Oracle and Transactions
Posted: Tue Jan 28, 2025 3:22 am
The Oracle database
The Oracle database consists of the database files and is located on the disk subsystem of the database server. The Oracle database is also referred to as the passive part. It is generally said that a database is started. However, this is not correct because only the engine, i.e. the instance, can be started, which then interacts with the database.
The Control File
The control file is an important part of the Oracle database. Among other things, it contains the storage locations of the database files. After the instance is started, the control file is located using the CONTROL_FILES initialization parameter in the parameter file and the storage locations of the database files are read. The database files are then connected to the instance (mounted). If the control file is defective or missing, opening the database will fail because the corresponding data files cannot be found.
In addition, the control file is used by the Recovery Manager as a backup catalog, storing all metadata of the backups created with the Recovery afghanistan telegram screening Manager in it. If the control file is irretrievably lost, the database will be difficult to restore. For this reason, mirroring the control files is recommended to prevent loss.
Transactions are an important part of a database that summarizes dependent data changes. This means that these changes cannot be separated from each other and all must be executed successfully. If one or more changes in a transaction are not executed successfully, no other changes in that transaction can be executed either.
The Oracle database consists of the database files and is located on the disk subsystem of the database server. The Oracle database is also referred to as the passive part. It is generally said that a database is started. However, this is not correct because only the engine, i.e. the instance, can be started, which then interacts with the database.
The Control File
The control file is an important part of the Oracle database. Among other things, it contains the storage locations of the database files. After the instance is started, the control file is located using the CONTROL_FILES initialization parameter in the parameter file and the storage locations of the database files are read. The database files are then connected to the instance (mounted). If the control file is defective or missing, opening the database will fail because the corresponding data files cannot be found.
In addition, the control file is used by the Recovery Manager as a backup catalog, storing all metadata of the backups created with the Recovery afghanistan telegram screening Manager in it. If the control file is irretrievably lost, the database will be difficult to restore. For this reason, mirroring the control files is recommended to prevent loss.
Transactions are an important part of a database that summarizes dependent data changes. This means that these changes cannot be separated from each other and all must be executed successfully. If one or more changes in a transaction are not executed successfully, no other changes in that transaction can be executed either.