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When caches are used, the system may introduce the risk of false conflicts due to the use of cache line granularity. [3] Load-link/store-conditional (LL/SC) offered by many RISC processors can be viewed as the most basic transactional memory support; however, LL/SC usually operates on data that is the size of a native machine word, so only ...
Such a transaction is doomed to abort if it ever tries to commit, so this does not violate the consistency condition enforced by the transactional system, but it is possible for this "temporary" inconsistent state to cause a transaction to trigger a fatal exceptional condition such as a segmentation fault or even enter an endless loop, as in ...
Physically, a log is a file listing changes to the database, stored in a stable storage format. If, after a start, the database is found in an inconsistent state or not been shut down properly, the database management system reviews the database logs for uncommitted transactions and rolls back the changes made by these transactions ...
A database transaction symbolizes a unit of work, performed within a database management system (or similar system) against a database, that is treated in a coherent and reliable way independent of other transactions. A transaction generally represents any change in a database. Transactions in a database environment have two main purposes:
Alternatively, the messages may be written to a dedicated logging system or to a log management software, where it is stored in a database or on a different computer system. Specifically, a transaction log is a log of the communications between a system and the users of that system, [2] or a data collection method that automatically captures ...
System configuration can be dynamically reloaded and it provides a cluster facility, allowing two or more instances to be joined in peer-to-peer manner. Enduro/X is written in C and provides native APIs for C/C++. Mavimax provides bindings are provided for Go, Java programming languages. Community provides bindings for Python, PHP and Perl ...
If a crash happens during that later write operation, previously stored log data may be lost. The ping-pong scheme described in Transaction Processing [1] eliminates this problem by alternately writing the contents of said (logical) last page to two different physical pages inside the log file (the actual last page i and its empty successor i+1).
The eXtremeDB high availability edition supports both synchronous (2-safe) and asynchronous (1-safe) database replication, with automatic failover. [9] eXtremeDB Cluster edition provides for shared-nothing database clustering. eXtremeDB also supports distributed query processing, in which the database is partitioned horizontally and the DBMS distributes query processing across multiple servers ...