Database Memory & 4030/4031 (MOSC)

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Oracle 12.2 facing ORA-04031

edited Dec 18, 2019 4:06AM in Database Memory & 4030/4031 (MOSC) 6 commentsAnswered

Hello folks

I have a customer with following situation in place, since months ago.

Oracle 12.2.0.1.0 + DPBP JUL 2019

OS: Linux x86_64 OEL 6.7

Memory Parameters (at spfile):

SGA_MAX_SIZE=1650G (2TB on Host)

SGA_TARGET=1650G

INMEMORY_SIZE=1320G

DB_CACHE_SIZE=230G

SHARED_POOL_SIZE=16G

SHARED_POOL_RESERVED_SIZE=7065M

Other, could be, relevant parameters:

CURSOR_SHARING=EXACT

CURSOR_INVALIDATION=IMMEDIATE

OPEN_CURSORS=3000

CURSOR_SPACE_FOR_TIME=FALSE

Max PGA observed is 98GB so we can not use more RAM from OS.

The database is mainly MDM (Master Data Management) but also a reporting DWH. The database ingest a lot of data from different source systems, then standardize the data and publish for data consumers. Data base is 8,2 TB size (segments) and 1,5TB are loaded to INMEMORY (using a mix of "FOR CAPACITY LOW" and "FOR QUERY HIGH") and there the occupied space, after compression is 1,05TB. The database generates about 2TB of ARCHIVED REDO LOG per day (on average).

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