Persistence in Databases: Definition, Examples & Importance Two-Phased Locking, Releasing Locks & Deadlocks in Databases ACID Properties in Data Base Management Systems (DBMS) What is a Cursor in SQL? - Example & Syntax Database Security Management7:00 ...
in which modern platforms’ relaxed memory-consistency models mean even seemingly correct programs are in fact wrong. Given this basic definition of what concurrency control is and when it is needed, the chapter then presents a series of guidelines for how to use locks correctly and effectively. ...
The ability to offer concurrency is unique to databases. Spreadsheets or other flat file means of storage are often compared to databases, but they differ in this one important regard. Spreadsheets cannot offer several users the ability to view and work on the different data in the same file, ...
Adata dictionary (DDL) lockprotects the definition of aschema objectwhile an ongoing DDL operation acts on or refers to the object. Only individual schema objects that are modified or referenced are locked during DDL operations. The database never locks the wholedata dictionary. ...
A framework allowing a unified and rigorous definition of the semantics of concurrency is proposed. The mathematical model introduces processes as elements... JWD Bakker,JI Zucker - 《Inform & Control》 被引量: 696发表: 1982年 Proceedings Third Workshop on Programming Language Approaches to Concurr...
The database grows in size and becomes bloated by multiple versions of DBMS records. For the user, or even the developer, the complexity involved to implement MVCC concurrency control methods is completely hidden, as the functionality is provided by the database vendor...
Our interest was first, the analysis of the different conflicts in runtime parallel inter/query processing and second, the definition and the resolution of the transactions conflicts in a logical level. Control rules were integrated in the row scheme to enable logical transformation before any query...
The report, however, is calculated based on a report definition and data input, both of which do not change during the life time of the “report” instance. Even if a concurrent update overwrites another update, the two updates are guaranteed to be identical because they are based on the ...
Synonyms Concurrent spatial operations; Simultaneous spatial operations; Concurrency control protocols; Phantom Update Protection Definition The concurrency control for spatial access method refers to the techniques providing the seriali... D Jing,Chang-tien Lu - Springer US 被引量: 1发表: 0年 GLIP:...
a transaction manager configured to receive a definition of a lock group containing a field in a first class and a field in a second class such that the first class has at least one other field that is not contained by the lock group, configured to receive from a client a request to co...