At the time recovery in standby database if you see error (Version 188.8.131.52)
ORA-01115: IO error reading block from file 201 (block # 11080)
ORA-01110: data file 263: ‘+DATADG/datafile/indx_8m.655.665578’
ORA-15055: unable to connect to ASM instance
ORA-00020: maximum number of processes (100) exceeded
ORA-01115: corruption in asm based datafile of 11g database on a standby database
Steps to resolve issue:
1. Check ASM alert log file alert_+ASM1.log.
2. From ASM instance
sqlplus “/as sysasm”
Increase the number of processes
SQL> alter system set processes=200 scope=spfile;
SQL> alter system set “_allow_cell_smart_scan_attr”=false scope=spfile;
The parameter “_allow_cell_smart_scan_attr” is specific to exadata and in Normal systems with ASM will have this value as True which caused unwanted scans/processes to the ASM disks which caused ORA-20 and slight performance impact.
By setting the value to FALSE in Non-Exadata will work around the issue.
If OCR/Voting disk placed on shared Cluster file system, then bounce the ASM instance to reflect these changes,otherwise bounce the cluster in case OCR/voting disk placed on ASM file system.
I'm 10gR2 RAC Oracle certified professional, working from last 6 year in the field of database.