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varlen.rst 1.29 KiB

Variable length series

Version 0.5 added support for variable length series.

How does it work?

They work by breaking down your data into smaller pieces and storing them in separate series, prefixing with length.

For each series you specify so-called length profile. It is a list of ints, each representing a block size for next series created. If an entry cannot fit in the already created series, a new one will be created. Note that the last entry of this array will loop forever, so if you for example put a 1024 byte data in a varlen series of length profile [10, 255] there will be a total of 5 normal time series created to accomodate it, with length of: * 10 * 255 * 255 * 255 * 255

Each entry is also prefixed by it's length. The size of that field is described by an extra parameter called size_struct.

Note that the only valid sizes of size_struct are: * 1 for maximum length of 255 * 2 for maximum length of 65535 * 4 for maximum length of 4294967295

Accessing them

Use methods :meth:`tempsdb.database.Database.create_varlen_series` and :meth:`tempsdb.database.Database.get_varlen_series` to obtain instances of following class: