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Oracle table last modified tips

Oracle Tips by Burleson Consulting

July 8, 2013

Question:  I know about the last_ddl_time column  in dba_objects, but I am hoping to find some metadata dictionary column to give me the mask DML time for an Oracle table.  In sum, I want to find the last time that a table was updated, using a dictionary SQL script.

Answer: There is no equivalent column in dba_tables because of the high overhead in keeping such a column current.  Tables can have hundreds of modifications per minute and making a last_dml_time column is prohibitively expensive because it would introduce a bottleneck in the Oracle dictionary. 

Instead you can use the Oracle LogMiner utility to find the last date-time when a table was modified.  This uses the dba_tab_modifications view.

Also see these related notes on using flashback_time with export.
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