DB2 SQL文执行计划监控是DB2数据库监控的重要组成部分，下面就让我们来了解一下什么是DB2 SQL文执行计划监控。

静态的sql文执行计划存放在系统的catalog表中，动态sql文的执行计划存放在global package cache。
如果要使用explain工具，首先要创建相关的表，建表脚本在/misc/EXPLAIN.DDL，只要运行过一次explain GUI工具，将自动创建这些表。

explain特定注册器类型：
CURRENT EXPLAIN MODE - Used to populate only the explain data. No snapshot will be taken.
CURRENT EXPLAIN SNAPSHOT - Used to capture only the explain snapshot data.

设置explain特定注册器类型：
SET CURRENT EXPLAIN MODE option
SET CURRENT EXPLAIN SNAPSHOT option
The explain registers options are:
NO - No explain information is captured for dynamic SQL statements.
YES - Explain tables or snapshot information will be populated for dynamic SQL statements while executing the SQL statement, and the result is returned.
EXPLAIN - Explain tables or snapshot information will be populated for dynamic SQL statements without executing the SQL statement. Use this state to obtain explain information without executing the SQL statement.

【编辑推荐】

DB2 SQL脚本批量执行的实现过程

DB2在线导出的方法

db2存储过程常用语句

DB2 CREATE SERVER语句的用法

常用的DB2管理命令