db2數(shù)據(jù)復(fù)制、遷移方法

以下方法經(jīng)測試，在環(huán)境ibm x346,3.2g×2,4g,raid 1,db2 v8.2.4,win2000 adv server，dms表空間中，數(shù)據(jù)的load速度在60-100萬條/min左右。

背景：需要更改數(shù)據(jù)庫表空間，或者需要將數(shù)據(jù)庫中所有表的數(shù)據(jù)遷移到一個新的數(shù)據(jù)庫中。

步驟：

1.通過db2控制臺(db2cc)選中源數(shù)據(jù)庫中的所有表，將其導(dǎo)出成ddl腳本；

2.根據(jù)需要對腳本進(jìn)行必要的修改，譬如更改表空間為gather；

3.新建數(shù)據(jù)庫，新建dms表空間：gather；

4.將ddl腳本在此數(shù)據(jù)庫中執(zhí)行；

5.編寫代碼查詢源數(shù)據(jù)庫中的所有表，自動生成export腳本；

6.編寫代碼查詢源數(shù)據(jù)庫中的所有表，自動生成import腳本；

7.連接源數(shù)據(jù)庫執(zhí)行export腳本；

8.連接目標(biāo)數(shù)據(jù)庫執(zhí)行import腳本；

附錄1:生成export腳本代碼示例：

/**

* 創(chuàng)建導(dǎo)出腳本

* @param conn

* @param creator　表創(chuàng)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);

}

附錄2:生成import腳本代碼示例:

/**

* 創(chuàng)建裝載腳本

* @param conn

* @param creator　表創(chuàng)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);

}

附錄3:export腳本示例

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

附錄4:import腳本示例

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