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<p>In previous releases, the <a href="../api_reference/C/envset_flags.html" class="olink">DB_ENV->set_flags()</a> method flag
DB_TXN_NOT_DURABLE specified that transactions for the entire database
environment were not durable. However, it was not possible to set this
flag in environments that were part of replication groups, and physical
log files were still created. The 4.3 release adds support for true
in-memory logging for both replication and non-replicated sites.</p>
<p>Existing applications setting the DB_TXN_NOT_DURABLE flag for database
environments should be upgraded to set the DB_LOG_INMEMORY flag instead.</p>
<p>In previous releases, log buffer sizes were restricted to be less than
or equal to the log file size; this restriction is no longer required.</p>
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