may you please match everything.

Match the description with the mechanism commonly used to support high-availability database operations. (Selections are used multiple times.) A software solution for providing almost instantaneous failover with no loss of committed data. A standard feature of most enterprise database server software to provide high availability. Can be used to maintain a single standby database for a corresponding production database (principal database). Used for snapshots, to obtain read-only access to data as it existed at the time when the snapshot was created. In industrial use, this mechanism is run in either synchronous operation in high-safety mode or asynchronous operation in highperformance mode. In high-performance mode, the transactions commit without waiting for the mirror server to write the log to disk, which maximizes performance. In high-safety mode, a transaction is completed only when it is committed on both partners, but this usually reduces the transaction speeds of the database. When a server node fails, this automatically moves control of the shared resources to a working node. The shared disk array is configured to allow all nodes access to the disk resources, but with only one node actively processing data. Comprised of one or more servers (nodes). An architecture that provides redundancy through a configuration in which other servers essentially act as clones of the main production system. This configuration allows seamless failover capabilities in the event of a CPU, memory, or other hardware failure that does not affect storage. Allows two or more database servers to stay "in sync" so that the secondary servers can answer queries and potentially actually change data. If data on the secondary servers is changed, it is merged during synchronization. Can be used to allow "slices" of a database to be cloned between several sites. The "slice" can be a set of database objects (i.e., tables) or even parts of a table, such as only certain specific rows (horizontal slicing) or only certain columns. A technology for making data available offsite and to consolidate data to central sites. Can be used for high availability or for disaster recoverability