Long parse time for large query with many nested views due to much time in epxression analysis code. 1 Troubleshooting: High Version Count Issues. In a fast-running system, those holders and waiter processes are fleeting. The problem will happen randomly and intermittently. 1 How to Determine the Blocking Session for Event: 'cursor: pin S wait on X'. Oradebug -g all hanganalyze 4. oradebug -g all dump systemstate 258.
Mutex self deadlock on explain/trace of remote mapped SQL. This is actively resizing he shared pool. Cursor: pin S wait on X — A session waits for this event when it is requesting a shared mutex pin and another session is holding an exclusive mutex pin on the same cursor object. The one with the problem is the main computer they use. The following output: INST BLOCKED_SID BLOCKED_USER BLOCKED_SQL_ID BLOCKING_SID BLOCKING_USER BLOCKING_SQL_ID. To do that, I used the following query: select st_id as inst, as blocked_sid, ername as blocked_user, sa. This event can be easily seen on single-instance databases as well. Can this be addressed? 0000001F00000000 31. There are some notable bugs where high version counts have been a factor: Document 10157392. Errorstacks: Another way to obtain process information is with errorstack. One cannot seem to get the scans while the other works completely fine.
I have staff that also have laptops that they log in remotely from. Over-parsing the query. If this article doesn't have the information you need you can try searching online. This is more likely to be seen in an OLTP environment where both shared pool and buffer cache are in demand. But that isn't our problem today so we proceed. Oracle RAC Performance tuning, a book that provides real world advice for resolving. Hang/deadlock between "Cursor:pin S wait on X" and "Library cache lock" involving dictionary objects. The session with single-task messgae had a logon time of ~100hrs and the sqls indicated some dblink operation. Any of the "cursor:" waits are bottlenecks in the Shared Pool in the SQL Area. In a future blog post, I will discuss queries with high number of versions in the SQL Area. DEFAULT buffer cache SHRINK 94. shared pool SHRINK 306. A cursor wait is associated with parsing in some form.
8 - Bug 6528336 - Automatic SGA may repeatedly shrink / grow the shared pool. The first thing to note is that the mutex is only within that instance for Oracle RAC databases. FROM v$session s, v$sql t. WHERE LIKE '%cursor: pin S wait on X%'. This does not include in-progress operations. Practical Troubleshooting. Where event ='cursor: pin S wait on X'. From v$session where SID=31; As a result of Bug 7568642 BLOCKING_SESSION EMPTY FOR "CURSOR: PIN S WAIT ON X" the blocking_session is not populated in bug is fixed in 11g R1.
To check which session is holding the exclusive lock on the mutex –. Oradebug dump errorstack 3. 8 - Bug 9267837 - Auto-SGA policy may see larger resizes than needed. Sql_id as blocked_sql_id, trunc(s. p2/4294967296) as blocking_sid, ername as blocking_user, b. sql_id as blocking_sql_id from gv$session s join gv$sqlarea sa on sa. Cursor:pin S wait on X ' waits for invalid SQL over DB link. Library cache Lock/cursor:pin S wait on X with parallel partition stats gathering. The application is over-parsing the query. DEFAULT buffer cache SHRINK 17, 616, 076, 800 10/06/2008 06:47:44. shared pool GROW 2, 147, 483, 648 10/06/2008 06:47:44. shared pool GROW 2, 130, 706, 432 10/06/2008 06:47:44.
Column Final format 99, 999, 999, 999. column Started format A25. Bing Search for oracle - cursor: pin S wait on X. Sometimes system state dump is necessary to match known issues. Join gv$session b. on trunc(s. p2/4294967296). Join gv$sqlarea sa2. Also remember if the shared pool is flushed, then sqls will need to be hard parsed. Killing these active session with wait event "single-task message" reduced the active session count wait from 500 to ~5 on each node which in turn also reduced the CPU utilization. Modern Application Management. This book includes scripts and tools to hypercharge Oracle 11g. Bonus Flashback: March 10, 2006: Mars Reconnaissance Orbiter Reaches Red Planet (Read more HERE. ) SQL ordered by Parse Calls. Hang/deadlock from ANALYZE of cluster index.
Notice that all three sessions are issuing the same. In extreme examples the database can appear to hang and you may receive related timeout symptoms such as "WAITED TOO LONG FOR A ROW CACHE ENQUEUE LOCK! " SQL ordered by Version Count for the high Version SQL in this section, you need to find out why they cannot be shared and can be found by V$sql_shared_cursor view. 1 WAITEVENT: "cursor: pin S wait on X" Reference Note. The system SQL parsing can be initially judged based on the contents of the load profile of the AWR: If you see a lot of hard parses, the system may not be using binding variables, or there will be new SQL on-line. Issues can also be caused by automatic shared memory management or setting the parallel query paramter. Recently we had faced an issue where the CPU utilization on 3-node RAC (10. 8 Bug 9689310-excessive child Cursors/high version_count/oeri:17059 due to bind mismatch.
1 Formated V$SQL_SHARED_CURSOR Report by SQLID or Hash Value. The cause of the problem. Flashback: March 10, 2000: Dot-Com Bubble Peaks (Read more HERE. ) Most of the ones that I have seen are fixed in 11. In extreme examples the database can appear to hang and you may. SQL> oradebug setospid < from above>. Following parameter cna be set dynamically: alter system set "_memory_broker_stat_interval"=999; This will increase the time between resize to at least 999 seconds and thereby reducing the number of resize operations.
FROM V$SGA_RESIZE_OPS. Oradebug dump systemstate 258. wait 90 seconds. The problem is that, I need to find a way to deploy this without having to restart the computer. I ended up getting a job offer at a small MSP, they are around 10 or so techs, and t... If Patch 9267837 is not available for your 11g version and platform, log a new Service Request so that a One-Off Back-port request can be created for you.
APPLIES TO:Oracle Database - Enterprise Edition - Version 10. V$SGA_RESIZE_OPS displays information about the last 800 completed SGA resize operations. Note: The bug fix is included in 11. Start building with 50+ products and up to 12 months usage for Elastic Compute Service.
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