The principle of data backup and recovery of Informix database

The principle of data backup and recovery of Informix database Informix is a relational database management system that provides data backup and recovery functions to ensure the security and reliability of data.Data backup is to copy the data in the database to another location or device so that the data can be restored when accident failure or data is lost.Recovery refers to the process of using the database to recover the data by using a backup data after the occurrence of data loss or accident failure. The principle of data backup and recovery of the Informix database includes the following steps: 1. Create backup files: First, you need to create files for storing database backup.The backup file can be located on a local disk or a remote position (such as a network sharing folder).In order to avoid data damage risk, it is recommended to store backup files on a physical separation device. 2. Define the backup type: Informix database provides multiple backup type options.For example, FULL BACKUP backups the entire database into the backup file; incremental backup only backup the data changed since the last backup; log backup backup database transaction log can be able to use the backup file logs.Restore to a certain time point. 3. Perform backup: Use the backup command or tool provided by Informix to perform the corresponding backup operation.According to the selected backup type, complete backup, incremental backup, or log backup can be performed. Here are examples of using the Informix backup command (ONTAPE) to complete a complete backup: ontape -s -L 0 The command will start a completely backup and store the backup data in a predefined backup file. 4. Data recovery: After data damage or failure, the data recovery operation needs to be performed to restore the database.The process of data recovery is related to the type of backup. If you execute a complete backup, you can restore the database by executing the following command: ontape -r The command will use the latest complete backup file to restore the database to the status of the backup. If you execute incremental backup or log backup, you can use the following commands for incremental recovery: ontape -r -L 0 The command will be recovered in an incremental increase according to the backup file and log file, and the database is restored to the state of the specified time point. When performing backup and recovery operations, you need to pay attention to configuration related parameters to ensure the correctness and reliability of the operation.For example, the location, size and quantity of the backup file can be configured, and the preservation time and size limit of the log file.In addition, a regular backup plan can be set to automatically perform backup operations. In short, the principle of data backup and recovery of the Informix database includes creating backup files, defining backup types, execution backup and data recovery.Understanding and mastering these principles is essential to ensure the safety and availability of the database.