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Knowledgebase
>>ITEM : R01002
>>DATE: 07/30/1997
>>TYPE: Information
>>TITLE: Btrieve Page Size Error (code 24)
>>PRODUCT(S):
RaSQL/B (all versions) for Clipper
RaSQL/B (all versions) for FoxPro Dos
>>PLATFORMS(S):
Btrieve for DOS version 5.x
>>SUMMARY:
Incorrect Btrieve startup parameters may generate
Btrieve Page Size error (error 24) when opening
or creating a Btrieve file.
>>MORE INFORMATION:
Btrieve files are created with page sizes in increments
from 512-4096 bytes per page. Btrieve has a startup
parameter which allows you to specify the largest
page size you expect to work with. (The default
maximum is usually 2048 bytes per page.) This
minimizes the Btrieve engine's memory footprint.
However, if an attempt is made to open a file that has
a larger page size than the maximum, a page size
error will occur.
In addition, if you use RaSQL/B to create a new
Btrieve file without specifying a specific page size
with N_XPAGESIZE, RaSQL/B calculates an
optimal page size based on calculations provided
by BTI (now Pervasive). If this page size exceeds
the maximum, a page size error will occur.
>>RESOLUTION/FIX:
Specify a larger page size (up to 4096) when starting
Btrieve. Use the "/P:nnnn" startup parameter, where
nnnn is the page size in 512 byte increments from
512-4096 (i.e., 512, 1024, 1536, 2048, 2560, 3072,
3584 or 4096). For example:
BTRIEVE /P:4096
If Btrieve warns there is not enough memory to
allocate this page size, try adding the /M:kk
parameter, where kk is the number of kilobytes
of memory to allocate to Btrieve. The default is
32, so try setting it to /M:40 and keep increasing
it by 2K until Btrieve loads properly. E.g.,
BTRIEVE /P:4096 /M:40
If you are only getting this error when creating
new files and you do not wish to increase the
amount of memory Btrieve allocates, you can
alternatively use N_XPAGESIZE to specify
the page size RaSQL/B should use to create
new Btrieve files.
E.g.,
N_XPAGESIZE(1536)
N_XAMAKETBL( ... )
We recommend that you upgrade to Btrieve for
DOS 6.15 or later as this is not a problem in
this environment. If using Btrieve 6.x you must
upgrade to either RaSQL/B 6.1x for Clipper
or RaSQL/B 2.1x for FoxPro.
>>SEE ALSO:
>>COPYRIGHT 1997 Communication Horizons
All rights reserved worldwide.
No distribution without specific consent of publisher.
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