June 2001
Intermediate to advanced
688 pages
19h 18m
English
Content preview from Berkeley DB
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Opening a Database
The DB→open function, the standard interface for opening a database, takes the following arguments:
file The name of the file to be opened.
database An optional database name.
type The type of database to open. This value will be one of the four access methods Berkeley DB supports: DB_BTREE, DB_HASH, DB_QUEUE, or DB_RECNO; or the special value DB_UNKNOWN, which allows you to open an existing file without knowing its type.
mode The permissions to give to any created file.
There are a few flags that you can set to customize open:
DB_CREATE Create the underlying database and any necessary physical files.
DB_NOMMAP Do not map this database into process memory.
DB_RDONLY Treat the data base as read-only.
DB_THREAD The returned ...