DB_File

• The best choice

• Berkeley DB was good ten years ago and it has gotten better

• Basic usage is very simple:

 use DB_File;
 tie %hash, 'DB_File', $file or die ...;

• Optional arguments:

 tie %hash, 'DB_File', $file, O_RDONLY;

 tie %hash, 'DB_File', $file, O_CREAT | O_RDWR;

 tie %hash, 'DB_File', $file, O_CREAT | O_RDWR, 0666;

• Now use %hash just like any other hash