Performances with SQL interruption

With some database drivers, performances can be impacted when using OPTIONS SQL INTERRUPT ON.

Starting with Genero BDL 3.20, dbmsnc / MS ODBC SQL database drivers have been reviewed to improve support for SQL interruption, by using asynchronous ODBC calls.

This solution requires additional overhead, that can slow down regular SQL statements which do not need SQL interruption handling.

Note: Most of SQL statements of a program do not need SQL interruption handling.

Instead of enabling SQL interruption with OPTIONS SQL INTERRUPT ON at the beginning of the program, consider enabling this option only for the execution of SQL queries that can be interrupted. This programming pattern is anyway a good practice, since SQL interruption requires exception handling that needs to be treated.

Note: To easily identify when OPTIONS SQL INTERRUPT ON/OFF is used in your programs, the FGLSQLDEBUG output has been enhanced to trace this instruction:

SQL: SQL INTERRUPT ON
 | 4gl source      : sqlint.4gl line=5
 | curr driver     : ident='dbmdefault'
 | curr connection : ident='_1' (dbspec=[test1])
 | Execution time  :   0 00:00:00.00003
...
SQL: SQL INTERRUPT OFF
 | 4gl source      : sqlint.4gl line=12
 | curr driver     : ident='dbmdefault'
 | curr connection : ident='_1' (dbspec=[test1])
 | Execution time  :   0 00:00:00.00003