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Compression causing performance issue.

edited 4:09AM in Database Tuning (MOSC) 2 commentsAnswered

Environment : Oracle 19.28 database with advanced compression enabled running on Red Hat Linux.

I have a tablespace ABC_RPT created in a block size of 16K created using BIGFILE. Inserting 1.4 million rows into a sub-partitioned table with any type of compression takes 42 seconds. Without compression it takes 3 seconds. The additional time needed for compression may top 10 seconds but not 42 seconds. In a LIVE environments we load billions of rows daily. This can cause serious performance issue.

Average Row length is 455, blocks 8900 , compression: ENABLED, compress_for : ADVANCED. The table just have date, varchar2 and number columns.

I understand there were some issues related to advanced compression (support doc id. 3073420.1). This is the first time we are using BIGFILE, can this cause performance issues. Does stack size (ulimit) play a part here?

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