ORA-00245：
Modify the location of the snapshot control file to the shared disk, execute show snapshot controlfile name; in rman to view it, and execute configure snapshot controlfile name to '+data/****'; in rman to modify it. (Note: If this error is still reported after configuration, execute The database can be solved after restarting srvctl)
ORA-00257：
The archive log is about to be full and non-sys users cannot log in to rman. Use sys user login to clear the logs and execute rman.
delete archivelog all completed before'SYSDATE-7';- crosscheck archivelog all;
- delete expired archivelog all;
ORA-00845：
Insufficient space in /dev/shm, reset the mount point space mount -o remount,size=4G /dev/shm
ORA-00600：internal error code，arguments：[krbbtgb_wait_no_buffers]， [ ]，[ ]，[ ]，[ ]，[ ]，[ ]，[ ]，[ ]，[ ]，[ ]，[ ]
During the rac cluster database backup process, asm does not allocate cache and sqlplus executes
- alter system set "_backup_file_bufcnt"=64 scope=both;
- alter system set "_backup_dynamic_buffers"=false scope=both;
ORA-01654：
The data file capacity has reached the upper limit (default 32G), and you need to manually add a new data file to the table space.
- select name from v$datafile; (View the size of each data file in turn)
- ALTER TABLESPACE "USERS" ADD DATAFILE '/data/oracle/oradata/orcl/users02.dbf' SIZE 32G AUTOEXTEND ON NEXT 50M MAXSIZE UNLIMITED;
ORA-19571：
The archive log was not cleared in time, resulting in the control file not recording the old recid.
Solution: 1. alter system set control_file_record_keep_time=15 scope=spfile;
2、delete archivelog all; crosscheck archivelog all; delete expired archivelog all;
ORA-00020：
The number of session connections exceeds the maximum.
Solution:
1. After restarting the database. Check the parameters show parameter processes; modify the parameters alter system set processes=1000 scope=spfile;
2. If the error is still reported after a period of time after the above modifications, it is most likely caused by the increasing number of OMS service connections. Check the connected process name SELECT MACHINE, PROGRAM, COUNT(*) FROM V$SESSION GROUP BY MACHINE, PROGRAM; ----OMS is Oracle web management service, it does not affect the business, just close the service
- linux method: emctl stop dbconsole
- Windows method: net stop OracleDBConsoleorcl (orcl is the instance name)