This video discusses the properties of the Oracle redo logs and how the redo logs help assure the database will remain consistent after restarts or crashes.
- [Instructor] The Redo Log Files…store database change vectors,…which are events that represent modifications done…to database rows and the database table structure.…These Redo records are mainly used…by the Oracle Instance for crash recovery purposes.…Redo Logs are the Oracle name…for the database transaction log.…If you lose your database Redo Log Files,…you lose your database, and won't be able to start it up.…The Oracle database requires at least two Redo Log Files…at any given time, as it writes to them in a cyclic manner.…
Meaning, that the database writes…to the first Redo Log File,…and once that Redo Log File is filled up,…the database will start writing…to the second Redo Log File.…This is called a Redo Log switch.…Once the second Redo Log File was written to,…and is now full,…the database returns and writes back…to the first one, and vice versa.…That's why it's called a cyclic write.…While two is the minimum amount…of Redo Logs an Oracle database requires,…we can, and often should, create more.…
Typically, three, five, or seven Redo Logs are common.…
After completing this course, you'll have fundamentals required for installation, configuration, and administration of an Oracle 12c database.
- Database instance and storage
- Instance memory pools
- Instance background processes
- Client connections
- Database storage file types
- Control files and backup files
- Multitenant databases
- Starting and stopping the database
- Installing Oracle 12c software
- Using the developer tools
- Database management
Skill Level Beginner
2. Instance Memory Pools
3. Instance Background Processes
4. Client Connections
5. Physical Database Structures
6. Mulitenant Database
7. Start and Stop the Database
8. Install Oracle 12c software
9. Create a Database Instance
Use DBCA to create a database14m 58s
10. Tools for Developers and DBAs
Next steps1m 17s
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