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Oracle table last modified tips

Oracle Database Tips by Donald BurlesonJuly 8, 2015

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.

Tracking table changes with dbms_logmnr

You can see DML against a table by mining the redo logs, both online and offline, to find SQL or DDL statements. This can be accomplished using the dbms_logmnr package. But first one needs to install the package as follows:


SQL> connect sys/mgr as sysdba

SQL> @?\/rdbms/admin/dbmslm.sql


Package created.


Grant succeeded.


Synonym created.


Now, for this example, assume that the data root problem or cause occurred fairly recently, as though the phone just rang with a frantic request for help, and expect to find the culprit transaction or transactions still within the online redo logs. So query the data dictionary to find the names of those files.











Since it is fine for now to work from just those online redo log files, inform the Oracle log miner utility by registering those redo log files as the ones of interest for mining as shown here:







Log miner will require access to a data dictionary lookup reference location so that it can map object IDs to object names. The easiest and recommended source for that information is the current online data dictionary for that database. The other two options involve extracting that lookup information either into the log files or a flat file. Here is the code for using the online data dictionary.


execute DBMS_LOGMNR.START_LOGMNR (options => dbms_logmnr.dict_from_online_catalog);


PL/SQL procedure successfully completed.


Starting a log miner session like this results in the population of a view named v$logmnr_contents. Note how the query and results look pretty much the same as the new Oracle 11g flashback transaction.


SQL> select xid, start_scn, operation, table_name, undo_sql from v$logmnr_contents where start_timestamp>=sysdate-1 and username='BERT' and table_owner='BERT';


---------------- ---------- ------------ ------------



0200030052030000     475697 DELETE       JUNK

insert into "BERT"."JUNK"("C1","C2") values ('5','6');


0200030052030000     475697 DELETE       JUNK

insert into "BERT"."JUNK"("C1","C2") values ('3','4');


0200030052030000     475697 INSERT       JUNK

delete from "BERT"."JUNK" where ROWID = 'AAAD94AAAAAAChOAAD';


0200030052030000     475697 INSERT       JUNK

delete from "BERT"."JUNK" where ROWID = 'AAAD94AAAAAAChOAAC';


0200030052030000     475697 INSERT       JUNK

delete from "BERT"."JUNK" where ROWID = 'AAAD94AAAAAAChOAAB';


0200030052030000     475697 INSERT       JUNK

delete from "BERT"."JUNK" where ROWID = 'AAAD94AAAAAAChOAAA';


All that is left is to end the log miner session and it is done.




PL/SQL procedure successfully completed.

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