What is repeatable read?

Asked by: Biotza Landabat

asked in category: General Last Updated: 23rd May, 2020

What is repeatable read?

Repeatable read is a higher isolation level, that in addition to the guarantees of the read committed level, it also guarantees that any data read cannot change, if the transaction reads the same data again, it will find the previously read data in place, unchanged, and available to read.

Herein, what is a phantom read?

A phantom read occurs when, in the course of a transaction, new rows are added or removed by another transaction to the records being read. The phantom reads anomaly is a special case of Non-repeatable reads when Transaction 1 repeats a ranged SELECT

Secondly, what is dirty read and phantom read? Phantom Reads: Occurs when, during a transaction, new rows are added (or deleted) by another transaction to the records being read. Dirty Reads: Data is modified in current transaction by another transaction.

Correspondingly, what is repeatable read in MySQL?

Understanding MySQL Isolation levels: repeatableread. MySQL uses Repeatableread as the default level. In the standard, this level forbids dirty reads (non committed data) and non repeatable reads (executing the same query twice should return the same values) and allows phantom reads (new rows are visible).

What are the four transaction isolation levels?

Transaction Isolation Levels. four transaction isolation levels in SQL Server 7.0: Uncommitted Read (also called “dirty read”), Committed Read, Repeatable Read, and Serializable.

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