PROFILE
分析单个 SQL 语句。
语法
PROFILE { sql-statement }
参数
输出
将分析摘要写入 stderr,将详细信息保存至系统编录
V_MONITOR.EXECUTION_ENGINE_PROFILES
。
特权
需要相同的权限运行已分析的语句
描述
PROFILE
生成关于目标语句执行的详细信息,并将其保存在系统编录
V_MONITOR.EXECUTION_ENGINE_PROFILES
中。查询输出通过分析总结执行:分析标识符 transaction_id
和 statement_id
、启动程序的查询内存以及需要的总内存。例如:
=> PROFILE SELECT customer_name, annual_income FROM public.customer_dimension WHERE (customer_gender, annual_income) IN (SELECT customer_gender, MAX(annual_income) FROM public.customer_dimension GROUP BY customer_gender);
NOTICE 4788: Statement is being profiled
HINT: Select * from v_monitor.execution_engine_profiles where transaction_id=45035996274683334 and statement_id=7;
NOTICE 3557: Initiator memory for query: [on pool general: 708421 KB, minimum: 554324 KB]
NOTICE 5077: Total memory required by query: [708421 KB]
customer_name | annual_income
------------------+---------------
Emily G. Vogel | 999998
James M. McNulty | 999979
(2 rows)
使用分析标识符在给定的查询中查询分析信息的表。