unix lock file

Comparison of concurrency control (LOCK) between DB2 and Oracle Comparison of concurrency control (LOCK) between DB2 and Oracle 1 Introduction The minimal recovery and transaction units in relational databases (DB2, Oracle, Sybase, Informix, and

1 Introduction The minimal recovery and transaction units in relational databases (DB2, Oracle, Sybase, Informix, and SQL Server) are a transaction (Transactions). Transactions are ACID (atomicity, consistency, isolation, and durability) feature. In

1 Introduction In relational databases (Db2,oracle,sybase,informix and SQL Server) the smallest recovery and transaction units are one transaction (transactions), and transactions have acid (atomicity, consistency, isolation, and permanence)

the main reference to the http://blog.csdn.net/anonymalias/article/details/9197641 (anonymalias column) A record lock is an extended type of read-write lock in thread synchronization and can be used to synchronize file reading and writing with a

Transfer from http://www.cnblogs.com/hjslovewcl/archive/2011/03/14/2314333.htmlThere are three different file locks, three of which are "advisory", which means they rely on theCooperation, so it is very important for all programs in a project to

A distributed lock is a very useful primitive in many environments, and it is the only way to share resources between mutually exclusive operations of a process. There are a number of development libraries and blogs that describe how to implement

In SQLite, the lock and concurrency control mechanisms are handled by the PAGER.C module for the implementation of acid (Atomic, consistent, isolated, and durable) features. In a transaction that contains data modifications, the module ensures that

Records lock record Locking Function: When a process is reading or modifying a part of a file, it can prevent other processes from modifying the same file area. BYTE range lock Byte-range locking Second, history Flock function, you can lock the

A large number of files need to be processed. Using a php process will be slow. How to lock a file when a process reads a file. Do not allow other processes to read and directly skip this step. Do you want to continue reading other processes? Rename

1. ConceptThe reason of distributed lock: Single Application single-machine deployment environment, in order to solve multi-threaded concurrency problem, we will use REENTRANTLCOK or synchronized to solve mutual exclusion problem, but the business