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 = “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 = “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” db