innodb monitor

: they are optimized by SQL. However, the table and index of the reserved sizes in bytes are accurate. Be particularly careful not to manually add and delete ". frm" files in the InnoDB database: Use the CREATE table and drop TABLE commands. InnoDB has its own internal data Dictionary (database dictionary), if the MySQL ". frm" file and InnoDB internal data dict

InnoDb system architecture and features (Innodb Storage engine Reading Notes summary), innodb Reading Notes Background thread • Master Thread The core background thread is responsible for Asynchronously refreshing the data in the buffer pool to the disk. For example, refresh dirty pages, merge insert buffering, and recycle undo pages. Operations per second: 1. Th

3 possible causes of master-slave inconsistency1. Binlog format is not row2, session-level shutdown Binlog3, manually modify the data in the slaveSet sql_log_bin=0Session level off Binlog, which can lead to master-slave inconsistencyThe kill instance has not stopped for a long time, check the error log and come outKill-9See Show Engine InnoDB status undo is too bigView three tables Innodb_trx, Innodb_locks, innodb_lock_waitsmysql5.7Innodb_status_outpu

recycling.2. IO ThreadAsynchronous IO is used extensively in the InnoDB storage engine to handle write IO requests, and IO Thread is primarily responsible for callbacks for these IO requests.The IO Thread in InnoDB can be observed by command:Mysql>Show engine InnoDB status\g*************************** 1. Row***************************type:innodb name:status:====

MySQL Optimization-InnoDB Optimization-mysql Optimization-innodb Learning Plans are easily interrupted, and persistence is not easy. We have recently held a meeting in the company. To adjust the business direction, we suggest learning NodeJS. I would have done a little before NodeJS, but I have not studied it in depth. The syntax of Node is basically the same as that of client Js. In the past six months, fe

InnoDB started using Linux native AIO (N-AIO later) from 5.5 and said goodbye to the previous simulation method. We will analyze the native AIO architecture of InnoDB from the source code 5.6.10.InnoDB has n Io handler threads (n = 1 ibuf_io_thread + 1 log_io_thread +Innodb_read_io_threads read_io_thread + innodb_write_io_threads write_io_thread), these threads a

One server installs zookeeper and starts, then installs monitor dubbo-monitor-simple-2.8.3 on another server to unzip the installationModifying a configuration fileDubbo.container=log4j,spring,registry,jettyDubbo.application.name=simple-monitorDubbo.application.owner=#dubbo. registry.address=multicast://224.5.6.7:1234dubbo.registry.address=zookeeper://113.52.182.149:54111?backup=113.52.182.150:54111#dubbo.

Reference Manual | Chinese InnoDB chinese reference Manual---Dog dog (heart sail) 1 InnoDB Tables Overview InnoDB provides MySQL with transaction security (commit), rollback (rollback), and crash repair (crash recovery capabilities) (Transaction-safe (ACID compliant ) Type table. InnoDB provides a row lock (locking on

Reference Manual | Chinese InnoDB chinese reference Manual---Dog dog (heart Sail) Translation 2 InnoDB startup options In order to use the InnoDB table in mysql-max-3.23, you must specify the configuration parameters in the [mysqld] section of the configuration file ' my.cnf ' or ' My.ini ' (Windows system). As the minimum setting, in 3.23 You must specify the d

.=====================================2.060717 3:07:56 INNODB MONITOR output3.============================== =======4.per second averages calculated from the last secondsFirst make sure that this is a sample data that is at least 20-30 seconds in statistics. If the average statistic interval is 0 or 1 seconds, then the result is meaningless.Honestly, I don't like the average value provided by

Mysql innodb exception repair experience and innodb experience A set of mysql databases for testing. mysql 5.1.71 in centos6 is used by default. Later I wanted to try Percona server 5.7, because this library does not have any important data. Therefore, no backup was performed before the operation. After the source is configured, the installation is performed directly. The data files are also stored in the d

connections are placed in this cache, and new connections are reused instead of creating new threads.If there are free threads in the cache, MySQL can quickly respond to connection requests without creating a new thread for each connection. Each thread in the cache typically consumes 256KB of memory. Thread CreatedTotal number of threads created for processing connections Mysqltransaction Handler Handler CommitThe number of requests to commit a transaction Handler Rollback

_ row_lock % '; + ------------------------------- + ------- + | Variable_name | value | + ------------------------------- + ------- + | Innodb_row_lock_current_waits | 0 | | Innodb_row_lock_time | 0 | | Innodb_row_lock_time_avg | 0 | | Innodb_row_lock_time_max | 0 | | Innodb_row_lock_waits | 0 | + ------------------------------- + ------- + 5 rows in SET (0.01 Sec) If you find that the lock contention is serious, for example, the values of innodb_row_lock_waits and

Tags: exe No 4.0 moni multi-point KB tuple lag numberA lot of people asked me to explain the output of show INNODB status , to see what the show INNODB status is outputting, and what information we can get from this information to improve MySQL performance. First, let's look at the basics of show INNODB status output, which prints a lot about

monitors for periodic output, InnoDB writes their output to the MYSQLD server standard error output (stderr). In this case, the no output is sent to clients. When switched in, InnoDB monitors print data about every seconds. Server output usually is directed to the error log (see section 5.4.2, "the error log"). This data was useful in performance tuning. On Windows, start the server from a command prompt i

InnoDb architecture and features (Innodb storage engine reading notes) background thread Master Thread The core background thread is responsible for asynchronously refreshing the data in the buffer pool to the disk. For example, refresh dirty pages, merge insert buffering, and recycle undo pages. Operations per second: The log buffer is refreshed to the disk even if the transaction has not been commit

Backup | reference | reference Manual | recovery | data | database | Chinese InnoDB Chinese Reference Manual---canine (heart sail) Translation 6 backup and restore InnoDB database Secure database management is the use of regular data backups. InnoDB Hot Backup is an online backup tool that you can use to perform online backups while the

InnoDB source code reading notes -- buffer pool, innodb source code -- When I first learned about Oracle, there was a concept called SGA and PGA, which is a very important concept. It is actually a buffer pool in the memory. The Design of InnoDB is similar to that of Oracle, and a buffer pool is opened in the memory. As we all know, the difference between the CPU

pages in the innodb_io_capacity buffer pool to disk. Merge 5% innodb_io_capacity Insert buffer. Flushes the log buffer to disk. Delete the useless undo page. If the percentage of dirty pages in the buffer pool exceeds 70%, refresh innodb_io_capacity dirty pages to disk again. Otherwise, refresh 10% innodb_io_capacity dirty pages. Background loop (when the database is idle or the database shuts down): Delete the useless undo page. Merge innodb_io_capacity Insert

Summary of InnoDB foreign key usage and InnoDB Key Usage USE 'wfc _ database'; # ALTER table 'app' ENGINE = INNODB for the master TABLE (also known as the referenced table, referenced TABLE, and outTable; # ALTER table 'app _ version' ENGINE = INNODB from a TABLE (also called a reference table, External TABLE, and refe