原文地址在（http://www.yougemysqldba.com/dis ... &extra=page%3D1）
企業去IOE、或者轉型MySQL，不是一蹴而就的，而是需要長期的積累。只有當企業能夠真正駕馭MySQL時，才會將其作為核心數據庫。在未來很長一段時間，MySQL的比重會不斷的增加、Oracle的比重將會逐漸降低。而在這個時間內，企業經常需要將Oracle中的數據遷移到MySQL中。
目前較出名的有kettle（http://community.pentaho.com/projects/data-integration/），這款工具的核心特點是可視化、支持的數據庫種類多。但是
其缺點也很明顯，安裝包大（接近一個G）、抽取和插入效率不敢恭維。
為了給大家一個額外的選擇，我們提供了一個命令行下的數據遷移工具，專門針對從Oracle到MySQL，效率上要完爆kettle，而且配合一兩行shell腳本，可以輕松
實現多線程。
安裝
操作系統 Centos5、centos6 X64
軟件環境 Oracle instant client軟件包
上傳上述rpm包與二進制包至/usr/local/ora2mysql/，並安裝
oracle-instantclient-basic-10.2.0.4-1.x86_64.rpm（該文件太大，自己去網上下載）
oracle-instantclient-devel-10.2.0.4-1.x86_64.rpm
oracle-instantclient-sqlplus-10.2.0.4-1.x86_64.rpm
libmysqlclient.so.18（該文件太大，自己去網上下載）
oracle-instantclient-devel-10.2.0.4-1.x86_64.rpm (283.04 KB) oracle-instantclient-sqlplus-10.2.0.4-1.x86_64.rpm (766.96 KB) ora2mysql (143.22 KB)
rpm -ivh *.rpm
數據拷貝工具 ora2mysql
上傳到/usr/local/ora2mysql/下
環境變量 修改/etc/profile，在末尾增加如下
export ORACLE_HOME=/usr/lib/oracle/10.2.0.4/client64
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/lib/oracle/10.2.0.4/client64/lib:/usr/local/ora2mysql/
export TNS_ADMIN=/usr/lib/oracle/10.2.0.4/client64
運行 source /ect/profile
運行
1. 進入ora2mysql目錄/usr/local/ora2mysql/下
運行
./ora2mysql
顯示如下
DataCopy: Fast Oracle Data Copy Utility, Release 3.0.1
(c) Copyright Lou Fangxin (AnySQL.net) 2010, all rights reserved.
Support by Wang Guang You(www.yougemysqldba.com) or WeChat(onesoft007)
Usage: ora2mysql keyword=value [,keyword=value,...]
Valid Keywords:
user1 = username/password@host
ort:sid for source database.
user2 = username/password@hostort:database for target database.
table = table name for both source and target.
tables = table name list for both source and target.
table1 = source table name to query data from.
table2 = target table name to insert data into.
query1 = select SQL for source database.
query2 = insert SQL for target database.
read = set DB_FILE_MULTIBLOCK_READ_COUNT at session level
sort = set SORT_AREA_SIZE at session level (UNIT:MB)
hash = set HASH_AREA_SIZE at session level (UNIT:MB)
serial = set _serial_direct_read to TRUE at session level
array = array fetch size
rows = print log information for every given rows.
long = maximum size for long, long raw, CLOB, BLOB columns.
crypt = encrypt the connection info only, no data copy (YES/NO).
parfile = read command option from parameter file
* wait = wait time in microsecond after each array.
* sync = sync mode (INSERT,UPDATE,DELETE,INSUPD,ARRINS,ARRUPD).
* unique = primary key or unique key columns of target table.
* conflict= conflict columns for update on target table.
* filler = filler columns (exclude columns) for target table.
* safe = double column buffer for character set conversion.
* degree = parallelize data copy degree (2-128).
log = log file name for screen messages.
Notes:
ora2mysql user1=scott/tiger user2=scott/tiger table=emp
ora2mysql user1=scott/tiger user2=scott/tiger table1=emp table2=emp_his
2. 根據Oracle表結構生成對應的MySQL表結構。由Oracle DBA和MySQL DBA配合完成。
3. 若兩個表字段數和含義相同，運行如下命令
./ora2mysql user1=<username>/<password>@<host>:<port>:<sid> user2=<username/<password>@<host>:<port>:<database> table=<tablename>
4. 若兩個表字段數或者含義不同，運行如下命令
./ora2mysql user1=<username>/<password>@<host>:<port>:<sid> user2=<username/<password>@<host>:<port>:<database> query1=”select <column> from <table>” query2=”insert into <table>( <column> )”