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1Z0-117 - Oracle Certification Real Exam

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Pass4sure study guides are the real and prompt solution to your worries of passing IT certifications like 1z0-117 Oracle exam. Prepared with a view to provide you maximum ease in your preparation, Oracle 1z0-117 study guide is so comprehensive that you need not run after any other source material. – PowerPoint PPT presentation

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Title: 1Z0-117 - Oracle Certification Real Exam


1
1Z0-117 - Oracle Certification
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9
1Z0-117 - Oracle Real Exam
Question No 1
  • 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 queries
  • using those tables due to stale statistics.
  • Which two options might help to avoid the
    performance degradation of the queries?
  • 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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10
1Z0-117 - Oracle Real Exam
Question No 2
  • 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?
  • A. When highly selective filters is applied on an
    indexed column of a table with sparsely
  • 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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11
1Z0-117 - Oracle Real Exam
Question No 3
  • 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.
  • What does the optimizer do in this situation?
  • 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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12
1Z0-117 - Oracle Real Exam
Question No 4
  • Which two statements are true about index full
    scans?
  • 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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13
1Z0-117 - Oracle Real Exam
Question No 5
  • Examine the Exhibit.

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14
1Z0-117 - Oracle Real Exam
Question No 5
  • 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
  • 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.

AnswerC,E
15
1Z0-117 - Oracle Real Exam
Question No 6
  • You are logged in as the HR user and you execute
    the following procedure
  • SQL gt exec DBMS_STATS.SET_TABLE_PREFS (HR,
    EMPLOYEES, PUBLISH,
  • FALSE) SQLgt exec DBMS_STATS.GATHER_TABLE_STATS
    (HR, EMPLOYEES)
  • Which statement is true about the newly gathered
    statistics?
  • 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
16
1Z0-117 - Oracle Real Exam
Question No 7
  • Which two are the fastest methods for fetching a
    single row from a table based on an
  • equality predicate?
  • 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
17
1Z0-117 - Oracle Real Exam
Question No 8
  • You enable auto degree of parallelism (DOP) for
    your database instance.
  • Examine the following query
  • 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 insufficient
    parallel execution slaves are available to
    satisfy the statements DOP.
  • E. The statement will be queued if the number of
    busy parallel execution servers exceeds
    PARALLEL_SERVERS_TARGET.
  • F. The statements may execute serially.

Answer E,F
18
1Z0-117 - Oracle Real Exam
Question No 9
  • View the code sequence

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19
1Z0-117 - Oracle Real Exam
Question No 9
  • Examine the Exhibit to view the execution plan

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20
1Z0-117 - Oracle Real Exam
Question No 9
  • Which two statements are true about the query
    execution?
  • A. The optimizer joins specified tables in the
    order as they appear in the FROM clause.
  • B. The CUSTOMERS and ORDERS tables are joined
    first and the resultant is then joined
  • with rows returned by the ORDER_ITEMS table.
  • C. The CUSTOMERS and ORDER_ITEMS tables are
    joined first the resultant is then
  • joined with rows by the ORDERS table.
  • D. The optimizer has chosen hash join as an
    access method as the OPTIMIZER_MODE
  • parameter is set to FIRST_ROWS.

Answer C,D
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21
1Z0-117 - Oracle Real Exam
Question No 10
  • Examine the query and its execution plan

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22
1Z0-117 - Oracle Real Exam
Question No 10
  • Which statement is true regarding the execution
    plan?
  • A. This query first fetches rows from the
    CUSTOMERS table that satisfy the conditions, and
    then the join return NULL from the CUSTOMER_ID
    column when it does not find any corresponding
    rows in the ORDERS table.
  • B. The query fetches rows from CUSTOMERS and
    ORDERS table simultaneously, and filters the rows
    that satisfy the conditions from the resultset.
  • C. The query first fetches rows from the ORDERS
    table that satisfy the conditions, and then the
    join returns NULL form CUSTOMER_ID column when it
    does not find any corresponding rows in the
    CUSTOMERS table.
  • D. The query first joins rows from the CUSTOMERS
    and ORDERS tables and returns NULL for the ORDERS
    table columns when it does not find any
    corresponding rows in the ORDERS table, and then
    fetches the rows that satisfy the conditions from
    the result set.

Answer A
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