My Oracle Support Banner

"Unsupported" Entries in V$LOGMNR_CONTENTS For SQL_REDO and SQL_UNDO When Mined Objects Contain JSON Column (Doc ID 2945532.1)

Last updated on APRIL 28, 2023

Applies to:

Oracle Database - Enterprise Edition - Version 19.3.0.0.0 and later
Information in this document applies to any platform.

Symptoms

When using ad-hoc LogMiner (i.e. the DBMS_LOGMNR API) to mine redo for tables with columns that have JSON attributes in an extended varchar2 environment (MAX_STRING_SIZE=EXTENDED), the SQL_REDO and SQL_UNDO columns show 'Unsupported'.

A simple test case that illustrates the issue is:

If max_string_size=STANDARD, this issue does not occur.

Cause

To view full details, sign in with your My Oracle Support account.

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

In this Document
Symptoms
Cause
Solution
References


My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.