RE: [EXTERNAL] RE: AQ process waiting on "library cache: mutex X"
Date: Tue, 13 Jul 2021 16:18:39 +0000
Message-ID: <CH0PR14MB50127CCFDD6FE651B21220CCE0149_at_CH0PR14MB5012.namprd14.prod.outlook.com>
Thanks Nenad. In my case, the USERNAME is NULL, and therefore, I used the following syntax. However, the output doesn't show any blocker unless I am reading it incorrectly.
_at_/tmp/ash_wait_chains.sql username||':'||program2||event2 session_type='BACKGROUND' sysdate-1/24 sysdate
%This SECONDS AAS #Blkrs WAIT_CHAIN FIRST_SEEN LAST_SEEN ------ ---------- ---------- ------ -------------------------------------------------------------------------------------------------------------- ------------------- ------------------- 90% 6071 1.7 4 -> SYS:(Qnnn) ON CPU 2021-07-13 10:13:37 2021-07-13 11:13:35 4% 271 .1 3 -> SYS:(Qnnn) library cache: mutex X 2021-07-13 10:13:36 2021-07-13 11:13:32 3% 221 .1 1 -> SYS:(LGWR) log file parallel write 2021-07-13 10:16:05 2021-07-13 11:13:24 1% 53 0 2 -> SYS:(Mnnn) ON CPU 2021-07-13 10:13:47 2021-07-13 11:13:28 1% 40 0 1 -> SYS:(Qnnn) library cache: mutex X -> SYS:(Qnnn) ON CPU 2021-07-13 10:14:02 2021-07-13 11:11:55 0% 23 0 1 -> SYS:(DIAn) ON CPU 2021-07-13 10:16:10 2021-07-13 11:11:57 0% 18 0 1 -> SYS:(DBWn) db file parallel write 2021-07-13 10:16:14 2021-07-13 11:12:17 0% 13 0 1 -> SYS:(LGWR) ON CPU 2021-07-13 10:19:02 2021-07-13 11:12:32 0% 9 0 1 -> SYS:(PSPn) ON CPU 2021-07-13 10:20:06 2021-07-13 11:12:26 0% 7 0 1 -> SYS:(DBWn) ON CPU 2021-07-13 10:16:02 2021-07-13 11:12:23 0% 6 0 1 -> SYS:(CKPT) control file parallel write 2021-07-13 10:23:02 2021-07-13 11:00:56 0% 5 0 5 -> SYS:(Mnnn) Disk file operations I/O 2021-07-13 10:31:16 2021-07-13 11:11:19 0% 4 0 1 -> SYS:(CKPT) control file sequential read 2021-07-13 10:22:56 2021-07-13 10:32:46 0% 4 0 1 -> SYS:(CJQn) os thread startup 2021-07-13 10:20:00 2021-07-13 11:12:26 0% 4 0 2 -> SYS:(Qnnn) Streams AQ: deallocate messages from Streams Pool 2021-07-13 10:16:39 2021-07-13 11:04:56 0% 3 0 1 -> SYS:(DBWn) db file async I/O submit 2021-07-13 10:16:05 2021-07-13 10:57:48 0% 2 0 1 -> SYS:(Mnnn) db file sequential read 2021-07-13 11:00:27 2021-07-13 11:00:28 0% 2 0 1 -> SYS:(CJQn) ON CPU 2021-07-13 10:41:01 2021-07-13 11:05:37 0% 2 0 1 -> SYS:(DBRM) ON CPU 2021-07-13 10:46:10 2021-07-13 11:10:00 0% 2 0 1 -> SYS:(SMON) ON CPU 2021-07-13 10:22:39 2021-07-13 10:32:02 0% 2 0 1 -> SYS:(LGWR) LGWR wait for redo copy -> APPS:(JDBC Thin Client) ON CPU 2021-07-13 10:27:09 2021-07-13 10:27:12 0% 1 0 1 -> SYS:(MMON) ON CPU 2021-07-13 10:17:21 2021-07-13 10:17:21 0% 1 0 1 -> SYS:(Mnnn) direct path write 2021-07-13 11:00:26 2021-07-13 11:00:26 0% 1 0 1 -> SYS:(Qnnn) db file sequential read 2021-07-13 10:29:15 2021-07-13 10:29:15 0% 1 0 1 -> SYS:(Mnnn) control file sequential read 2021-07-13 11:00:25 2021-07-13 11:00:25 0% 1 0 1 -> SYS:(QMNC) ON CPU 2021-07-13 11:08:45 2021-07-13 11:08:45 0% 1 0 1 -> SYS:(LGWR) LGWR wait for redo copy -> APPS:(frmweb) ON CPU 2021-07-13 10:32:02 2021-07-13 10:32:02 0% 1 0 1 -> SYS:(CKPT) ON CPU 2021-07-13 11:00:53 2021-07-13 11:00:53
From: Noveljic Nenad <nenad.noveljic_at_vontobel.com>
Sent: Tuesday, July 13, 2021 10:24 AM
To: Hameed, Amir <amir.hameed_at_sleepnumber.com>; oracle-l_at_freelists.org
Subject: [EXTERNAL] RE: AQ process waiting on "library cache: mutex X"
CAUTION: External source
HI Amir,
ash_wait_chains could highlight the root blocker.
Best regards,
Nenad
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