file system cache

Although you have jail me into a specific environment through namespace, the processes I use in the CPU, memory, disk, and so on, can actually be arbitrary. So, we want to limit or control the resources used in the process. That's why Linux cgroup

Commercial cloud storage services, such as Amazon S3 and Google Cloud Storage, offer highly available, scalable, and unlimited volume object storage services at affordable prices. To speed up the widespread adoption of these cloud products, these

The Back_log value indicates how many requests can be on the stack within a short time before MySQL temporarily stops answering the new request. Only if you expect to have a lot of connections in a short time, you need to increase it, in other words,

MySQL versions, for the Add index processing is different, there are three main types: (1) Copy table methodThis is the earliest supported way to create an index INNODB. As the name suggests, creating indexes is done through temporary table copies.

Brief introduction Picasso is an open source Android graphics cache library at square, which enables image downloading and caching. Mainly has the following characteristics: In the adapter of the collection and cancellation has not been in the field

Elasticsearch The default installed memory is 1GB, for any real business, this setting is too small. If you are using this default heap memory configuration, your cluster configuration may soon be problematic.There are two ways to modify the

the study of IO amplification in Directio (IO test for reading a file: In Symptom 1, the iops of the Iostat test is more than 100, and the ioPS of the test program test is 50, about half the iostat statistic. The number of IO that the Iostat tests

Nmon analysis of the sheet meaning of the file Sheet name Sheet meaning Sys_summ The system summarizes, the blue line is the CPU occupancy change situation, the pink is the disk IO

A disk physical structure(1) Disc: The disk body of the hard drive is composed of several platters stacked together.When the hard drive is factory, the hard disk manufacturer completes the low-level format (physical format), the role is to divide

German Windows XP system optimization patch is not looked at a lot of Windows XP optimization article, put the system is also toss to die, or old cow pull broken car. Below we are employed to introduce people in detail about Windows XP Comprehensive

Configuration sampleFirst provide a sample of the configuration I used[client] #password=88888888Socket=/data/var/mysql/Mysql.sock [Mysqld_safe] PID-file=/data/var/mysql/mysqld.pid Log-error =/data/local/mysql-5.7. +/log/mysql-error.log [MySQL]

MySQL replication is asynchronous or semi-synchronous. When Master fails, some slave may not receive the latest relay log, which means that each slave may be in a different state. It is trivial to handle these consistency issues manually because you

With the improvement of a large number of default options, MySQL 5.6 has significantly fewer options than the previous version needs tuning. In this article I will describe the configuration items that need to be optimized.InnoDB

First, Binlog Introduction:1. What is Binlog:The Binlog log is used to record all statements that have updated data or that have potentially updated data (for example, a delete that does not match any row). Statements are saved as "events," which

GitHub is a git-based implementation of code hosting. Git is the best version control system available today, and is much more popular than SVN. GitHub is free to use and fast and stable. Even for a paid account, the cost of not exceeding 10 US

Master All Parameters1 Log-bin=mysql-bin1, control whether the master is open Binlog record function;2, binary files preferably placed in a separate directory, which not only convenient optimization, more convenient maintenance.3, renaming the

Binary log role: the main implementation of three important functions: for replication, for recovery, for auditing.Binary Log related parameters:Log_binSetting this parameter means enabling the Binlog feature and specifying the path

MySQL optimization continued:1:show index from TABLE_NAME View indexes usage where cardinality cardinality, that is, the value group index sensitivity, the greater the number of rows that need to be scanned when cardinality, the larger is the

Swap uses: Swap means the swap partition, which is usually what we call virtual memory, which is a partition that is partitioned from the hard disk. When the physical memory is not available,The kernel releases some long-unused programs in the cache

Load is an important indicator of the Linux machine, which intuitively reflects the current state of the machine. If the machine load is too high, then the operation of the machine will be difficult.Linux has a high load, mainly due to CPU use,