本文旨在从安装部署中了解OGG的知识
目前许多客户环境都已经在广泛使用OGG。由于工作需要,近期我也会系统的学习下OGG,目前学习主要以OGG在Oracle数据库之间的同步来说明一些基本概念,后续看时间情况可能了解OGG对其他主流数据库的同步。

1.1 简单介绍 

> Oracle Golden Gate软件是一种基于日志的结构化数据复制备份软件,它通过解析源数据库在线日志或归档日志获得数据的增量变化,再将这些变化应用到目标数据库,从而实现源数据库与目标数据库同步。 
> Oracle Golden Gate可以在异构的IT基础结构(包括几乎所有常用操作系统平台和数据库平台)之间实现大量数据亚秒一级的实时复制,从而可以在应急系统、在线报表、实时数据仓库供应、交易跟踪、数据同步、集中/分发、容灾、数据库升级和移植、双业务中心等多个场景下应用。
> Oracle Golden Gate可以实现一对一、广播(一对多)、聚合(多对一)、双向、点对点、级联等多种灵活的拓扑结构
 
假设已有源数据库和目标数据库,且分别部署好OGG软件。
源数据库部署的OGG,简称源OGG
目标数据库部署的OGG,简称目标OGG

1.2 同步的过程

就是源OGG的EXTRACT进程从源数据库的联机redologs中抽取获得变化,把它写到本地trail文件中,然后源OGG的Data pump进程再从本地trail文件中抽取变化传给目标OGG的collector进程,目标的collector进程再把这些变化写入目标trail文件中,最后目标OGG的Replicat进程把目标trail文件中记录的变化应用到目标数据库中。
如果要同步的表数量比较多或是业务有区分,需要分开管理,OGG是支持分开多个extract进程,多个datapump进程,多个replicat进程,这样,可以启动或停止其中任意一类同步,而不影响其他的同步。
 
需要注意的是,每套OGG所有的进程都是由其Manager进程来管理的,也就是说Manager进程负责管理,启动关闭其他进程。OGG用组来表示它的进程,上面简单提到的extract、replicat这些进程,实际上需要各自的参数文件、检查点文件等。这些内容共同组成一个组,且每个组需要有一个组名字。

1.3 Oracle Golden Gate的简要体系图

OGG异构平台安装部署 MySQL->Oracle
  • OGG的检查点信息
对于源OGG只能以文件形式默认存放在GGHOME/dirchk目录下,一个组对应一个文件。
而对于目标OGG检查点信息可以存放在数据库表中,且建议存放到数据库表中。
 
对于源数据库,如果要使用OGG,需要配置supplemental logging,原因是OGG相当于逻辑同步,除了要记录被修改的记录,还要把能够标识这条记录的信息同时记录在日志中。这样的话,Oracle默认情况是不达标的,需要额外开启supplemental logging才可以。
具体做法是:在数据库级别开启最小附加日志,在需要同步的表级别开启详细附加日志。
 
#数据库级别开启强制记录日志和最小附加日志:
SQL> alter database force logging;
SQL> alter database add supplemental log data;
 
#表级别开启详细附加日志(这里举例是jy用户下的t_second表):
GGSCI> add trandata jy.t_second
 
对于目标数据库,配置检查点信息到目标数据库表中,具体做法:
1.目标GG的全局参数(./globals)配置
checkpointtable ggt.chkpt
2.命令添加checkpointtable
GGSCI> add checkpointtable ggt.chkpt
 
此外数据库需要启用Golden Gate复制参数:enable_goldengate_replication
SQL> alter system set enable_goldengate_replication=true;

二、测试实验

2.1 实验环境介绍

          ----------                  ----------
          |        |                  |        |
          |        |                  |        |
          |        |                  |        |
          |        |                  |        |
          | MySQL  |  ------------>   | Oracle |
          |        |                  |        |
          |        |                  |        |
          |        |                  |        |
          ----------                  ----------

Source Host    :awen001(MySQL)     Target Host    :awen002(Oracle)
IP Addr        :192.168.1.21       IP Addr        :192.168.1.22
Manager Account:root(MySQL)        Manager Account:ggt_admin(Oracle)
Srouce DB      :test01(MySQL)      Target Account :result01(Oracle)
Source Table   :Mar01              Target Table   :Mar02 
OS             :CentOS 7.3         OS             :CentOS 7.3

OGG安装文件

191003_ggs_Linux_x64_MySQL_64bit.zip
191004_fbo_ggs_Linux_x64_shiphome.zip

2.2 源端MySQL数据库配置

1. 创建操作系统MySQL用户

userdel mysql
groupadd -g 1007 mysql useradd -u 1103 -g mysql mysql echo "mysql" | passwd --stdin mysql id mysql
特别声明:创建MySQL用户的目的是要把Oracle Golden Gate安装到MySQL用户下,否则当OGG读取MySQL二进制索引文件
[log-bin-index=/var/lib/mysql/binary-log.index]的时候,会因为没有相关权限而影响OGG的部署。

2. 镜像 & yum源

查看服务器挂载镜像以及yum源配置
[root@awen001 ~]# df -h | grep CentOS
/dev/sr0             4.1G  4.1G     0  100% /run/media/root/CentOS 7 x86_64
[root@awen001 ~]# cat /etc/yum.repos.d/yum.repo 
[redhat7.6] 
name=redhat7.6 
baseurl=file:///run/media/root/CentOS\ 7\ x86_64/
gpgcheck=0 
enabled=1
[root@awen001 ~]# yum repolist
已加载插件:fastestmirror, langpacks
Loading mirror speeds from cached hostfile
源标识                                                                     源名称                                                                    状态
!redhat7.6                                                                 redhat7.6                                                                 3,831
repolist: 3,831

3. 安装数据库

CentOS 7自带MariaDB替代默认的MySQL客户端安装包。MariaDB数据库管理系统是MySQL的一个分支,主要由开源社区在维护,采用GPL授权许可 MariaDB的目的是完全兼容MySQL,包括API和命令行,使之能轻松成为MySQL的代替品。
yum install -y mariadb*
[root@awen001 ~]# yum install -y mariadb*
已加载插件:fastestmirror, langpacks
redhat7.6                                                                                                                          | 3.6 kB  00:00:00     
Loading mirror speeds from cached hostfile
软件包 1:mariadb-libs-5.5.52-1.el7.x86_64 已安装并且是最新版本
正在解决依赖关系
--> 正在检查事务
---> 软件包 mariadb.x86_64.1.5.5.52-1.el7 将被 安装
---> 软件包 mariadb-bench.x86_64.1.5.5.52-1.el7 将被 安装
--> 正在处理依赖关系 perl(GD),它被软件包 1:mariadb-bench-5.5.52-1.el7.x86_64 需要
--> 正在处理依赖关系 perl(DBI),它被软件包 1:mariadb-bench-5.5.52-1.el7.x86_64 需要
---> 软件包 mariadb-devel.x86_64.1.5.5.52-1.el7 将被 安装
--> 正在处理依赖关系 openssl-devel(x86-64),它被软件包 1:mariadb-devel-5.5.52-1.el7.x86_64 需要
---> 软件包 mariadb-server.x86_64.1.5.5.52-1.el7 将被 安装
--> 正在处理依赖关系 perl-DBD-MySQL,它被软件包 1:mariadb-server-5.5.52-1.el7.x86_64 需要
---> 软件包 mariadb-test.x86_64.1.5.5.52-1.el7 将被 安装
--> 正在处理依赖关系 perl(Test::More),它被软件包 1:mariadb-test-5.5.52-1.el7.x86_64 需要
--> 正在处理依赖关系 perl(Env),它被软件包 1:mariadb-test-5.5.52-1.el7.x86_64 需要
--> 正在检查事务
---> 软件包 openssl-devel.x86_64.1.1.0.1e-60.el7 将被 安装
--> 正在处理依赖关系 krb5-devel(x86-64),它被软件包 1:openssl-devel-1.0.1e-60.el7.x86_64 需要
---> 软件包 perl-DBD-MySQL.x86_64.0.4.023-5.el7 将被 安装
---> 软件包 perl-DBI.x86_64.0.1.627-4.el7 将被 安装
--> 正在处理依赖关系 perl(RPC::PlServer) >= 0.2001,它被软件包 perl-DBI-1.627-4.el7.x86_64 需要
--> 正在处理依赖关系 perl(RPC::PlClient) >= 0.2000,它被软件包 perl-DBI-1.627-4.el7.x86_64 需要
---> 软件包 perl-Env.noarch.0.1.04-2.el7 将被 安装
---> 软件包 perl-GD.x86_64.0.2.49-3.el7 将被 安装
---> 软件包 perl-Test-Simple.noarch.0.0.98-243.el7 将被 安装
--> 正在检查事务
---> 软件包 krb5-devel.x86_64.0.1.14.1-26.el7 将被 安装
--> 正在处理依赖关系 libverto-devel,它被软件包 krb5-devel-1.14.1-26.el7.x86_64 需要
--> 正在处理依赖关系 libselinux-devel,它被软件包 krb5-devel-1.14.1-26.el7.x86_64 需要
--> 正在处理依赖关系 libcom_err-devel,它被软件包 krb5-devel-1.14.1-26.el7.x86_64 需要
--> 正在处理依赖关系 keyutils-libs-devel,它被软件包 krb5-devel-1.14.1-26.el7.x86_64 需要
---> 软件包 perl-PlRPC.noarch.0.0.2020-14.el7 将被 安装
--> 正在处理依赖关系 perl(Net::Daemon) >= 0.13,它被软件包 perl-PlRPC-0.2020-14.el7.noarch 需要
--> 正在处理依赖关系 perl(Net::Daemon::Test),它被软件包 perl-PlRPC-0.2020-14.el7.noarch 需要
--> 正在处理依赖关系 perl(Net::Daemon::Log),它被软件包 perl-PlRPC-0.2020-14.el7.noarch 需要
--> 正在处理依赖关系 perl(Compress::Zlib),它被软件包 perl-PlRPC-0.2020-14.el7.noarch 需要
--> 正在检查事务
---> 软件包 keyutils-libs-devel.x86_64.0.1.5.8-3.el7 将被 安装
---> 软件包 libcom_err-devel.x86_64.0.1.42.9-9.el7 将被 安装
---> 软件包 libselinux-devel.x86_64.0.2.5-6.el7 将被 安装
--> 正在处理依赖关系 libsepol-devel(x86-64) >= 2.5-6,它被软件包 libselinux-devel-2.5-6.el7.x86_64 需要
--> 正在处理依赖关系 pkgconfig(libsepol),它被软件包 libselinux-devel-2.5-6.el7.x86_64 需要
--> 正在处理依赖关系 pkgconfig(libpcre),它被软件包 libselinux-devel-2.5-6.el7.x86_64 需要
---> 软件包 libverto-devel.x86_64.0.0.2.5-4.el7 将被 安装
---> 软件包 perl-IO-Compress.noarch.0.2.061-2.el7 将被 安装
--> 正在处理依赖关系 perl(Compress::Raw::Zlib) >= 2.061,它被软件包 perl-IO-Compress-2.061-2.el7.noarch 需要
--> 正在处理依赖关系 perl(Compress::Raw::Bzip2) >= 2.061,它被软件包 perl-IO-Compress-2.061-2.el7.noarch 需要
---> 软件包 perl-Net-Daemon.noarch.0.0.48-5.el7 将被 安装
--> 正在检查事务
---> 软件包 libsepol-devel.x86_64.0.2.5-6.el7 将被 安装
---> 软件包 pcre-devel.x86_64.0.8.32-15.el7_2.1 将被 安装
---> 软件包 perl-Compress-Raw-Bzip2.x86_64.0.2.061-3.el7 将被 安装
---> 软件包 perl-Compress-Raw-Zlib.x86_64.1.2.061-4.el7 将被 安装
--> 解决依赖关系完成

依赖关系解决

==========================================================================================================================================================
 Package                                       架构                         版本                                    源                               大小
==========================================================================================================================================================
正在安装:
 mariadb                                       x86_64                       1:5.5.52-1.el7                          redhat7.6                       8.7 M
 mariadb-bench                                 x86_64                       1:5.5.52-1.el7                          redhat7.6                       387 k
 mariadb-devel                                 x86_64                       1:5.5.52-1.el7                          redhat7.6                       750 k
 mariadb-server                                x86_64                       1:5.5.52-1.el7                          redhat7.6                        11 M
 mariadb-test                                  x86_64                       1:5.5.52-1.el7                          redhat7.6                       8.1 M
为依赖而安装:
 keyutils-libs-devel                           x86_64                       1.5.8-3.el7                             redhat7.6                        37 k
 krb5-devel                                    x86_64                       1.14.1-26.el7                           redhat7.6                       651 k
 libcom_err-devel                              x86_64                       1.42.9-9.el7                            redhat7.6                        31 k
 libselinux-devel                              x86_64                       2.5-6.el7                               redhat7.6                       186 k
 libsepol-devel                                x86_64                       2.5-6.el7                               redhat7.6                        74 k
 libverto-devel                                x86_64                       0.2.5-4.el7                             redhat7.6                        12 k
 openssl-devel                                 x86_64                       1:1.0.1e-60.el7                         redhat7.6                       1.2 M
 pcre-devel                                    x86_64                       8.32-15.el7_2.1                         redhat7.6                       479 k
 perl-Compress-Raw-Bzip2                       x86_64                       2.061-3.el7                             redhat7.6                        32 k
 perl-Compress-Raw-Zlib                        x86_64                       1:2.061-4.el7                           redhat7.6                        57 k
 perl-DBD-MySQL                                x86_64                       4.023-5.el7                             redhat7.6                       140 k
 perl-DBI                                      x86_64                       1.627-4.el7                             redhat7.6                       802 k
 perl-Env                                      noarch                       1.04-2.el7                              redhat7.6                        16 k
 perl-GD                                       x86_64                       2.49-3.el7                              redhat7.6                       173 k
 perl-IO-Compress                              noarch                       2.061-2.el7                             redhat7.6                       260 k
 perl-Net-Daemon                               noarch                       0.48-5.el7                              redhat7.6                        51 k
 perl-PlRPC                                    noarch                       0.2020-14.el7                           redhat7.6                        36 k
 perl-Test-Simple                              noarch                       0.98-243.el7                            redhat7.6                       170 k

事务概要
==========================================================================================================================================================
安装  5 软件包 (+18 依赖软件包)

总下载量:33 M
安装大小:244 M
Downloading packages:
----------------------------------------------------------------------------------------------------------------------------------------------------------
总计                                                                                                                       14 MB/s |  33 MB  00:00:02     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  正在安装    : 1:mariadb-5.5.52-1.el7.x86_64                                                                                                        1/23 
  正在安装    : perl-Net-Daemon-0.48-5.el7.noarch                                                                                                    2/23 
  正在安装    : 1:perl-Compress-Raw-Zlib-2.061-4.el7.x86_64                                                                                          3/23 
  正在安装    : libverto-devel-0.2.5-4.el7.x86_64                                                                                                    4/23 
  正在安装    : perl-GD-2.49-3.el7.x86_64                                                                                                            5/23 
  正在安装    : perl-Test-Simple-0.98-243.el7.noarch                                                                                                 6/23 
  正在安装    : libcom_err-devel-1.42.9-9.el7.x86_64                                                                                                 7/23 
  正在安装    : perl-Env-1.04-2.el7.noarch                                                                                                           8/23 
  正在安装    : perl-Compress-Raw-Bzip2-2.061-3.el7.x86_64                                                                                           9/23 
  正在安装    : perl-IO-Compress-2.061-2.el7.noarch                                                                                                 10/23 
  正在安装    : perl-PlRPC-0.2020-14.el7.noarch                                                                                                     11/23 
  正在安装    : perl-DBI-1.627-4.el7.x86_64                                                                                                         12/23 
  正在安装    : perl-DBD-MySQL-4.023-5.el7.x86_64                                                                                                   13/23 
  正在安装    : 1:mariadb-server-5.5.52-1.el7.x86_64                                                                                                14/23 
  正在安装    : pcre-devel-8.32-15.el7_2.1.x86_64                                                                                                   15/23 
  正在安装    : libsepol-devel-2.5-6.el7.x86_64                                                                                                     16/23 
  正在安装    : libselinux-devel-2.5-6.el7.x86_64                                                                                                   17/23 
  正在安装    : keyutils-libs-devel-1.5.8-3.el7.x86_64                                                                                              18/23 
  正在安装    : krb5-devel-1.14.1-26.el7.x86_64                                                                                                     19/23 
  正在安装    : 1:openssl-devel-1.0.1e-60.el7.x86_64                                                                                                20/23 
  正在安装    : 1:mariadb-devel-5.5.52-1.el7.x86_64                                                                                                 21/23 
  正在安装    : 1:mariadb-test-5.5.52-1.el7.x86_64                                                                                                  22/23 
  正在安装    : 1:mariadb-bench-5.5.52-1.el7.x86_64                                                                                                 23/23 
  验证中      : 1:mariadb-test-5.5.52-1.el7.x86_64                                                                                                   1/23 
  验证中      : keyutils-libs-devel-1.5.8-3.el7.x86_64                                                                                               2/23 
  验证中      : 1:openssl-devel-1.0.1e-60.el7.x86_64                                                                                                 3/23 
  验证中      : 1:mariadb-devel-5.5.52-1.el7.x86_64                                                                                                  4/23 
  验证中      : libsepol-devel-2.5-6.el7.x86_64                                                                                                      5/23 
  验证中      : pcre-devel-8.32-15.el7_2.1.x86_64                                                                                                    6/23 
  验证中      : libselinux-devel-2.5-6.el7.x86_64                                                                                                    7/23 
  验证中      : perl-Compress-Raw-Bzip2-2.061-3.el7.x86_64                                                                                           8/23 
  验证中      : perl-Env-1.04-2.el7.noarch                                                                                                           9/23 
  验证中      : libcom_err-devel-1.42.9-9.el7.x86_64                                                                                                10/23 
  验证中      : perl-Test-Simple-0.98-243.el7.noarch                                                                                                11/23 
  验证中      : perl-GD-2.49-3.el7.x86_64                                                                                                           12/23 
  验证中      : libverto-devel-0.2.5-4.el7.x86_64                                                                                                   13/23 
  验证中      : 1:mariadb-server-5.5.52-1.el7.x86_64                                                                                                14/23 
  验证中      : 1:mariadb-bench-5.5.52-1.el7.x86_64                                                                                                 15/23 
  验证中      : perl-DBI-1.627-4.el7.x86_64                                                                                                         16/23 
  验证中      : perl-DBD-MySQL-4.023-5.el7.x86_64                                                                                                   17/23 
  验证中      : 1:mariadb-5.5.52-1.el7.x86_64                                                                                                       18/23 
  验证中      : 1:perl-Compress-Raw-Zlib-2.061-4.el7.x86_64                                                                                         19/23 
  验证中      : perl-Net-Daemon-0.48-5.el7.noarch                                                                                                   20/23 
  验证中      : perl-IO-Compress-2.061-2.el7.noarch                                                                                                 21/23 
  验证中      : perl-PlRPC-0.2020-14.el7.noarch                                                                                                     22/23 
  验证中      : krb5-devel-1.14.1-26.el7.x86_64                                                                                                     23/23 

已安装:
  mariadb.x86_64 1:5.5.52-1.el7        mariadb-bench.x86_64 1:5.5.52-1.el7   mariadb-devel.x86_64 1:5.5.52-1.el7   mariadb-server.x86_64 1:5.5.52-1.el7  
  mariadb-test.x86_64 1:5.5.52-1.el7  

作为依赖被安装:
  keyutils-libs-devel.x86_64 0:1.5.8-3.el7             krb5-devel.x86_64 0:1.14.1-26.el7            libcom_err-devel.x86_64 0:1.42.9-9.el7               
  libselinux-devel.x86_64 0:2.5-6.el7                  libsepol-devel.x86_64 0:2.5-6.el7            libverto-devel.x86_64 0:0.2.5-4.el7                  
  openssl-devel.x86_64 1:1.0.1e-60.el7                 pcre-devel.x86_64 0:8.32-15.el7_2.1          perl-Compress-Raw-Bzip2.x86_64 0:2.061-3.el7         
  perl-Compress-Raw-Zlib.x86_64 1:2.061-4.el7          perl-DBD-MySQL.x86_64 0:4.023-5.el7          perl-DBI.x86_64 0:1.627-4.el7                        
  perl-Env.noarch 0:1.04-2.el7                         perl-GD.x86_64 0:2.49-3.el7                  perl-IO-Compress.noarch 0:2.061-2.el7                
  perl-Net-Daemon.noarch 0:0.48-5.el7                  perl-PlRPC.noarch 0:0.2020-14.el7            perl-Test-Simple.noarch 0:0.98-243.el7               

完毕!
View Code

4. 拷贝初始化参数文件到指定位置并修改配置文件

mv /etc/my.cnf /etc/my.cnf.bak
cp /usr/share/mysql/my-medium.cnf /etc/my.cnf
--参数文件
# Example MariaDB config file for medium systems.
#
# This is for a system with little memory (32M - 64M) where MariaDB plays
# an important part, or systems up to 128M where MariaDB is used together with
# other programs (such as a web server)
#
# MariaDB programs look for option files in a set of
# locations which depend on the deployment platform.
# You can copy this option file to one of those
# locations. For information about these locations, do:
# 'my_print_defaults --help' and see what is printed under
# Default options are read from the following files in the given order:
# More information at: http://dev.mysql.com/doc/mysql/en/option-files.html
#
# In this file, you can use all long options that a program supports.
# If you want to know which options a program supports, run the program
# with the "--help" option.

# The following options will be passed to all MariaDB clients
[client]
#password       = your_password
port            = 3306
socket          = /var/lib/mysql/mysql.sock

# Here follows entries for some specific programs

# The MariaDB server
[mysqld]
port            = 3306
socket          = /var/lib/mysql/mysql.sock
skip-external-locking
key_buffer_size = 16M
max_allowed_packet = 1M
table_open_cache = 64
sort_buffer_size = 512K
net_buffer_length = 8K
read_buffer_size = 256K
read_rnd_buffer_size = 512K
myisam_sort_buffer_size = 8M

# Point the following paths to different dedicated disks
#tmpdir         = /tmp/

# Don't listen on a TCP/IP port at all. This can be a security enhancement,
# if all processes that need to connect to mysqld run on the same host.
# All interaction with mysqld must be made via Unix sockets or named pipes.
# Note that using this option without enabling named pipes on Windows
# (via the "enable-named-pipe" option) will render mysqld useless!
# 
#skip-networking

# Replication Master Server (default)
# binary logging is required for replication
log-bin=mysql-bin
log-bin-index=/var/lib/mysql/binary-log.index

# binary logging format - mixed recommended
binlog_format=row

# required unique id between 1 and 2^32 - 1
# defaults to 1 if master-host is not set
# but will not function as a master if omitted
server-id       = 1

# Replication Slave (comment out master section to use this)
#
# To configure this host as a replication slave, you can choose between
# two methods :
#
# 1) Use the CHANGE MASTER TO command (fully described in our manual) -
#    the syntax is:
#
#    CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>,
#    MASTER_USER=<user>, MASTER_PASSWORD=<password> ;
#
#    where you replace <host>, <user>, <password> by quoted strings and
#    <port> by the master's port number (3306 by default).
#
#    Example:
#
#    CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306,
#    MASTER_USER='joe', MASTER_PASSWORD='secret';
#
# OR
#
# 2) Set the variables below. However, in case you choose this method, then
#    start replication for the first time (even unsuccessfully, for example
#    if you mistyped the password in master-password and the slave fails to
#    connect), the slave will create a master.info file, and any later
#    change in this file to the variables' values below will be ignored and
#    overridden by the content of the master.info file, unless you shutdown
#    the slave server, delete master.info and restart the slaver server.
#    For that reason, you may want to leave the lines below untouched
#    (commented) and instead use CHANGE MASTER TO (see above)
#
# required unique id between 2 and 2^32 - 1
# (and different from the master)
# defaults to 2 if master-host is set
# but will not function as a slave if omitted
#server-id       = 2
#
# The replication master for this slave - required
#master-host     =   <hostname>
#
# The username the slave will use for authentication when connecting
# to the master - required
#master-user     =   <username>
#
# The password the slave will authenticate with when connecting to
# the master - required
#master-password =   <password>
#
# The port the master is listening on.
# optional - defaults to 3306
#master-port     =  <port>
#
# binary logging - not required for slaves, but recommended
#log-bin=mysql-bin

# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = /var/lib/mysql
#innodb_data_file_path = ibdata1:10M:autoextend
#innodb_log_group_home_dir = /var/lib/mysql
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
#innodb_buffer_pool_size = 16M
#innodb_additional_mem_pool_size = 2M
# Set .._log_file_size to 25 % of buffer pool size
#innodb_log_file_size = 5M
#innodb_log_buffer_size = 8M
#innodb_flush_log_at_trx_commit = 1
#innodb_lock_wait_timeout = 50

[mysqldump]
quick
max_allowed_packet = 16M

[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates

[myisamchk]
key_buffer_size = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout
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