WebLocks on files and records are made simple, but the lock on the root is still not determined. One way to know about a lock on the root is to search the entire tree. But it nullifies the whole concept of multiple granularity locking schemes. A more efficient way to achieve this is by using a new type of lock called intention mode lock. Web- 1I.GRANULARITY OF LOCKS: The description of a lock mechanism must cover the definition of the lockable objoc-, the operations which can be performed on the objects, …

Multi-granularity Locking in Hierarchies with Synergistic

WebThe size of data items that the data manager locks is called the locking granularity. The data manager could lock at a coarse granularity such as files, at a fine granularity such as records or fields, or at an intermediate granularity such as pages. Each approach has its benefits and liabilities. If it locks at a coarse granularity, the data ... WebLock granularity If one application holds a lock on a database object, another application might not be able to access that object. For this reason, row-level locks, which minimize … novec northern virginia electric cooperative

Lock granularity - IBM

http://jimgray.azurewebsites.net/papers/granularity%20of%20locks%20and%20degrees%20of%20consistency%20rj%201654.pdf WebLock granularity . A programmer working in a multiprocessor environment must decide how many separate locks must be created for shared data. If there is a single lock to serialize the entire set of shared data items, lock contention is comparatively likely. The existence of widely used locks places an upper limit on the throughput of the system. WebSummary of Lock Granularity Implicit lock Desc. lock Anc. lock (DAG) IS (Intention share)None S or IS IX or IS, at least one parent IX (Intention exclusive) None X, SIX, IX, … novec towers