unix lock file

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Comparison of concurrency control (LOCK) between DB2 and Oracle

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

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 SQL Server) are a transaction (Transactions). Transactions are ACID (atomicity, consistency, isolation, and durability) feature. In

DB2 and Oracle concurrency control (lock) comparison _oracle application

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)

"Linux Multi-process sync" record lock __linux

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

Unix/linux inter-process file lock

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

The method of realizing distributed lock in Redis database _redis

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

Analysis of SQLite lock and concurrency control

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

UNIX Environment Advanced Programming: Log Lock (Fcntl function) and deadlock detection

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

File lock-how to lock PHP read files

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

Java Summary--distributed lock

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

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