索引相关操作
最近更新时间: 2024-06-12 15:06:00
建立索引。
postgres=# create unique index tbase_id_uidx on tbase(id); CREATE INDEX postgres=# create index tbase_mc_idx on tbase(mc); CREATE INDEX postgres=#\di查看索引列表。
postgres=# \di List of relations Schema | Name | Type | Owner | Table --------+---------------+-------+-------+------- public | tbase_id_uidx | index | tbase | tbase public | tbase_mc_idx | index | tbase | tbase (2 rows)\di+查看索引列表详细信息（包含注释），占用空间大小--只能在dn上面查看索引大小。
postgres=# \di+ List of relations Schema | Name | Type | Owner | Table | Size | Description --------+---------------+-------+-------+-------+------------+--------------- public | tbase_id_uidx | index | tbase | tbase | 8192 bytes | tbase唯一索引 public | tbase_mc_idx | index | tbase | tbase | 8192 bytes | (2 rows)\di+显示某个模式下的所有索引--只能在dn上面查看索引大小。
postgres=# \di+ public.* List of relations Schema | Name | Type | Owner | Table | Size | Description --------+---------------+-------+-------+-------+------------+--------------- public | tbase_id_uidx | index | tbase | tbase | 8192 bytes | tbase唯一索引 public | tbase_mc_idx | index | tbase | tbase | 8192 bytes | (2 rows)\di+索引名显示某个索引的详细信息--只能在dn上面查看索引大小。
postgres=# \di+ public.tbase_id_uidx List of relations Schema | Name | Type | Owner | Table | Size | Description --------+---------------+-------+-------+-------+------------+--------------- public | tbase_id_uidx | index | tbase | tbase | 8192 bytes | tbase唯一索引 (1 row)\di+通配符列出适配的索引--只能在dn上面查看索引大小。
postgres=# \di+ *idx List of relations Schema | Name | Type | Owner | Table | Size | Description --------+-------------------+-------+-------+------------+------------+--------------- pgxc |order_main_id_idx | index | tbase |order_main | 8192 bytes | public | tbase_id_uidx | index | tbase | tbase | 8192 bytes | tbase唯一索引 public | tbase_mc_idx | index | tbase | tbase | 8192 bytes | (3 rows) postgres=# \di+ *uidx--#只能在dn上面查看索引大小 List of relations Schema | Name | Type | Owner | Table | Size | Description --------+---------------+-------+-------+-------+------------+--------------- public | tbase_id_uidx | index | tbase | tbase | 8192 bytes | tbase唯一索引 (1 row)