Solved

How to find unused objects?

Posted on 2013-05-30
8
1,023 Views
Last Modified: 2013-06-05
Experts -

Would it be possible to get a report of what tables are used (have read/writes operations over them) in the selected oracle schema.

We would like to remove the unused objects to make up some space.



Thanks,
sve
0
Comment
Question by:sventhan
  • 4
  • 2
  • 2
8 Comments
 
LVL 76

Accepted Solution

by:
slightwv (䄆 Netminder) earned 250 total points
ID: 39207458
I don't know of a way to track DML on tables that will be 100% accurate.

Even if you turn on auditing or run log miner through all available logs, it won't catch everything.  For example, you might have a table that is only used for year-end closing and only accessed once a year.
0
 
LVL 18

Author Comment

by:sventhan
ID: 39207620
Agree. I would say table is not being used for more than 60 days. Is there any way to find that out?
0
 
LVL 76

Expert Comment

by:slightwv (䄆 Netminder)
ID: 39207635
>> Is there any way to find that out?

Already mentioned the ways I know of:  turn on auditing and/or use log miner to go back through your old logs.
0
 
LVL 29

Assisted Solution

by:MikeOM_DBA
MikeOM_DBA earned 250 total points
ID: 39210674
You could set the tables to "MONITORING" and then query {ALL|DBA}_TAB_MODIFICATIONS view:
ALTER TABLE MyTable MONITORING;"

Open in new window

:p
0
PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

 
LVL 76

Expert Comment

by:slightwv (䄆 Netminder)
ID: 39210703
Setting monitoring might be a decent approximation but from what I read in the docs, I don't think it would be accurate here.  From the docs: "since the last time statistics were gathered".

If you have tables that are used infrequently wouldn't the *_tab_modifications view likely show no activity on a regular basis?
0
 
LVL 29

Expert Comment

by:MikeOM_DBA
ID: 39210734
You could copy the data to another table before computing statistics?
But you are right, we gather statistics daily -- bummer.
:)
0
 
LVL 76

Expert Comment

by:slightwv (䄆 Netminder)
ID: 39210751
>>You could copy the data to another table before computing statistics?

That might be a decent work-around over time.  It would almost definitely generate less data than auditing.  Likely be less of a headache than constantly worrying about purging audit logs.

Just need to make sure the capture runs before automatic statistics collection.

I've not messed with adding my own tasks to the maintenance window...
0
 
LVL 18

Author Closing Comment

by:sventhan
ID: 39224279
Thanks.
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Working with Network Access Control Lists in Oracle 11g (part 2) Part 1: http://www.e-e.com/A_8429.html Previously, I introduced the basics of network ACL's including how to create, delete and modify entries to allow and deny access.  For many…
Introduction A previously published article on Experts Exchange ("Joins in Oracle", http://www.experts-exchange.com/Database/Oracle/A_8249-Joins-in-Oracle.html) makes a statement about "Oracle proprietary" joins and mixes the join syntax with gen…
This video shows, step by step, how to configure Oracle Heterogeneous Services via the Generic Gateway Agent in order to make a connection from an Oracle session and access a remote SQL Server database table.
This video shows how to copy an entire tablespace from one database to another database using Transportable Tablespace functionality.

911 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

20 Experts available now in Live!

Get 1:1 Help Now