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OCP 10g(1z0-042) daily 10 practices-3

1.Your database is running under automatic undo management and the UNDO_RETENTION parameter is set to 900 sec.
You executed the following command to enable retention guarantee:
ALTER TABLESPACE undotbs1 RETENTION GUARANTEE
What efeect would this statement have on the database?
A - The extents in undo tablespace retain data until the next full database backup.
B - The extents containing committed data in the undo tablespace are never overwritten.
C - The extents which no longer contain uncommitted data in the undo tablespace
are not overwritten for at least 15 minutes.
D - The extents containing committed data in the undo tablespace are not overwritten
until the instance is shut down.

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OCP 10g(1z0-042) daily 10 practices-2

1.Which three statements are true regarding the logical structure of the Oracle database?(choose three)
A - Each segment contains one or more extents
B - Mutiple tablespaces can share single datafile
C - A data block is a smallest unit of I/O for data files.
D - it is possible to have tablespaces of different blocks size in a database
E - Each data block in the database always corresponds to one OS block.
(Answer:A,C,D)

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OCP 10g(1z0-042) daily 10 practices-1

1.What are the consequences of executing the SHUTDOWN ABORT command(Choose tow)

A - The database files are synchronized.
B - Uncommitted changes are no rolled back.
C - The database is closed,but the instance is still started.
D - Database buffers and redo buffers are not written to the disk.
E - The data base undergose automatic media recovery during the next startup.

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Site of Books

I found this web site scribd  by accident.There are lots of books on this site.Here’s another similar site slideshare. Have fun!

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How to drop and recreate oracle undo tablespace and its datafile

if you get ORA-00600 or the following error message on your Oracle standby database:

Fri Mar 09 10:57:49 2007
Errors in file c:\oracle\admin92\crm\bdump\crmsb_mrp0_524.trc:
ORA-00600: internal error code, arguments: [3020], [356515961], [1], [4606], [2], [16], [], []
ORA-10567: Redo is inconsistent with data block (file# 85, block# 121)
ORA-10564: tablespace UNDOTBS2
ORA-01110: data file 85: ‘K:\ORADATA\CRM\UNDOTBS02_1.DBF’
ORA-10560: block type ‘KTU SMU HEADER BLOCK’

Or your undo tablespace has grown to unmanageable size (~ 35 Gbytes), you may want to recreate unto tablespace. Here is how:
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