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https://issues.apache.org/jira/browse/DERBY-684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12649074#action_12649074
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Dag H. Wanvik commented on DERBY-684:
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+1 to close, linked it to DERBY-1256.
> 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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