OpenEdge Data Management: DataServer for Microsoft SQL Server

Additional Features to Enhance DataServer Performance
4–10
Table 4–1 describes the query-tuning options.
Table 4–1: Query-tuning options (1 of 3)
ARRAY–MESSAGE
NO–ARRAY–MESSAGE
Option Description
Specifies whether the DataServer sends multiple result rows in a
single logical network message, thereby reducing network traffic.
Default: ARRAY–MESSAGE, if the query uses a lookahead cursor.
CACHE–SIZE integer Specifies the size in bytes of the cache used by lookahead cursors.
A larger cache size can improve performance for queries that
return a large number of records because the DataServer might
need fewer SQL statements to get the results. This value will
override a cache size specified with -Dsrv QT_CACHE_SIZE.
Minimum: The DataServer always caches at least one record.
Maximum: None.
Default: 30000.
DEBUG EXTENDED
DEBUG SQL
NO–DEBUG
JOIN–BY–SQLDB
NO–JOIN–BY–SQLDB
Specifies whether the DataServer should print to the
dataserv.lg file the debugging information that it generates for
a query.
Specify DEBUG SQL to print only the SQL that the DataServer
executes against the ODBC data source.
Specify DEBUG EXTENDED to print additional information, such as
cursor statistics.
Specify DEBUG option to override the NO–DEBUG default.
Default: NO–DEBUG.
Specifies whether the DataServer allows its data source to
perform a join (this usually improves performance).
JOIN–BY–SQLDB implies SEPARATE–CONNECTION queries that
include joins.
Default: JOIN–BY–SQLDB.
JOIN–BY–SQLDB is a compile-time option. A query must be
compiled to use or not use this option.
You can turn off the JOIN–BY–SQLDB default globally at compile
time by specifying the Server Join (-nojoinbysqldb) startup
parameter when you start an OpenEdge session. This parameter
does not override the explicit use of JOIN–BY–SQLDB in the
QUERY–TUNING phrase.