TurboIMAGE/XL Database Management System Reference Manual MPE/iX V6.5 (30391-90011)

674 AppendixH
TurboIMAGE/XL versus TurboIMAGE/V
Overview
– If logging to disk, the user log file and the database must be
in the same volume set. If logging to tape, the database
must be on the system volume set.
Run-Time Control Blocks – Mapped files are used for control blocks.
– A control block called the Database User Local Index
(DBUX), which is unique to a process, has been added. It
contains dynamic roll-back information, as well as the
addresses and file numbers of all the DBUs and DBRs
belonging to a specific process.
– The database ID number returned by DBOPEN now serves as
an index into the DBUX.
Status Area – Status elements 5, 7, 8, and 10 are modified for Native
Mode (NM) applications.
– For condition code -9, elements 2, 3, and 4 have a new
format for both Compatibility Mode (CM) and NM
applications.
TURBO Trace and
Profiler
– TURBO Trace and Profiler are not available.
Third-Party Indexing – If your database is configured for indexing using a
supported third-party product, you have the capability to do
generic key searches, multiple keyword retrievals, and
sorted sequential searches on that database using the
DBFIND and DBGET intrinsics. Refer to your third-party
vendor documentation for details.
B-Tree Indices – If a B-tree index exists on the key item of the master, allows
you to do generic and range searches using this key item, or
search items of its corresponding detail data sets. DBFIND
can be used both for master and detail. New feature for
TurboIMAGE/XL; not in TurboIMAGE/V.
Master and Detail Data
Set Expansion
– Data set can be expanded dynamicallyaccording to capacity
expansion parameters. New feature for TurboIMAGE/XL;
not in TurboIMAGE/V.
Jumbo Data Sets – Allows you to create data sets greater than 4 gigabytes.
New feature for TurboIMAGE/XL; not in TurboIMAGE/V.
Dynamic Multiple
Database Transaction
(DMDBX)
– This is an extension of the dynamic transaction for a single
database. The dynamic transaction can span 1-15
databases. New feature for TurboIMAGE/XL; not in
TurboIMAGE/V.
Deadlock Detection – Database can be activated for deadlock detection to avoid
system hangs. New feature for TurboIMAGE/XL; not in
TurboIMAGE/V.
Table H-1. TurboIMAGE/XL Differences
Area Affected Changes/Additions