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Short Hangs waiting for Enq: CT - CTWR Large Concurrency Wait Event (Doc ID 2601295.1)

Last updated on DECEMBER 23, 2019

Applies to:

Oracle Database - Enterprise Edition - Version 12.1.0.2 and later
Information in this document applies to any platform.

Symptoms

We are experiencing hangs and waits on enq: CT - CTWR process start/stop and block change tracking buffer space in event after enabling block change tracking.

CTWR Memory Information:

SQL> SELECT status FROM v$block_change_tracking;

STATUS
----------
ENABLED

SQL> SELECT * FROM v$sgastat
         WHERE name like 'CTWR%';

POOL NAME BYTES CON_ID
------------ -------------------------- ---------- ----------
large pool CTWR dba buffer 268419072 0

SQL> show parameter large

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
large_pool_size big integer 10G
use_large_pages string ONLY


SQL> select dba_buffer_count_public*dba_entry_count_public*dba_entry_size from X$KRCSTAT;

DBA_BUFFER_COUNT_PUBLIC*DBA_ENTRY_COUNT_PUBLIC*DBA_ENTRY_SIZE
-------------------------------------------------------------
  268418880

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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