Features of LINC Generate - Public Support Login - Unisys

New Features for MCP Based LINC Systems
See your DMS II Utilities Options Guide for guidelines on deciding whether it is more
efficient to rebuild the set or subset from the data set, or to rebuild from the set or subset
itself.
Correct Calculation of Blocksize
In LINC II Releases 16.1 and 16.2, blocksizes were calculated incorrectly for some
structures, and were different to the sizes shown on the DASDL Options (CDLA) screen in
LINC Generate.
In LINC Release 16.3, blocksizes are calculated correctly. Structures affected are those
that are a half byte less than a multiple of 6 bytes (for example, 17.5 and 23.5 bytes) and
that have defaults set on their DASDL Options screen.
Note: This change may lead to unexpected reorganizations of your LINC Databases
after migration.
Avoiding reorganization
To avoid reorganizations due to blocksize changes:
1. Open the file system/SOURCE/DMS.
2. Identify the structures that are affected by this change.
Look at the trailer records which contain the record lengths. The trailer record begins
with %%%%%TRAILER, and the record length is in a 6 digit field at position 39. This
field includes one decimal, so that the value 000175 indicates a record of length of
17.5 bytes (which would be affected).
3. Access the DASDL Options screen in LINC Generate.
4. For each structure you identified in Step 2, enter the blocksize value from LINC II
Releases 16.1 or 16.2.
You can now generate your LINC System.
Use of Connection Libraries for HUB
Prior to LINC Release 16.3, default timeout values were used to detect client or server
program failure for HUB (external Automatic Entry) transactions.
In LINC Release 16.3, the HUB facility uses the Connection Library system software
feature, which enables the establishment of a two-way interface with calling LINC
Systems. This can lead to improved response. In addition, an abort of any attached
program is detected, enabling immediate transaction aborting or recovery procedures
(depending on the transaction status of the particular program that aborted).
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