1z0-062

1z0-062 practice questions, page 10 of 16, with answer review and explanations.

Question 46

Which three features work together, to allow a SQL statement to have different cursors for the same statement based on different selectivity ranges? (Choose three.)

  1. Bind Variable Peeking
  2. SQL Plan Baselines
  3. Adaptive Cursor Sharing
  4. Bind variable used in a SQL statement
  5. Literals in a SQL statement

Question 47

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?

  1. Compare Period ADDM report
  2. AWR Compare Period report
  3. Active Session History (ASH) report
  4. Taking a new snapshot and comparing it with a preserved snapshot

Question 48

You want to capture column group usage and gather extended statistics for better cardinality estimates for the CUSTOMERS table in the SH schema. 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.

  1. 3, 2, 1, 4
  2. 2, 3, 4, 1
  3. 4, 1, 3, 2
  4. 3, 2, 4, 1

Question 49

Which three statements are true about Automatic Workload Repository (AWR)? (Choose three.)

  1. All AWR tables belong to the SYSTEM schema.
  2. The AWR data is stored in memory and in the database.
  3. The snapshots collected by AWR are used by the self-tuning components in the database
  4. 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.
  5. AWR contains system wide tracing and logging information.

Question 50

You upgraded your database from pre-12c to a multitenant container database (CDB) containing pluggable databases (PDBs). Examine the query and its output: Which two tasks must you perform to add users with SYSBACKUP, SYSDG, and SYSKM privilege to the password file? (Choose two.)

  1. Assign the appropriate operating system groups to SYSBACKUP, SYSDG, SYSKM.
  2. Grant SYSBACKUP, SYSDG, and SYSKM privileges to the intended users.
  3. Re-create the password file with SYSBACKUP, SYSDG, and SYSKM privilege and the FORCE argument set to No.
  4. Re-create the password file with SYSBACKUP, SYSDG, and SYSKM privilege, and FORCE arguments set to Yes.
  5. Re-create the password file in the Oracle Database 12c format.