Inconsistent behavior in serializable snapshot
От | Kuntal Ghosh |
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Тема | Inconsistent behavior in serializable snapshot |
Дата | |
Msg-id | CAGz5QCK3MVNjS+EUPRVP_XvJdh79Mu-EsDn2LBHNzGMUdjtjHw@mail.gmail.com обсуждение исходный текст |
Ответы |
Re: Inconsistent behavior in serializable snapshot
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Список | pgsql-hackers |
Hello hackers, While working on serializable transaction isolation, I've noticed some strange behavior in the first permutation mentioned in isolation/specs/read-only-anomaly-2.spec file. setup { CREATE TABLE bank_account (id TEXT PRIMARY KEY, balance DECIMAL NOT NULL); INSERT INTO bank_account (id, balance) VALUES ('X', 0), ('Y', 0); } # without s3, s1 and s2 commit permutation "s2rx" "s2ry" "s1ry" "s1wy" "s1c" "s2wx" "s2c" "s3c" Here, we can see a serial order T1 <- T2 without any conflict. However, if I perform "VACUUM FREEZE bank_account" after the setup step, s2wx throws a conflict error: ERROR: could not serialize access due to read/write dependencies among transactions DETAIL: Reason code: Canceled on identification as a pivot, during write. HINT: The transaction might succeed if retried. Is this an expected behavior? -- Thanks & Regards, Kuntal Ghosh EnterpriseDB: http://www.enterprisedb.com
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