ALTER DATABASE database_name SET configuration_parameter = value; In the subsequent sessions, PostgreSQL will override the settings in the postgresql.conf file. Only superusers or database owners can change the session default for a run-time configuration for the database. PostgreSQL ALTER DATABAS...
ALTER DATABASEis used to change the attributes of a database. The first two forms change the session default of a run-time configuration variable for a PostgreSQL database. Whenever a new session is subsequently started in that database, the specified value becomes the session default value. T...
The REFRESH_INTERVAL clause sets the approximate time interval, in seconds, to refresh data from the zero-ETL source to the target database. The interval can be set 0–432,000 seconds (5 days) for zero-ETL integrations whose source type is Aurora MySQL, Aurora PostgreSQL, or RDS for MySQL...
View(视图)是一张假表,只不过是通过相关的名称存储在数据库中的一个 PostgreSQL 语句。 View(视图)实际上是一个以预定义的 PostgreSQL 查询形式存在的表的组合。 View(视图)可以包含一个表的所有行或从一个或多个表选定行。 View(视图)可以从一个或多个表创建,这取决于要创建视图的 PostgreSQL 查询。 View(...
If you use a role to log in to the PostgreSQL database server and rename it in the current session, you will get an error: ERROR: session user cannot be renamed In this case, you need to connect to the PostgreSQL database server using a different role to rename that role. You execute...
Whenever a new session is subsequently started in that database, the specified value becomes the session default value. The database-specific default overrides whatever setting is present in postgresql.conf or has been received from the postgres command line. Only the database owner or a super...
1、alter database:修改的是与数据库相关的一些参数或设置, 在实例重新启动后, 这些修改依然有效.因为...
RoleSpec *role;/* role */char*database;/* database name, or NULL */VariableSetStmt *setstmt;/* SET or RESET subcommand */} AlterRoleSetStmt; NodeTag type: 用于标识节点的类型。这是一个通用字段,能帮助 PostgreSQL 识别语法树中的各种节点类型。
InPostgreSQL, the“ALTER TABLE”command can be used along with the“ALTER COLUMN”and“TYPE”clauses to modify the data type of a column: ALTER TABLE tbl_name ALTER COLUMN col_name TYPE data_type; In the above syntax,tbl_namerepresents the table name,col_nameis the column to be altered...
当前数据库在一个表空间中的所有表可以用ALL IN TABLESPACE形式移动,这将会首先锁住所有将被移动的表然后逐个移动。这种形式也支持 OWNED BY,它将只移动指定角色所拥有的表。如果指定了NOWAIT选项,则命令将在无法立刻获得所有所需要的锁时失败。注意这个命令不移动系统目录;如果想要移动系统目录,应该用ALTER DATABASE或...