Omron NX701-1620 User Manual page 291

 NJ101-20
DB type
Oracle Database 11g
SQL Server 2012
DB2 10.5
MySQL 5.6
Storage engine: InnoDB
Firebird 2.5
PostgreSQL 9.4
Percentage of task execution time: 50%
 Countermeasures
1
. Measure the execution time of the DB Connection Instruction in reference to B-1-3 How to Measure
Execution Time of DB Connection Instructions. If the execution time of the DB Connection
Instruction exceeds the acceptable range of the equipment, take the following actions.
 Execute a dummy DB_Insert instruction once after executing the DB_CreateMapping instruction
as a preparation for starting the actual operation.
Phenomenon 3: When Communications or SD Memory Card Processing was
Executed in the CPU Unit, Execution Time of a DB Connection Instruction Got Longer
 Possible causes
The following can be the causes:
1
. The sufficient processing time may not be allocated to the DB Connection Service that is executed
as a system service due to execution of communications or SD Memory Card processing.
 Countermeasures
1
. Reconsider the task design so that the sufficient execution time can be allocated to the system
services in reference to B-1-4 Guideline for System Service Execution Time Ratio.
Phenomenon 4: Execution Time of DB Connection Instructions is Steadily Long
 Possible causes
The following can be the causes:
1
. The sufficient execution time may not be allocated to the system services.
 Countermeasures
1
. Reconsider the task design so that the sufficient execution time can be allocated to the system
services in reference to B-1-4 Guideline for System Service Execution Time Ratio.
NJ/NX-series Database Connection CPU Units User's Manual (W527)
Reference value for
Instruction
instruction execution time
DB_Insert 28.2 ms
35.6 ms
DB_Insert
52.7 ms
DB_Insert
59.3 ms
DB_Insert
32.6 ms
DB_Insert
DB_Insert 32.1 ms
Measurement condition
When executing an INSERT
operation for 100-column record
When executing an INSERT
operation for 100-column record
When executing an INSERT
operation for 100-column record
When executing an INSERT
operation for 100-column record
When executing an INSERT
operation for 100-column record
When executing an INSERT
operation for 100-column record
Appendix B
B
B-15