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AdministeringIn addition to administering the database server, you can tune performance, replicate data, and archive data.
System administrationThese topics contain concepts, procedures, and reference information for database and database server administrators to use for managing and tuning HCL OneDB™ database servers.
Administrator's GuideThe HCL OneDB™ Administrator's Guide provides the information required to administer HCL OneDB™.
Distributed data
Multiphase commit protocols
Two-phase commit and logical-log records

Two-phase commit and logical-log records

The database server uses logical-log records to implement the two-phase commit protocol. You can use these logical-log records to detect heuristic decisions and, if necessary, to help you perform a manual recovery. (See Manually recovering from failed two-phase commit.)

The following logical-log records are involved in distributed transactions:

BEGPREP
PREPARE
TABLOCKS
HEURTX
ENDTRANS

For information about these logical-log records, see the chapter on interpreting the logical log in the HCL OneDB™ Administrator's Reference.

This section examines the sequence of logical-log records that are written during the following database server scenarios: