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DataServer for Microsoft SQL Server
Additional Features to Enhance DataServer Performance : Modifying the run-time schema check : Skip schema verification

Skip schema verification

When r-code runs (each time a table, view, or buffer is opened), the DataServer checks the data definitions of the MS SQL Server data source to ensure the data definitions match the schema definitions in the schema holder. If the definitions do not match, the DataServer returns an error.
Unmatched definitions can cause corruption of data. For this reason, checking the integrity of data definitions at run time ensures the data corruption due to unmatched definitions will not occur. The skip schema check feature can be used to bypass this check at run time. Because definition verification is time consuming in a production environment, you might consider using the -Dsrv skip_schema_check startup parameter if your environment allows. You might consider using this option to increase performance, but only if you are certain that the data definitions in the data source match your schema holder definitions.
Note: The dataserv.lg log file denotes when the DataServer skips the schema check.
The following example shows how to use the -Dsrv parameter with the skip schema check option in the CONNECT statement:
CONNECT data-source-name -ld logical-name -dt MSS
-Dsrv skip_schema_check
Caution: If you use the skip schema check option, the DataServer skips the schema check and does not detect discrepancies between the schema definitions and the data definitions. If there are discrepancies and the DataServer continues to process queries, inserts, and deletions, your data can become corrupted. Progress Software Corporation recommends that you weigh carefully the performance benefit against the risk to your database before deciding to use -Dsrv skip_schema_check.