You notice a performance change in your production Oracle 12c database. You want to know which change caused this performance difference.Which method or feature should you use、

试卷相关题目

• 1Which three features work together, to allow a SQL statement to have different cursors for the same statement based on different selectivity ranges、

  A.Bind Variable Peeking

  B.SQL Plan Baselines

  C.Adaptive Cursor Sharing

  D.Bind variable used in a SQL statement

  E.Literals in a SQL statement

  开始考试点击查看答案
• 2You notice a high number of waits for the db file scattered read and db file sequential read events in the recent Automatic Database Diagnostic Monitor (ADDM) report. After further   investigation, you find that queries are performing too many full table scans and indexes    are not being used even though the filter columns are indexed.Identify three possible reasons for this.

  A.Missing or stale histogram statistics

  B.Undersized shared pool

  C.High clustering factor for the indexes

  D.High value for the DB_FILE_MULTIBLOCK_READ_COUNT parameter

  E.Oversized buffer cache

  开始考试点击查看答案
• 3Which two statement is true concerning dropping a pluggable database (PDB)、

  A.The PDB must be open in read-only mode.

  B.The PDB must be in mount state.

  C.The PDB must be unplugge

  D.D.The PDB data files are always removed from disk.

  E.A dropped PDB can never be plugged back into a multitenant container database (CDB).

  开始考试点击查看答案
• 4You upgrade your Oracle database in a multiprocessor environment. As a recommended you execute the following script:SQL > @utlrp.sqlWhich two actions does the script perform、

  A.Parallel compilation of only the stored PL/SQL code

  B.Sequential recompilation of only the stored PL/SQL code

  C.Parallel recompilation of any stored PL/SQL code

  D.Sequential recompilation of any stored PL/SQL code

  E.Parallel recompilation of Java code

  F.Sequential recompilation of Java code

  开始考试点击查看答案
• 5Identify two correct statements about multitenant architectures.

  A.Multitenant architecture can be deployed only in a Real Application Clusters (RAC) configuration.

  B.Multiple pluggable databases (PDBs) share certain multitenant container database (CDB) resources.

  C.Multiple CDBs share certain PDB resources.

  D.Multiple non-RAC CDB instances can mount the same PDB as long as they are on the same server.

  E.Patches are always applied at the CDB level.

  F.A PDB can have a private undo tablespace.

  开始考试点击查看答案
• 6You want to capture column group usage and gather extended statistics for better cardinality estimates for the CUSTOMERS table in the SH schem

  A.Examine the following steps:1.Issue the SELECT DBMS_STATS.CREATE_EXTENDED_STATS (‘SH’, ‘CUSTOMERS’) FROM dual statement.2.Execute the DBMS_STATS.SEED_COL_USAGE (null, ‘SH’, 500)procedure.3. Execute the required queries on the CUSTOMERS table.4. Issue the SELECT DBMS_STATS.REPORT_COL_USAGE (‘SH’, ‘CUSTOMERS’) FROM dual statement.Identify the correct sequence of steps.A.3, 2, 1, 4

  B.2, 3, 4, 1

  C.4, 1, 3, 2

  D.3, 2, 4, 1

  开始考试点击查看答案
• 7Which three statements are true about Automatic Workload Repository (AWR)、

  A.All AWR tables belong to the SYSTEM schema.

  B.The AWR data is stored in memory and in the database.

  C.The snapshots collected by AWR are used by the self-tuning components in the database

  D.AWR computes time model statistics based on time usage for activities, which are displayed in the v$SYS time model and V$SESS_TIME_MODEL views.

  E.AWR contains system wide tracing and logging information.

  开始考试点击查看答案
• 8An application accesses a small lookup table frequently. You notice that the required data blocks are getting aged out of the default buffer cache.How would you guarantee that the blocks for the table never age out、

  A.Configure the KEEP buffer pool and alter the table with the corresponding storage clause.

  B.Increase the database buffer cache size.

  C.Configure the RECYCLE buffer pool and alter the table with the corresponding storageclause.

  D.Configure Automata Shared Memory Management.

  E.Configure Automatic Memory Management

  开始考试点击查看答案
• 9You conned using SQL Plus to the root container of a multitenant container database (CDB) with SYSDBA privilege.The CDB has several pluggable databases (PDBs) open in the read/write mode.There are ongoing transactions in both the CDB and PDBs.What happens alter issuing the SHUTDOWN TRANSACTIONAL statement、

  A.The shutdown proceeds immediately.The shutdown proceeds as soon as all transactions in the PDBs are either committed or rolled hack.

  B.The shutdown proceeds as soon as all transactions in the CDB are either committed or rolled back.

  C.The shutdown proceeds as soon as all transactions in both the CDB and PDBs are either committed or rolled back.

  D.The statement results in an error because there are open PDBs.

  开始考试点击查看答案
• 10You are planning the creation of a new multitenant container database (CDB) and want to store the ROOT and SEED container data files in separate directories.You plan to create the database using SQL statements.Which three techniques can you use to achieve this、

  A.Use Oracle Managed Files (OMF).

  B.Specify the SEED FILE_NAME_CONVERT clause.

  C.Specify the PDB_FILE_NAME_CONVERT initialization parameter.

  D.Specify the DB_FILE_NAMECONVERT initialization parameter.

  E.Specify all files in the CREATE DATABASE statement without using Oracle managed Files (OMF).

  开始考试点击查看答案