Part 1:

2015. 2. 10. [122]

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2015 February (No.122)

01

SW Webzine

. (Cache)

.1)

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. ,

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CPU L1, L2, L3 CPU ,

RAM DISK , web iOS, Android

, , DB ,

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1.1 CPU

CPU . CPU Main

Bus ,

Register Cache . CPU

. CPU Cache , Main

Memory . Main Memory .

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1_CPU

: http://lwn.net/Articles/252125/

1) : http://ko.wikipedia.org/wiki/%EC%BA%90%EC%8B%9C

02

CPU

. CPU

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2_

: http://www.buildagamingpc.org/gaming-cpu/cpu-cache

CPU , ,

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,

. ,

. (Caching) ,

. write read

. read write .

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, redis memcached

.

, DB . L4

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DB .

2015 February (No.122)

03

SW Webzine

3_ , DB

, DB .

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DB . ,

SQL , DB / , DB connection

. DB connection

. DB .

4_

DB SQL (Query) . DB

, DB I/O . DB index , SQL

prepared statement ,

query statement . (transaction)

.

DB SQL Query .

DB connection context switching ,

04

, DB connection connection pool

. DB connection pool DB connection

DB Gateway(DB Broker) DB , ,

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5_DB DB Gateway

. DB

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Collection . LRU2)

. LRU

. (Object) 3) . 6_ DB

2) LRU(Least Recently Used): 3) .

2015 February (No.122)

05

SW Webzine

,

Collection .

ehcache guava cache .

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DB

. DB

. DB DB4) . , DB Map Table -

. DB

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7_ DB

DB (O(1))

. DB , DBA DB

, Map -(key-value)

. Devops ,

, ,

. Redis Memcached

. ( Redis, Memcached Terracotta cache, Jboss cache

, Redis, Memcached .)

/ .

4) DB .

06

8_

9_ Use Case #1

10_ Use Case #2

Use Case.

2015 February (No.122)

07

SW Webzine

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DB

. DB

. ( 1ms

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64GB 10 640GB

. 1(millisecond)

. DB

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TTL(Time to live, )

. ,

Devops memcached

redis .

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, . ,

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3.1

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. DB

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DB .

08

10_DB

, (, cron

) .

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11_

Map . .

(, DB)

(Garbage Collection , , TTL, LRU

)

( , )

,

. Java Ehcache .

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2015 February (No.122)

09

SW Webzine

3.2 DB (Mysql)

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. DBA ,

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. DB - -(Map) , SQL . blob List

Map blob .

12_cache statement

create table simple_cache (cache_key varchar(10) not null,cache_value varchar(50),update_time datetime,primary key (cache_key))// create table map_cache (cache_key varchar(10) not null,cache_value blob,update_time datetime,primary key (cache_key))

DB DB Cron

DB SQL DB .

DB .

DB - . DB

,

. DB DB DB - -

. DB DB .

13_ DB DB

10

DB DB/ DB .

cron , DB

DB .

14_ DB

3.3

2.1 ,

Gabage Collection

(Stop the world) .

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,

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15_

2015 February (No.122)

11

SW Webzine

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CPU .

CPU .

. DB

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, . Redis Memcached

Part 2 .