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Posted to derby-dev@db.apache.org by "Kathey Marsden (JIRA)" <ji...@apache.org> on 2008/04/24 19:09:55 UTC
[jira] Updated: (DERBY-684) Improve performance of Clob objects
(ClobOutputStream#write,ClobWriter#write) on the client
[ https://issues.apache.org/jira/browse/DERBY-684?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kathey Marsden updated DERBY-684:
---------------------------------
Component/s: Newcomer
> Improve performance of Clob objects (ClobOutputStream#write,ClobWriter#write) on the client
> -------------------------------------------------------------------------------------------
>
> Key: DERBY-684
> URL: https://issues.apache.org/jira/browse/DERBY-684
> Project: Derby
> Issue Type: Improvement
> Components: Network Client, Newcomer, Performance
> Affects Versions: 10.1.1.0, 10.1.2.1, 10.2.1.6
> Environment: all
> Reporter: Sunitha Kambhampati
>
> Dan suggested this improvement here:
> http://issues.apache.org/jira/browse/DERBY-463?page=comments#action_12356742
> For org.apache.derby.client.am.ClobOutputStream#write(int), five objects are created for every byte written.
> "In fact this class and the client Clob have code like this everywhere, as the Clob is updated:
> clob_.string_ = clob_.string_.concat(new String(newByte));
> clob_.asciiStream_ = new java.io.StringBufferInputStream(clob_.string_);
> clob_.unicodeStream_ = new java.io.StringBufferInputStream(clob_.string_);
> clob_.characterStream_ = new java.io.StringReader(clob_.string_);
> Would probably be better to create most of those objects on demand, rather than on every modification. I mean if the CLOB is modified
> but the application never retrieives the ascii or character streams, what was the benefit of creating them? "
> ________________
> Also check the org.apache.derby.client.am.ClobWriter. Need to make this better and efficient.
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