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The SST files store the key-value pairs for tables and indexes. Sharding is the right term here because each tablet is a database (based on RocksDB), with its own protection. This looks like the sharded databases we described above, except that they are not SQL databases but key-value document stores. They have all the required features for a reliable datastore, with transactions and strong consistency. However, they don’t have the burden of managing them as multiple databases because the SQL layer is above. Joins and secondary indexes are not processed at this level because this prevents cross-shard transactions.
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