How to find resulting sql ' enq: TX - line lock conflict.

Hello

In one of our database we still find "enq: TX - line lock conflict" for 2-3 days. But then he stopped. Time it happened he blocked other sessions for a long while and he got is resolved automatically. Now the ADDM report, we have sql queries that has waited for this but, we cannot find that question of what module caused the outcome. What I should look for that, beyond the information. Help, please.

Database is 10 gr 2 on AIX.

Kind regards
Chaouki

Hello
Have you tried querying DBA_HIST_ACTIVE_SESS_HISTORY with event WHERE as "enq: TX %' ?" This should return the lines for the duration of that event (hold/lock) was underway. See column BLOCKING_SESSION which will tell you the session ID that blocked and caused this wait event/lock.

Now again ask DBA_HIST_ACTIVE_SESS_HISTORY with session_id = .

Here, you should see SQLs executed by this session "blocking". Take this list of SQLs and use v$ sql or AWR report using the awrsqrpt.sql script to see the details of each of these SQLs and this should help you find SQL blocking. DBA_HIST_ACTIVE_SESS_HISTORY also shows the module where this session/sql has been executed.

Salman

Tags: Database

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