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For which one would you use an index fast full scan to improve performance? A. a query having all the columns of an index in the where clause B. a query that does not need to access table rows C. a query that needs to access table rows along with an index D. a column in an index that is compressed Answer: A Explanation: All of the columns required by SQL must reside in the index tree; that is, all columns in the SELECT and WHERE clauses must exist in the index. Reference: http://www.dba-oracle.com/t_index_fast_full_scan.htm
Which two would automatically create an entry in V$SQL_MONITOR? A. a parallelized SQL statement B. any SQL statement run C. any DML statement D. a statement that consumes at least 1 second of CPU or I/O time. E. a statement that consumes at least 5 second of CPU or I/O time. F. any DDL statement Answer: C,F Explanation: Reference: https://docs.oracle.com/database/121/TGSQL/tgsql_monit.htm#TGSQL789
As of Oracle Database 12c, which functionality to access database diagnostic and performance has been superseded by Oracle Enterprise Manager Database Express? A. SQL Developer B. SQL Plus C. Database console D. SQL Express E. Grid Control Answer: C
Upon migration to Oracle Database 12c, a customer asked that monitoring at an individual database level be disabled in favor of database performance monitoring consolidated and centralized across their enterprise. Which are two actions you would take to meet the customer’s requirements? A. Disable Oracle Enterprise Manager Database Express by setting the HTTP Port to 0. B. For the always active Oracle Enterprise Manager Database Express process, create a script that will disable that process upon database boot. C. Using the appropriate architecture implement Oracle Enterprise Manager. D. Delete the “express” directory in Oracle Home to disable Oracle Enterprise Manager Database Express. E. Changes permissions of the “express” directory to real only by root. F. Enable SNMP and configure MIBS on each database and forward database monitoring SNMP traps. Answer: B,E
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