Background and actual operation steps of IBM DB2 data replication and migration methods

This article mainly describes the IBM DB2 data replication and migration methods. The following methods have been tested in the Environment IBM x346, 3.2G × 2, 4G, RAID 1, in DB2 V8.2.4, Win2000 Adv Server, and DMS tablespaces, the data load speed is about 60-entries/min.

Background:

You need to change the tablespace of the database, or migrate data from all tables in the database to a new database.

Steps:

1. Select all tables in the source database through the db2 Console (db2cc) and export them as DDL scripts;

2. Make necessary modifications to the script as needed, such as changing the tablespace to GATHER;

3. Create a database and create a DMS tablespace: GATHER;

4. Run the DDL script in this database;

5. write code to query all tables in the source database and generate an export script automatically;

6. write code to query all tables in the source database and generate an import script automatically;

7. Connect to the source database and execute the export script;

8. connect to the target database and execute the import script;

Appendix 1: Sample Code for generating an export script:

/**

* Create an export script

 
 

  
  
* @ Param conn
  
  
* @ Param creator: Table creator
  
  
* @ Param filePath
  
  
*/
  
  
Public void createExportFile (Connection conn, String creator, String filePath) throws Exception {
  
  
DBBase dbBase = new DBBase (conn );
  
  
String selectTableSql = "select name from sysibm. Variables Ables where creator = '" + creator + "' and type = 'T '";
  
  
Try {
  
  
DbBase.exe cuteQuery (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 );
  
  
}
 
 

Appendix 2: Sample Code for generating an import script:

/**

* Create a load script

* @ Param conn

* @ Param creator: Table creator

 
 

  
  
* @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);  
  
  
} 
 
 

Appendix 3: export script example

 
 

  
  
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 
 
 

Appendix 4: import script example

 
 

  
  
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  
  
  
TAG: IBM ibm