Adding upstream version 14.5.upstream/14.5upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 42 insertions, 0 deletions

diff --git a/src/test/isolation/specs/read-only-anomaly-2.spec b/src/test/isolation/specs/read-only-anomaly-2.spec
new file mode 100644
index 0000000..6b579a6
--- /dev/null
+++ b/src/test/isolation/specs/read-only-anomaly-2.spec
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+# The example from the paper "A read-only transaction anomaly under snapshot
+# isolation"[1].
+#
+# Here we test that serializable snapshot isolation (SERIALIZABLE) doesn't
+# suffer from the anomaly, because s2 is aborted upon detection of a cycle.
+#
+# [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; }
+step s3r	{ SELECT id, balance FROM bank_account WHERE id IN ('X', 'Y') ORDER BY id; }
+step s3c	{ COMMIT; }
+
+# without s3, s1 and s2 commit
+permutation s2rx s2ry s1ry s1wy s1c s2wx s2c s3c
+
+# once s3 observes the data committed by s1, a cycle is created and s2 aborts
+permutation s2rx s2ry s1ry s1wy s1c s3r s3c s2wx