Table of Contents
- 1 What are the types of instance recovery?
- 2 What are the steps involved in instance recovery?
- 3 What happens when EC2 instance fails?
- 4 What is DB instance name?
- 5 How do I know if my EC2 is instance?
- 6 How does Oracle database perform instance recovery automatically?
- 7 What is an instance failure in database recovery?
What are the types of instance recovery?
This chapter discusses three types of recovery: Recovery from Instance Failure. Recovery from Media Failure. Parallel Recovery.
What are the two phases of Oracle database instance recovery?
Instance and crash recovery occur in two phases. In phase one, Oracle applies all committed and uncommitted changes in the redo log files to the affected datablocks. In phase two, Oracle applies information in the rollback segments to undo changes made by uncommitted transactions to the data blocks.
What are the steps involved in instance recovery?
krishna
- krishna. Answered On : May 23rd, 2007.
- Steps involve in recovery1.Restore backup datafiles2.Recover using Archive log files 3.apply partial backup 4.recover using redo log files.
How instance recovery happens in Oracle RAC?
Instance recovery occurs when an instance goes down abruptly, either via a SHUTDOWN ABORT, a killing of a background process, or a crash of a node or the instance itself.
What happens when EC2 instance fails?
EC2 status checks are default for Auto Scaling, if an instance fails these status checks, Auto scaling considers instance unhealthy and replaces it. If ASG has LB or target groups configured, then you can configure ELB health checks as a way to determine instance’s health.
What is difference between instance and database?
While the database includes the application data and metadata stored in physical files on a server, an instance is a combination of the software and memory used to access that data. An Oracle instance can access only one database at a time, while multiple instances can access an Oracle database.
What is DB instance name?
A DB instance is an isolated database environment running in the cloud. It is the basic building block of Amazon RDS. A DB instance can contain multiple user-created databases, and can be accessed using the same client tools and applications you might use to access a standalone database instance.
What is media failure in Oracle?
Media Failure. An error can occur when trying to write or read an file on disk that is required to operate an Oracle database. This occurrence is called media failure because there is a physical problem reading or writing to files on the storage medium.
How do I know if my EC2 is instance?
Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/ . In the navigation pane, choose Instances. Select the instance, choose the Status Checks tab, and choose Actions, Create status check alarm.
How do I know if EC2 instance is rebooted?
Instance reboots initiated from the Amazon EC2 console or through the AWS CLI appear in CloudTrail Events history….To view these events:
- Open the AWS CloudTrail console.
- Choose Event history.
- Select Event name from the filter dropdown list, and then enter RebootInstances.
How does Oracle database perform instance recovery automatically?
Oracle Database performs instance recovery automatically in the following situations: 1 The database opens for the first time after the failure of a single-instance database or all instances of an Oracle RAC… 2 Some but not all instances of an Oracle RAC database fail. Instance recovery is performed automatically by a surviving… More
What is instance recovery?
Instance recovery is the way of bringing back the transactions which are not yet written to the disk by DBWR at the moment of instance failure. Instance failures are possible in multiple ways: hardware issues, power glitches, network outages, abnormal instance shutdowns ( SHUTDOWN ABORT ).
What is an instance failure in database recovery?
Recovery from Instance Failure. Instance failure occurs when a software or hardware problem prevents an instance from continuing work. The following sections describe the recovery performed after failure of instances accessing the database in shared mode.
How does Oracle database start an instance?
When Oracle Database starts an instance, it performs the following basic steps: Searches for a server parameter file in a platform-specific default location and, if not found, for a text initialization parameter file (specifying STARTUP with the SPFILE or PFILE parameters overrides the default behavior)