-- +----------------------------------------------------------------------------+
-- |                          Jeffrey M. Hunter                                 |
-- |                      jhunter@idevelopment.info                             |
-- |                         www.idevelopment.info                              |
-- |----------------------------------------------------------------------------|
-- |      Copyright (c) 1998-2012 Jeffrey M. Hunter. All rights reserved.       |
-- |----------------------------------------------------------------------------|
-- | DATABASE : Oracle                                                          |
-- | FILE     : asm_drop_files.sql                                              |
-- | CLASS    : Automatic Storage Management                                    |
-- | PURPOSE  : Used to create a SQL script that removes all ASM files          |
-- |            contained within all diskgroups.                                |
-- | NOTE     : As with any code, ensure to test this script in a development   |
-- |            environment before attempting to run it in production.          |
-- +----------------------------------------------------------------------------+

SET ECHO        OFF
SET FEEDBACK    OFF
SET HEADING     OFF
SET LINESIZE    256
SET PAGESIZE    50000
SET TERMOUT     ON
SET TIMING      OFF
SET TRIMOUT     ON
SET TRIMSPOOL   ON
SET VERIFY      OFF

CLEAR COLUMNS
CLEAR BREAKS
CLEAR COMPUTES

COLUMN full_alias_path    FORMAT a255       HEAD 'File Name'
COLUMN disk_group_name    NOPRINT

SELECT
    'ALTER DISKGROUP '  ||
        disk_group_name ||
        ' DROP FILE ''' || CONCAT('+' || disk_group_name, SYS_CONNECT_BY_PATH(alias_name, '/')) || ''';' full_alias_path
FROM
    ( SELECT
          g.name               disk_group_name
        , a.parent_index       pindex
        , a.name               alias_name
        , a.reference_index    rindex
        , f.type               type
      FROM
          v$asm_file f RIGHT OUTER JOIN v$asm_alias     a USING (group_number, file_number)
                                   JOIN v$asm_diskgroup g USING (group_number)
    )
WHERE type IS NOT NULL
START WITH (MOD(pindex, POWER(2, 24))) = 0
    CONNECT BY PRIOR rindex = pindex
/

SET FEEDBACK    6
SET HEAD        ON