Distributed Databases: Principles and Systems

2-phase-locking abort algorithm allocation application approach assume attributes catalog centralized databases Chapter checkpoint Codasyl commitment protocol communication Computer Networks concurrency control consider consists coordinator copies corresponding data item database access database management system Database Systems DBMS DBMSs DDBMS deadlock detection DEPT DEPTNUM determining different sites distributed concurrency control distributed database distributed transaction distribution transparency EMPNUM equivalence transformations evaluating example execution failures function global relation global schema horizontal fragmentation implemented join graph locks mechanism method MGRNUM NAME nodes operands operator tree participants partition performed phase possible predicates primitives problem query optimization query processing recovery reduced reference relation EMP relational algebra reliability remote replication request restart result root agent schedule schemata Section selection semi-join serializability shown in Figure SNUM strategy subtransaction SUPPLIER SUPPLY terminal timeout timestamp tion transaction management transformations tuples unary operations update values vertical fragmentation wait write-set