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体验新版 GitCode,发现更多精彩内容 >>
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09bcb248
编写于
2月 02, 2008
作者:
T
Tom Lane
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Minor wordsmithing in release notes' description of asynchronous commit.
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doc/src/sgml/release.sgml
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<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.57
7 2008/01/31 21:31:3
3 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.57
8 2008/02/02 23:30:2
3 tgl Exp $ -->
<!--
Typical markup:
...
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@@ -697,13 +697,14 @@ current_date < 2017-11-17
<para>
This feature dramatically increases performance for short data-modifying
transactions.
The disadvantage is that because disk writes are
delayed, if the
operating system crashes before data is written to
transactions.
The disadvantage is that because disk writes are delayed,
if the database or
operating system crashes before data is written to
the disk, committed data will be lost. This feature is useful for
applications that can accept some data loss. Unlike turning off
<varname>fsync</varname>, asynchronous commit does not put database
consistency at risk; the worst case is that after a database or system
crash the last few reportedly-committed transactions might be missing.
<varname>fsync</varname>, using asynchronous commit does not put
database consistency at risk; the worst case is that after a crash the
last few reportedly-committed transactions might not be committed after
all.
This feature is enabled by turning off <varname>synchronous_commit</>
(which can be done per-session or per-transaction, if some transactions
are critical and others are not).
...
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