Data guard redo compression

  • How does Data Guard work?

    The Data Guard maintains the standby database by transmitting and applying redo data from the primary database.
    If the primary database becomes unavailable, then you can use Data Guard to switch or fail over the standby database to the primary role.
    The standby databases in OCI are physical standbys..

  • How does Oracle Advanced compression work?

    Advanced Network Compression reduces the size of the session data unit (SDU) transmitted over a data connection.
    Reducing the size of data reduces the time required to transmit the SDU.
    Advanced Network Compression not only makes SQL query responses faster but also saves bandwidth..

  • What does Data Guard do?

    Oracle Data Guard provides a comprehensive set of services that create, maintain, manage, and monitor one or more standby databases to enable production Oracle databases to survive disasters and data corruptions.
    Oracle Data Guard maintains these standby databases as copies of the production database..

  • What is the best practice for standby redo logs?

    Standby Redo Log Count Should be Equal or Higher than Online Redo Logs.
    The Best practice is to have 1 Standby Redo Log file higher than Online Redo Log files.
    When you create SRLs in the standby, create SRLs in the primary as well.
    They will normally never be used..

  • What is the use of standby redo logs in Data Guard?

    Standby redo logs are equivalent to online redo logs on a physical standby database.
    When standby redo logs are created on the standby site, the log transfer service updates the standby redo logs, which is then archived in the form of archive redo logs by the archiver process running on the standby site..

  • LNS (log-write network-server) and ARCH (archiver) processes running on the primary database select archived redo logs and send them to the standby-database host, where the RFS (remote file server) background process within the Oracle instance performs the task of receiving archived redo logs originating from the
  • To determine if there is any lag on the standby database, and if this is a transport or apply lag, query the V$DATAGUARD_STATS view.
Aug 7, 2023In certain environments, redo compression can: Improve data protection by reducing redo transport lag.

Can redo data be transmitted in a compressed format?

Redo data can be transmitted in a compressed format when the Oracle Data Guard configuration uses either synchronous redo transport (SYNC) or asynchronous redo transport (ASYNC).
Business requirements are not the same for all data in a database.

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Does Oracle Database 11g compress redo?

Oracle Database 11g has the ability to compress redo as it is transmitted over a network by Data Guard Redo Transport Services.
Redo transport compression is a feature of the Oracle Advanced Compression option.
You must purchase a license for this option before using the redo transport compression feature.

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What is an Oracle Data Guard configuration?

An Oracle Data Guard configuration requires that Oracle redo transport services be configured and monitored.
Redo transport services performs the automated transfer of redo data between members of an Oracle Data Guard configuration.
This guide describes how to create and manage physical, logical, and snapshot standby databases.

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What is Oracle Data Guard redo transport performance?

Oracle Data Guard redo transport performance is directly dependent on the performance of the primary and standby systems, the network that connects them, and the I/O subsystem.
For most Oracle Data Guard configurations, you should be able to achieve zero or minimal data loss by troubleshooting and tuning redo transport.

Scope

Compression is most beneficial in achieving recovery point objectives (RPO) when used over low bandwidth networks. As a general statement

Details

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Does Oracle Database 11g compress redo?

Oracle Database 11g has the ability to compress redo as it is transmitted over a network by Data Guard Redo Transport Services

Redo transport compression is a feature of the Oracle Advanced Compression option

You must purchase a license for this option before using the redo transport compression feature

What is advanced compression in Oracle Data Guard?

Advanced Compression includes compression for backup data when you employ Oracle Recovery Manager (RMAN) or Oracle Data Pump for database backups

Data Guard Redo Transport Compression

Enables the compression of Oracle Data Guard (primary to standby database) redo data as it is transmitted over the network

What is Oracle Data Guard redo transport performance?

Oracle Data Guard redo transport performance is directly dependent on the performance of the primary and standby systems, the network that connects them, and the I/O subsystem

For most Oracle Data Guard configurations, you should be able to achieve zero or minimal data loss by troubleshooting and tuning redo transport


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