Library Version 18.1.40

Db::set_q_extentsize()
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## Db::set_q_extentsize()

    #include <db_cxx.h>

    int
    Db::set_q_extentsize(u_int32_t 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 a DbException exception, 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.

### Class

Db

### See Also

Database and Related Methods

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