以下方法經測試，在環境IBM x346,3.2G×2,4G,RAID 1,DB2 V8.2.4,Win2000 Adv Server，DMS表空間中，數據的load速度在60-100萬條/min左右。
背景：需要更改數據庫表空間，或者需要將數據庫中所有表的數據遷移到一個新的數據庫中。
步驟：
1.通過db2控制台(db2cc)選中源數據庫中的所有表，將其導出成DDL腳本；
2.根據需要對腳本進行必要的修改，譬如更改表空間為GATHER；
3.新建數據庫，新建DMS表空間：GATHER；
4.將DDL腳本在此數據庫中執行；
5.編寫代碼查詢源數據庫中的所有表，自動生成export腳本；
6.編寫代碼查詢源數據庫中的所有表，自動生成import腳本；
7.連接源數據庫執行export腳本；
8.連接目標數據庫執行import腳本；
附錄1:生成export腳本代碼示例：
/**
* 創建導出腳本
* @param conn
* @param creator 表創建者
* @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 = " ";
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:
/**
* 創建裝載腳本
* @param conn
* @param creator 表創建者
* @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 = " ";
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
