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-rw-r--r-- | src/test/isolation/specs/read-only-anomaly-3.spec | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/test/isolation/specs/read-only-anomaly-3.spec b/src/test/isolation/specs/read-only-anomaly-3.spec new file mode 100644 index 0000000..61d9c0b --- /dev/null +++ b/src/test/isolation/specs/read-only-anomaly-3.spec @@ -0,0 +1,39 @@ +# The example from the paper "A read-only transaction anomaly under snapshot +# isolation"[1]. +# +# Here we test that serializable snapshot isolation can avoid the anomaly +# without aborting any transactions, by instead causing s3 to be deferred +# until a safe snapshot can be taken. +# +# [1] http://www.cs.umb.edu/~poneil/ROAnom.pdf + +setup +{ + CREATE TABLE bank_account (id TEXT PRIMARY KEY, balance DECIMAL NOT NULL); + INSERT INTO bank_account (id, balance) VALUES ('X', 0), ('Y', 0); +} + +teardown +{ + DROP TABLE bank_account; +} + +session s1 +setup { BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE; } +step s1ry { SELECT balance FROM bank_account WHERE id = 'Y'; } +step s1wy { UPDATE bank_account SET balance = 20 WHERE id = 'Y'; } +step s1c { COMMIT; } + +session s2 +setup { BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE; } +step s2rx { SELECT balance FROM bank_account WHERE id = 'X'; } +step s2ry { SELECT balance FROM bank_account WHERE id = 'Y'; } +step s2wx { UPDATE bank_account SET balance = -11 WHERE id = 'X'; } +step s2c { COMMIT; } + +session s3 +setup { BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE READ ONLY DEFERRABLE; } +step s3r { SELECT id, balance FROM bank_account WHERE id IN ('X', 'Y') ORDER BY id; } +step s3c { COMMIT; } + +permutation s2rx s2ry s1ry s1wy s1c s3r s2wx s2c s3c |