Discuss how to back up Oracle databases

Oracle has a lot to learn about. Here we mainly introduce Oracle database backup, including the Data Guard architecture. Remote disk image is a widely used data protection technology. However, due to its inherent limitations, this makes it impossible to implement complete database backup. Therefore, this article proposes to use the Data Guard Technology of Oracle Disaster Tolerance to completely implement Oracle database backup.

Data Guard is a database Disaster Tolerance Technology proposed by Oracle. It provides a management, monitoring, and automatic operation architecture for creating and maintaining one or more backup databases. The fundamental difference from remote Disk Mirroring is that Data Guard maintains Data consistency between production and backup databases by transmitting and running database log files logically. Once the database is unavailable due to a certain situation, the backup database will switch normally or fail over to the new production database to achieve the goal of no data loss or minimizing data loss, provides continuous data service capabilities for business systems.

Data Guard Architecture

A Data Guard environment can be configured with a production database and up to 9 backup database systems. net technology interconnection, and there is no distance limit on the physical backup database physically provides a consistent image with the production database at the data block level. Physical backup databases use the Redo Apply technology to ensure data mirroring capabilities.

The logical backup database uses the SQL Apply (Log Miner) technology to restore the received Log files to SQL statements and execute them on the logical backup database to achieve data consistency.

Data Guard protection mode
◆ Maximum protection mode: This mode sacrifices the performance of production databases in exchange for data loss-free capabilities.
◆ Maximum available mode: This mode also provides no data loss and has little impact on the production database.
◆ Maximum performance mode: This mode allows a small amount of data loss, but can provide the maximum performance for the production database.

Comparison with remote disk image technology

Comparison of Data Guard and remote Disk Mirroring Technology: Remote Disk Mirroring Technology is a Data protection solution at the storage layer. For Oracle database backup, Oracle Data Guard provides more effective and feasible solutions, more comprehensive database Disaster Tolerance solutions.

1. Analysis and Discussion on Oracle Database Restoration
2. Oracle remote disk image
3. New Oracle 11g function display
4. Detailed analysis of Oracle XML data
5. Oracle Data Guard