Improve SQL statement caching for SQL Server
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WTSupported in traditional Synergy on Windows
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WNSupported in Synergy .NET on Windows
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The SQLPERFORMANCESQL environment variable causes SQL Connection to use SQLDescribeParam internally to improve performance for SQL statements with I/O parameters when accessing SQL Server.
Value
Any value.
Discussion
Set this environment variable to any value to improve performance and avoid excessive cache memory thrashing for SQL statements with I/O parameters when accessing SQL Server (VTX12_SQLNATIVE). When this is set, SQL Connection calls the ODBC API function SQLDescribeParam internally for all SQL Server cursors. (For an option that invokes this functionality only for cursors opened on a specified database channel, see SSQL_PERFORMANCE_SQL.)
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This feature will work for a stored procedure only if the case of column names in the SQL statement matches the case of column names in the database. (This is a SQLDescribeParam limitation.) If inconsistent case prevents this feature from working, an %SSC_EXEC failure on SQLDescribeParam is written to the SSQLLOG file. See SQL Connection logging for information on SSQLLOG logging. |
Setting location
The environment or synergy.ini. For client/server configurations, set SQLPERFORMANCESQL on the client.
Used by
SQL Connection
Examples
SQLPERFORMANCESQL=1
