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    <p>Try putting this into your DB_CONFIG:</p> <pre><code>set_flags DB_TXN_WRITE_NOSYNC set_flags DB_TXN_NOSYNC </code></pre> <p>From my experience, these increase write performance a lot.</p> <hr> <blockquote> <p><code>DB_TXN_NOSYNC</code> If set, Berkeley DB will not write or synchronously flush the log on transaction commit or prepare. This means that transactions exhibit the ACI (atomicity, consistency, and isolation) properties, but not D (durability); that is, database integrity will be maintained, but if the application or system fails, it is possible some number of the most recently committed transactions may be undone during recovery. The number of transactions at risk is governed by how many log updates can fit into the log buffer, how often the operating system flushes dirty buffers to disk, and how often the log is checkpointed Calling DB_ENV->set_flags with the DB_TXN_NOSYNC flag only affects the specified DB_ENV handle (and any other Berkeley DB handles opened within the scope of that handle). For consistent behavior across the environment, all DB_ENV handles opened in the environment must either set the DB_TXN_NOSYNC flag or the flag should be specified in the DB_CONFIG configuration file.</p> <p>The DB_TXN_NOSYNC flag may be used to configure Berkeley DB at any time during the life of the application.</p> </blockquote> <hr> <blockquote> <p><code>DB_TXN_WRITE_NOSYNC</code> If set, Berkeley DB will write, but will not synchronously flush, the log on transaction commit or prepare. This means that transactions exhibit the ACI (atomicity, consistency, and isolation) properties, but not D (durability); that is, database integrity will be maintained, but if the system fails, it is possible some number of the most recently committed transactions may be undone during recovery. The number of transactions at risk is governed by how often the system flushes dirty buffers to disk and how often the log is checkpointed. Calling DB_ENV->set_flags with the DB_TXN_WRITE_NOSYNC flag only affects the specified DB_ENV handle (and any other Berkeley DB handles opened within the scope of that handle). For consistent behavior across the environment, all DB_ENV handles opened in the environment must either set the DB_TXN_WRITE_NOSYNC flag or the flag should be specified in the DB_CONFIG configuration file.</p> <p>The DB_TXN_WRITE_NOSYNC flag may be used to configure Berkeley DB at any time during the life of the application.</p> </blockquote> <p>See <a href="http://www.mathematik.uni-ulm.de/help/BerkeleyDB/api_c/env_set_flags.html" rel="noreferrer">http://www.mathematik.uni-ulm.de/help/BerkeleyDB/api_c/env_set_flags.html</a> for more details.</p>
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    1. COThanks for the comment. However, I have found out that simply enabling the environment produces too much of a performance degradation compared to not using one. I think it has to do with the WAL so these flags would help me, but even without an environment everything is too slow.
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    2. CO@jjfine: I believe that environment is used implicitly with anonymous (auto-commit) transactions if you don't do that explicitly. So not using environment won't help.
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    3. CO@VladLazarenko, so if I set one of these 2 flags, when I close the berkeley db, will the cache be flushed back to disk?
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