Berkeley DB Reference Guide:
Programmer Notes

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Run-time configuration

There are a few interfaces that support run-time configuration of Berkeley DB. First is a group of interfaces that allow applications to intercept Berkeley DB requests for underlying library or system call functionality:

DBENV->set_func_close
DBENV->set_func_dirfree
DBENV->set_func_dirlist
DBENV->set_func_exists
DBENV->set_func_free
DBENV->set_func_fsync
DBENV->set_func_ioinfo
DBENV->set_func_malloc
DBENV->set_func_map
DBENV->set_func_open
DBENV->set_func_read
DBENV->set_func_realloc
DBENV->set_func_seek
DBENV->set_func_sleep
DBENV->set_func_unlink
DBENV->set_func_unmap
DBENV->set_func_write
DBENV->set_func_yield
These interfaces are only available from the Berkeley DB C language API.

In addition, there are a few interfaces that allow applications to re-configure, on an application-wide or environment wide basis, Berkeley DB behaviors.

DBENV->set_mutexlocks
DBENV->set_pageyield
DBENV->set_region_init
DBENV->set_tas_spins
These interfaces are only available from the Berkeley DB C and C++ language APIs.

A not-uncommon problem for applications is the new API in Solaris 2.6 for manipulating large files. As this API was not part of Solaris 2.5, it is difficult to create a single binary that takes advantage of the large file functionality in Solaris 2.6 but which still runs on Solaris 2.5. Example code that supports this is included.],

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