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If SQL Anywhere is having difficulty handling a query against a remote table, it is usually helpful to understand how SQL Anywhere is executing the query. You can display remote tracing, as well as a description of the query execution plan:
SET OPTION cis_option = 7
Once you have turned on remote tracing, the tracing information appears in the Server Messages window. You can log this output to a file by specifying the -o server option when you start the database server.
For more information about using the cis_option option for debugging queries when using remote data access, see cis_option option [database].
For more information about the -o server option, see -o server option.