Column compression

Column compression, introduced in Tarantool Enterprise Edition 3.7.0, aims to save memory space. It compresses a range of consecutive values and stores them in a compressed block. Default block size is 50-100 values.

The following compression algorithms are supported:

• lz4
• zstd
• zlib

A column of any type can be compressed, however the "external" values (the strings that are longer than 12 characters) are not yet compressed.

Compression settings:

• acceleration – LZ4-specific configuration parameter:
  • allowed range: 1...65537
  • recommended: 10...1000
  • higher values improve compression and decompression speed, but reduce the compression ratio

Example:

 
local format = {    {'c1', 'uint64'},    {'c2', 'string', is_nullable = true, compression = 'lz4'},    {'c3', 'int32', compression = {type = 'lz4', acceleration = 1000}},}box.schema.create_space('test', {    engine = 'memcs', field_count = #format, format = format,})