1Z0-117 - Oracle Certification Prep

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    1Z0-117 - Oracle Certification

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    About Oracle 1Z0-117 Exam

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    Oracle Certification Prep: 1Z0-117

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    1z0-117 Exam Basics

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    1Z0-117 - Oracle Real Exam

    You are administering a database that supports an OLTP workload. Automatic optimizer statistics collection is scheduled in the night maintenance window. Some of the tables get

    updated frequently during day time and you notice a performance degradation for queriesusing those tables due to stale statistics.

    Question No : 1

    c wo op ons m g e p o avo e per ormance egra a on o e quer es

    A. Set the global statistics preference STALE_PERCENT to 0. B. Use dynamically sampling hint for the queries on frequently updated tables. C. Create histogram for the columns used frequently in the WHERE clause.

    D. Gather statistics with global statistics preference NO_VALIDATE to TRUE. E. Set the OPTIMZER_USE_PENDING_STATISTICS parameter to TRUE.

    Answer: B,C

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    1Z0-117 - Oracle Real Exam

    You are administering database that supports an OLTP workloads. Most of the queries use an index range scan or index unique scan as access methods.

    Which three scenarios can prevent the index access being used by the queries?

    Question No : 2

    . en g y se ec ve ers s app e on an n exe co umn o a a e w sparse y populated blocks. B. When the rows are filtered with an IS NULL operator on the column with a unique key defined C. When the histogram statistics are not collected for the columns used in where clause. D. When a highly selective filter is applied on the indexed column and the index has very

    low value for clustering factor. E. When the statistics for the table are not current.

    Answer: A,B,E

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    1Z0-117 - Oracle Real Exam

    While tuning a SQL statement, the SQL Tuning Advisor finds an existing SQL profile for a statement that has stale statistics. Automatic optimizer statistics is

    enabled for the database.

    Question No : 3

    A. Updates the existing SQL profiles for which the statistics are stale. B. Makes the statistics information available to GATHER_DATABASE_STATS_JOB_PROC

    C. Starts the statistics collection process by running GATHER_STATS_JOB D. Writes a warning message in the alert log file

    Answer: B

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    1Z0-117 - Oracle Real Exam

    Which two statements are true about index full scans?

    Question No : 4

    A . An index fast full scan multi block I/O to read the index structure in its entirely. B . Index nodes are not retrieved in the index order, and there fore the nodes are not in sequence. C. An index fast full scan reads the index block by block.

    D . An index fast full scan reads the whole index from the lowest value to the higher value.

    Answer: A,B

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    1Z0-117 - Oracle Real Exam

    Examine the Exhibit.

    Which two statements are true about the bloom filter in the execution plan? A. The bloom filter prevents all rows from table T1 that do not join T2 from being needlessly

    distributed. B. The bloom filter prevents all rows from table T2 that do not join table T1 from being

    Question No : 5

    needlessly distributed. C. The bloom filter prevents some rows from table T2 that do not join table T1 from being needlessly distributed. D. The bloom filter is created in parallel by the set of parallel execution processes that scanned table T2.

    E. The bloom filter is created in parallel by the set of parallel execution processes that later perform join. F. The bloom filter is created in parallel by the set of parallel execution processes that scanned table T1.

    Answer:C,E

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    1Z0-117 - Oracle Real Exam

    You are logged in as the HR user and you execute the following procedure: SQL > exec DBMS_STATS.SET_TABLE_PREFS (‘HR’, ‘EMPLOYEES’, ‘PUBLISH’,

    ‘FALSE’); SQL> exec DBMS_STATS.GATHER_TABLE_STATS (‘HR’, ‘EMPLOYEES’); Which statement is true about the newly gathered statistics?

    Question No : 6

    A. They are temporary and purged when the session exits. B. They are used by the optimizer for all sessions.

    C. They are locked and cannot be overwritten. D. They are marked as pending and stored in the pending statistics table.

    Answer :D

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    1Z0-117 - Oracle Real Exam

    Which two are the fastest methods for fetching a single row from a table based on an equality predicate?

    Question No : 7

    A. Fast full index scan on an index created for a column with unique key B. Index unique scan on an created for a column with unique key C. Row fetch from a single table hash cluster D. Index range scan on an index created from a column with primary key E. Row fetch from a table using rowid

    Answer :C,E

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    1Z0-117 - Oracle Real Exam

    You enable auto degree of parallelism (DOP) for your database instance. Examine the following query:

    Question No : 8

    Which two are true about the execution of statement? A. Dictionary DOP for the objects accessed by the query is used to determine the statement DOP. B. Auto DOP is used to determine the statement DOP only if the estimated serial execution time exceeds PARALLEL_MIN_TIME_THRESHOLD. C. Dictionary DOP is used to determine the statement DOP only if the estimated serial execution time exceeds

    ARALLEL_MIN_TIME_THRESHOLD. D. The statement will be queued if insu