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Sorted Strings Table (SSTable) is the persistent file format used by ScyllaDB and Apache Cassandra. SSTable is saved as a persistent, ordered, immutable set of files on disk.
Immutable means SSTables are never modified; they are created by a MemTable flush and are deleted by a compaction.
The location of ScyllaDB SSTables is specified in scylla.yaml data_file_directories
parameter (default location: /var/lib/scylla/data
).
SSTable 3.x is more efficient and requires less disk space than the SSTable 2.x.
SSTable Version |
ScyllaDB Enterprise Version |
ScyllaDB Open Source Version |
---|---|---|
3.x (‘me’) |
2022.2 |
5.1 and above |
3.x (‘md’) |
2021.1 |
4.3, 4.4, 4.5, 4.6, 5.0 |
3.0 (‘mc’) |
2019.1, 2020.1 |
3.x, 4.1, 4.2 |
2.2 (‘la’) |
N/A |
2.3 |
2.1.8 (‘ka’) |
2018.1 |
2.2 |
In ScyllaDB 5.1 and above, the me
format is enabled by default.
In ScyllaDB 4.3 to 5.0, the md
format is enabled by default.
In ScyllaDB 3.1 to 4.2, the mc
format is enabled by default.
In ScyllaDB 3.0, the mc
format is disabled by default. You can enable it by adding the enable_sstables_mc_format
parameter set to true
in the scylla.yaml
file. For example:
enable_sstables_mc_format: true
For more information on ScyllaDB 3.x SSTable formats, see below:
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