When the Open Query File (OPNQRYF) command is run, messages are
sent informing the interactive user of the status of the OPNQRYF request.
For example, if a keyed access path is built by the OPNQRYF command to satisfy
the request, a message is sent to the user.
The following messages might be sent during a run of the OPNQRYF
command:
| Message identifier |
Description |
|---|
| CPI4301 |
Query running. |
| CPI4302 |
Query running. Building access path... |
| CPI4303 |
Query running. Creating copy of
file... |
| CPI4304 |
Query running. Selection complete... |
| CPI4305 |
Query running. Sorting copy of file... |
| CPI4306 |
Query running. Building access path
from file... |
| CPI4307 |
Query running. Building hash table
from file &1 in &2. |
| CPI4011 |
Query running. Number of records
processed... |
|
To stop these status messages from appearing, you can see the
discussion about message handling in the Control language (CL) topic.
When your job is running under debug (by using the Start Debug
(STRDBG) command), or requested with query options file option of DEBUG_MESSAGES
*YES, messages are sent to your job log. These messages describe the implementation
method that is used to process the OPNQRYF request. These messages provide
information about the optimization processing that occurred. You can use these
messages as a tool for tuning the OPNQRYF request to achieve the best performance.
Listed here are these messages:
- CPI4321
- Access path built for file...
- CPI4322
- Access path built from keyed file...
- CPI4324
- Temporary file built from file...
- CPI4325
- Temporary file built for query
- CPI4326
- File processed in join position...
- CPI4327
- File processed in join position 1.
- CPI4328
- Access path of file that is used...
- CPI4329
- Arrival sequence that is used for file...
- CPI432A
- Query optimizer timed out...
- CPI432C
- All access paths considered for file...
- CPI432E
- Selection fields mapped to different attributes...
- CPI432F
- Access path suggestion for file...
- CPI433B
- Unable to update query options file.
- CPI4330
- &6 tasks used for parallel &10 scan of file &1.
- CPI4332
- &6 tasks used for parallel index that is created over file...
- CPI4333
- Hashing algorithm used to process join.
- CPI4338
- &1 access paths used for bitmap processing of file...
- CPI4339
- Query options retrieved file &2 in library &1.
- CPI4341
- Performing distributed query.
- CPI4342
- Performing distributed join for query.
- CPI4345
- Temporary distributed result file &4 built...
- CPI4346
- Optimizer debug messages for query join step &1 of &2 follow:
- CPI4347
- Query is processing in multiple steps.
Most of the messages provide a reason why the particular option
was performed. The second level text on each message gives an extended description
of why the option was chosen. Some messages provide suggestions to help improve
the performance of the OPNQRYF request.