RECENT POSTS

Cdb

May 26, 2018

Fast lookup database library & utilities

cdb is a fast, reliable, lightweight package for creating and reading constant databases. Its database structure provides several features

  • Fast lookups A successful lookup in a large database normally takes just two disk accesses. An unsuccessful lookup takes only one.
  • Low overhead A database uses 2048 bytes, plus 24 bytes per record, plus the space for keys and data.
  • No random limits cdb can handle any database up to 4 gigabytes. There are no other restrictions; records don’t even have to fit into memory. Databases are stored in a machine-independent format.
  • Fast atomic database replacement cdbmake can rewrite an entire database two orders of magnitude faster than other hashing packages.
  • Fast database dumps cdbdump prints the contents of a database in cdbmake-compatible format.

cdb is designed to be used in mission-critical applications like e-mail. Database replacement is safe against system crashes. Readers don’t have to pause during a rewrite.

Note for developers packages that need to read cdb files should incorporate the necessary portions of the cdb library rather than relying on an external cdb library. See WWW

WWW http//cr.yp.to/cdb.html