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You're viewing documentation for a previous version of ScyllaDB Open Source. Switch to the latest stable version.
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 |
For more information about Scylla 2.x SSTable formats, see below:
SSTable Compression - Deep dive into Scylla/Apache Cassandra SSTable Compression
SSTable Data File - Deep dive into Scylla/Apache Cassandra SSTable format
SSTable format in Scylla - Scylla SSTables are compatible to those in Apache Cassandra 2.1.8, but why there are more of them?
SSTable Interpretation - Deep dive into Scylla/Apache Cassandra SSTable Interpretation in Scylla
SSTable Summary File - Deep dive into Scylla/Apache Cassandra SSTable Summary file format
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Apache®, Apache Cassandra®, Cassandra®, the Apache feather logo and the Apache Cassandra® Eye logo are either registered trademarks or trademarks of the Apache Software Foundation in the United States and/or other countries. No endorsement by The Apache Software Foundation is implied by the use of these marks.
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