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DBMS backup without suspending updates and corresponding recovery using separately stored log and data files

  • US 20040260726A1
  • Filed: 06/19/2003
  • Published: 12/23/2004
  • Est. Priority Date: 06/19/2003
  • Status: Active Grant
First Claim
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1. A database management system comprising:

  • a mainline database system that makes modifications to data in the database management system using a write-ahead logging protocol;

    stores data on a first set of storage volumes and stores log records on a second set of storage volumes;

    restores consistency between the log records and the data during a restart, and while a backup system lock is held by a backup utility, continues updating objects except for suspending actions that change an external file system catalog, suspending writing updates of objects that extend across a storage volume boundary; and

    freezing a REDO log point in checkpoint information while the backup system lock is taken by the backup utility.

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