transaction processing/ concurrent transactions interactionsystem resource contentionconcurrency control proceduresdistributed database design system/ C6160B Distributed databases C4250 Database theoryA distributed database system allows concurrent execution of transactions from multiple users at multiple locations. ...
DBMS调研 热度: 11.1并发控制概述 11.2封锁 11.3活锁和死锁 11.4并发调度的可串行性 11.5两段锁协议 11.6封锁的粒度 11.7小结 Transaction begintransaction …… …… commit if(…)rollback 事务 T 1 T 2 T 3 T 1 T 2 T 3 (c)事务的同时并发方式 ...
Much like a concurrent signal assignment, a concurrent assertion statement is a process that gets (re-)activated by an event on any signal present in the assert expression. The difference is that an assertion is neither intended to schedule any new transaction nor capable of doing so. As they...
> If necessary, a (transaction) counter might be used to detect "dirty" reads > (when really incompatible). Don't forget that tables are recorded in a form of B-trees, not as simple heaps (as probably is in some other DBMS). So even if you just append to the table and never dele...
A central electronic complex (CEC)200includes a general purpose programmed digital computer on which programs that form a database management system (DBMS)201execute to provide users204,206with access to a stored database202. In the preferred embodiment, the database is a relational database whose...
TransactionAtomicityIsolationTemporal correctnessUnified modeling languageModel checkingMany database management systems (DBMS) need to ensure atomicity and isolation of transactions for logical data consistency, as well as to guarantee temporal correctness of the executed transactions. Since the mechanisms for...
An active DBMS is expected to support concurrent as well as sequential rule execution in an efficient manner. Nested transaction model is a suitable tool to implement rule execution as it can handle nested rule firing and concurrent rule execution well. In this paper, we describe a concurrent ...
The algorithms allow for inter-transaction caching of data and index pages, so that a page can reside in a client cache even when no transaction is currently active at the client which reduces the number of client-server interactions and offload server resources (CPU and disks), thus improving...
Currently there are some popular solutions preventing incorrect execution of concurrent business processes by using built-in transaction mechanisms and/or resource reservations in database management systems (DBMS). The proposed solution is an alternative, which can be used when resource locking or DBMS...
We shall relate our work on graph-based rule and transaction models to them. The rule subsystems of active DBMSs: POSTGRES [33], Ariel [17], HiPAC [11], Starburst [36] and Alert [1] support prioriti...w11x L. Raschid, A simulation-based study on the concurrent execution of rules...