Abstract: In one embodiment, a Database Management System (DBMS) providing increased fault tolerance includes a first DBMS instance communicably coupled with a data store. The DBMS further includes a second DBMS instance communicably coupled with the data store, with the second DBMS instance comprising a shadow instance operable to monitor data processing of the first DBMS instance using a communication facility.

Abstract: Software for reorganizing at least a portion of a database is typically embodied in a computer-readable medium. The portion of the database comprises a plurality of rows stored in a plurality of physical blocks and the rows are categorized by a plurality of reference groups. The example software is operable to identify a target subset of physical blocks based, at least in part, on one of the reference groups and to identify a source subset of physical blocks associated with the particular reference group. The software is further operable to dynamically move the rows stored in a first physical block in the source subset to a second physical block in the target subset while the database is online.