Solved

query

Posted on 2012-12-31
5
221 Views
Last Modified: 2013-01-16
SQL> create tablespace my_tb datafile '/u01/oracle/oradata/repdb/my_tbs.dbf' size 100m; Tablespace created.


 SQL> create table my_tab tablespace my_tbs as select * from dba_objects;

why we are using the part " select * from dba_objects" in the query.....


??
0
Comment
Question by:walkerdba
5 Comments
 
LVL 9

Expert Comment

by:armchair_scouse
ID: 38733833
Presumably to adopt the structure/columns of dba_objects as the basis of the structure of your table my_tbs, and possibly to import any records from dba_objects if there are any present in the table.

Happy New Year!!
0
 
LVL 23

Expert Comment

by:David
ID: 38733872
The sys.dba_objects view shows the data dictionary (every database object).  It is a commonly cited set of "random" data.  As your example shows, it's a quick way to populate a test table.  The other advantage is that it gives you a consistent test bed if you need to drop and repopulate the table.
0
 
LVL 37

Accepted Solution

by:
Geert Gruwez earned 500 total points
ID: 38735647
you have 2 different names of tablespace in the 2 commands.

tablespace created: MY_TB
table destination tablespace: MY_TBS

was the intention not the same tablespace  ?
or just a typo ... :)
0
 
LVL 35

Expert Comment

by:Mark Geerlings
ID: 38736518
Or, are you asking: "Why create a table that is a copy of data that is already available from a view?"  One reason for doing this is for performance.  If you need to retrieve this data multiple times, repeated queries of this table will likely be much faster (and cause many fewer logical block reads) than a query from the view.
0
 

Author Closing Comment

by:walkerdba
ID: 38784013
solved
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

How to Unravel a Tricky Query Introduction If you browse through the Oracle zones or any of the other database-related zones you'll come across some complicated solutions and sometimes you'll just have to wonder how anyone came up with them.  …
Using SQL Scripts we can save all the SQL queries as files that we use very frequently on our database later point of time. This is one of the feature present under SQL Workshop in Oracle Application Express.
Via a live example, show how to take different types of Oracle backups using RMAN.
This video shows how to configure and send email from and Oracle database using both UTL_SMTP and UTL_MAIL, as well as comparing UTL_SMTP to a manual SMTP conversation with a mail server.

948 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

24 Experts available now in Live!

Get 1:1 Help Now