19 lines
1000 B
Plaintext
19 lines
1000 B
Plaintext
cdb is a fast, reliable, simple 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.
|