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Posted to oak-issues@jackrabbit.apache.org by "Andrei Dulceanu (Jira)" <ji...@apache.org> on 2021/01/21 12:41:06 UTC

[jira] [Updated] (OAK-8908) RDBBlobStore on SQL Server: bad performance when default collation is of type SQL*

     [ https://issues.apache.org/jira/browse/OAK-8908?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrei Dulceanu updated OAK-8908:
---------------------------------
    Fix Version/s:     (was: 1.38.0)
                   1.40.0

> RDBBlobStore on SQL Server: bad performance when default collation is of type SQL*
> ----------------------------------------------------------------------------------
>
>                 Key: OAK-8908
>                 URL: https://issues.apache.org/jira/browse/OAK-8908
>             Project: Jackrabbit Oak
>          Issue Type: Technical task
>          Components: rdbmk
>            Reporter: Julian Reschke
>            Priority: Major
>             Fix For: 1.40.0
>
>         Attachments: OAK-8908-1.6.diff, OAK-8908.diff
>
>
> RDBBlobStore uses a 64-char primary key (digest in hex).
> Unfortunately, this causes performance issues on MS SQL Server, when the collation for that column is of type "SQL*" (see links). These types of collations are deprecated, but still the default for installations on the "EN_US" locale.
> The performance loss can be observed by changing the collation on an existing install, and then enable performance logging on RDBBlobStore.



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