http://gigaom.com/cloud/ex-facebookers-launch-memsql-to-make-your-database-fly/

-- 多主-從

http://www.mysqlops.com/2012/02/14/diy_multi_master_replication.html

http://www.cnblogs.com/liuhao/archive/2012/06/26/2563702.html

前facebook員工和前微軟sql server工程師聯合搞的一個分布式關系數據庫

全部內存運行，將sql轉化成速度更快的c++, 原理類似HipHop

有mysql api, 完全兼容mysql,沒有學習使用成本

速度是mysql的30倍，每秒可處理150萬的事務

官方網站：http://memsql.com/

參考文檔：http://space.itpub.net/7607759/viewspace-733545

參考官方文檔：http://developers.memsql.com/docs/1b/

http://developers.memsql.com/docs/1b/

-- ==============================================================

1 ?Install

wget http://download.memsql.com/814d3816f4084953833243fbf6c40d37/memsqlbin_amd64.tar.gz

tar xvfz memsqlbin_amd64.tar.gz

cd memsqlbin

./check_system

Warning: The version of CentOS that you're using (5.5) is too low.

MemSQL supports versions 6.0 and up.

/home/manchun/memsqlbin/objdir/usr/local/bin/memsql-g++: /lib64/libc.so.6: version GLIBC_2.11' not found (required by /home/manchun/memsqlbin/objdir/usr/local/bin/memsql-g++)

【解決辦法】安裝glibc

[root@banggo ~]#

wget http://ftp.gnu.org/pub/gnu/glibc/glibc-2.11.tar.gz

tar zxvf glibc-2.11.tar.gz

cd glibc-2.11

mkdir glibc-2.11-build

退出去在別的目錄執行如下編譯

/usr/src/glibc-2.11/configure --prefix=/usr/src/glibc-2.11/glibc-2.11-build/

error:

checking for .cfi_personality and .cfi_lsda pseudo-ops... no

configure: error: assembler too old, .cfi_personality support missing

【解決】參考網址

http://groups.google.com/group/rocks-clusters/browse_thread/thread/4c9298adecf5a335

http://www.caritasem.com/?p=162

I couldn't overcome that problem, and I'm wondering how I can, but I

said, "hey cuda only requires glibc-2.7, so lets compile that". I went

ahead, and installed it into /share/apps/glibc-2.7. So here comes the

main question: how can I link CUDA C to the glibc-2.7 installed in

/share/apps ? Years ago, Tim Carlson has said "It is really not

practical to try and upgrade glibc to 2.5. You might want to try

installing a glibc 2.5 from source in /share/apps/glibc-2.5 and then

use LD_PRELOAD to load that library in for you CMAQ binary.", but I

don't know how to use LD_PRELOAD, and I would appreciate any

guideline.

[換成2.8]

[root@banggo ~]#

wget http://ftp.gnu.org/pub/gnu/glibc/glibc-2.8.tar.gz

tar zxvf glibc-2.8.tar.gz

cd glibc-2.8

mkdir glibc-2.8-build

退出去在別的目錄執行如下編譯

/usr/src/glibc-2.8/configure --prefix=/usr/src/glibc-2.8/glibc-2.8-build/

make

make install

繼續執行剛才的check_system

[root@banggo memsqlbin]# ./check_system

Warning: The version of CentOS that you're using (5.5) is too low.

MemSQL supports versions 6.0 and up.

/home/manchun/memsqlbin/objdir/usr/local/bin/memsql-g++: /lib64/libc.so.6: version 'GLIBC_2.11' not found (required by /home/manchun/memsqlbin/objdir/usr/local/bin/memsql-g++)

【】我不得不承認，我out了，仔細一看，原來需要centos 6.0的。

2 重新安裝wget http://download.memsql.com/814d3816f4084953833243fbf6c40d37/memsqlbin_amd64.tar.gz

tar xvfz memsqlbin_amd64.tar.gz

cd memsqlbin

./check_system

報錯如下：

Warning: The recommended configuration for MemSQL is at least 8 GB of RAM

【】解決方案：

let "mem_mb=$(free -m | sed ?-n -e '/^Mem:/s/^[^0-9]*\([0-9]*\) .*/\1/p')";

if [ $mem_mb -lt 1000 ]; then

echo "Warning: The recommended configuration for MemSQL is at least 1 GB of RAM" 1>&2

invalid='1'

fi

[root@memdb memsqlbin]# ?./check_system

System check successful

3 登陸測試

[root@memdb memsqlbin]# ?./memsqld --port 3308

299691 2012-06-27 13:26:26 WARNING: SSE4.2 is not supported. Resorting to software CRC32C.

497378 2012-06-27 13:26:27 INFO: Log level changed to 0

120627 13:26:27 [ERROR] Fatal error: Please run MemSQL as a non-root user or specify -u root on the command line.

120627 13:26:27 [ERROR] Aborting

120627 13:26:27 [Note] ./memsqld: Shutdown complete

[root@memdb memsqlbin]# ?./memsqld -u root ?--port 3308

292356 2012-06-27 13:26:54 WARNING: SSE4.2 is not supported. Resorting to software CRC32C.

480363 2012-06-27 13:26:55 INFO: Log level changed to 0

120627 13:26:55 [Note] ./memsqld: ready for connections.

Version: '1b' ?socket: '/tmp/memsql.sock' ?port: 3308

4 客戶端使用

[root@memdb ~]# mysql -uroot -p -h 127.0.0.1 -P3308 --prompt="MemSQL> "

Enter password:

Welcome to the MySQL monitor. ?Commands end with ; or \g.

Your MySQL connection id is 253

Server version: 5.5.8 MemSQL source distribution

Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.

This software comes with ABSOLUTELY NO WARRANTY. This is free software,

and you are welcome to modify and redistribute it under the GPL v2 license

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MemSQL>

MemSQL> show databases;

+--------------------+

| Database ? ? ? ? ? |

+--------------------+

| information_schema |

| memsql ? ? ? ? ? ? |

+--------------------+

2 rows in set (0.00 sec)

MemSQL> use memsql;

Database changed

MemSQL> show tables;

Empty set (0.00 sec)

MemSQL> use information_schema;

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

Database changed

MemSQL> show tables;

+---------------------------------------+

| Tables_in_information_schema ? ? ? ? ?|

+---------------------------------------+

| CHARACTER_SETS ? ? ? ? ? ? ? ? ? ? ? ?|

| COLLATIONS ? ? ? ? ? ? ? ? ? ? ? ? ? ?|

| COLLATION_CHARACTER_SET_APPLICABILITY |

| COLUMNS ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? |

| COLUMN_PRIVILEGES ? ? ? ? ? ? ? ? ? ? |

| ENGINES ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? |

| EVENTS ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?|

| FILES ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? |

| GLOBAL_STATUS ? ? ? ? ? ? ? ? ? ? ? ? |

| GLOBAL_VARIABLES ? ? ? ? ? ? ? ? ? ? ?|

| KEY_COLUMN_USAGE ? ? ? ? ? ? ? ? ? ? ?|

| PARAMETERS ? ? ? ? ? ? ? ? ? ? ? ? ? ?|

| PARTITIONS ? ? ? ? ? ? ? ? ? ? ? ? ? ?|

| PLUGINS ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? |

| PROCESSLIST ? ? ? ? ? ? ? ? ? ? ? ? ? |

| PROFILING ? ? ? ? ? ? ? ? ? ? ? ? ? ? |

| REFERENTIAL_CONSTRAINTS ? ? ? ? ? ? ? |

| ROUTINES ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?|

| SCHEMATA ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?|

| SCHEMA_PRIVILEGES ? ? ? ? ? ? ? ? ? ? |

| STATISTICS ? ? ? ? ? ? ? ? ? ? ? ? ? ?|

| TABLES ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?|

| TABLESPACES ? ? ? ? ? ? ? ? ? ? ? ? ? |

| TABLE_CONSTRAINTS ? ? ? ? ? ? ? ? ? ? |

| TABLE_PRIVILEGES ? ? ? ? ? ? ? ? ? ? ?|

| TRIGGERS ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?|

| USER_PRIVILEGES ? ? ? ? ? ? ? ? ? ? ? |

| VIEWS ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? |

+---------------------------------------+

28 rows in set (0.00 sec)

MemSQL>

庫名字很mysql一模一樣啊，好驚奇啊，居然information_schema都有，而且里面的表名字也是一模一樣的。

5 配置文件

看看memsql有沒有跟mysql類似的配置文件呢，如下，果然找到了

[root@memdb memsqlbin]# ll /root/memsqlbin/memsql.cnf

-rw-r--r--. 1 1001 1001 1026 ?6月 18 20:07 /root/memsqlbin/memsql.cnf

6 用戶管理測試

-- 創建新賬號

MemSQL> grant all on *.* to tim@'%' identified by "tim" ?with grant option;

Query OK, 1 row affected (0.01 sec)

MemSQL> exit

Bye

-- 重新登錄，輸入-p密碼，進不去，不輸入密碼一回車，反倒進去了，怪哉!

[root@memdb memsqlbin]# mysql -utim -ptim -h 127.0.0.1 -P3308 --prompt="MemSQL> "

ERROR 1045 (28000): Access denied for user 'tim'@'localhost' (using password: YES)

[root@memdb memsqlbin]# mysql -utim -p -h 127.0.0.1 -P3308 --prompt="MemSQL> "

Enter password:

Welcome to the MySQL monitor. ?Commands end with ; or \g.

Your MySQL connection id is 253

Server version: 5.5.8 MemSQL source distribution

Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.

This software comes with ABSOLUTELY NO WARRANTY. This is free software,

and you are welcome to modify and redistribute it under the GPL v2 license

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MemSQL>

CREATE TABLE test (

id int(11) NOT NULL AUTO_INCREMENT,

excel_id varchar(100) NOT NULL,

rpt_id int(10) unsigned NOT NULL,

acc_std tinyint(3) unsigned NOT NULL,

prd_year int(10) unsigned NOT NULL,

prd_qtr tinyint(3) unsigned NOT NULL,

accumulate char(3) NOT NULL,

biz_cd tinyint(3) unsigned NOT NULL,

acc_cd tinyint(3) unsigned NOT NULL,

row_num int(10) unsigned NOT NULL,

col_num int(10) unsigned NOT NULL,

data_id int(10) unsigned NOT NULL,

data_trace mediumtext NOT NULL COMMENT 'trace信息',

trace_edit tinyint(1) NOT NULL,

upd_stmp timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',

PRIMARY KEY (id)

) ;

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