Free 1Z0-082 Database Maintenance Questions and Answers — Questions and Answers
Question 1: Which Oracle tool is primarily used for performing database maintenance tasks such as backup and recovery?
- Oracle Enterprise Manager (OEM) (Correct answer)
- SQL*Loader
- Oracle Text
- Oracle Net Manager
Correct answer: Oracle Enterprise Manager (OEM)
Oracle Enterprise Manager (OEM) is a comprehensive suite of tools designed for managing and monitoring Oracle environments. It provides a graphical interface and robust capabilities for performing various database maintenance tasks, including backup and recovery, performance tuning, and security management. The other options are specialized tools for specific functions, not general maintenance.
Question 2: Which of the following is a proactive database maintenance task to prevent tablespace overflow?
- Rebuilding indexes
- Increasing the size of datafiles or adding more datafiles to a tablespace (Correct answer)
- Creating user roles
- Auditing user activities
Correct answer: Increasing the size of datafiles or adding more datafiles to a tablespace
Tablespace overflow occurs when a tablespace runs out of free space to store new data, leading to errors. Proactively increasing the size of existing datafiles (if they are autoextensible) or adding new datafiles to the tablespace ensures sufficient storage capacity. This prevents data insertion failures and maintains database availability, making it a key proactive maintenance task.
Question 3: What is the purpose of the ANALYZE command in Oracle Database maintenance?
- To update statistics for the optimizer (Correct answer)
- To create a new tablespace
- To back up the database
- To grant user privileges
Correct answer: To update statistics for the optimizer
The `ANALYZE` command (or more commonly, `DBMS_STATS` procedures) is used to collect statistics about database objects like tables, indexes, and columns. These statistics are vital for the Oracle optimizer to determine the most efficient execution plan for SQL queries. Accurate statistics help the optimizer choose the best access paths, leading to improved query performance.
Question 4: Which Oracle utility is used to reorganize tables and indexes to reclaim unused space?
- SQL*Plus
- Data Pump
- Export/Import
- DBMS_REDEFINITION (Correct answer)
Correct answer: DBMS_REDEFINITION
The `DBMS_REDEFINITION` package allows for online redefinition of tables, which can be used to reorganize tables and their associated indexes. This process helps reclaim unused space, improve storage efficiency, and enhance performance without requiring significant downtime. Other utilities like SQL*Plus are general interfaces, and Data Pump/Export/Import are for data movement, not online reorganization.
Question 5: What is the main purpose of running the DBMS_STATS.GATHER_SCHEMA_STATS procedure in Oracle?
- To recover lost data
- To optimize query performance by updating statistics for all objects in a schema (Correct answer)
- To create a new user
- To manage database connections
Correct answer: To optimize query performance by updating statistics for all objects in a schema
The `DBMS_STATS.GATHER_SCHEMA_STATS` procedure is used to collect and update optimizer statistics for all tables, indexes, and columns within a specified schema. Accurate statistics are crucial for the Oracle optimizer to generate efficient execution plans for SQL queries. By keeping statistics up-to-date, this procedure significantly improves overall query performance.
Free 1Z0-082 Database Maintenance Questions and Answers
Which Oracle tool is primarily used for performing database maintenance tasks such as backup and recovery?