Tag: ORA-01157: cannot identify/lock data file 1 – see DBWR trace file

The following errors occur when trying to open a standby database read only:

SQL> alter database open read only;
alter database open read only
*
ERROR at line 1:
ORA-10458: standby database requires recovery
ORA-01157: cannot identify/lock data file 1 - see DBWR trace file
ORA-01110: data file 1: '+DATA2/TESTDB/DATAFILE/system.3203.1186181325'

When checking ASM file for SYSTEM tablespace, the file exists but with different name:

ASMCMD> ls -lt +DATA2/TESTDB/DATAFILE/system*
Type      Redund  Striped  Time             Sys  Name
DATAFILE  UNPROT  COARSE   NOV 30 10:00:00  Y    SYSTEM.577.1186394617

It seems incantation issue from database control file.

SOLUTION

List incarnation:

RMAN> list incarnation;

using target database control file instead of recovery catalog

List of Database Incarnations
DB Key  Inc Key DB Name  DB ID            STATUS  Reset SCN  Reset Time
------- ------- -------- ---------------- --- ---------- ----------
1       1       TESTDB   2969509608       PARENT  1          17-APR-19
2       2       TESTDB   2969509608       PARENT  1920977    27-NOV-24
3       3       TESTDB   2969509608       CURRENT 2848922    29-NOV-24

Rest incarnation:

RMAN> RESET DATABASE TO INCARNATION 2;

database reset to incarnation 2

RMAN>  list incarnation;

using target database control file instead of recovery catalog

List of Database Incarnations
DB Key  Inc Key DB Name  DB ID            STATUS  Reset SCN  Reset Time
------- ------- -------- ---------------- --- ---------- ----------
1       1       TESTDB   2969509608       PARENT  1          17-APR-19
2       2       TESTDB   2969509608       CURRENT 1920977    27-NOV-24
3       3       TESTDB   2969509608       ORPHAN  2848922    29-NOV-24

Then standby database open read only successfully.

SQL>  alter database open read only;

Database altered.