In TDengine database, there is a data compression configuration in /etc/taos/taos.cfg
# enable/disable compression
# comp 2
the default option is 2, so how many options do we have for comp, what is the difference for each option?
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TDengine provides three compression options: no compression, one-stage compression and two-stage compression, corresponding to comp values of 0, 1 and 2 respectively.
One-stage compression is carried out according to the type of data. Compression algorithms include delta-delta coding, simple 8B method, zig-zag coding, LZ4 and other algorithms.
Two-stage compression is based on one-stage compression and compressed by general compression algorithm, which has higher compression ratio.
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