If a media failure occurs, mirroring provides the database server administrator with a means of recovering data without having to take the database server offline. This feature results in greater reliability and less system downtime. Furthermore, applications can continue to read from and write to a database whose primary chunks are on the affected media, provided that the chunks that mirror this data are located on separate media.
Any critical database should be located in a mirrored dbspace. Above all, the root dbspace, which contains the database server reserved pages, should be mirrored.
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