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
URL:
Depends on:
Blocks:
 
Reported: 2014-10-30 08:27 UTC by Toni Martir
Modified: 2014-10-30 08:27 UTC (History)
1 user (show)

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

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Status:
NEW

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.