May 2017
Beginner
416 pages
10h 37m
English
Content preview from Mastering PostgreSQL 9.6
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Observing deadlocks and similar issues
Deadlocks are an important issue and can happen in every database I am aware of. Basically, a deadlock will happen if two transactions have to wait on each other.
In this section, you will see how this can happen. Let us suppose we have a table containing two rows:
CREATE TABLE t_deadlock (id int);INSERT INTO t_deadlock VALUES (1), (2);
The next listing shows what can happen:
|
Transaction 1 |
Transaction 2 |
|
BEGIN; |
BEGIN; |
|
UPDATE t_deadlock SET id = id * 10 WHERE id = 1; |
UPDATE t_deadlock SET id = id * 10 WHERE id = 2; |
|
UPDATE t_deadlock SET id = id * 10 WHERE id = 2; |
|
|
Waiting on transaction 2 |
UPDATE t_deadlock SET id = id * 10 WHERE id = 1; |
|
Waiting on transaction 2 |
Waiting ... |
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