Transactions etc

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Yevhen Shyshkin

Overview lecture about DB transactions and locks

Транзакции и все такое прочее
Транзакции
и все такое прочее
Евгений Шишкин
yshyshkin@orocrm.com
https://github.com/yshyshkin

Транзакции и все такое прочее
— Разве это чепуха? Слыхала я такую
чепуху, рядом с которой эта разумна,
как толковый словарь!

Транзакции и все такое прочее
Что такое транзакция?
START
COMMIT
Request 1 Successful
Request 2 Successful
Request 3 Successful
Request 1 Successful
Request 2 Successful
Request 3 Failed
ROLLBACK

Транзакции и все такое прочее
Атомарность

Транзакции и все такое прочее
Уровни изоляции
Read
uncommitted
Read
committed
Repeatable
read Serialized

Транзакции и все такое прочее
Read uncommitted

Транзакции и все такое прочее
Read committed

Транзакции и все такое прочее
Repeatable read

Транзакции и все такое прочее
Serializable

Транзакции и все такое прочее
Слишком много транзакций!

Транзакции и все такое прочее
Блокировка

Транзакции и все такое прочее
...на чтение (shared)

Транзакции и все такое прочее
...на запись (exclusive)

Транзакции и все такое прочее
Что еще почитать?
Кристофер Дейт. Введение в системы баз данных
http://coding-geek.com/how-databases-work/
http://vladmihalcea.com/2014/01/05/a-beginners-guide-
to-acid-and-database-transactions/

Транзакции и все такое прочее
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Transactions etc

1. Транзакции и все такое прочее Транзакции и все такое прочее Евгений Шишкин yshyshkin@orocrm.com https://github.com/yshyshkin

2. Транзакции и все такое прочее — Разве это чепуха? Слыхала я такую чепуху, рядом с которой эта разумна, как толковый словарь!

3. Транзакции и все такое прочее Что такое транзакция? START COMMIT Request 1 Successful Request 2 Successful Request 3 Successful Request 1 Successful Request 2 Successful Request 3 Failed ROLLBACK

4. Транзакции и все такое прочее Атомарность

5. Транзакции и все такое прочее Уровни изоляции Read uncommitted Read committed Repeatable read Serialized

6. Транзакции и все такое прочее Read uncommitted

7. Транзакции и все такое прочее Read committed

8. Транзакции и все такое прочее Repeatable read

9. Транзакции и все такое прочее Serializable

10. Транзакции и все такое прочее Слишком много транзакций!

11. Транзакции и все такое прочее Блокировка

12. Транзакции и все такое прочее ...на чтение (shared)

13. Транзакции и все такое прочее ...на запись (exclusive)

14. Транзакции и все такое прочее Что еще почитать? Кристофер Дейт. Введение в системы баз данных http://coding-geek.com/how-databases-work/ http://vladmihalcea.com/2014/01/05/a-beginners-guide- to-acid-and-database-transactions/

15. Транзакции и все такое прочее Вопросы и ответы

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