20181218-PostgreSQL數據庫Extension管理

注意：在集群的一個數據庫中安裝擴展，在集群的另一個數據庫要使用的話，仍需安裝

1. 查看當前已安裝Extension

postgres=# \dx
List of installed extensions
Name | Version | Schema | Description
---------+---------+------------+------------------------------
plpgsql | 1.0 | pg_catalog | PL/pgSQL procedural language
(1 row)

2. 查看當前服務器可用的Extension擴展列表

postgres=# select name from pg_available_extensions;
name
--------------------
adminpack
seg
autoinc
dict_xsyn
pg_prewarm
ltree
ltree_plpython2u
bloom
pg_stat_statements
...

3. 安裝可用的Extension擴展,查看驗證

postgres=# create extension pg_stat_statements ;
CREATE EXTENSION
postgres=# \dx
List of installed extensions
Name | Version | Schema | Descr
iption
--------------------+---------+------------+-----------------------------
------------------------------
pg_stat_statements | 1.5 | public | track execution statistics o
f all SQL statements executed
plpgsql | 1.0 | pg_catalog | PL/pgSQL procedural language
(2 rows)

4. 刪除Extension擴展，查看驗證

postgres=# drop extension pg_stat_statements ;
DROP EXTENSION
postgres=# \x
Expanded display is on.
postgres=# \dx
List of installed extensions
-[ RECORD 1 ]-----------------------------
Name | plpgsql
Version | 1.0
Schema | pg_catalog
Description | PL/pgSQL procedural language