以下方法經(jīng)測(cè)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(kù)表空間，或者需要將數(shù)據(jù)庫(kù)中所有表的數(shù)據(jù)遷移到一個(gè)新的數(shù)據(jù)庫(kù)中。

步驟：

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

2.根據(jù)需要對(duì)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(kù)，新建DMS表空間：GATHER；

4.將DDL腳本在此數(shù)據(jù)庫(kù)中執(zhí)行；

5.編寫代碼查詢?cè)磾?shù)據(jù)庫(kù)中的所有表，自動(dòng)生成export腳本；

6.編寫代碼查詢?cè)磾?shù)據(jù)庫(kù)中的所有表，自動(dòng)生成import腳本；

7.連接源數(shù)據(jù)庫(kù)執(zhí)行export腳本；

8.連接目標(biāo)數(shù)據(jù)庫(kù)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 = 'rn';

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 = 'rn';

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