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h2database
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4204251c
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4204251c
authored
10月 14, 2013
作者:
Thomas Mueller
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4204251c
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@@ -332,6 +332,9 @@ The plan is to add such a mechanism later when needed.
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@@ -332,6 +332,9 @@ The plan is to add such a mechanism later when needed.
<p>
<p>
Internally, changes are buffered in memory, and once enough changes have accumulated,
Internally, changes are buffered in memory, and once enough changes have accumulated,
they are written in one continuous disk write operation.
they are written in one continuous disk write operation.
Compared to traditional database storage engines,
this should improve write performance for file systems and storage systems
that do not efficiently support small random writes, such as Btrfs, as well as SSDs.
(According to a test, write throughput of a common SSD increases with write block size,
(According to a test, write throughput of a common SSD increases with write block size,
until a block size of 2 MB, and then does not further increase.)
until a block size of 2 MB, and then does not further increase.)
By default, committed changes are automatically written once every second
By default, committed changes are automatically written once every second
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