Performance on the backups RMAN and LOBs
Hi allWe have 4 data nodes (11.2.0.3) running on a RHEL. The db has 2.5TBs, and we realized that the backup incremental level 1 takes too long to complete. Doing some research, we found a few posts saying that, during a backup of a segment, if this same segment has a large number of business segments (and that's our case... a large number of business segments) and backup compression (we use COMPRESSION to CONFIGURE ALGORITHM 'HIGH' OPTIMIZE for LOAD REAL EN BROADCAST 'DEFAULT') this backup even can take much longer than an uncompressed backup. What I would like to know, is if you have had an equal experience and if you change the algorithm of compression to zero, the backup will run faster.
PS - the entry and exit of the backup is disk.
Thanks in advance.
Hello;
Yes is the simple answer.
SELECT
ALGORITHM_NAME,
ALGORITHM_DESCRIPTION,
IS_DEFAULT
FROM
V$RMAN_COMPRESSION_ALGORITHM;
Compression can take a long time depending on the stored data. Try to compress a file zip for example, it is generally slower on the second pass.
Best regards
mseberg
Tags: Database
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