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Exam : Oracle 1Z0-236
Title : 11i applications DBA:fundamentals II


1. Users complain of slow response time in your online transaction processing (OLTP) system. You compare current statistics with baseline statistics. You notice that in the current statistics library cache, the hit ratio has decreased and there are request misses for shared pool reserved area. Given below are the sizes of shared pool and shared pool reserved area:
SHARED_POOL_SIZE = 500 MB
SHARED_POOL_RESERVED_SIZE = 50 MB
What kind of strategy would you suggest for performance tuning?
A. increase the size of only the shared pool
B. decrease the size of the shared pool reserved area
C. increase the size of only the shared pool reserved area
D. increase the sizes of both the shared pool and the shared pool reserved area
E. increase the size of the shared pool and decrease the size of the shared pool reserved area
Answer: D

2. You are working in an OLTP environment. You wish to reduce the virtual memory requirements for the Oracle instance due to Operating system paging or swap overheads. You need to determine whether the buffer cache is oversized and could tolerate being reduced. In which two cases can you afford to reduce the buffer cache size? (Choose two.)
A. if the cache hit ratio is very high
B. if there are no waits for free buffers
C. if the rate of physical I/O is very high
D. if the number of full table scans is very low
E. if the number of index accesses is very high
Answer: AB

3. You plan to perform a backup of the control file in your database. Which two statements regarding the control file backup are true? (Choose two.)
A. You can back up the control file to a binary file.
B. You must bring the database to the NOMOUNT state to perform the control file backup.
C. You must store all types of control file backups in the location defined by USER_DUMP_DEST.
D. You can back up the control file by generating a script that can be used to re-create the control file.
Answer: AD

4. Which type of lock is held by SQL statements and PL/SQL objects in the Library Cache?
A. breakable parse locks
B. row-level (TX type) lock
C. table-level manual locks
D. table-level (TM type) locks
Answer: A

5. In an online transaction processing (OLTP) system, which is configured in shared server mode, you execute the following query to examine the sort performance:
SQL> SELECT d.value "Disk", m.value "Mem", (d.value/m.value)*100 "Ratio"
FROM v$sysstat m, v$sysstat d
WHERE m.name='sorts (memory)' and d.name='sorts (disk)';
Disk Mem Ratio
---------- ---------- -------------
23 206 11.165049
What action would you take after observing the output?
A. increase the value of SORT_AREA_SIZE
B. increase the size of the temporary tablespace
C. increase the value of PGA_AGGREGATE_TARGET
D. no action required because the ratio is perfect for an OLTP system
Answer: A

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