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cdbmake - Online in the Cloud

Run cdbmake in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command cdbmake that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



cdbmake - create a constant database


cdbmake cdb cdb.tmp


cdbmake reads a series of encoded records from its standard input and writes a constant
database to cdb.

cdbmake ensures that cdb is updated atomically, so programs reading cdb never have to wait
for cdbmake to finish. It does this by first writing the database to cdb.tmp and then
moving cdb.tmp on top of cdb. If cdb.tmp already exists, it is destroyed. The
directories containing cdb.tmp and cdb must be writable to cdbmake; they must also be on
the same filesystem.

cdbmake always makes sure that cdb.tmp is safely written to disk before it replaces cdb.
If the input is in a bad format or if cdbmake has any trouble writing cdb.tmp to disk,
cdbmake complains and leaves cdb alone.

Records are indexed by keys. A key is a string. cdb is structured so that another
program, starting from a key, can quickly find the relevant record. cdbmake allows
several records with the same key, although most readers take only the first record, and
cdbmake slows down somewhat if there are many records with the same key.

cdbmake and cdbdump(1) preserve the order of records.

A record is encoded for cdbmake as +klen,dlen:key->data followed by a newline. Here klen
is the number of bytes in key and dlen is the number of bytes in data. The end of data is
indicated by an extra newline. For example:


key and data may contain any characters, including colons, dashes, newlines, and nulls.

Keys and data do not have to fit into memory. A database cannot exceed 4 gigabytes.

cdb is portable across machines.

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