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Berkeley DB: DbMpoolFile::set_clear_len
DbMpoolFile::set_clear_len
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#include <db_cxx.h>
int
DbMpoolFile::set(u_int32_t len);
int
DbMpoolFile::get_clear_len(u_int32_t *lenp);
Description: DbMpoolFile::set_clear_len
The DbMpoolFile::set_clear_len method sets the number of initial bytes in a
page that should be set to nul when the page is created as a result of
the DB_MPOOL_CREATE or DB_MPOOL_NEW flags being
specified to DbMpoolFile::get. If no value is specified, or len
is 0, the entire page is cleared.
The DbMpoolFile::set_clear_len method configures a file in the memory pool, not only
operations performed using the specified DbMpoolFile handle.
The DbMpoolFile::set_clear_len method may not be called after the DbMpoolFile::open method is
called.
If the file is already open in the memory pool when
DbMpoolFile::open is called, the information specified to DbMpoolFile::set_clear_len
must be consistent with the existing file or an error will be
returned.
The DbMpoolFile::set_clear_len 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.
Parameters
- len
- The len parameter is the number of initial bytes in a page that
should be set to nul when the page is created. A value of 0 results in
the entire page being set to nul bytes.
Description: DbMpoolFile::get_clear_len
The DbMpoolFile::get_clear_len method returns the .
The DbMpoolFile::get_clear_len method may be called at any time during the life of the
application.
Class
DbEnv, DbMpoolFile
See Also
Memory Pools and Related Methods
Copyright (c) 1996-2004 Sleepycat Software, Inc. - All rights reserved.
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