Application Programming and SQL Guide - Kmlinux

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LOB lock and LOB table space lock duration . . . . . . . . . . . . 419
Instances when LOB table space locks are not taken . . . . . . . . . 420
The LOCK TABLE statement for LOBs . . . . . . . . . . . . . . . 420
Chapter 19. Planning for recovery . . . . . . . . . . . . . . . . 421
Unit of work in TSO batch and online . . . . . . . . . . . . . . . . 421
Unit of work in CICS . . . . . . . . . . . . . . . . . . . . . . 422
Unit of work in IMS online programs . . . . . . . . . . . . . . . . 423
Planning ahead for program recovery: Checkpoint and restart . . . . . . 425
When are checkpoints important? . . . . . . . . . . . . . . . . 426
Checkpoints in MPPs and transaction-oriented BMPs . . . . . . . . . 426
Checkpoints in batch-oriented BMPs . . . . . . . . . . . . . . . 427
Specifying checkpoint frequency . . . . . . . . . . . . . . . . . 427
Unit of work in DL/I and IMS batch programs . . . . . . . . . . . . . 428
Commit and rollback coordination . . . . . . . . . . . . . . . . 428
Restart and recovery in IMS batch . . . . . . . . . . . . . . . . 429
Using savepoints to undo selected changes within a unit of work . . . . . . 429
Chapter 20. Planning to access distributed data . . . . . . . . . . . 431
Planning for DRDA and DB2 private protocol access . . . . . . . . . . 431
Advantages of DRDA access . . . . . . . . . . . . . . . . . . 431
Moving from DB2 private protocol access to DRDA access . . . . . . . 432
Bind processes for DRDA and DB2 private protocol access . . . . . . . 434
Precompiler and bind options for DRDA access . . . . . . . . . . . 435
Coding methods for distributed data . . . . . . . . . . . . . . . . . 437
Using three-part table names to access distributed data . . . . . . . . 438
Using explicit CONNECT statements to access distributed data . . . . . 440
Coordinating updates to two or more data sources . . . . . . . . . . . 442
Working without two-phase commit . . . . . . . . . . . . . . . . 442
Update restrictions on servers that do not support two-phase commit . . . 442
Forcing update restrictions by using CONNECT (Type 1) . . . . . . . . 443
Maximizing performance for distributed data . . . . . . . . . . . . . . 443
Coding efficient queries . . . . . . . . . . . . . . . . . . . . 444
Maximizing LOB performance in a distributed environment . . . . . . . 444
Using bind options to improve performance for distributed applications 445
Using block fetch in distributed applications . . . . . . . . . . . . . 448
Limiting the number of DRDA network transmissions . . . . . . . . . 450
Limiting the number of rows returned to DRDA clients . . . . . . . . . 454
Working with distributed data . . . . . . . . . . . . . . . . . . . 455
SQL limitations at dissimilar servers . . . . . . . . . . . . . . . . 455
Executing long SQL statements in a distributed environment . . . . . . 456
Retrieving data from ASCII or Unicode tables . . . . . . . . . . . . 456
Accessing data with a scrollable cursor when the requester is down-level 457
Accessing data with a rowset-positioned cursor when the requester is
down-level . . . . . . . . . . . . . . . . . . . . . . . . 457
Maintaining data currency by using cursors . . . . . . . . . . . . . 457
Copying a table from a remote location . . . . . . . . . . . . . . 457
Transmitting mixed data . . . . . . . . . . . . . . . . . . . . 457
Part 5. Developing your application . . . . . . . . . . . . . . . . . . . . . 459
Chapter 21. Preparing an application program to run . . . . . . . . . 461
Steps in program preparation . . . . . . . . . . . . . . . . . . . 462
Step 1: Process SQL statements . . . . . . . . . . . . . . . . . 462
Step 2: Compile (or assemble) and link-edit the application . . . . . . . 479
Step 3: Bind the application . . . . . . . . . . . . . . . . . . . 480
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