データ量の増加を背景に、ますます重要性が高まるパフォーマンス管理スキル。その付加価値の高いスキルを証明する資格が遂に登場。オラクル認定の中で1Z0-054、1Z0-055
、1Z0-035のような科目もすごく人気があって 、受ける人がたくさんいます、KILLTESTは皆さんのために1Z0-054、1Z0-055、1Z0-035
などいろいろなOracle 認定問題集をリリースして、皆さんがもっと便利で試験を通すように助けます。
これから1Z0-054無料 問題集を出して、皆さんの勉強に役に立てばいい。
12. You are working on an online transaction processing (OLTP) system. By day most of the application
users perform queries accessing the most recently added or modified rows. The applications have most
of the queries based on multiple tables. But at night, some batch processing is also done.
Which two actions would you recommend to choose a goal for the optimizer based on the needs of your
application? (Choose two.)
A.setting the OPTIMIZER_MODE parameter to ALL_ROWS at the instance level
B.setting the OPTIMIZER_MODE parameter to FIRST_ROWS_n at the instance level
C.asking the developer to add a hint /*ALL_ROWS*/ in the long-running batch processing queries
D.asking the developer to add a hint /*FIRST_ROWS_n*/ in the long-running batch processing queries
ANSWER: BC
13. Which three factors influence the optimizer's behavior while choosing an optimization approach and
goal for a SQL statement? (Choose three.)
A.parsing of a SQL statement
B.operating system (OS) statistics
C.object statistics in the data dictionary
D.the OPTIMIZER_MODE initialization parameter
E.optimizer SQL hints for changing the query optimizer goal
ANSWER: CDE
15. Examine the initialization parameter values for the instance given below:
NAME TYPE VALUE
optimizer_capture_sql_plan_baselines boolean FALSE
optimizer_dynamic_sampling integer 2
optimizer_features_enable string 11.1.0.6
optimizer_index_caching integer 0
optimizer_index_cost_adj integer 100
The safer , easier way to help you pass any IT exams.
optimizer_mode string ALL_ROWS
db_file_multiblock_read_count integer 64
You notice that the one of the queries is using a full table scan (view Exhibit1) instead of index unique
scan (view Exhibit2). The index is present on the column that is accessed in the WHERE clause of the
query. The cost for a full table scan is more than that for an index unique scan.
Why would the optimizer choose full table scan over index unique scan? (Choose all that apply.)
A. The OPTIMIZER_INDEX_COST_ADJ initialization parameter is set to a low value.
B. The OPTIMIZER_INDEX_COST_ADJ initialization parameter is set to a high value.
C. The DB_FILE_MULTIBLOCK_READ_COUNT initialization parameter is set to a low value.
D. The statistics for the table and all the indexes associated with the table are not current.
ANSWER: BD
16. The columns CUST_CITY, CUST_STATE_PROVINCE, and COUNTRY_ID are frequently used
together in the WHERE clause of the queries. The CUSTOMERS table is a big table with 20 GB of data.
You notice that the selectivity for these three columns varies from the selectivity that the optimizer
calculates.
What would you recommend to influence the selectivity calculated by the optimizer?
A. creating function-based indexes by concatenating all the columns
B. updating histogram statistics for these columns by using the DBMS_STATS.GATHER_TABLE_STATS
procedure
C. using the DBMS_STATS.CREATE_EXTENDED_STATS function to create a virtual column and create
index on the virtual column
D. using the DBMS_STATS.CREATE_EXTENDED_STATS function to create a virtual column and the
DBMS_STATS.GATHER_TABLE_STATS procedure to collect statistics on the virtual column
ANSWER: D
これから1Z0-054無料 問題集を出して、皆さんの勉強に役に立てばいい。
12. You are working on an online transaction processing (OLTP) system. By day most of the application
users perform queries accessing the most recently added or modified rows. The applications have most
of the queries based on multiple tables. But at night, some batch processing is also done.
Which two actions would you recommend to choose a goal for the optimizer based on the needs of your
application? (Choose two.)
A.setting the OPTIMIZER_MODE parameter to ALL_ROWS at the instance level
B.setting the OPTIMIZER_MODE parameter to FIRST_ROWS_n at the instance level
C.asking the developer to add a hint /*ALL_ROWS*/ in the long-running batch processing queries
D.asking the developer to add a hint /*FIRST_ROWS_n*/ in the long-running batch processing queries
ANSWER: BC
13. Which three factors influence the optimizer's behavior while choosing an optimization approach and
goal for a SQL statement? (Choose three.)
A.parsing of a SQL statement
B.operating system (OS) statistics
C.object statistics in the data dictionary
D.the OPTIMIZER_MODE initialization parameter
E.optimizer SQL hints for changing the query optimizer goal
ANSWER: CDE
15. Examine the initialization parameter values for the instance given below:
NAME TYPE VALUE
optimizer_capture_sql_plan_baselines boolean FALSE
optimizer_dynamic_sampling integer 2
optimizer_features_enable string 11.1.0.6
optimizer_index_caching integer 0
optimizer_index_cost_adj integer 100
The safer , easier way to help you pass any IT exams.
optimizer_mode string ALL_ROWS
db_file_multiblock_read_count integer 64
You notice that the one of the queries is using a full table scan (view Exhibit1) instead of index unique
scan (view Exhibit2). The index is present on the column that is accessed in the WHERE clause of the
query. The cost for a full table scan is more than that for an index unique scan.
Why would the optimizer choose full table scan over index unique scan? (Choose all that apply.)
A. The OPTIMIZER_INDEX_COST_ADJ initialization parameter is set to a low value.
B. The OPTIMIZER_INDEX_COST_ADJ initialization parameter is set to a high value.
C. The DB_FILE_MULTIBLOCK_READ_COUNT initialization parameter is set to a low value.
D. The statistics for the table and all the indexes associated with the table are not current.
ANSWER: BD
16. The columns CUST_CITY, CUST_STATE_PROVINCE, and COUNTRY_ID are frequently used
together in the WHERE clause of the queries. The CUSTOMERS table is a big table with 20 GB of data.
You notice that the selectivity for these three columns varies from the selectivity that the optimizer
calculates.
What would you recommend to influence the selectivity calculated by the optimizer?
A. creating function-based indexes by concatenating all the columns
B. updating histogram statistics for these columns by using the DBMS_STATS.GATHER_TABLE_STATS
procedure
C. using the DBMS_STATS.CREATE_EXTENDED_STATS function to create a virtual column and create
index on the virtual column
D. using the DBMS_STATS.CREATE_EXTENDED_STATS function to create a virtual column and the
DBMS_STATS.GATHER_TABLE_STATS procedure to collect statistics on the virtual column
ANSWER: D