On 10/05/12 3:28am, Ramiro Aparicio wrote:
Hi,
I am trying to figure some way to get the number or queries and time elapsed in
a DataContext, or something similar, I want to get agregate data about DB
performance and be able to find where we should try to reduce the number of DB
queries.
I thought I could use some kind of ServletFilter to get the data and post back
as headers or something like that, but I don't se anywhere how I can get this
information, the best I can see is that all that information is logged but not
agregated, so maybe I could create a custom QueryLogger, but I can not see any
way to inject a custom QueryLogger either so I am lost.
Maybe this is a marginal use case but I think this is a interesting feature for
everyone using Cayenne in production enviroments to gather information without
having to parse the logs.
Ramiro Aparicio
I don't have an answer for you for how to do it, but I think it is a fine idea.
The latest Rails even has a mode you can enable which detects any query taking
longer than a certain number of seconds, and then automatically issues an
EXPLAIN to the database with the same query and puts the result in the logs.
And perhaps statistical data could be exposed with a JMX interface from
Cayenne? I've never had to write such a thing so I don't know what is involved,
but it certainly would be useful.
Ari
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Aristedes Maniatis
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