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Berkeley DB: DbMpoolFile::set_flags
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DbMpoolFile::set_flags
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#include <db_cxx.h>
int
DbMpoolFile::set_flags(u_int32_t flags, bool onoff);
int
DbMpoolFile::get_flags(u_int32_t *flagsp);
Description: DbMpoolFile::set_flags
Configure a file in the cache.
To set the flags for a particular database, call the
DbMpoolFile::set_flags method using the DbMpoolFile handle stored in
the mpf field of the Db handle.
The DbMpoolFile::set_flags 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
flags- The flags parameter must be set by bitwise inclusively OR'ing together one or more
of the following values:
DB_MPOOL_NOFILE- If set, no backing temporary file will be opened for the specified
in-memory database, even if it expands to fill the entire cache.
Attempts to create new database pages after the cache has been filled
will fail.
The DB_MPOOL_NOFILE flag configures a file in the memory pool, not only
operations performed using the specified DbMpoolFile handle.
The DB_MPOOL_NOFILE flag may be used to configure Berkeley DB at any time during
the life of the application.
DB_MPOOL_UNLINK- If set, remove the file when the last reference to it is closed.
The DB_MPOOL_NOFILE flag configures a file in the memory pool, not only
operations performed using the specified DbMpoolFile handle.
The DB_MPOOL_UNLINK flag may be used to configure Berkeley DB at any time during
the life of the application.
onoff- If onoff is
false,
the specified flags are cleared; otherwise they are set.
Description: DbMpoolFile::get_flags
The DbMpoolFile::get_flags method returns the flags.
The DbMpoolFile::get_flags method may be called at any time during the life of the
application.
The DbMpoolFile::get_flags 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
flagsp- The DbMpoolFile::get_flags method returns the
flags in flagsp.
Class
DbEnv, DbMpoolFile
See Also
Memory Pools and Related Methods
Copyright (c) 1996,2008 Oracle. All rights reserved.