I dealt with this situation recently. I even tried reorganizing LOBs but no
avail. In the end I’d to sought help from oracle support who dived in and
suggested few internal memory parameters to be set and then reorganize LOBs
once again. It has helped somewhat but to what extent is still too early to
call.
alter system set "_enable_space_preallocation= 3;
alter system set "_ktslj_segext_warning" = 0;
alter system set "_securefiles_concurrency_estimate"=50 scope=spfile;
HTH.
Thanks.
-Saad
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Sanjay Mishra
Sent: Monday, February 24, 2020 5:19 PM
To: Oracle-L Freelists <oracle-l@xxxxxxxxxxxxx>
Subject: [EXTERNAL] Oracle Securefile Lobs
External Email. Use Caution.
I had one application that stores lots of transactional data in LOB and the
same is updated heavily. Does frequent update on LOB
1. Impact system performance heavily
2. Can cause lots of Fragmentation
3. Need any frequent maintenance as part of optimization
The database is 18c and LOBS are secure files and Partitioned.
TIA
Sanjay
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