15.5.3 Notes about the maximum number SQL processing real threads
If you attempt to use multiple statement handles allocated by the same connection handle to execute SQL statements concurrently, but the number of processing real threads available does not match the maximum number of SQL processing real threads, SQL statement execution requests will result in an error (the requests will not be placed in wait status).
The maximum number of SQL processing real threads is specified in the following operands:
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adb_sql_exe_max_rthd_num in the server definition
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adb_sql_exe_max_rthd_num in the client definition