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Derk van Veen: Explaining the PG concurrency control mechanisms using rollercoasters (PGConf.EU 23)
Explaining the PG concurrency control mechanisms using rollercoasters, Derk van Veen delves into transactions, isolation levels, and locking, shedding light on the Inner workings of PostgreSQL concurrency control.
- Transactions provide isolation to prevent concurrency issues
- Read committed isolation level prevents transactions from reading committed information that was updated by other transactions
- Repeatable reads allows transactions to read the snapshot of the database at the time they started
- Serializable isolation level prevents transactions from reading committed information that was updated by other transactions
- Locking is used to prevent concurrent updates and ensure serializability
- The isolation level determines when a transaction can see changes made by other transactions
- The concept of transaction snapshot is important for understanding how multiple transactions work together
- The database stores information about transactions using Xmin and Xmax variables
- The database uses 32-bit integer numbers to store transaction IDs
- The isolation level affects the timestamp that a transaction is using
- Serializable read isolation level ensures that transactions read the snapshot of the database at the time they started, and not the latest committed information
- Transactions can be committed or aborted, and the state of the database reflects this
- The future holds promises of new isolation levels and features in the database