read lock

I. OverviewA read-write lock is similar to a mutex, which protects the shared resources of a critical section! The mutex only allows one thread to enter the critical section at a time, and the read-write lock has higher parallelism than it.

InnoDB: Lock & Transaction, innodblock InnoDB is an Engine that supports transactions. To ensure ACID of transactions, you must use Lock. Just like programming in Java, to ensure the thread security of data, the Lock will inevitably be used.

MySQL row-level locks, table-level locks, page-level locks, mysql details Page Level: Engine BDB. Table-level: Engine MyISAM, which is interpreted as locking the entire table. It can be read at the same time but cannot be written at the row level.

One, what is file lockFor the word lock, we must not be unfamiliar, because we live in a large number of locks, they play its role in all aspects of the world, now the function of the lock can be summed up as a sentence, is to prevent some people do

In this section, we describe the lock-related APIs provided in the go language. This includes mutexes and read-write locks. We described the mutex in the 6th chapter, but did not mention the read-write lock. Both of these locks are very common and

In the database (v), within the transaction we speak of the acid property of the transaction, the most important of which can be the repair of the exception and the processing of the concurrent connection.The repair of abnormal condition is mainly

1. Asynchronous I/O modeTypically, when SQLite writes a database file, it waits until the write operation is complete and then controls the return to the calling program. Writing a file system is very time-consuming compared to CPU operation, which

We can understand the rationale behind mysqldump by opening the general log and looking at the commands executed during mysqldump full library backup.Open General Logmysql> set global general_log=on;Where the general log's storage path can be viewed

For MySQL backup, it can be divided into the following two kinds:1. Cold Standby2. Hot standbyAmong them, cold, as the name implies, is to turn off the database, using operating system commands to copy database related files. The hot standby refers

Original address: Mysqldump's single-transaction and Master-data MyownstarsLet's take a look at--lock-tables and--lock-all-tables.--lock-all-tablesLock all tables in all databases at once, acquiring global read lock throughout the dump;This option

I have long heard that the two commands, lock tables and unlock tables, literally know that the function of the former is to lock the table and the latter is to unlock it. But how to use, how to use, not very clear. Today, in a detailed study, we

Talk about high concurrency (28) parsing java.util.concurrent components (10) Understanding Reentrantreadwritelock Read-write lock the basic situation and Main method of Reentrant read-write lock are discussed, Shows how to implement a lock

A lock is a mechanism by which a computer coordinates multiple processes or threads concurrently accessing a resource . In a database, data is a resource shared by many users in addition to contention for traditional computing resources such as CPU,

Java multithreading-Lock/Condition,-lockcondition In java1.5, Lock objects are used to achieve synchronization, which is more convenient to use.Use ReentrantLock for synchronization public class MyService { private Lock lock = new ReentrantLock();

A single Write Program/multiple read programs have been provided in the. Net class library, that is, the System. Threading. ReaderWriterLock class. This article explores multi-thread programming in c # by analyzing a common single write/multiple

Three locking mechanisms of MySQL: bitsCN.com Three locking mechanisms of MySQL The database locking mechanism is a rule designed by the database to ensure data consistency and enable the access of various shared resources to be orderly during

Locktable read lock if a thread obtains the read lock on a table, the thread and all other threads can only read data from the table and cannot perform any write operations. Loc Lock table read lock if a thread obtains the read lock on a table, the

I. Principles of Replication MySQL replication tracks all database changes (updates, deletions, and so on) in binary logs based on the master server ). Each slave server receives updates recorded by the master server to the storage of its binary

If you run the table check/repair program at the same time, you may not want the MySQL server and utility to access a table at the same time. If both programs write data to the table, it will obviously cause a lot of trouble and even cause

This article mainly describes the thread synchronization method in C. There are a lot of online information about the basic concepts of threads. Thread Synchronization is inevitable in multi-threaded applications. In. in the Net Framework, thread