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LMS not running in RT (real time) mode in 10.2.0.3 RAC database (Doc ID 602419.1)

Last updated on AUGUST 04, 2018

Applies to:

Oracle Database - Enterprise Edition - Version 10.2.0.3 and later
Oracle Solaris on SPARC (64-bit)

Symptoms

In Oracle RAC 10g Release 2, we now 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:

grid-t4:/home/oracle =>ps -efc | grep lms
oracle 20164 1 TS 59 Apr 06 ? 196:00 ora_lms1_FM89INT4
oracle 20224 1 TS 59 Apr 06 ? 156:10 ora_lms1_FM89TRN4
oracle 5079 1 TS 59 Apr 27 ? 79:51 ora_lms1_EPM9TST4
oracle 21136 1 TS 59 May 19 ? 31:23 ora_lms0_FM89UAT4
oracle 14420 1 TS 59 Apr 17 ? 112:26 ora_lms0_EPM9UAT4
oracle 25510 1 TS 59 May 21 ? 25:49 ora_lms1_FAMXUAT4
oracle 20841 1 TS 59 Apr 06 ? 150:24 ora_lms0_FM89TST4
oracle 7895 1 TS 59 Jun 04 ? 2:39 ora_lms1_FM89DEL4
oracle 4780 1 TS 59 Apr 28 ? 72:07 ora_lms1_IEI10CFG4
oracle 5074 1 TS 59 Apr 27 ? 79:13 ora_lms0_EPM9TST4
oracle 21149 1 TS 59 May 19 ? 31:25 ora_lms1_FM89UAT4
oracle 25506 1 TS 59 May 21 ? 25:53 ora_lms0_FAMXUAT4
oracle 20131 1 TS 59 Apr 06 ? 207:42 ora_lms0_FM89INT4
oracle 4776 1 TS 59 Apr 28 ? 71:12 ora_lms0_IEI10CFG4
oracle 8264 1 RT 100 Apr 06 ? 2491:53 asm_lms0_+ASM4 


Another example of LMS in RT:

grid-t2:/home/oracle =>ps -efc | grep lms
oracle 18098 1 RT 100 May 23 ? 39:30 ora_lms1_IEI10TRN2
oracle 14029 1 RT 100 Jun 05 ? 3:04 ora_lms1_FM89CNV2
oracle 2384 1 RT 100 May 23 ? 744:03 asm_lms0_+ASM2
oracle 17165 1 RT 100 May 23 ? 39:45 ora_lms1_EPM9DMO2
oracle 16491 1 RT 100 Jun 04 ? 5:01 ora_lms0_FAMXINT2
oracle 18094 1 RT 100 May 23 ? 39:31 ora_lms0_IEI10TRN2
oracle 7330 1 RT 100 May 23 ? 41:58 ora_lms1_DWRTRN2
oracle 7318 1 RT 100 May 23 ? 41:38 ora_lms0_DWRTRN2
oracle 7394 1 RT 100 May 23 ? 42:23 ora_lms0_FM89UNT2
oracle 16495 1 RT 100 Jun 04 ? 5:03 ora_lms1_FAMXINT2
oracle 7408 1 RT 100 May 23 ? 42:23 ora_lms1_FM89UNT2
oracle 14024 1 RT 100 Jun 05 ? 3:04 ora_lms0_FM89CNV2
oracle 17160 1 RT 100 May 23 ? 40:00 ora_lms0_EPM9DMO2
oracle 21279 1 RT 100 May 23 ? 39:45 ora_lms1_FAMXSBX2
oracle 21275 1 RT 100 May 23 ? 39:45 ora_lms0_FAMXSBX2
oracle 245 1 RT 100 Jun 01 ? 14:06 ora_lms0_EPM9DEV2
oracle 250 1 RT 100 Jun 01 ? 14:03 ora_lms1_EPM9DEV2
oracle 13436 1 RT 100 Jun 03 ? 8:58 ora_lms0_IEI10TST2

Changes

 

Cause

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