RE: [EXTERNAL] RE: AQ process waiting on "library cache: mutex X"

From: Hameed, Amir <amir.hameed_at_sleepnumber.com>
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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Received on Tue Jul 13 2021 - 18:18:39 CEST

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