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<!--$Id: bulk.so,v 1.4 2006/07/14 23:04:42 alanb Exp $--> <!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB Reference Guide: Bulk transfer</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <table width="100%"><tr valign=top> <td><b><dl><dt>Berkeley DB Reference Guide:<dd>Berkeley DB Replication</dl></b></td> <td align=right><a href="../rep/init.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../rep/trans.html"><img src="../../images/next.gif" alt="Next"></a> </td></tr></table> <p align=center><b>Bulk transfer</b></p> <p>Sites in a replication group may be configured to use bulk transfer by calling the <a href="../../api_c/rep_config.html">DB_ENV->rep_set_config</a> method with the <a href="../../api_c/rep_config.html#DB_REP_CONF_BULK">DB_REP_CONF_BULK</a> flag. When configured for bulk transfer, sites will accumulate records in a buffer and transfer them to another site in a single network transfer. Configuring bulk transfer makes sense for master sites, of course. Additionally, applications using client-to-client synchronization may find it helpful to configure bulk transfer for client sites as well.</p> <p>When a master is generating new log records, or any information request is made of a master, and bulk transfer has been configured, records will accumulate in a bulk buffer. The bulk buffer will be sent to the client if either the buffer is full or if a permanent record (for example, a transaction commit or checkpoint record) is queued for the client.</p> <p>When a client is responding to another client's request for information, and bulk transfer has been configured, records will accumulate in a bulk buffer. The bulk buffer will be sent to the client when the buffer is full or when the client's request has been satisfied; no particular type of record will cause the buffer to be sent.</p> <p>The size of the bulk buffer itself is internally determined and cannot be configured. However, the overall size of a transfer may be limited using the <a href="../../api_c/rep_limit.html">DB_ENV->rep_set_limit</a> method.</p> <table width="100%"><tr><td><br></td><td align=right><a href="../rep/init.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../rep/trans.html"><img src="../../images/next.gif" alt="Next"></a> </td></tr></table> <p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font> </body> </html>
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