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Code d'Examen: 1Z0-055
Nom d'Examen: Oracle (Oracle Database 11g: New Features for 9i OCPs)
Questions et réponses: 150 Q&As
Code d'Examen: 1Z0-054
Nom d'Examen: Oracle (Oracle Database 11g: Performance Tuning)
Questions et réponses: 192 Q&As
Code d'Examen: 1Z0-531
Nom d'Examen: Oracle (Oracle Essbase 11 Essentials)
Questions et réponses: 69 Q&As
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NO.1 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
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NO.2 Identify two correct statements about the Active Session History (ASH) data. (Choose two.)
A.A part of SGA memory is used to store ASH data as rolling buffer.
B.The ASH data can be analyzed between any two small time intervals.
C.All ASH data in memory are flushed to disk by MMON in every 3 seconds.
D.All ASH data in memory are flushed to disk by MMNL process whenever the buffer is full.
ANSWER: AB
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NO.3 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
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NO.4 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
optimizer_mode string ALL_ROWS
db_file_multiblock_read_count integer 64
The index created on the column used in the WHERE clause of the query. You notice that the query is not
using the index. Instead of an index scan, a full table scan is used.
View the Exhibit and examine the autotrace output for a query.
What could be the reason for it? (Choose all that apply.)
A. The OPTIMIZER_INDEX_COST_ADJ initialization parameter has a low value.
B. The DB_FILE_MULTIBLOCK_READ_COUNT initialization parameter has a low value.
C. The statistics for the table and all the indexes associated with the table are not current.
D. The table has less than DB_FILE_MULTIBLOCK_READ_COUNT blocks under the high-water mark.
ANSWER: CD
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NO.5 View Exhibit1 and examine the indexes on the CUSTOMERS table.
The statistics for the CUSTOMERS table have been updated recently by using the following command:
SQL> EXEC DBMS_STATS.GATHER_TABLE_STATS('SH','CUSTOMERS',method_opt=>'FOR ALL
INDEXED COLUMNS SIZE AUTO');
View Exhibit2 to examine a query plan. Even though the index is present on the COUNTRY_ID and
CUST_GENDER columns, the query uses a full table scan. What could be the reason?
A. because the histogram statistics for the COUNTRY_ID column are not updated
B. because the DB_FILE_MULTIBLOCK_READ_COUNT initialization parameter is set to a high value
C. because the optimizer calculates the cost of accessing blocks by using a full table scan to be less as
compared to index scans, even though indexes are available
D. because indexes on CUST_GENDER and COUNTRY_ID columns are of different types, the index on
the CUST_GENDER column is bitmap index, and on COUNTRY_ID columns is btree index.
ANSWER: C
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NO.6 After running SQL Performance Analyzer (SPA), you observe a few regressed SQL statements in the
SPA output. Identify the two actions that you would suggest for these regressed SQL statements.
(Choose two.)
A.Running SQL Access Advisor
B.Adding them to SQL Plan Baseline
C.Submitting them to SQL Tuning Advisor
D.Running Automatic Database Diagnostic Monitor (ADDM)
ANSWER: BC
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NO.7 You observed that some of the queries are performing poorly on the SALES_RECORDS table in your
database.
On further investigation, you find that at the end of each day the contents of the SALES_RECORDS table
are transferred to the SALES table and deleted from the SALES_RECORDS table. The deleted
operations cause the table to be sparsely populated.
You decided to use the ALTER TABLE...SHRINK SPACE COMPACT command to shrink the table.
Why would you choose this method? (Choose all that apply.)
A. because it can be used during peak hours
B. because it avoids unnecessary cursor invalidation
C. because it adjusts the high-water mark (HWM) immediately
D. because you have long-running queries that might span the shrink operation
E. because it does not allow any data manipulation language (DML) operations, thereby making the
shrink
operation faster
ANSWER: ABD
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NO.8 View the Exhibit exhibit1 to examine the series of SQL commands and parameter settings.
View the Exhibit exhibit2 to examine the plans available in the SQL plan baseline.
The first plan (in red) is created when OPTIMIZER_MODE is set to ALL_ROWS and the second plan (in
blue) is created when OPTIMIZER_MODE is set to FIRST_ROWS.
Which SQL plan baseline would be used if the SQL query in exhibit1 is executed again when the value of
OPTIMIZER_MODE is set to FIRST_ROWS?
A. the second plan, because it is a fixed plan
B. the first plan, because it is an accepted plan
C. the second plan, because it is the latest generated plan in FIRST_ROW mode
D. A new plan, because the second plan in FIRST_ROW mode is not an accepted plan
ANSWER: B
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