Durability

What is the durability guaranteed by SingleStore Helios?

SingleStore Helios provides several options to control the trade-offs between performance and durability. In its most durable state, SingleStore Helios will not lose any transactions that have been acknowledged.

Transaction writes are replicated on two nodes before commit, to ensure updates are never lost in case of single-node failure thereby ensuring durability.

See CREATE DATABASE for more information.

Can I configure SingleStore Helios to be fully durable?

Yes, you can configure the durability through the WITH {SYNC | ASYNC} DURABILITY option in the CREATE DATABASE and RESTORE DATABASE commands.

What isolation levels does SingleStore Helios provide?

SingleStore Helios provides the READ COMMITTED isolation level. This guarantees that no transaction will read any uncommitted data from another transaction. Furthermore, once a change is observed in one transaction, it will be visible to all transactions.

Unlike the REPEATABLE READ isolation level, READ COMMITTED isolation level does not guarantee that a row will remain the same for every read query in a given transaction. Applications that use SingleStore Helios should take this into account.