# DB->set_q_extentsize

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    #include <db.h>

    int
    DB->set_q_extentsize(DB *db, u_int32_t extentsize);

# Description

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 interface may not be called after the DB->open interface 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.

# Errors

The DB->set_q_extentsize method may fail and return a non-zero error for the following conditions:

EINVAL
  An invalid flag value or parameter was specified.

  Called after DB->open was called.

The DB->set_q_extentsize method may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions. If a catastrophic error has occurred, the DB->set_q_extentsize method may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.

# Class

DB

# See Also

Databases and Related Methods`

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