DB->set_pagesize API Ref

#include <db.h>

int DB->set_pagesize(DB *db, u_int32_t pagesize);

int DB->get_pagesize(DB *db, u_int32_t *pagesizep);


Description: DB->set_pagesize

Set the size of the pages used to hold items in the database, in bytes. The minimum page size is 512 bytes, the maximum page size is 64K bytes, and the page size must be a power-of-two. If the page size is not explicitly set, one is selected based on the underlying filesystem I/O block size. The automatically selected size has a lower limit of 512 bytes and an upper limit of 16K bytes.

For information on tuning the Berkeley DB page size, see Selecting a page size.

The DB->set_pagesize method configures a database, not only operations performed using the specified DB handle.

The DB->set_pagesize 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_pagesize will be ignored.

If creating additional databases in a single physical file, information specified to DB->set_pagesize will be ignored and the page size of the existing databases will be used.

The DB->set_pagesize method returns a non-zero error value on failure and 0 on success.

Parameters
pagesize

Errors

The DB->set_pagesize method may fail and return one of the following non-zero errors:


EINVAL

Description: DB->get_pagesize

The DB->get_pagesize method returns the page size.

The DB->get_pagesize method may be called at any time during the life of the application.

The DB->get_pagesize method returns a non-zero error value on failure and 0 on success.

Parameters
pagesizep


Class DB
See Also Databases and Related Methods

APIRef

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