LMS not running in RT (real time) mode in 10.2.0.3 RAC database
(Doc ID 602419.1)
Last updated on FEBRUARY 22, 2019
Applies to:
Oracle Database - Enterprise Edition - Version 10.2.0.3 and laterOracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Solaris on SPARC (64-bit)
Symptoms
In Oracle RAC 10g Release 2, we set the operating system scheduling priority of the LMS processes for a RAC database to the Real Time (RT) class. In previous versions LMS processes ran in the Time Sharing (TS) class.
The database parameters that set LMS priority look correct:
Parameter Description SessVal InsVal
-------------------------- -------------------------------- -------- --------
_high_priority_processes High Priority Process Name Mask LMS* LMS*
_os_sched_high_priority OS high priority level 1 1
However, from the ps command output you notice that LMS process is not running in RT (Real-Time) as shown below:
Example of LMS running in TS:
<USER>:/<DIR> =>ps -efc | grep lms
<oracle> 20164 1 TS 59 Apr 06 ? 196:00 ora_lms1_<SID1>
<oracle> 20224 1 TS 59 Apr 06 ? 156:10 ora_lms1_<SID2>
<oracle> 5079 1 TS 59 Apr 27 ? 79:51 ora_lms1_<SID3>
<oracle> 21136 1 TS 59 May 19 ? 31:23 ora_lms0_<SID4>
<oracle> 14420 1 TS 59 Apr 17 ? 112:26 ora_lms0_<SID5>
<oracle> 5074 1 TS 59 Apr 27 ? 79:13 ora_lms0_<SID3>
<oracle> 21149 1 TS 59 May 19 ? 31:25 ora_lms1_<SID4>
<oracle> 20131 1 TS 59 Apr 06 ? 207:42 ora_lms0_<SID1>
<oracle> 8264 1 RT 100 Apr 06 ? 2491:53 asm_lms0_+ASM4
Another example of LMS in RT:
<USER>:/<DIR> =>ps -efc | grep lms
<oracle> 18098 1 RT 100 May 23 ? 39:30 ora_lms1_<SID1>
<oracle> 14029 1 RT 100 Jun 05 ? 3:04 ora_lms1_<SID2>
<oracle> 2384 1 RT 100 May 23 ? 744:03 asm_lms0_+ASM2
<oracle> 17165 1 RT 100 May 23 ? 39:45 ora_lms1_<SID3>
<oracle> 16491 1 RT 100 Jun 04 ? 5:01 ora_lms0_<SID4>
<oracle> 18094 1 RT 100 May 23 ? 39:31 ora_lms0_<SID1>
<oracle> 7330 1 RT 100 May 23 ? 41:58 ora_lms1_<SID5>
<oracle> 7318 1 RT 100 May 23 ? 41:38 ora_lms0_<SID5>
<oracle> 16495 1 RT 100 Jun 04 ? 5:03 ora_lms1_<SID4>
<oracle> 14024 1 RT 100 Jun 05 ? 3:04 ora_lms0_<SID2>
<oracle> 17160 1 RT 100 May 23 ? 40:00 ora_lms0_<SID3>
Cause
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In this Document
| Symptoms |
| Cause |
| Solution |
| References |