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D Glossary
276 U929-J-Z125-9-76
distributed transaction
Transaction that addresses at least one remote configuration. A transaction can
be distributed over:
–UDS-D,
– openUTM-D,
– UDS-D and openUTM-D.
distribution pool
Area in the independent DBH used for communication between UDSCT, server
tasks, user tasks and the master task with regard to UDS-D-specific data. The
distribution pool contains the distribution table and the UDS-D-specific system
tables.
distribution table
Table created by UDS-D using the input file assigned in the distribution pool.
With the aid of the distribution table, the distribution component in the user task
decides whether a processing chain should be processed locally or remotely.
Assigned in the distribution table are:
subschema - database
database - configuration
configuration - host computer.
DML
Data Manipulation Language: language for accessing a UDS/SQL database.
dummy subtransaction
A primary subtransaction is created by UDS-D when the first READY statement
in a transaction addresses a remote database.
A dummy subtransaction is used to inform the local configuration of the trans-
action so that the database can be recovered following an error.
duplicates header
Contains general information on a duplicates table or a page of a duplicates table,
i.e.
– chaining reference to the next and previous overflow page
– the number of free bytes in the page of the duplicates table.