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High-Availability Data Replication (Enterprise/Workgroup Editions)
In This Chapter
High-Availability Data Replication
HDR Modes
Type of Data Replicated
Advantages of Data Replication
Primary and Secondary Database Servers
HDR Versus Mirroring
HDR Versus Two-Phase Commit
HDR and Enterprise Replication
How HDR Works
How Data Initially Replicates
Reproduction of Updates to the Primary Database Server
How the Log Records Are Sent
HDR Buffers
When Log Records Are Sent
Synchronous Updating
Asynchronous Updating
Threads That Handle HDR
Checkpoints Between Database Servers
How Data Synchronization Is Tracked
HDR Failures
HDR Failures Defined
Detection of HDR Failures
Actions When an HDR Failure Is Detected
Considerations After HDR Failure
Actions to Take If the Secondary Database Server Fails
Actions to Take If the Primary Database Server Fails
Redirection and Connectivity for Data-Replication Clients
Designing Clients for Redirection
Directing Clients Automatically with DBPATH
How the DBPATH Redirection Method Works
What the Administrator Needs to Do
What the User Needs to Do
Directing Clients with the Connectivity Information
How Redirection with the Connectivity Information Works
Changing the Connectivity Information
Connecting to the Database Server
Directing Clients with INFORMIXSERVER
How Redirection Works with INFORMIXSERVER
What the Administrator Needs to Do
What the User Needs to Do
Handling Redirection Within an Application
Comparing Different Redirection Mechanisms
Designing HDR Clients
Setting Lock Mode to Wait for Access to Primary Database Server
Designing Clients to Use the Secondary Database Server
No Data Modification Statements
Locking and Isolation Level
Use of Temporary Dbspaces for Sorting and Temporary Tables
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