The optimizer automatically changes a plan during subsequent execution of a SQL statement if there is a huge difference in optimizer estimates and execution statistics.
The optimizer can re optimize a query only once using cardinality feedback.
The optimizer enables monitoring for cardinality feedback after the first execution of a query.
The optimizer does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled.
After the optimizer identifies a query as a re-optimization candidate, statistics collected by the collectors are submitted to the optimizer.
第1题：
A.120M
B.320M
C.480M
D.600M
第2题：
Examine the following parameters for a database instance: MEMORY_MAX_TARGET=0MEMORY_TARGET=0SGA_TARGET=0PGA_AGGREGATE_TARGET=500mWhich three initialization parameters are not controlled by Automatic Shared Memory Management (ASMM)?（）
A. LOG_BUFFER
B. SORT_AREA_SIZE
C. JAVA_POOL_SIZE
D. STREAMS_POOL_SIZE
E. DB_16K_CACHE_SZIE
F. DB_KEEP_CACHE_SIZE
第3题：
A. The MEMORY_MAX_TARGET parameter is automatically set to 500 MB
B. The value of the MEMORY_MAX_TARGET parameter remains zero till it is changed manually
C. The PGA_AGGREGATE_TARGET and SGA_TARGET parameters are automatically set to zero
D. The lower bounds of PGA_AGGREGATE_TARGET and SGA_TARGET parameters are set to 90 MB and 270 MB, respectively
第4题：
In your production database you want to use an Automatic Storage Management （ASM） instance to manage the database files. Which option would you use to migrate the database files from a non-ASM instance to an ASM instance？（）
第5题：
You specify a nonzero value for the MEMORY_TARGET initialization parameter，but do not set the PGA_AGGREGATE_TARGET or the SGA_TARGET parameters. You restart your database instance. Which statement about the result is true？（）
第6题：
A. 90 MB
B. 272 MB
C. 362 MB
D. 1,440 MB
第7题：
You work as a database administrator for Supportcenter.cn. The database is open. A media failure has occurred， resulting in loss of all the control files in your database. Which statement regarding the database instance is true in this scenario？（）
第8题：
View the Exhibit to examine the parameters set for your database instance.You execute the following command to perform I/O calibration after the declaration of bind variables in the session that are used in the command:Which statement describes the consequence?（）
A. The command produces an error.
B. The calibration process runs successfully and populates all the bind variables.
C. The calibration process runs successfully but the latency time is not computed.
D. The calibration process runs successfully but only the latency time is computed.Only users with the SYSDBA privilege can run this procedure. Qualified users must also turn on timed_statistics, and ensure asynch_io is enabled for datafiles.
第9题：
For which database operation would you need the database to be in the MOUNT state（）
第10题：
Examine the values for the following initialization parameters： FAST_START_MTTR_TARGET = 0LOG_CHECKPOINT_INTERVAL = 0 Which two will be the implications of these values in your database（）