The forum will experience an outage sometime between February 10 at 7:00pm EST and February 12 at 11:59 EST for installation of security updates. The actual time and duration of the outage are unknown but attempts will be made to minimize the downtime. We apologize for any inconvenience.

This question is prompted by the new server properties introduced in Version 17...

CurrRead The current number of file reads that were issued by the database server, but that have not completed yet.

CurrWrite The current number of file writes that were issued by the database server, but that have not completed yet.

The addition of those properties implies that the database properties of the same name may in fact be reliable; is that true?

The question is important because historically the CurrIO database property has been so wildly inaccurate as to be completely useless.

Tue, Nov 8, 2011 at 10:00 AM... You are correct. Dan had already identified this as an issue with his Fuji testing: Yes, I recently found out that the CurrIO stat is completely bogus; it sits in a layer of the code that has many callpaths and not all are properly accounted for.

So... can we now trust the database properties CurrRead and CurrWrite in SQL Anywhere 17?

How about Version 16, and earlier releases?

asked 21 Nov '15, 16:23

Breck%20Carter's gravatar image

Breck Carter
26.6k418576824
accept rate: 21%

edited 21 Nov '15, 16:24


There was a change to address the inaccuracies of these I/O counters. This fix made it into the 17 release but not to branches before that.

permanent link

answered 23 Nov '15, 13:54

Nick%20Elson%20SAP%20SQL%20Anywhere's gravatar image

Nick Elson S...
6.2k2890
accept rate: 30%

Hooray!

Now I can un-comment the code in Foxhound, at least for V17 target databases, to display CurrIO etcetera... incomplete I/O can be a bad sign for performance.

(25 Nov '15, 15:26) Breck Carter
Your answer
toggle preview

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here

By RSS:

Answers

Answers and Comments

Markdown Basics

  • *italic* or _italic_
  • **bold** or __bold__
  • link:[text](http://url.com/ "title")
  • image?![alt text](/path/img.jpg "title")
  • numbered list: 1. Foo 2. Bar
  • to add a line break simply add two spaces to where you would like the new line to be.
  • basic HTML tags are also supported

Question tags:

×3

question asked: 21 Nov '15, 16:23

question was seen: 397 times

last updated: 25 Nov '15, 15:26