v$SESSION是我们常用的动态性能视图之一,其SQL_ID字段常用来检测会话当前执行的SQL语句,但在少数版本中V$SESSION的SQL_ID列可能不正常地显示SQL_ID,一般是在Session Active或执行Pl/SQL的时候SQL_ID为NULL,以下是部分相关的部分BUG列表:  
BUG#Affected VersionSymptomFix Version
Bug 13068790 - the value of v$session.sql_id of active session is null [ID 13068790.8]11.2.0.2.4 Patch Set Update 11.2.0.2.3 Patch Set Update 11.2.0.2.1 Patch Set Update 11.2.0.2 11.2.0.1active session's sql_id, sql_address may be null or 0 out while a recursive call is executing.11.2.0.3 (Server Patch Set)
Bug 14393463 : IN V$SESSION, SQL_ID IS NOT NULL BUT STATUS IS INACTIVE11.2.0.3Abstract: IN V$SESSION, SQL_ID IS NOT NULL BUT STATUS IS INACTIVENo Workaround Now
Bug 11670241 : NULL V$SESSION.SQL_ID WHEN RUNNING SLOW SQL IN PL/SQL11.2.0.1In 11.2 (maybe also in 10g), when running a slow sql in pl/sql, we found that v$session.sql_id will be null.

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