GET_DATA_COLLECTOR_POLICY
检索与指定组件的保留政策有关的简短声明。
这是元函数。您必须在顶级 SELECT 语句中调用元函数。
行为类型
易变语法
GET_DATA_COLLECTOR_POLICY( 'component' )
参数
- component
- 返回指定组件的保留策略。
查询系统表 DATA_COLLECTOR 的组件名称。例如:
=> SELECT DISTINCT component, description FROM data_collector WHERE component ilike '%Depot%' ORDER BY component; component | description ----------------+------------------------------- DepotEvictions | Files evicted from the Depot DepotFetches | Files fetched to the Depot DepotUploads | Files Uploaded from the Depot (3 rows)
特权
无
示例
以下查询通过指定 ResourceAcquisitions
组件返回所有资源获取的历史记录。
=> SELECT get_data_collector_policy('ResourceAcquisitions');
get_data_collector_policy
----------------------------------------------
1000KB kept in memory, 10000KB kept on disk.
(1 row)