Topic: Database Administration >> Abount the Sql Query
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| Title: Abount the Sql Query |
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Posted: Feb 13, 2008 07:59:26 AM |
Total Post: 27
Joined: Feb, 2008
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Q1.:- After dropping the table view does not dropped. then how we can see the result of view.
Q2. What is the difference between Dynamic performance table and Dynamic performance view.
Q3. How can i see the values or parameter at the time of table creation.
Q4. How can we give the unused column
Example Alter table emp_4 set unused column parameter. |
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 MOH_DBA |
| Posted: Feb 13, 2008 05:11:10 PM |  |
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Total Post: 155
Joined: Nov, 2007
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Q1.:- Do you mean by the result, the status or the data? the data you cannot see, the status you can query the all_objects table as follow
select * from all_objects where status = 'INVALID'.
Q2. V$View
- These are base on x$ tables -memory structures which hold instance information and are therefore aviable when instance is in a nomount or mount state.
- They are listed in v$fixed_table.
-the v$ view (actually synonyms for v_$ views) belong tp sys user.
X$ Tables
- These are not usually quered directly; not all the information is necessarily useful, and column names tend to be abbreviated and obscure.
- the x$ tables are dynamic, and their contents are constantly changing.
- the v$ views, and the underlying X$ tables, are populated at instance startup and cleared out at shutdown.
- they hold timig information if you set the timed_statistics init.ora parameter to true or if you execute the following sql command:
alter system set timed_statistics = true;
Q3. Do you mean database parameter of table creation opetions, table creation option can be found on dba_tables.
The database parameters, you see when did the database parameters changed and compare them with table creation time.
Q4. What do you mean give unused column? the unused process like the drop column process cannot be rollbacked, unless some incomplete recovery.
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