How to find the last update time of each table in Oracle?

I have a program that link to a database, however, when I use the program, I want to know which table does it updated? However, this program does not write any timing information nor the tables do not have a column that store the last update time. Therefore, I would like to know does Oracle records the last alteration / update time of each table? If not, are there any other methods that let me find out the last update time? Thanks!
mawinghoAsked:
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MikeOM_DBAConnect With a Mentor Commented:
Otherwise,
If you have "monitoring" option set, just check:

{ALL|DBA|USER}_TAB_MODIFICATIONS

SQL> desc ALL_TAB_MODIFICATIONS
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 TABLE_OWNER                                        VARCHAR2(30)
 TABLE_NAME                                         VARCHAR2(30)
 PARTITION_NAME                                     VARCHAR2(30)
 SUBPARTITION_NAME                                  VARCHAR2(30)
 INSERTS                                            NUMBER
 UPDATES                                            NUMBER
 DELETES                                            NUMBER
 TIMESTAMP                                          DATE
 TRUNCATED                                          VARCHAR2(3)
 DROP_SEGMENTS                                      NUMBER

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jamesguConnect With a Mentor Commented:
SELECT SCN_TO_TIMESTAMP(ORA_ROWSCN) from table_name where ...
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mawinghoAuthor Commented:
it doesn't work........
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sdstuberConnect With a Mentor Commented:
How do you define "last update time"?




the ora_rowscn suggested above shows when the commit happened,  not necessarily when the updates occured.

also note,  if the last alteration to a table was a delete, then you don't have a row for the ora_rowscn.

without logs in your application, row level auditing will give you what you want,  after that best you could do would be to go through log miner for scn estimate times.


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sdstuberConnect With a Mentor Commented:
note, turning auditing on doesn't help with historical timestamps, only as a go-forward solution.
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sdstuberConnect With a Mentor Commented:
oh and scn_to_timestamp doesn't exist in 9i.  it was introduced in 10g.
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NicksonKohConnect With a Mentor Commented:
If you use TOAD, you can easily see the last DDL date on the table.
Just go to Schema Browser and click on the Tablename. You can see the table creation and last DDL information just above the tabs.
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sdstuberConnect With a Mentor Commented:
last_ddl_time is when the table was last changed "structurally"  like truncate, create, alter table, etc.

It doesn't account for DML changes:  insert, update, delete
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dbmullenConnect With a Mentor Commented:
it appears you're trying to "reverse engineer" some process

turn on tracing
run the program
turn off tracking
http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96533/sqltrace.htm#1018

look at the dump file.
that will show everything that program does.

if tracing isn't an option, you'll have to create an after insert or update or delete trigger on every table..

forget about trying to find what happened already.  just do it again.

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