Backing Up and Restoring MySQL Data in Software Deploy pdf417 2d barcode in Software Backing Up and Restoring MySQL Data

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Backing Up and Restoring MySQL Data using barcode integrating for software control to generate, create pdf 417 image in software applications. GS1 Bar Codes Center This chapter will cover Software PDF 417 the basic tasks necessary to back up your MySQL data efficiently, and the steps to restore this data if necessary. We will discuss the following recipes:. f f f f f f f f Using MySQL Administrat Software PDF 417 or GUI Tool as a frontend for backups Copying all data files to a backup location Creating a SQL dump of all databases Creating a SQL dump of specific databases Creating a SQL dump of specific tables Compressing SQL dumps on-the-fly Rotating and purging binary logs Using replication to perform backups without hurting a production system"s performance Restoring data from a dump to a previously backed-up state Performing a point-in-time recovery using the binary logs. Backing Up and Restoring MySQL Data Introduction Although MySQL has a re putation for robustness and data loss is a problem you will not likely encounter, it is best to be prepared for when your data gets corrupted or lost. Experience shows that it will eventually happen and probably when you least expect it. The first thing you should make sure of is that you have a backup at hand.

In this chapter, we will show you different ways of saving your data elsewhere. But having a backup alone is not enough, as even the most complete backup is basically useless if you are not able to restore your data from it. This chapter also covers different ways of restoring the data in the database using an existing backup.

You should, however, be aware that a backup strategy does not only consist of the technical details on how to back up and how to restore your data. You should also consider backup aspects like backup frequency, how many generations have to be kept available, suitable backup media, and constructional conditions. Is one backup per week sufficient Or is once a day a better choice Will you need a tape drive, or will a USB hard disk do Is it required to store backup media in a separate fire compartment All these questions will be answered differently depending on your application"s criticality, so there are no best practice proposals.

The only thing that we strongly encourage you to do in all cases is to repeatedly and continuously test your restore process! A restore process that was tested some years ago might not work today for different reasons. One common problem with restore processes is that the documentation is outdated or not available to the people that are responsible for restoring the database ("not available" also includes "they do not know where to find it"). Another standard issue is that there are no precise responsibility definitions the people you think are responsible for restoring the database may neither know of the responsibility nor how to do it.

And the fact that the restore process worked perfectly within the given parameters last year is no guarantee that this is the case today as well (data growth often being the reason for such a difference). Restoring an almost empty database took a matter of minutes back then, but restoring the current multi-terabyte database takes more than 24 hours, which is not acceptable if the backup-restore concept states a maximum recovery time of six hours. So, as with a fire alarm, you should try and test it on a regular basis to make sure the whole process still works as expected, and hope that you will never need it.

While definition of a full backup-recovery strategy is beyond the scope of this chapter, we will provide you with the basic technical means of saving and restoring your database.. 4 . Using MySQL Administrator GUI Tool as a frontend for backups Getting ready To follow the steps in this recipe, you will need an account that has sufficient permissions to perform a backup (you will need SELECT and LOCK TABLES privileges). We will assume a user named backup_usr (refer to 8, Defining a specific user for backup). You should also make sure that there is no write access to your database.

This is to prevent locking issues. For further explanation please refer to the There"s more..

. section. And finally, you will need sufficient space on one of your drives to store the backup file.

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