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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (DERBY-3907) Save useful length information for Clobs in store
Date Wed, 18 Mar 2009 16:48:50 GMT

     [ https://issues.apache.org/jira/browse/DERBY-3907?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kristian Waagan resolved DERBY-3907.
------------------------------------

    Resolution: Fixed

I'll log at least one new issue, tracking the final piece of the functionality required to
insert the required meta data for Clobs inserted with one of the JDBC 4.0 "length-less overrides".

I don't think this issue requires a release note, but I'll comment on a few things before
I close the issue.

> Save useful length information for Clobs in store
> -------------------------------------------------
>
>                 Key: DERBY-3907
>                 URL: https://issues.apache.org/jira/browse/DERBY-3907
>             Project: Derby
>          Issue Type: Improvement
>          Components: JDBC, Store
>    Affects Versions: 10.5.0.0
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>             Fix For: 10.5.0.0
>
>         Attachments: derby-3907-1a-alternative_approach.diff, derby-3907-2b-header_write_preparation.diff,
derby-3907-2b-header_write_preparation.diff, derby-3907-2b-header_write_preparation.stat,
derby-3907-2c-header_write_preparation-PREVIEW.diff, derby-3907-2c-header_write_preparation-PREVIEW.stat,
derby-3907-2c-header_write_preparation.diff, derby-3907-2c-header_write_preparation.diff,
derby-3907-2c-header_write_preparation.stat, derby-3907-3a-readertoutf8stream_cleanup.diff,
derby-3907-3a-readertoutf8stream_cleanup.diff, derby-3907-3a-readertoutf8stream_cleanup.stat,
derby-3907-3b-readertoutf8stream_cleanup.diff, derby-3907-4a-add_getStreamWithDescriptor.diff,
derby-3907-4a-add_getStreamWithDescriptor.stat, derby-3907-5a-use_getStreamWithDescriptor.diff,
derby-3907-5a-use_getStreamWithDescriptor.stat, derby-3907-6a-SQLClob_stream_descriptor_sync.diff,
derby-3907-7a-write_new_header_format-PREVIEW.diff, derby-3907-7a-write_new_header_format.diff,
derby-3907-7a-write_new_header_format.diff, derby-3907-7a-write_new_header_format.stat, derby-3907-7a1-write_new_header_format.diff,
derby-3907-7a2-use_new_framework.diff, derby-3907-7a2-use_new_framework.stat, derby-3907-7a3-use_new_header_format.diff,
derby-3907-7a3-use_new_header_format.stat
>
>
> The store should save useful length information for Clobs. This allows the length to
be found without decoding the whole data stream.
> The following thread raised the issue on what information to store, and also contains
some background information: http://www.nabble.com/Storing-length-information-for-CLOB-on-disk-tp19197535p19197535.html
> The information to store, and the exact format of it, is still to be discussed/determined.
> Currently two bytes are set aside for length information, which is inadequate.

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