytes | 0 | 10 gs_column_keys_args | r | 0 | 0 bytes | 0 | 10 warehouse_t12 | r | 0 | 0 bytes | 0 | 16391 gs_client_global_keys | r | 0 | 0 bytes | 0 | 10 pg_publication_rel | r | 0 | 0 bytes | 0 | 10 gs_matview | r | 0 | 0 bytes | 0 | 10 gs_encrypted_proc | r | 0 | 0 bytes | 0 | 10 gs_client_global_keys_args | r | 0 | 0 bytes | 0 | 10 gs_job_argument | r | 0 | 0 bytes | 0 | 10 gs_asp | r | 0 | 0 bytes | 0 | 10 gs_matview_dependency | r | 0 | 0 bytes | 0 | 10 pg_object | r | 0 | 8192 bytes | 0 | 10 gs_auditing_policy_privileges | r | 0 | 0 bytes | 0 | 10 pg_synonym | r | 0 | 0 bytes | 0 | 10 (316 rows)复制
8.查询表空间ds_location1上的对像
musicdb=> \c musicdb user1 Password for user user1: musicdb=> Non-SSL connection (SSL connection is recommended when requiring high-security) You are now connected to database "musicdb" as user "user1". musicdb=> musicdb-> from pg_class a, pg_tablespace tb select relname, relkind, relpages,pg_size_pretty(pg_relation_size(a.oid)),reltablespace,relowner where a.relkind in ('r', 'i') musicdb-> musicdb-> and a.reltablespace=tb.oid musicdb-> and tb.spcname='ds_location1' musicdb-> order by a.relpages desc; relname | relkind | relpages | pg_size_pretty | reltablespace | relowner --------------+---------+----------+----------------+---------------+---------- warehouse_t1 | r | 0 | 0 bytes | 16395 | 16391 (1 row)复制
课后作业
1.创建表空间newtbs1、 ds_location1，查看表空间
omm=# create tablespace newtbs1 relative location 'tablespace/test_ts1'; CREATE TABLESPACE omm=# create tablespace ds_location1 relative location 'tablespace/test_ts2'; CREATE TABLESPACE omm=# \db List of tablespaces Name | Owner | Location --------------+-------+--------------------- ds_location1 | omm | tablespace/test_ts2 newtbs1 | omm | tablespace/test_ts1 pg_default | omm | pg_global | omm | (4 rows)复制
2.创建一个数据库newdb1，默认表空间为newtbs1
omm=# create database newdb1 with tablespace = newtbs1; CREATE DATABASEomm=# set default_tablespace ='newtbs1'; SET复制
3.创建用户user5，并授予SYSADMIN权限，访问数据库newdb1，在表空间ds_location1上，创建一个表newt1（表结构自定义）
omm=# create user user5 identified by 'kunpeng@1234'; NOTICE: The encrypted password contains MD5 ciphertext, which is not secure. CREATE ROLE omm=# alter user user5 sysadmin ; ALTER ROLEomm=# \c newdb1 user5 Password for user user5: newdb1=> Non-SSL connection (SSL connection is recommended when requiring high-security) You are now connected to database "newdb1" as user "user5".newdb1=> create table newt1(col char(10)) tablespace ds_location1 ; newdb1=> CREATE TABLE复制
4.查看表所在的表空间
--查看数据库目前的表newdb1=> select table_catalog, table_schema, table_name, table_type from information_schema.tables where table_schema not in ('pg_catalog', 'information_schema','dbe_perf'); table_catalog | table_schema | table_name | table_type ---------------+-----------------+------------+------------ newdb1 | db4ai | snapshot | BASE TABLE newdb1 | dbe_pldeveloper | gs_errors | BASE TABLE newdb1 | dbe_pldeveloper | gs_source | BASE TABLE newdb1 | public | newt1 | BASE TABLE (4 rows)newdb1=> select * from pg_tables where tablename = 'newt1'; schemaname | tablename | tableowner | tablespace | hasindexes | hasrules | hastriggers | tablecreator | created | last_ddl_time ------------+-----------+------------+--------------+------------+----------+-------------+--------------+-------------------------------+------------------------------- public | newt1 | user5 | ds_location1 | f | f | f | user5 | 2022-12-01 11:17:25.521079+08 | 2022-12-01 11:17:25.521079+08 (1 row)--创建一个表在默认空间上newdb1=> create table new2(col char(10)); CREATE TABLEnewdb1=> select * from pg_tables where tablename ='new2'; schemaname | tablename | tableowner | tablespace | hasindexes | hasrules | hastriggers | tablecreator | created | last_ddl_time ------------+-----------+------------+------------+------------+----------+-------------+--------------+-------------------------------+------------------------------- public | new2 | user5 | | f | f | f | user5 | 2022-12-01 12:42:31.368784+08 | 2022-12-01 12:42:31.368784+08 (1 row)复制
5.查看表空间newtbs1、 ds_location1上的对象
--查看opengauss数据库默认表空间newdb1=> select datname,dattablespace,spcname from pg_database d, pg_tablespace t where d.dattablespace=t.oid; datname | dattablespace | spcname -----------+---------------+------------ template1 | 1663 | pg_default omm | 1663 | pg_default newdb1 | 16389 | newtbs1 template0 | 1663 | pg_default postgres | 1663 | pg_default (5 rows)newdb1=> select relname, relkind, relpages,pg_size_pretty(pg_relation_size(a.oid)),reltablespace,relowner newdb1-> from pg_class a newdb1-> where a.relkind in ('r', 'i') newdb1-> and reltablespace='0' newdb1-> order by a.relpages asc; relname | relkind | relpages | pg_size_pretty | reltablespace | relowner ------------------------------------------------+---------+----------+----------------+---------------+---------- gs_wlm_plan_operator_info | r | 0 | 0 bytes | 0 | 10 new2 | r | 0 | 0 bytes | 0 | 16392 sql_sizing_profiles | r | 0 | 0 bytes | 0 | 10 pg_largeobject | r | 0 | 0 bytes | 0 | 10 gs_masking_policy_filters | r | 0 | 0 bytes | 0 | 10 gs_model_warehouse | r | 0 | 0 bytes | 0 | 10 gs_opt_model | r | 0 | 0 bytes | 0 | 10 gs_masking_policy_actions | r | 0 | 0 bytes | 0 | 10 gs_package | r | 0 | 0 bytes | 0 | 10 pgxc_slice | r | 0 | 0 bytes | 0 | 10 gs_matview_dependency | r | 0 | 0 bytes | 0 | 10 gs_matview | r | 0 | 0 bytes | 0 | 10 streaming_reaper_status | r | 0 | 0 bytes | 0 | 10 pg_inherits | r | 0 | 0 bytes | 0 | 10 gs_masking_policy | r | 0 | 0 bytes | 0 | 10 gs_policy_label | r | 0 | 0 bytes | 0 | 10 streaming_cont_query | r | 0 | 0 bytes | 0 | 10 streaming_stream | r | 0 | 0 bytes | 0 | 10 gs_global_chain | r | 0 | 0 bytes | 0 | 10 pg_hashbucket | r | 0 | 0 bytes | 0 | 10 pg_directory | r | 0 | 0 bytes | 0 | 10 --More-- newdb1=> select relname, relkind, relpages,pg_size_pretty(pg_relation_size(a.oid)),reltablespace,relowner newdb1-> from pg_class a, pg_tablespace tb newdb1-> where a.relkind in ('r', 'i') newdb1-> and a.reltablespace=tb.oid newdb1-> and tb.spcname='ds_location1' newdb1-> order by a.relpages desc; relname | relkind | relpages | pg_size_pretty | reltablespace | relowner ---------+---------+----------+----------------+---------------+---------- newt1 | r | 0 | 0 bytes | 16390 | 16392 (1 row)newdb1=> select relname, relkind, relpages,pg_size_pretty(pg_relation_size(a.oid)),reltablespace,relowner newdb1-> from pg_class a, pg_tablespace tb newdb1-> where a.relkind in ('r', 'i') newdb1-> and a.reltablespace=tb.oid newdb1-> and tb.spcname='newtbs1' newdb1-> order by a.relpages desc; relname | relkind | relpages | pg_size_pretty | reltablespace | relowner ---------+---------+----------+----------------+---------------+---------- (0 rows)
「喜欢这篇文章，您的关注和赞赏是给作者最好的鼓励」
关注作者
【版权声明】本文为墨天轮用户原创内容，转载时必须标注文章的来源（墨天轮），文章链接，文章作者等基本信息，否则作者和墨天轮有权追究责任。如果您发现墨天轮中有涉嫌抄袭或者侵权的内容，欢迎发送邮件至：contact@modb.pro进行举报，并提供相关证据，一经查实，墨天轮将立刻删除相关内容。
评论
墨天轮-雪宝君
2年前
评论
0
作业审核合格，一起参与21天openGauss学习打卡活动！
活动详情：https://www.modb.pro/db/5516192年前
点赞 评论
相关阅读
2025年3月国产数据库大事记
墨天轮编辑部
895次阅读
2025-04-03 15:21:16
MogDB 发布更新，解决 openGauss 数据库在长事务情况下Ustore表膨胀问题
MogDB
289次阅读
2025-04-17 10:41:41
openGauss 7.0.0-RC1 版本正式发布!
Gauss松鼠会
207次阅读
2025-04-01 12:27:03
MogDB 发布更新，解决 openGauss 数据库在长事务情况下Ustore表膨胀问题
云和恩墨
189次阅读
2025-04-16 09:52:02
openGauss 7.0.0-RC1 版本体验：一主一备快速安装指南
孙莹
181次阅读
2025-04-01 10:30:07
鲲鹏RAG一体机解决方案正式发布 openGauss DataVec向量数据库助力DeepSeek行业应用
Gauss松鼠会
124次阅读
2025-03-31 10:00:29
荣誉时刻！openGauss认证证书快递已发，快来看看谁榜上有名！
墨天轮小教习
113次阅读
2025-04-23 17:39:13
openGauss6.0.0适配操作系统自带的软件，不依赖三方库
来杯拿铁
77次阅读
2025-04-18 10:49:53
opengauss使用gs_probackup进行增量备份恢复
进击的CJR
70次阅读
2025-04-09 16:11:58
GitCode 成 openGauss 新归宿，国产开源数据库里程碑事件
严少安
67次阅读
2025-04-27 11:37:53
