DBMS Recovery Requirements

Abstract

A DBMS is assumed to be a server providing transaction services, that is, transactions according to the transaction model presented in section A.8 and to the service specification given in section 1.3.1. The standard specification of a transaction service contains the functional specification and the specification of its real-time response interval. A transaction service provided by a DBMS server has pause-crash/omission/performance failure semantics which is a property of DBMS servers. A DBMS server may crash (see section 2.3.2), but will recover into a consistent state and continue to provide transaction services after being recovered. A DBMS server may also omit a transaction by aborting it (see section 2.3.6). Finally, a DBMS server may respond too late, according to the service real-time specification, on some transactions, so that performance failures occur. A transaction service is as a consequence of the specification a soft real-time service.