[infinispan-issues] [JBoss JIRA] (ISPN-2454) The current SQL query that checks table existence is under optimized on big database

[Nicolas Filotto (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-2454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12735189#comment-12735189 ] 

Nicolas Filotto commented on ISPN-2454:
---------------------------------------

It seems that the Query for MS SQL doesn't work on MS SQL 2008 R2, it should be
{code}
SELECT count(*) from (SELECT TOP (1) 1 as C FROM " + tableName + ") T
{code}
                
> The current SQL query that checks table existence is under optimized on big database
> ------------------------------------------------------------------------------------
>
>                 Key: ISPN-2454
>                 URL: https://issues.jboss.org/browse/ISPN-2454
>             Project: Infinispan
>          Issue Type: Enhancement
>          Components: Loaders and Stores
>    Affects Versions: 5.1.0.FINAL
>            Reporter: Nicolas Filotto
>            Assignee: Mircea Markus
>              Labels: jdg, jdg6
>             Fix For: 6.0.0.Final
>
>
> Last year I proposed an enhancement allowing to use the implicit db schema to ease life of end-user, unfortunately it seems that it affects the startup time of the product when the tables contain a lot of rows. Indeed the query can take several seconds to return a result.
> The idea of this task would be to optimize this query for all supported databases in order to avoid this drawback.

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