Bug 24154 - Parameter binding perfomance really slow, partial fix can be provided
Summary: Parameter binding perfomance really slow, partial fix can be provided
Status: NEW
Alias: None
Product: Class Libraries
Classification: Mono
Component: Mono.Data.Sqlite ()
Version: unspecified
Hardware: All All
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2014-10-30 08:27 UTC by Toni Martir
Modified: 2014-10-30 08:27 UTC (History)
1 user (show)

Is this bug a regression?: ---
Last known good build:

Notice (2018-05-24): bugzilla.xamarin.com is now in read-only mode.

Please join us on Visual Studio Developer Community and in the Xamarin and Mono organizations on GitHub to continue tracking issues. Bugzilla will remain available for reference in read-only mode. We will continue to work on open Bugzilla bugs, copy them to the new locations as needed for follow-up, and add the new items under Related Links.

Our sincere thanks to everyone who has contributed on this bug tracker over the years. Thanks also for your understanding as we make these adjustments and improvements for the future.

Please create a new report for Bug 24154 on GitHub or Developer Community if you have new information to add and do not yet see a matching new report.

If the latest results still closely match this report, you can use the original description:

  • Export the original title and description: GitHub Markdown or Developer Community HTML
  • Copy the title and description into the new report. Adjust them to be up-to-date if needed.
  • Add your new information.

In special cases on GitHub you might also want the comments: GitHub Markdown with public comments

Related Links:

Description Toni Martir 2014-10-30 08:27:49 UTC
Executing a query with a bunch of parameters, a hundred for example, is really slow.

This happens with named and unnamed parameters (they are like unnamed parameters).

So executing 10.000 inserts with a hundred parameters each one can take near a minute.

The parameter list is not indexed so for each asignment lot of string comparisons are done.
Indexing the list enhace the performance a lot, but of course best performance is to fix unnamed parameters behaviour avoiding any string comparisons.

I downloaded the source and introduced a fix that Works really fast, about 20.000 inserts per second in a Android device that previously worked at a rate of 20.000 per minute.

This fix only Works for unnamed parameters, and I'm not sure it Works for multiple statement commands.

I can provide you the modified files.