Oracle 10g SQL Mass rebuild and move the indexes of a specified user

Here is a function that rebuilds or coalesces the indexes of a specified user.If asked to rebuild the indexes then you can supply a table space to move the rebuild indexes into.

The function takes three parameters :

• user_name : The name of the user whose indexes are to be updated
• rebuild_type : Ether C or R to indicate Coalesce or Rebuild operation
• tablespace_name : Optional parameter to indicate where to move the indexes in case of rebuild

The function should be executed by a user with DBA privileges and this code is as follows

create or replace PROCEDURE rebuild_user_indexes( user_name IN VARCHAR2, 
                                rebuild_type IN VARCHAR2, 
                                tablespace_name IN VARCHAR2 DEFAULT NULL) 
AS
  full_index_name VARCHAR2(100);
  index_command VARCHAR2(10);
  sql_str VARCHAR2(100);
  
  total_indexes Integer;
  updated_indexes Integer;
  
  CURSOR get_index_cursor IS
    SELECT index_name, index_type 
    FROM dba_indexes
    WHERE owner = user_name AND
          index_type in ( 
              'BITMAP', 
              'NORMAL', 
              'FUNCTION-BASED NORMAL', 
              'FUNCTION-BASED DOMAIN');
      
BEGIN
  /* check initial parameters */
  IF rebuild_type <> 'R' AND rebuild_type <> 'C' THEN
    raise_application_error( -20999, 'rebuild type should be "C" or "R"');
  ELSIF rebuild_type = 'R' THEN
    index_command := ' Rebuild';
    /* if a rebuild tablespace is also defined */
    IF tablespace_name <> '' THEN
      index_command := index_command || ' tablespace ' || tablespace_name;
    END IF;
  ELSE
    index_command := ' Coalesce';
  END IF;
  
  total_indexes := 0;
  updated_indexes := 0;
  /* get all indexes that belong to the specified user */
  FOR r IN get_index_cursor LOOP
    total_indexes := total_indexes + 1; 
    dbms_output.put_line( total_indexes || ' ' || 
                          r.index_name || ' ' || 
                          r.index_type);

    /* Coalescing works only on normal B-Tree indexes, 
     * while rebuilding works with everything.
     */    
    IF (rebuild_type = 'R') OR 
       (rebuild_type = 'C' AND instr( r.index_type, 'NORMAL') > 0) THEN
      
      full_index_name := user_name || '.' || r.index_name;
      sql_str := 'alter index ' || full_index_name || index_command;
      
      BEGIN
        /* attempt to modify the index */
        EXECUTE IMMEDIATE sql_str;
        updated_indexes := updated_indexes + 1;
      EXCEPTION
        WHEN OTHERS THEN
          /* display the command and the error that occured during index 
           * update 
           */
          dbms_output.put_line( sql_str);
          dbms_output.put_line( sqlcode || ' ' || sqlerrm);
          /* continue working */
          NULL;
      END;
    END IF;
  END LOOP;
    
  /* report results */
  dbms_output.put_line( 'Indexes examined :' || total_indexes);
  dbms_output.put_line( 'Indexes Updated  :' || updated_indexes);
END rebuild_user_indexes; 

Thanks to SQLDeveloper running the function can is as easy as copying and pasting the following in SQLPlus.

DECLARE
  USER_NAME VARCHAR2(200);
  REBUILD_TYPE VARCHAR2(200);
  TABLESPACE_NAME VARCHAR2(200);
BEGIN
  USER_NAME := NULL;       -- add your user here, for example 'HR'
  REBUILD_TYPE := NULL;    -- either 'C' or 'R'
  TABLESPACE_NAME := NULL; -- optional new tablespace name if desired

  REBUILD_USER_INDEXES(
    USER_NAME => USER_NAME,
    REBUILD_TYPE => REBUILD_TYPE,
    TABLESPACE_NAME => TABLESPACE_NAME
  );
END;

Note

The above code provides a very simplistic approach to index rebuilding as it rebuilds all indexes of a user. In order to determine the indexes in your database that would really benefit from rebuilding you need to run the script available from Oracle Metalink Note:122008.1.