This document discusses sharding and partitioning in MySQL. It describes how sharding works by splitting tables across multiple databases based on a sharding key like user ID. It also covers partitioning, where a single table is divided into multiple partitions based on a partition function like date, to improve query performance and allow dropping old data by removing partitions. Examples are given of creating partitioned tables and querying on specific partitions.

1. MySQL
mysql-casual#1 (2010-12-10)
@xaicron
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2. • @xaicron ( )
• works at DeNA
• blog http://blog.livedoor.jp/xaicron/
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3. Perl
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4. JPerl Advent Calender
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6. http://perl-users.jp/articles/advent-calendar/help.html
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8. MySQL
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13. myfinder
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15. cv.
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16. Agenda
• Sharding
• Partitioning
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17. Sharding
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18. Sharding
• Shared Nothing
• DB
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19. user_id
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20. 2010 12 13

21. Sharding
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22. DB
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23. •
• Disk IO
•
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24. Sharding
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25. • JOIN
•
•
• orz
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27. user_id auto_increment
DB
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28. DB
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30. •
•
•
•
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31. Partitioning
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32. Partitioning
•
• SELECT
Partition drop
• 5.1 --with-partition
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35. Partitioning
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36. •
• Partition
• Partition SELECT
• SUM() COUNT()
•
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38. ALTER TABLE
table_name
DROP PARTITIONS!!
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39. Partition
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42. SELECT
Partition
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43. CREATE TABLE `tweet` (
`id` bigint(20) NOT NULL,
`tweet` varchar(140) NOT NULL,
`created_on` timestamp NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
PARTITION BY RANGE ( UNIX_TIMESTAMP(created_on) ) (
PARTITION p20101210 VALUE LESS THAN (1291906800),
PARTITION p20101211 VALUE LESS THAN (1291993200),
PARTITION p20101212 VALUE LESS THAN (1292079600),
PARTITION p20101213 VALUE LESS THAN (1292166000),
PARTITION p20101214 VALUE LESS THAN (1292252400)
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44. 20101210
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45. SELECT * FROM tweet WHERE created_on >
‘20101210’ AND tweet = ‘mysqlcasual’;
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46. p20101210
partition
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47. EXPLAIN PARTITION SELECT ...
partition
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48. Partitioning
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49. • PARTITION
created_on)
KEY (
Primary Key
• UNIQ
• SELECT
• UNIX_TIMESTAMP()
v5.1.43
!!
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51. •
• MySQL
• (
cron
)
• !!
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52. cv.
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53. Sharding Partitioning
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