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DataDirect IDMS Extensions OCA-Commit
DataDirect's IDMS Extension OCA-Commit allows CICS transactions to perform two-phase commits between CA-IDMS and all other external resources supported by CICS, including DB2, IMS and MQSeries. OCA-Commit integrates CICS-IDMS run-units in the CICS resource coordinator two phase commit process. By calling the CICS SYNCPOINT instead of CA-IDMS COMMIT, transactions are able to obtain a synchronized automatic treatment between all supported external resource managers.
The two-phase commit protocol is a distributed algorithm which lets all participants in a distributed system agree to commit a transaction. The protocol results in either all participants committing the transaction or aborting it, even in the case of site failure and message losses.
The two-phase commit algorithm is broken into the PREPARE-TO-COMMIT phase, where the coordinator, in this case CICS, attempts to prepare all the participants, and the COMMIT phase, where the coordinator complete the transactions for all participants.
Key Features
- Full CICS two-phase commit support
- Two-phase commit supports with IMS, DB2, MQSeries and CA-IDMS
- Transparent to application
- Automated restarts
Safe and consistent multi-DBMS transactions
With the help of OCA-Commit, transactions can now access and update data in CA-IDMS and any other supported resource manager. System architects can now rest assured that transactional consistency will be maintained across all resources in case of failure. Enterprises can safely make use of all their resources simultaneously without fear that a system failure will leave their data in an inconsistent state.
Guaranteed transactional integrity
Using OCA-Commit, a CICS transaction can concurrently update two or more CA-IDMS databases and guarantee transactional integrity across all databases. Database segmentation suddenly becomes a lot more attractive.
Converting without loosing
There are many cases where it is deemed profitable to convert part or the totality of a system from one DBMS technology to another. This has traditionally been an almost intractable problem for CA-IDMS users because it was impossible to guarantee data integrity across DBMS. OCA- Commit now allows customers to move data and application to and from CA-IDMS.
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