Cursor Pin S Wait On X

Unnecessary "Cursor:pin S wait on X" waits. For example, if there is no obvious candidate SQL in AWR, capturing holder or waiter processes in systemstate allows you to focus in on potential problems. Practical Troubleshooting. Determine the SQL statement involved in the problem. 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. AND t. sql_id = s. Pin s wait on x. sql_id. 1 Troubleshooting: High Version Count Issues. There may be underlying tuning requirements or known issues. 5) servers were high. Session 1226 is further blocked by session 1796. How to diagnose the cause. So let's see if we can walk through an example to determine the cause of the problem.

SQL ordered by Parse Calls whether the SQL parsing execution in this section is too high or can be reduced. V$SGA_RESIZE_OPS displays information about the last 800 completed SGA resize operations. This event can be easily seen on single-instance databases as well. Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Inst |IN-OUT| ---------------------------------------------------------------------------------------------------------------------.......... | 6 | REMOTE | ABC_CONFIG_VW | 1 | 39 | 2 (0)| 00:00:01 | MATRIX | R->S |.......... 许多文章都是从书本获取,并非自己原创,为了自己更好的记忆和学习,如果涉及版权,请说明,我会删除。. A Free Trial That Lets You Build Big! I have a domain that i set up all users on. DEFAULT buffer cache SHRINK 17, 632, 854, 016 10/06/2008 06:47:43. A Bug may cause the cursor pin s wait on x: |.

Run system state when processes appear hung on 'Cursor: pin S wait on X' waits: sqlplus "/ as sysdba". 1 Understanding and Tuning the Shared Pool. Select p1, p2raw, count(*) from v$session where event = 'cursor: pin S wait on X' and wait_time = 0 group by p1, p2raw; p1 –> Mutex Id. Troubleshooting Other Issues. Node 2 and 3 showed ~500 sessions on each node waiting on Cursor: pin S wait on X event. A spike in "cursor: pin S wait on X" or "library cache lock" waits may be seen.

Mutex deadlock have SQL baselines on recursive dictionary cursor. QC blocked/parse hang for parallel DML executed from remote stored procedure. DEFAULT buffer cache SHRINK 17, 548, 967, 936 10/06/2008 07:56:28. shared pool GROW 2, 197, 815, 296 10/06/2008 07:56:28. See details of these sections: ' Sqlordered by Parse Calls ' or ' SQL ordered by Version Count '. Operational Cost Reduction. Oracle Base - Literals, Substitution Variables and Bind Variables. Use V$sql_shared_cursor to find out why SQL cannot be shared.

There are some notable bugs where high version counts have been a factor: Document 10157392. Join gv$sqlarea sa2. So I needed to get the bottom of this. The first thing to note is that the mutex is only within. Parse Calls Executions% Total Parses SQL Id SQL Module SQL Text. Is this because the laptop needs this account to g... Long parse time for large inlists-can cause ' cursor:pin S wait on X ' waits. For single-instance databases, the query above will still work.

Assuming you can identify a blocker, taking errorstacks will provide much the same information as systemstates but with a much reduced disk footprint for trace. Cursor:pin S wait on X ' waits for invalid SQL over DB link. Jobs don ' t execute per schedule with a large number of PDBs. Many child cursors using Adaptive Cursor sharing with binds (due to bind_equiv_failure). 1 WAITEVENT: "cursor: pin S wait on X" Reference Note. Gc cr/current block 2/3-way. SQL> select p2raw from v$session where event = 'cursor: pin S wait on X'; P2RAW. 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! " Mmon deadlock with user session executing ALTER user. I have staff that also have laptops that they log in remotely from.

DEFAULT buffer cache GROW 306. Cursor: Pin S Wait On X and library cache lock Wait Event Solution. A cursor wait is associated with parsing in some form. FREQUENT RESIZE OF SGA.

The following output: INST BLOCKED_SID BLOCKED_USER BLOCKED_SQL_ID BLOCKING_SID BLOCKING_USER BLOCKING_SQL_ID. 1 Troubleshooting Performance Issues. Most of the ones that I have seen are fixed in 11. For Oracle RAC, the output from this query will show which instance is having the problem. "_memory_broker_stat_interval" is in seconds and is by default 30 seconds.

Only Statements with Version Count greater than 20 are displayed. If 'cursor: pin S wait on X' is seen after upgrade from 11g to 12c, please review following note: Document 1949691. SQL ordered by Parse Calls. For 30% off directly from the publisher. The event comes and goes, but I do see it from time to time. Above we can see Cursor: pin S wait on X was dominating. But it can't be parsed because another session is holding on to the same mutex. To view full details, sign in with your My Oracle Support account. Oradebug dump systemstate 258. wait 90 seconds. The most difficult RAC performance and tuning issues. Group by component, oper_type; COMPONENT OPER_TYPE COUNT(1).

Receive related timeout symptoms such as "WAITED TOO LONG FOR A ROW. Welcome to the Snap! 277 392, 737 30d5a6v16mpb select FLOW_CONTEXT (... 78 131, 104 7c0gj35488xs INSERT INTO PROJECT (DOC_ID,... From this list, investigate the SQLs with the high version count. Order by 1; KGH: NO ACCESS chunks are owned by the buffer cache and indicate a partial transfer between buffer cache and shared pool. This does not include in-progress operations. 76 gpkdazvcfwkv select DATA_TABLE (... 667, 440 668, 234 22. High CPU in Qcthasfakebind (can cause ' cursor:pin S wait on X ' waits).

8 Bug 9689310-excessive child Cursors/high version_count/oeri:17059 due to bind mismatch. Library Cache Lock Waits if long running TRUNCATE in progress. For example for 2 minutes) during the time the problem was seen. Please also provide a list of the current patches applied to the Oracle Home (command: opatch lsinventory -detail), in order that conflicts with existing patches may be checked.

Notice that all three sessions are issuing the same query with SQL ID cn7m7t6y5h77g. Oracle Database Cloud Exadata Service - Version N/A and later. But as is the case with many areas of the Shared Pool, Oracle is now using mutexes. PQ hang/deadlock Possible-"Cursor:pin S wait on X" waits. What causes 'Cursor: pin S wait on X' waits? So we'll send this back to development and dig into the application code. Lets find the sqlids. If the number of versions were low and excessive.