Oracle Database Administration from Zero to Hero - Managing the Redo Log (Part 1 of 4)

This lecture covers the redo log mechanism in Oracle databases, explaining how redo entries are generated, stored, and managed. It discusses the differences between no archive log and archive log modes, highlighting the benefits and limitations of each. The structure of redo log files, including groups and members, is detailed, along with the concept of redo log multiplexing for high availability. The lecture emphasizes the importance of managing redo logs for database recovery and normal operations.

What is the primary purpose of redo logs in a database?

• To record data changes for recovery

• To optimize query performance

• To manage user access

• To store user data

In no archive log mode, what happens to old redo entries?

• They are archived automatically

• They are overwritten

• They are stored indefinitely

• They are deleted manually

Which mode allows the use of advanced Oracle technologies like Data Guard?

• No archive log mode

• Recovery mode

• Archive log mode

• Backup mode

What is the role of the archiver process in archive log mode?

• To delete old redo logs

• To write redo entries to disk

• To manage user sessions

• To read redo entries and save them as archived logs

How are redo log files organized in a database?

• In groups with members

• In a hierarchical structure

• In a single file

• In multiple directories

What is redo multiplexing?

• Using multiple redo log files for the same entries

• Storing redo entries in multiple locations

• Backing up redo logs to cloud storage

• Encrypting redo log files

Why is it important to save redo log group members on separate disks?

• To reduce storage costs

• To ensure high availability

• To improve read speed

• To simplify database management

What should a DBA consider when managing redo log files?

• The size of the database

• The number of users

• The type of queries run

• The location of redo log members

What happens if the disk containing redo log members fails?

• The database stops functioning

• The database continues using surviving members

• All data is lost

• The database automatically repairs the disk

What is the DBA's responsibility regarding archived redo log files?

• To encrypt them

• To manage their storage and deletion

• To compress them

• To share them with users