OpenEdge Data Management: DataServer for Microsoft SQL Server

ODBC options
Wait time for asynchronous connections—the PRGRS_WAIT_DELAY option
The PRGRS_WAIT_DELAY switch allows you to determine the number of seconds you will
allow the DataServer to delay further execution while waiting for the ODBC driver to
respond to a request that may initiate a lock on a database resource. The delay is
initiated when the NO-WAIT option is used in your ABL and the DataServer is awaiting
a response to a database request made through the ODBC driver to MS SQL Server.
The PRGRS_WAIT_DELAY switch is ignored unless you are running in ODBC
asynchronous mode. Check your driver and OpenEdge connection requirements to
determine if you are allowed to run in asynchronous mode.
Preserve cursors—the -Dsrv MSS_PRESERVE_CURS,1 option
The -Dsrv MSS_PRESERVE_CURS,1 startup option allows server side cursors in
Microsoft SQL Server to be preserved beyond a transaction boundary. Under many
circumstances, preserved cursors can result in a significant performance improvement.
Enabling this feature can result in enhanced performance, but performance gains are
not guaranteed and in limited circumstances performance degrades. For this reason,
this option is disabled by default. To test if preserve cursors benefit your application,
enable this option by toggling the switch on with -Dsrv MSS_PRESERVE_CURS,1.
RECID Buffer size—the ZPRGRS_RECID_BUF_SIZE,nnn Option
The DataServer for MS SQL Server tries to select a unique index over each table
defined in your schema holder to support the Progress RECID/ROWID functions. RECID
functionality enables backward and forward scrolling in the DataServer product. The
RECID buffer is used to sort key information about the unique index selected to support
RECID. The default RECID buffer size is 245 bytes. The space is used dynamically to
allocate the RECID buffer for a given record. The RECID buffer size needs to be large
enough to contain all the key information regarding the unique index. If the unique
index selected is a composite of many columns or contains large column names, the
RECID key information might exceed the RECID buffer size and issue error message
2090. If you exceed the RECID buffer limit, Progress Software Corporation first
recommends that you try to find an alternative unique index with a smaller number of
key fields. This should help to improve performance during record access as well. You
can change the RECID index in the Data Dictionary by selecting the DataServer button
from the Table Properties of the table in your schema holder.
If it is not possible to change the selected RECID unique index for the table that is
causing the buffer overflow, you can expand the area by setting the startup option as
follows:
-Dsrv ZPRGRS_RECID_BUF_SIZE,nnn
Where nnn is the new size of the area in bytes. The range limits for nnn are inclusive
of values between 44 to 1024.
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