2023年2月15日 · Non-Repeatable Read - is where within same transaction running the same query twice returns 2 different values for the same record, cause another transaction has …

2022年11月25日 · Yes, phantom reads can occur in a single statement at READ COMMITTED. The easy way to trigger it is with table joins. We had a question here in October where a join in …

2019年3月13日 · Definition of phantom reads from the Korth's book: "A transaction re-executes a query returning a set of rows that satisfy a search condition and finds that the set of rows …

2013年5月15日 · Phantom reads (be sure to not confuse this with non-repeatable reads) are possible in "Repeatable read" isolation level... in principle. But Postgresql de-facto behaviour …

2020年11月10日 · Such phenomena include dirty reads (read something that has been modified but later might be rolled back), phantom (read some data, read it again and a new row occurs …

2018年5月1日 · Does Read Committed Snapshot Isolation prevent phantom row issue? Does Snapshot Isolation prevent phantom row issue? I am seeing different results in researching …

2022年8月14日 · I'm studying distributed systems/DBs and I'm struggling understanding isolation levels when we talk about distributed systems. Avoiding problems like dirty read, non …

2023年7月5日 · READ COMMITTED is the standard level of isolation when OPTIMISTIC LOCKING is done. This ensure stable reads until the transaction (not the SQL command) is …

2018年5月16日 · As you can see the Changed value for session 2 is 0, because it read uncommitted values from session 1. When you commit both sessions now, no matter which …

In particular, STATEMENT-based replication requires no phantom reads, that is why READ COMMITTED is the default level, and has even a stricted behaviour than READ COMMITTED …