One of the features of ASM is databases consolidation. A single diskgroup will be the repository for multiple databases. The result, having a large number of datafiles. If the files were created using OMF (Oracle Managed Files) format, when the datafile is deleted on the database side, it is also deleted on the ASM side. There may be situations when the datafiles are not deleted on the ASM side, particularly when not using OMF format.
With large diskgroups holding large number of datafiles it is necessary to make good usage of the storage and reclaim space allocated for files not used by the databases.
The following script will provide the list of files stored in ASM and CURRENTLY NOT OPENED by any database client of the diskgroups. It is very important to validate the results of the query, particularly for files that could have been marked temporary offline. It does not apply to READ ONLY tablespaces, because once the file is opened by the database, it will be returned by the query.
Note: The parameter file (spfile) will be reported always as not opened. Always double check the file before deleting it.
Software Requirements/Prerequisites
- The query has to be executed on the ASM instance.
- Diskgroups need to be mounted.
Configuring the Script
None. Download the script and execute on the ASM instance
Running the Script
$ sqlplus '/ as sysdba'
sql>@files_not_opened
Caution
This script is provided for educational purposes only and not supported by Oracle Support Services. It has been tested internally, however, and works as documented. We do not guarantee that it will work for you, so be sure to test it in your environment before relying on it.
Proofread this script before using it! Due to the differences in the way text editors, e-mail packages and operating systems handle text formatting (spaces, tabs and carriage returns), this script may not be in an executable state when you first receive it. Check over the script to ensure that errors of this type are corrected.
Script
The following code can be downloaded here
set pagesize 0set linesize 200col full_alias_path format a80/*+ ---------------------------------------------------------------- Query will return all the files stored on ASM but not currently opened by any database client of the diskgroups ordered by group number, file type ---------------------------------------------------------------*/
select * from (/*+ ----------------------------------------------------------------- 1st branch returns all the files stored on ASM -----------------------------------------------------------------*/select x.gnum,x.filnum,x.full_alias_path,f.ftype from (SELECT gnum,filnum,concat('+'||gname, sys_connect_by_path(aname, '/')) full_alias_pathFROM (SELECT g.name gname, a.parent_index pindex, a.name aname, a.reference_index rindex,a.group_number gnum,a.file_number filnum FROM v$asm_alias a, v$asm_diskgroup g WHERE a.group_number = g.group_number)START WITH (mod(pindex, power(2, 24))) = 0 CONNECT BY PRIOR rindex = pindex) x,(select group_number gnum,file_number filnum, type ftype from v$asm_file order by group_number,file_number) fwhere x.filnum != 4294967295and x.gnum=f.gnum and x.filnum=f.filnumMINUS/*+ -------------------------------------------------------------- 2nd branch returns all the files stored on ASM and currently opened by any database client of the diskgroups -----------------------------------------------------------------*/select x.gnum,x.filnum,x.full_alias_path,f.ftypefrom ( select id1 gnum,id2 filnum from v$lock where type='FA' and (lmode=4 or lmode=2)) l,(SELECT gnum,filnum,concat('+'||gname, sys_connect_by_path(aname, '/')) full_alias_pathFROM (SELECT g.name gname, a.parent_index pindex, a.name aname, a.reference_index rindex,a.group_number gnum,a.file_number filnum FROM v$asm_alias a, v$asm_diskgroup g WHERE a.group_number = g.group_number)START WITH (mod(pindex, power(2, 24))) = 0 CONNECT BY PRIOR rindex = pindex) x,(select group_number gnum,file_number filnum, type ftype from v$asm_file order by group_number,file_number) fwhere x.filnum != 4294967295 andx.gnum=l.gnum and x.filnum=l.filnum and x.gnum=f.gnum and x.filnum=f.filnum) qorder by q.gnum,q.ftype;
The key of this sql is the reference to v$lock view. For any file stored on ASM and opened by a database instance, there will be an entry on v$lock:
Column | Description |
type | The enqueue name is FA (File Access) |
ID1 | For this enqueue, represents the diskgroup number |
ID2 | For this enqueue, represents the ASM file number |
mode | If the file is opened, mode will be 4 (Shared) for 10g, and 2 (row S) for 11g |
| |
The first branch of the main query will return ALL the ASM files stored on the diskgroup
The second branch of the main query will return all the ASM files currently opened by any database.
The query finally will return the files stored on ASM but not present on the second query (MINUS), which basically will be the files not currently opened.
Script Output
This is the first example of the results of the execution of the script. Note it includes all type of files like ARCHIVELOGS, FLASHBACK LOGS, REDOLOGS. Once it has been confirmed the files are not required any more, then they can be deleted using ASMCMD or SQL running the command ALTER DISKGROUP ... DROP FILE '<path>';
GNUM FILNUM FULL_ALIAS_PATH---------- ---------- ---------------------------------------------------------------------- 1 270 +DATA1/G102/ONLINELOG/group_2.270.645209903 1 3247 +DATA1/G102/ARCHIVELOG/2008_01_30/thread_2_seq_54.3247.645369463 1 3249 +DATA1/G102/ARCHIVELOG/2008_01_30/thread_1_seq_59.3249.645367259 1 3250 +DATA1/G102/FLASHBACK/log_104.3250.645367249 1 3251 +DATA1/G102/FLASHBACK/log_103.3251.645369221 1 3252 +DATA1/G102/ARCHIVELOG/2008_01_30/thread_1_seq_58.3252.645367197 1 3254 +DATA1/G102/ARCHIVELOG/2008_01_30/thread_2_seq_53.3254.645369095 1 3255 +DATA1/G102/ARCHIVELOG/2008_01_30/thread_1_seq_57.3255.645366969 1 3256 +DATA1/G102/ARCHIVELOG/2008_01_30/thread_2_seq_52.3256.645368439 1 3257 +DATA1/G102/ARCHIVELOG/2008_02_04/thread_2_seq_59.3257.645786351 1 3258 +DATA1/G102/FLASHBACK/log_13.3258.645786863
As mentioned before, it is extremely important to review the results of the script. In this following example, these datafiles are not currently opened but they belong to a database currently closed.
GNUM FILNUM FULL_ALIAS_PATH---------- ---------- ---------------------------------------------------------------------- 2 256 +DG_NETAPPS/V102/DATAFILE/UNDOTBS2.256.643467013 2 257 +DG_NETAPPS/NETAPP/DATAFILE/SYSTEM.257.643477635 2 258 +DG_NETAPPS/NETAPP/DATAFILE/SYSAUX.258.643477637 2 259 +DG_NETAPPS/NETAPP/DATAFILE/UNDOTBS1.259.643477641 2 260 +DG_NETAPPS/NETAPP/DATAFILE/USERS.260.643477643 2 261 +DG_NETAPPS/NETAPP/CONTROLFILE/Current.261.643478451 2 262 +DG_NETAPPS/NETAPP/ONLINELOG/group_1.262.643478461 2 263 +DG_NETAPPS/NETAPP/ONLINELOG/group_2.263.643478517 2 264 +DG_NETAPPS/NETAPP/ONLINELOG/group_3.264.643478569 2 265 +DG_NETAPPS/NETAPP/TEMPFILE/TEMP.265.643478655 2 266 +DG_NETAPPS/NETAPP/PARAMETERFILE/spfile.266.643478737 2 266 +DG_NETAPPS/NETAPP/spfilenetapp.ora 2 267 +DG_NETAPPS/NETTEST/DATAFILE/UNDOTBS1.267.643723749
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