Berkeley DB: Db::set_q_extentsize
Description: Berkeley DB: An embedded database programmatic toolkit.
Keywords: embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++

Db::set_q_extentsize |

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    #include <db_cxx.h>

    int
    Db::set_q_extentsize(u_int32_t extentsize);

    int
    Db::get_q_extentsize(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 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
extentsize

- The extentsize parameter is the number of pages in a Queue database extent.

Errors

The Db::set_q_extentsize method may fail and throw DbException, encapsulating one of the following non-zero errors, or 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 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
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`

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