Kbase 19438: Promon I/O Operations by Process
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
2/2/2000 |
|
Promon I/O Operations by Process
INTRODUCTION
=============
Since there is not much available information about the
Promon I/O Operations by Process, this knowledgebase entry
will give some additional information about this Promon option.
It can be found from the following PROMON menu:
R&D, 3.Other displays, I/O Operations by Process
WHY YOU NEED TO KNOW THIS:
===========================
There has been some requests about the means of this option.
SO WHAT ARE THESE I/O OPERATIONS EXACTLY SHOWN IN THE DISPLAY:
==============================================================
These I/O operations are made within the BUFFER POOL.
The value is updated in many different places in the
Progress C-code itself which mostly deal with Block Access
and waiting as follows.
All the following actions will increment the shown value:
- update a block
- check if we have a lock on a block
- get a lock on a block
- wait on a block
- re-read a block
- commit a block
- upgrade a lock on a block
If we are spinning on a block lock then we could increment this counter as well.
NOTE:
The information "locked block" is not within the LOCK TABLE
reserved for Records Locks plus Table Locks as from V9,
but on the block itself.
21-JAN-2000 Kari Helala
Progress Software Technical Support Note #19438