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DB2 SQL文執(zhí)行計(jì)劃監(jiān)控是DB2數(shù)據(jù)庫(kù)監(jiān)控的重要組成部分，下面就讓我們來(lái)了解一下什么是DB2 SQL文執(zhí)行計(jì)劃監(jiān)控。
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靜態(tài)的sql文執(zhí)行計(jì)劃存放在系統(tǒng)的catalog表中，動(dòng)態(tài)sql文的執(zhí)行計(jì)劃存放在global package cache。
如果要使用explain工具，首先要?jiǎng)?chuàng)建相關(guān)的表，建表腳本在/misc/EXPLAIN.DDL，只要運(yùn)行過(guò)一次explain GUI工具，將自動(dòng)創(chuàng)建這些表。
explain特定注冊(cè)器類型：
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.
設(shè)置explain特定注冊(cè)器類型：
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.
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