impact of production if I reduce space on the table...
Hello experts.I am running Oracle 11.2 and seen in OEM I have a table that is candidate to shrink the space.
According to OEM, I can gain 5 G by the decrease in the table.
The table is 16G, so if I reduce the table, then it should reduce about 11 g, right?
This table is the primary table used by our application, impact on production is very important.
Good, then I wonder what is the impact of production on the table while I shrink space on the table.
I'll test now in my test environment.
First of all, I found that I had a function based index to be deleted until I can reduce the table.
So I ran dbms_metadata for syntax to recreate the FBI, then dropped the FBI.
Then I ran change movement line of table owner.tablename enable;
Then I ran alter table shrink space cascade owner.tablename;
While I'm under the table command shrink, I opened another session and I asked the table and even made some updates on the table.
I was very surprised that the table is not locked and is always accessible for update and select statements.
In fact, I don't see any noticeable impact of the retractable table command.
Obviously, I'm not in the production environment with hundreds of simultaneous users, but my question is what kind of impact should I expect see if I have it in production with people hitting this table? (No, this isn't an IOT.)
Any ideas?
Published by: 974632 on February 19, 2013 05:54
NOTE: The command table shrink took: passed: 00:43:17.19
Re-create the function based index took: passed: 00:00:28.80
No, the shrinkage is invalid index.
This means that when you use the CASCADE option, index will be narrowed as much too. When you use shrink, you use the clause 'movement of table XXXX line activate edit' which can cause invalid objects such as triggers or procedures related to the XXXX table.
Also, if you issue the following statement "alter table enable/disable row movement;"
it will invalidate any stored procedure that references that table. But, once you reference that
invalid stored procedure, Oracle recompiles it
from: http://asktom.oracle.com/pls/asktom/f?p=100:11:0:P11_QUESTION_ID:35203106066718
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