ORA-27101 is often thrown along with ORA-01034 during database installation. ORA-27101 is also seen after installation is complete, when attempting to use SQL*Plus. To resolve this issue with ORA-27101, you should be sure that ORACLE_HOME and ORACLE_SID are correct, and ORACLE_HOME should not have trailing slash.

What is ora-01034 Oracle not available?

An ORA-01034 error is triggered due to the Oracle system not being available or started up. This could derive from the System Global Area (SGA) necessitating more storage space than what is currently being allocated for your Oracle database. The error could also result during an upgrade of your Oracle systems.

How do I fix Ora 03113 End of communication channel?

The proper fix is to get rid of the recovery files. You do that using RMAN, not SQLPLUS or ADRCI. Wait a long time and your archivelog (that was using up all that space) will be gone. So, you can shutdown/startup your database and be back in business.

How do I resolve ORA 00845 Memorytarget not supported on this system?

If Automatic Memory Management is not supported If Automatic Memory Management and the MEMORY_TARGET parameter are not supported on the target operating system, remove the MEMORY_TARGET parameter from your VDB Configuration Template and use the SGA configuration parameters SGA_TARGET and SGA_MAX_SIZE instead.

What is Ora 03113 end of file on communication channel?

ORA-03113 Error Message End-of-File on Communication Channel. The source of an ORA-03113 is a broken connection between Client and Server process, a blanket end-of-file on a communication channel error. When the error occurs during the process of connecting, it suggests a lost connection that is similar to a timeout.

What is alert log in Oracle?

Alert logs contain important information about error messages and exceptions that occur during database operations. Each Oracle Database for Windows instance has one alert log; information is appended to the file each time you start the instance. All threads can write to the alert log.

How do I fix Ora 01589 must use Resetlogs or Noresetlogs option for database open?

The ORA-01589 error indicates that you have an incomplete recovery and you need to recover the incomplete recovery and then reset the logs before going to open the database. IMPORTANT: Before using the RESETLOGS option you should take an offline RMAN backup of the database.

What is difference between SGA_Target and Memory_target Oracle?

SGA_Target is the size of the SGA not including the PGA. Memory_Target includes both. If the PGA_target + SGA_Target are > Memory_Target, you can get this error.

What is ora-27101 error in Oracle?

The ORA-27101: shared memory realm does not exist will come due to when local shared memory realm is not accessible. You can see more details in oracle documentation where you will find out multiple types of oracle errors in detail. Why ” ORA-27101: shared memory realm does not exist ” is coming?

Why is my shared memory realm not available?

27101, 00000, “shared memory realm does not exist” Unable to locate shared memory realm Verify that the realm is accessible This is usually due to an invalid ORACLE_HOME or ORACLE_SID varaible set at the OS level.

What to do if Oracle_Sid is undefined?

You can view here where or not ORACLE_SID is defined. If you find in either cases that ORACLE_SID is blank or undefined, this may be the cause of ORA_27101. You can then set the ORACLE_SID appropriate for the database to resolve ORA-27101.

How do I correct my Oracle home and Sid values?

Make sure that your ORACLE_HOME and ORACLE_SID are correct To see the current values in windows, at the command prompt type echo %ORACLE_HOME% Then echo %ORACLE_SID% If the values are not your current oracle home and SID you need to correct them. This can be done in Windows environment variables.