Dog eat Dog… Oracle deletes itself by mistake!

While implementing the backup on a new DB inherited from a customer, I scheduled our standard backup “type disk” procedure through rman, on Windows.
The morning after I saw that the “delete obsolete” tried to delete ALL CURRENT DATAFILES!!

i criteri di conservazione RMAN verranno applicati al comando
i criteri di conservazione RMAN sono impostati su una ridondanza 1
canale allocato: ORA_DISK_1
canale ORA_DISK_1: sid=29 devtype=DISK
Eliminazione dei seguenti backup e copie obsoleti:
Tipo Chiave Ora fine Nome file/Handle
-------------------- ------ ------------------ --------------------
Set di backup 917 28-GIU-11
Set di backup 927 29-GIU-11
Backup piece 1005 29-GIU-11 H:\ORACLE\BACKUP\ORAPERSP\RMAN\SPFILEBCK_20110629
Copia file di dati 14 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\INDX01.DBF
Copia file di dati 16 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\TOOLS01.DBF
Copia file di dati 17 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\USERS01.DBF
Copia file di dati 18 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\DRSYS01.DBF
Copia file di dati 19 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\EXAMPLE01.DBF
Copia file di dati 20 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\ODM01.DBF
Copia file di dati 21 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\XDB01.DBF
Copia file di dati 22 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\CWMLITE01.DBF
Copia file di dati 23 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\TBLDATI01.ORA
Copia file di dati 26 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\SYSTEM01.DBF
Copia file di dati 27 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\UNDOTBS01.DBF
backup piece eliminata
backup piece eliminata
handle di backup piece=H:\ORACLE\BACKUP\ORAPERSP\RMAN\C-2220366420-20110628-02 recid=990 stamp=755031582
backup piece eliminata
handle di backup piece=H:\ORACLE\BACKUP\ORAPERSP\RMAN\C-2220366420-20110629-00 recid=1002 stamp=755130872
backup piece eliminata
handle di backup piece=H:\ORACLE\BACKUP\ORAPERSP\RMAN\CTL_20110629 recid=1004 stamp=755130883
backup piece eliminata
handle di backup piece=H:\ORACLE\BACKUP\ORAPERSP\RMAN\SPFILEBCK_20110629 recid=1005 stamp=755130885
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of delete command on ORA_DISK_1 channel at 06/29/2011 22:34:55
ORA-19584: file E:\ORACLE\ORADATA\ORAPERSP\INDX01.DBF già in usoRecovery Manager ha terminato.

That’s because all current datafiles were registered into recovery catalog as backup copy. With a recovery redundancy of 1, all datafiles were set as obsolete! But since it’s windows, a delete command doesn’t delete datafiles if they are already in use. What it was on unix? We had just luck!

Then we had to uncatalog all copies.

RMAN> list copy;

la specifica non corrisponde a nessuno dei log di archivio del Recovery Catalog

Lista di copie del file di dati
Chiave SCN Ckp file S Ora di completamento Nome Ora ckp
------- ---- - -------------------- ---------- -------------------- ----
26 1 X 29-NOV-10 18535127593 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\SYSTEM01.DBF
27 2 X 29-NOV-10 18535127762 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\UNDOTBS01.DBF
14 3 X 29-NOV-10 18535122625 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\INDX01.DBF
16 4 X 29-NOV-10 18535123721 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\TOOLS01.DBF
17 5 X 29-NOV-10 18535124423 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\USERS01.DBF
18 6 X 29-NOV-10 18535124439 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\DRSYS01.DBF
19 7 X 29-NOV-10 18535124453 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\EXAMPLE01.DBF
20 8 X 29-NOV-10 18535124554 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\ODM01.DBF
21 9 X 29-NOV-10 18535125790 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\XDB01.DBF
22 10 X 29-NOV-10 18535125874 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\CWMLITE01.DBF
23 11 X 29-NOV-10 18535125887 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\TBLDATI01.ORA
24 12 X 29-NOV-10 18535126750 29-NOV-10 E:\ORACLE\ORADATA\ORAPERSP\TBLINDEX01.ORA

RMAN> change copy of datafile 1..N uncatalog;

copia non catalogata del file di dati
filename di copia del file di dati=E:\ORACLE\ORADATA\ORAPERSP\INDX01.DBF recid=14 stamp=736336991
Oggetti 1 non catalogati

until no “obsolete” current datafile were reported!

RMAN> report obsolete;

i criteri di conservazione RMAN verranno applicati al comando
i criteri di conservazione RMAN sono impostati su una ridondanza 1
non sono stati trovati backup obsoleti

Lesson learned: never schedule delete obsolete without actually checking what could be deleted!

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Principal Product Manager at Oracle
Ludovico is a member of the Oracle Database High Availability (HA), Scalability & Maximum Availability Architecture (MAA) Product Management team in Oracle. He focuses on Oracle Data Guard, Flashback technologies, and Cloud MAA.

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