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DROP TABLE IF EXISTS t1;
CREATE TABLE T1 (a INT PRIMARY KEY AUTO_INCREMENT) ENGINE=ROCKSDB;
INSERT INTO T1 VALUES();
"con1: Creating explict snapshot"
SELECT * FROM T1;
a
1
"con2: Inserting a row"
INSERT INTO T1 VALUES();
SELECT * FROM T1;
a
1
2
"con2: Attaching snapshot id 1"
ATTACH EXPLICIT ROCKSDB SNAPSHOT 1;
"con2: New row should not be visible"
SELECT * FROM T1;
a
1
"con2: Releasing snapshot"
RELEASE EXPLICIT ROCKSDB SNAPSHOT;
"con2: New row should be visible"
SELECT * FROM T1;
a
1
2
"con1: New row should not be visible"
SELECT * FROM T1;
a
1
"con1: Releasing snapshot"
RELEASE EXPLICIT ROCKSDB SNAPSHOT;
"con1: New row should be visible"
SELECT * FROM T1;
a
1
2
"con1: Starting shared snapshot"
SELECT * FROM T1;
a
1
2
"con2: Inserting a row"
INSERT INTO T1 VALUES();
SELECT * FROM T1;
a
1
2
3
"con2: Starting existing snapshot"
START TRANSACTION WITH EXISTING ROCKSDB SNAPSHOT 2;
"con2: New row should not be visible"
SELECT * FROM T1;
a
1
2
COMMIT;
"con2: New row should be visible"
SELECT * FROM T1;
a
1
2
3
COMMIT;
"con1: New row should be visible"
SELECT * FROM T1;
a
1
2
3
"con1: Creating explict snapshot"
"con2: Trying to insert row"
INSERT INTO T1 VALUES();
ERROR HY000: Can't execute updates when an explicit snapshot is associated with the connection using CREATE|ATTACH EXPLICIT [ENGINE] SNAPSHOT
"con2: Attaching existing snapshot"
ATTACH EXPLICIT ROCKSDB SNAPSHOT 3;
"con2: Trying to insert row"
INSERT INTO T1 VALUES();
ERROR HY000: Can't execute updates when an explicit snapshot is associated with the connection using CREATE|ATTACH EXPLICIT [ENGINE] SNAPSHOT
RELEASE EXPLICIT ROCKSDB SNAPSHOT;
RELEASE EXPLICIT ROCKSDB SNAPSHOT;
"con1: Starting shared snapshot"
"con1: Trying to insert row"
INSERT INTO T1 VALUES();
ERROR HY000: Can't execute updates when you started a transaction with START TRANSACTION WITH CONSISTENT|SHARED|EXISTING [ROCKSDB] SNAPSHOT.
"con2: Starting existing snapshot"
START TRANSACTION WITH EXISTING ROCKSDB SNAPSHOT 4;
"con2: Trying to insert row"
INSERT INTO T1 VALUES();
ERROR HY000: Can't execute updates when you started a transaction with START TRANSACTION WITH CONSISTENT|SHARED|EXISTING [ROCKSDB] SNAPSHOT.
COMMIT;
COMMIT;
"con1: Creating explicit snapshot"
CREATE EXPLICIT ROCKSDB SNAPSHOT;
SELECT * FROM T1;
a
1
2
3
"con2: Inserting a row"
INSERT INTO T1 VALUES();
SELECT * FROM T1;
a
1
2
3
4
"con1: New row should not be seen"
SELECT * FROM T1;
a
1
2
3
"con1: Creating another explicit snapshot"
CREATE EXPLICIT ROCKSDB SNAPSHOT;
"con1: Now the new row should be seen"
SELECT * FROM T1;
a
1
2
3
4
"con1: Starting transaction with consistent snapshot"
START TRANSACTION WITH CONSISTENT ROCKSDB SNAPSHOT;
SELECT * FROM T1;
a
1
2
3
4
"con2: Inserting a row"
INSERT INTO T1 VALUES();
SELECT * FROM T1;
a
1
2
3
4
5
"con1: The new row should not be seen"
SELECT * FROM T1;
a
1
2
3
4
"con1: Creating another explicit snapshot"
CREATE EXPLICIT ROCKSDB SNAPSHOT;
"con1: The new row should still not be seen"
SELECT * FROM T1;
a
1
2
3
4
"con1: Committing trx"
COMMIT;
"con1: The new row should now be seen because of the new explicit snapshot created above"
SELECT * FROM T1;
a
1
2
3
4
5
"con1: Releasing explicit snapshot"
RELEASE EXPLICIT ROCKSDB SNAPSHOT;
"con1: Starting transaction with shared snapshot"
START TRANSACTION WITH SHARED ROCKSDB SNAPSHOT;
SELECT * FROM T1;
a
1
2
3
4
5
"con2: Inserting a row"
INSERT INTO T1 VALUES();
SELECT * FROM T1;
a
1
2
3
4
5
6
"con1: The new row should not be seen"
SELECT * FROM T1;
a
1
2
3
4
5
"con1: Starting another transaction with shared snapshot"
START TRANSACTION WITH SHARED ROCKSDB SNAPSHOT;
"con1: The new row should now be seen"
SELECT * FROM T1;
a
1
2
3
4
5
6
COMMIT;
"con1: Creating explicit snapshot"
CREATE EXPLICIT ROCKSDB SNAPSHOT;
SELECT * FROM T1;
a
1
2
3
4
5
6
"con1: Releasing explicit snapshot"
RELEASE EXPLICIT ROCKSDB SNAPSHOT;
"con1: Releasing explicit snapshot again"
RELEASE EXPLICIT ROCKSDB SNAPSHOT;
ERROR HY000: Cannot process explicit snapshot
"con1: Starting transaction with shared snapshot"
START TRANSACTION WITH SHARED ROCKSDB SNAPSHOT;
SELECT * FROM T1;
a
1
2
3
4
5
6
"con2: Inserting a row"
INSERT INTO T1 VALUES();
SELECT * FROM T1;
a
1
2
3
4
5
6
7
"con1: Creating explicit snapshot"
CREATE EXPLICIT ROCKSDB SNAPSHOT;
SELECT * FROM T1;
a
1
2
3
4
5
6
"con1: Releasing explicit snapshot"
RELEASE EXPLICIT ROCKSDB SNAPSHOT;
"con1: The new row should not be seen"
SELECT* FROM T1;
a
1
2
3
4
5
6
COMMIT;
DROP TABLE T1;
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