Getting a list of "Active" tables in a schema

DB Version:11G
Our schema for a particular application has around 500 tables. But only 200 tables are actually used by our application. I want to generate an ER diagram of only these active tables. How can i find the tables which had a DML in the last 5 months?

I believe the row scn option is only available if the table is configured to store the value and this is generally not available on systems where the tables were upgraded: (PS 10.2.0.3 used for testing queries)
select max(scn_to_timestamp(ora_rowscn)) from mcp_tool_asm
ERROR at line 1:
ORA-08181: specified number is not a valid system change number
ORA-06512: at "SYS.SCN_TO_TIMESTAMP", line 1I think just querying v$segment_statistics which does not require reading the actual table to see the number of IO statistics done against the object might be better.
select owner, object_name, value
from v$segment_statistics
where statistic_name = 'physical reads'
order by owner, object_nameAuditing as mentioned is probably the best long term approach since v$segment_statistics is only from instance startup.
HTH -- Mark D Powell --
Edited by: Mark D Powell on Dec 10, 2009 7:51 AM Added PS in second line

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Hi,
999355 wrote:
Hello Experts, (I appologize if i am not using the right way to ask questions)See the froum FAQ {message:id=9360002}
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The query that i am using is as follows;
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L_PROD_LINE.PROD_LINE,
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L_P_L.PROD_LINE;I take it that the tables in question are ENROLLMENT, PRDCT and L_P_L; they won't have different names in different schemas.
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Sorry, I'm running out of time now. I hope this helps.

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