db2数据复制、迁移方法
以下方法经测试,在环境ibm x346,3.2g×2,4g,raid 1,db2 v8.2.4,win2000 adv server,dms表空间中,数据的load速度在60-100万条/min左右。
背景:需要更改数据库表空间,或者需要将数据库中所有表的数据迁移到一个新的数据库中。
步骤:
1.通过db2控制台(db2cc)选中源数据库中的所有表,将其导出成ddl脚本;
2.根据需要对脚本进行必要的修改,譬如更改表空间为gather;
3.新建数据库,新建dms表空间:gather;
4.将ddl脚本在此数据库中执行;
5.编写代码查询源数据库中的所有表,自动生成export脚本;
6.编写代码查询源数据库中的所有表,自动生成import脚本;
7.连接源数据库执行export脚本;
8.连接目标数据库执行import脚本;
附录1:生成export脚本代码示例:
/**
* 创建导出脚本
* @param conn
* @param creator 表创建者
* @param filepath
*/
public void createexportfile(connection conn,string creator,string filepath) throws exception {
dbbase dbbase = new dbbase(conn);
string selecttablesql = "select name from sysibm.systables where creator = '" + creator + "' and type='t'";
try {
dbbase.executequery(selecttablesql);
} catch (exception ex) {
throw ex;
} finally {
dbbase.close();
}
dbresult result = dbbase.getselectdbresult();
list list = new arraylist();
while (result.next()) {
string table = result.getstring(1);
list.add(table);
}
stringbuffer sb = new stringbuffer();
string enterflag = "/r/n";
for (int i = 0; i < list.size();i++) {
string tablename = (string)list.get(i);
sb.append("db2 /"export to aa" + string.valueof(i+1)+ ".ixf of ixf select * from " + tablename + "/"");
sb.append(enterflag);
}
string str = sb.tostring();
fileutility.savestringtofile(filepath, str, false);
}
附录2:生成import脚本代码示例:
/**
* 创建装载脚本
* @param conn
* @param creator 表创建者
* @param filepath
*/
public void createloadfile(connection conn,string creator,string filepath) throws exception {
dbbase dbbase = new dbbase(conn);
string selecttablesql = "select name from sysibm.systables where creator = '" + creator + "' and type='t'";
try {
dbbase.executequery(selecttablesql);
} catch (exception ex) {
throw ex;
} finally {
dbbase.close();
}
dbresult result = dbbase.getselectdbresult();
list list = new arraylist();
while (result.next()) {
string table = result.getstring(1);
list.add(table);
}
stringbuffer sb = new stringbuffer();
string enterflag = "/r/n";
for (int i = 0; i < list.size();i++) {
string tablename = (string)list.get(i);
sb.append("db2 /"load from aa" + string.valueof(i+1)+ ".ixf of ixf into " + tablename + " copy no without prompting /"");
sb.append(enterflag);
}
string str = sb.tostring();
fileutility.savestringtofile(filepath, str, false);
}
附录3:export脚本示例
db2 connect to testdb user test password test
db2 "export to aa1.ixf of ixf select * from table1"
db2 "export to aa2.ixf of ixf select * from table2"
db2 connect reset
附录4:import脚本示例
db2 connect to testdb user test password test
db2 "load from aa1.ixf of ixf replace into table1 copy no without prompting "
db2 "load from aa2.ixf of ixf replace into table2 copy no without prompting "
db2 connect reset
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