How to diagnose cursor pin s wait on x Series 2, cursorpin

How to diagnose cursor pin s wait on x Series 2, cursorpin

How to analyze diagnostic collection information

1. view the content of high paring and high version in the AWR report.

 

For more information, see 'sqlordered by Parse call' or 'SQL ordered by Version count'

 

 

SQL ordered by Parse CILSWhether the SQL parsing execution in this section is too high or whether it can be reduced.

SQL ordered by Version CountFor the high version SQL in this section, you need to find out why they cannot be shared. You can use the v $ SQL _shared_cursor view to find the cause.

 

2. systemstats and errorstack considerations

It is very important for systemstats and errorstack timeliness. Dump must be performed when the problem occurs. Otherwise, the information collected out of date is invalid. In a high-speed operating system, those holders and waiter processes are transient.

 

 

Based on the load profile of AWR, You Can preliminarily determine the system SQL parsing status:

If you see a lot of hard parses, it indicates that the system may not use the bound variable, or there is a new SQL online.

 

For high version counts, it will also cause cursor: ping S wait on X

Use V $ SQL _SHARED_CURSOR to find out why SQL cannot be shared.

Some bugs may cause high version counts:

Document 1057392.8 Bug 10157392-High version counts forSQL with binds (BIND_MISMATCH)
Document 9689310.8 Bug 9689310-Excessive child cursors/high VERSION_COUNT/OERI: 17059 due to bind mismatch

 

 

The Bug may cause cursor pin s wait on x:

NB	Bug	Fixed	Description
5650841	Hang/deadlock from ANALYZE of cluster index
16191248	12.1.0.1.1, 12.1.0.2, 12.2.0.0	Hang from concurrent drop of on-commit materialized views or using DBMS_REDEFINITION
14295250	11.2.0.4, 12.1.0.1	Long parse time for large query with nested views due to much time in epxression analysis code
14191508	11.2.0.3.8, 11.2.0.3.BP16, 11.2.0.4, 12.1.0.1	Slow row cache load due to SEG $ and INDSUBPART $ queries
14176247	11.2.0.4, 12.1.0.1	Using child cursors using Adaptive Cursor Sharing with binds (due to BIND_EQUIV_FAILURE)
18292893	12.1.0.2, 12.2.0.0	Jobs don't execute per schedule with a large number of PDBs
18018515	12.2.0.0	High CPU in qctHasFakeBind (can cause 'cursor: pin S wait on X 'waits)
16448569	11.2.0.4, 12.1.0.2, 12.2.0.0	PQ hang/deadlock possible-"cursor: pin S wait on X" waits
16400122	12.2.0.0	Spikes in library cache mutex contention for SQL using SQL Plan Baseline
15850031	11.2.0.4, 12.2.0.0	Rare instance hang: deadlock between 'row cache lock' and 'cursor: pin S wait for x'
14469756	12.2.0.0	Partition pruning causes delay in TBL $ OR $ IDX $ PART $ NUM
14302813	11.2.0.4, 12.2.0.0	QC blocked/parse hang for parallel DML executed from remote stored procedure
14029891	11.2.0.4, 12.1.0.1	Mutex deadlock having SQL baselines on recursive dictionary cursor
11927619	11.2.0.1.BP11, 11.2.0.2.BP07, 11.2.0.3, 12.1.0.1	DBMS_STATS slow on interval composite partitions
11855965	11.2.0.3, 12.1.0.1	Truncate partition takes long time doing recursive delete on MLOG $
10213073	11.2.0.2.8, 11.2.0.2.BP18, 11.2.0.3, 12.1.0.1	Create synonym and create package may incorrectly invalidate objects
10171273	11.2.0.2.8, 11.2.0.2.BP08, 11.2.0.3, 12.1.0.1	Long parse time with non-equi subpartitioning under interval partitioning
9944129	11.2.0.1.BP12, 11.2.0.2, 12.1.0.1	SQL not shared due to INST_DRTLD_MISMATCH with global transaction
9935787	11.2.0.3, 12.1.0.1	Long parse time for large inlists-can cause 'cursor: pin S wait on X 'waits
9694101	10.2.0.5.7, 11.2.0.2, 12.1.0.1	Hang/deadlock between "cursor: pin S wait on X" and "library cache lock" involving dictionary objects
9499302	10.2.0.5.5, 11.1.0.7.7, 11.2.0.1.BP08, 11.2.0.2, 12.1.0.1	Improve concurrent mutex request handling
9472669	11.2.0.1.BP12, 11.2.0.2, 12.1.0.1	'Cursor: pin S wait on x' waits for invalid SQL over DB link
8508078	11.2.0.2, 12.1.0.1	Contention from begin concurrent bad SQLs-superseded
12432089	11.2.0.3	Library cache lock/cursor: pin S wait on X with parallel partition stats gathering
8441239	11.2.0.1	Library cache lock waits if long running TRUNCATE in progress
8348464	11.1.0.7.2, 11.2.0.1	Create synonym and create package may incorrectly invalidate objects
7234778	11.2.0.1	Unnecessary "cursor: pin S wait on X" waits
5485914	10.2.0.4	Mutex self deadlock on explain/trace of remote mapped SQL
6143420	10.2.0.5, 11.1.0.6	Deadlock involving "row cache lock" on dc_users AND "CURSOR: pin s wait on x"
6011045	10.2.0.5.5	DBMS_STATS causes deadlock between 'cursor: pin S wait on X' and 'library cache lock'
7462072	10.2.0.4.3, 10.2.0.5	Unnecessary "cursor: pin S wait on X" waits
5983020	10.2.0.4	MMON deadlock with user session executing ALTER USER
7226463	10.2.0.5	Execute immediate no releasing mutex or library cache pin
+	5907779	10.2.0.4	Self deadlock hang on "cursor: pin S wait on X" (typically from DBMS_STATS)