Virtual Memory Consumption / Paging under AIX 7.1
(Doc ID 1666458.1)
Last updated on APRIL 04, 2023
Applies to:
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and laterOracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Database Cloud Service - Version N/A and later
IBM AIX on POWER Systems (64-bit)
Symptoms
After an upgrade from AIX 5.3 to AIX 7.1, an increase of virtual memory consumption and paging activity is noticed.
All the points were checked as mentioned in
<Note 1599824.1> - AIX: ORA-4030 Error or High Swap Usage
Moreover, the system has installed IBM interim patch "IV21116m04" that must be present in the system and numperm_global kernel system parameter is set to 0.
Depending on the system, the consumption of virtual memory could be around 1GB per day.
To monitor the system, next commands can be used:
The output for svmon shows that the increase of memory always under clnt text data BSS heap and this heap is growing, e.g.:
****svmon -P 46923876 ------------------------------------------------------------------------------- Pid Command Inuse Pin Pgsp Virtual 64-bit Mthrd 16MB 46923876 oracle 717155 538496 0 647214 Y N Y PageSize Inuse Pin Pgsp Virtual s 4 KB 82227 0 0 12286 m 64 KB 6659 632 0 6659 L 16 MB 129 129 0 129 S 16 GB 0 0 0 0 Vsid Esid Type Description PSize Inuse Pin Pgsp Virtual 8b0d4b 10 clnt text data BSS heap, s 69593 0 - - /dev/test112030:127361 822c01 7000000a work default shmat/mmap L 16 16 0 16 bb2338 70000009 work default shmat/mmap L 16 16 0 16 b741b7 70000005 work default shmat/mmap L 16 16 0 16 93fb10 70000008 work default shmat/mmap L 16 16 0 16 b022b0 70000007 work default shmat/mmap L 16 16 0 16 b00bb4 70000006 work default shmat/mmap L 16 16 0 16 990e59 70000004 work default shmat/mmap L 16 16 0 16 ac02af 7000000b work default shmat/mmap L 15 15 0 15 9b001b 90000000 work shared library text m 2746 0 0 2746 ae062e 90000001 work shared library text m 2704 0 0 2704 20002 0 work kernel segment m 683 629 0 683 8e1a0e 90000002 work shared library text m 521 0 0 521 9d001d 90020014 work shared library s 6264 0 0 6264 a01724 7000000c work default shmat/mmap L 1 1 0 1 9e0d9a 70000000 work default shmat/mmap L 1 1 0 1 50005 9ffffffd work shared library sm 3246 0 0 3246 b6f675 11 work text data BSS heap sm 2507 0 0 2507 b721b7 - pers /dev/test1:625034 s 314 0 - - a51ba7 9001000a work shared library data sm 128 0 0 128 e000e 9ffffffe work shared library sm 87 0 0 87 b0f633 f00000002 work process private m 5 3 0 5 a9062d 80020014 work USLA heap sm 24 0 0 24 850185 9fffffff clnt USLA text,/dev/hd2:4160 s 20 0 - - b60a32 ffffffff work application stack sm 19 0 0 19 aa0fea - clnt /dev/test112030:127212 s 10 0 - - b26ff2 8fffffff work private load data s 8 0 0 8 9d575d 8001000a work private load data sm 3 0 0 3 9406d4 - clnt /dev/hd2:84982 s 2 0 - - 8a0cca - clnt /dev/test112030:127232 s 1 0 - - 990bd9 - clnt /dev/test112030:41195 s 1 0 - - 93dc10 a0000000 mmap maps 1 source(s) sm 0 0 - - Fin captura: 20140423_063001 **********************************************************************************************
Changes
Upgrade to AIX 7100-03.
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |