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Berkeley DB: DB->set_q_extentsize
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DB->set_q_extentsize
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#include <db.h>
int
DB->set_q_extentsize(DB *db, u_int32_t extentsize);
int
DB->get_q_extentsize(DB *db, u_int32_t *extentsizep);
Description: DB->set_q_extentsize
Set the size of the extents used to hold pages in a Queue database,
specified as a number of pages. Each extent is created as a separate
physical file. If no extent size is set, the default behavior is to
create only a single underlying database file.
For information on tuning the extent size, see
Selecting a extent size.
The DB->set_q_extentsize method configures a database, not only operations performed
using the specified DB handle.
The DB->set_q_extentsize method may not be called after the DB->open method is called.
If the database already exists when
DB->open is called, the information specified to DB->set_q_extentsize will
be ignored.
The DB->set_q_extentsize method
returns a non-zero error value on failure
and 0 on success.
Parameters
extentsize- The extentsize parameter is the number of pages in a Queue database
extent.
Errors
The DB->set_q_extentsize method
may fail and return one of the following non-zero errors:
EINVAL- If the method was called after DB->open was called; or if an
invalid flag value or parameter was specified.
Description: DB->get_q_extentsize
The DB->get_q_extentsize method returns the number of pages in an extent.
The DB->get_q_extentsize method may be called at any time during the life of the
application.
The DB->get_q_extentsize method
returns a non-zero error value on failure
and 0 on success.
Parameters
extentsizep- The DB->get_q_extentsize method returns the
number of pages in an extent in extentsizep.
Class
DB
See Also
Databases and Related Methods
Copyright (c) 1996,2008 Oracle. All rights reserved.