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< th colspan = "3" align = "center" > DbMpoolFile::set_lsn_offset()< / th >
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The DbMpoolFile Handle
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< h2 class = "title" style = "clear: both" > < a id = "mempset_lsn_offset" > < / a > DbMpoolFile::set_lsn_offset()< / h2 >
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< pre class = "programlisting" > #include < db_cxx.h>
int DbMpoolFile::set_lsn_offset(int32_t lsn_offset); < / pre >
< p >
The < code class = "methodname" > DbMpoolFile::set_lsn_offset()< / code > method specifies the zero-based
byte offset of a log sequence number
(< a class = "link" href = "lsn.html" title = "Chapter > DbLsn< / a > ) on the file's pages, for
the purposes of page-flushing as part of transaction checkpoint. (See
the < a class = "xref" href = "mempsync.html" title = "DbEnv::memp_sync()" > DbEnv::memp_sync()< / a >
documentation for more information.)
< / p >
< p >
The < code class = "methodname" > DbMpoolFile::set_lsn_offset()< / code > method configures a file in the
cache, not only operations performed using the specified
< a class = "link" href = "memp.html" title = "Chapter > DbMpoolFile< / a > handle.
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The < code class = "methodname" > DbMpoolFile::set_lsn_offset()< / code > method may not be called after the
< a class = "xref" href = "mempfopen.html" title = "DbMpoolFile::open()" > DbMpoolFile::open()< / a >
method is called. If the file is already open in the cache when
< a class = "xref" href = "mempfopen.html" title = "DbMpoolFile::open()" > DbMpoolFile::open()< / a > is
called, the information specified to < code class = "methodname" > DbMpoolFile::set_lsn_offset()< / code >
must be consistent with the existing file or an error will be returned.
< / p >
< p >
The < code class = "methodname" > DbMpoolFile::set_lsn_offset()< / code > < span >
< span >
method either returns a non-zero error value or throws an
exception that encapsulates a non-zero error value on
failure, and returns 0 on success.
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< h4 class = "title" > < a id = "id3631618" > < / a > lsn_offset< / h4 >
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The < span class = "bold" > < strong > lsn_offset< / strong > < / span > parameter is the
zero-based byte offset of the log sequence number on the file's pages.
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< h3 class = "title" > < a id = "id3631662" > < / a > See Also< / h3 >
2011-09-13 17:44:24 +00:00
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< a class = "xref" href = "memp.html#memplist" title = "Memory Pools and Related Methods" > Memory Pools and Related Methods< / a >
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