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

["Julian Reschke (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OAK-8908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17037020#comment-17037020 ] 

Julian Reschke commented on OAK-8908:
-------------------------------------

Example for changing the collation:

 

{{use *_DBNAME_*}}

{{alter table DATASTORE_DATA drop constraint *_DATA_PK_*}}
 {{alter table DATASTORE_DATA ALTER COLUMN ID VARCHAR(64) COLLATE Latin1_General_CI_AS not null}}
 {{alter table DATASTORE_DATA add constraint *_DATA_PK_* primary key clustered (ID)}}

{{alter table DATASTORE_META drop constraint *_META_PK_*}}
 {{alter table DATASTORE_META ALTER COLUMN ID VARCHAR(64) COLLATE Latin1_General_CI_AS not null}}
 {{alter table DATASTORE_META add constraint *_META_PK_* primary key clustered (ID)}}

> RDB*Store 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
>            Assignee: Julian Reschke
>            Priority: Major
>             Fix For: 1.26.0
>
>
> 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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