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Date: Wed, 18 Mar 2009 09:48:50 -0700 (PDT)
From: "Kristian Waagan (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Resolved: (DERBY-3907) Save useful length information for
 Clobs in store
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     [ https://issues.apache.org/jira/browse/DERBY-3907?page=3Dcom.atlassia=
n.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 functional=
ity required to insert the required meta data for Clobs inserted with one o=
f 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.di=
ff, derby-3907-2b-header_write_preparation.stat, derby-3907-2c-header_write=
_preparation-PREVIEW.diff, derby-3907-2c-header_write_preparation-PREVIEW.s=
tat, derby-3907-2c-header_write_preparation.diff, derby-3907-2c-header_writ=
e_preparation.diff, derby-3907-2c-header_write_preparation.stat, derby-3907=
-3a-readertoutf8stream_cleanup.diff, derby-3907-3a-readertoutf8stream_clean=
up.diff, derby-3907-3a-readertoutf8stream_cleanup.stat, derby-3907-3b-reade=
rtoutf8stream_cleanup.diff, derby-3907-4a-add_getStreamWithDescriptor.diff,=
 derby-3907-4a-add_getStreamWithDescriptor.stat, derby-3907-5a-use_getStrea=
mWithDescriptor.diff, derby-3907-5a-use_getStreamWithDescriptor.stat, derby=
-3907-6a-SQLClob_stream_descriptor_sync.diff, derby-3907-7a-write_new_heade=
r_format-PREVIEW.diff, derby-3907-7a-write_new_header_format.diff, derby-39=
07-7a-write_new_header_format.diff, derby-3907-7a-write_new_header_format.s=
tat, derby-3907-7a1-write_new_header_format.diff, derby-3907-7a2-use_new_fr=
amework.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 th=
e length to be found without decoding the whole data stream.
> The following thread raised the issue on what information to store, and a=
lso contains some background information: http://www.nabble.com/Storing-len=
gth-information-for-CLOB-on-disk-tp19197535p19197535.html
> The information to store, and the exact format of it, is still to be disc=
ussed/determined.
> Currently two bytes are set aside for length information, which is inadeq=
uate.

--=20
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