LOB segment size is significantly increasing despite of small actual size of data in it

(Doc ID 2326423.1)

Last updated on NOVEMBER 08, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 12.1.0.2 to 12.2.0.1 [Release 12.1 to 12.2]
Information in this document applies to any platform.

Symptoms

+ A LOB segment is of size around few hundreds of GB when it is actually of around few hundred of MB only.

+ Also, 'enq: TX - contention' wait event is noticed in peak hours on the same LOB.

Cause

Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms