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From "Vladimir Ozerov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (IGNITE-5382) SQL: frequent switch between schemas cause severe slowdown
Date Wed, 21 Jun 2017 13:47:00 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-5382?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vladimir Ozerov updated IGNITE-5382:
------------------------------------
    Fix Version/s: 2.1

> SQL: frequent switch between schemas cause severe slowdown
> ----------------------------------------------------------
>
>                 Key: IGNITE-5382
>                 URL: https://issues.apache.org/jira/browse/IGNITE-5382
>             Project: Ignite
>          Issue Type: Task
>          Components: cache, sql
>            Reporter: Vladimir Ozerov
>            Assignee: Sergey Kalashnikov
>              Labels: important, performance
>             Fix For: 2.1
>
>
> We have thread-bound cached connection to H2 database which is bound to specific schema.
See {{IgniteH2Indexing.connectionForThread}}.
> When query with different schema is executed, we call {{SET SCHEMA}} command, which is
rather expensive and may cause slowdown when queries form different caches are executed.
> To avoid this we should maintain thread-local map of such connections. Be careful with
concurrency and resource leaks.



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