innodb monitor

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InnoDB Chinese Reference Manual---9 Performance tuning tips

, starting with 3.23.52 and 4.0.3, you can improve the data import speed by closing the foreign key check (FOREIGN key check) in an import session: SET foreign_key_checks=0; Importing to a large table this will reduce the amount of disk I/O. 9.1 InnoDB Monitor (monitors) Starting with version 3.23.42, InnoDB contains the InnoDB monitors, which can show the internal state of the InnoDB. Starting with vers

InnoDB Storage Engine Status parameters

Mysql> Show engine InnoDB status \g1. Row ***************************Type:innodbName:Status:=====================================2015-04-17 10:37:02 7f1fc1fe9700 INNODB MONITOR OUTPUT=====================================Per second averages calculated from the last seconds-----------------BACKGROUND THREAD-----------------Srv_master_thread loops:0 srv_active, 0 srv_shutdown, 562 srv_idleSrv_master_thread Log

Innodb:warning:a Long semaphore Wait Solution

X-lock (WAIT_EX) on Rw-latch at 0x7f4a60043da8 created in file dict0dict.cc line 2341815 a writer (thread ID 139957495039744) has reserved it in mode wait exclusive816 number of readers 2, Waiters flag 1, Lock_word:fffffffffffffffe817 last time read locked in file btr0cur.cc line 554818 last time write locked on file/root/mysql-5.6.10/storage/innobase/btr/btr0cur.cc line 545819 InnoDB: ###### starts InnoDB Monito

View lock information (turn on InnoDB monitoring)

large.Third, the open State monitoringInnoDB Monitoring mechanism currently provides the following four types of monitoring: Standard InnoDB Monitor: monitors the table locks, row locks, transaction lock waits, thread semaphore waits, file IO requests, buffer pool statistics, InnoDB main thread purge and change buffer held by the active transaction; Merge activity. Lock monitoring (InnoDB lock

Show Engine InnoDB Status interpretation

Tags: innodb statusMysql> Show engine InnoDB status\g1. Row ***************************Type:innodbName:Status:=====================================2018-02-24 18:15:52 0x7f2ac00dd700 INNODB MONITOR OUTPUT=====================================Per second averages calculated from the last seconds-----------------BACKGROUND THREAD-----------------Srv_master_thread loops:2 srv_active, 0 srv_shutdown, 23859 srv_idl

A case _mysql in Mysql from library latency Troubleshooting

but not gap record locks Space ID 1002 Page No 6MB n BITS 256 index ' gen_clust_index ' of table xx_db.xxtable Trx ID 1c0c2dfdf lock_mode X locks Rec but not gap record LO Cks Space ID 1002 Page no 6983 n bits 256 index ' gen_clust_index ' of table xx_db.xxtable Trx ID 1C0C2DFDF lock_mode X lock S rec but not gap record LOCKS Space ID 1002 Page no 6987 n bits 256 index ' gen_clust_index ' of table xx_db.xxtable Trx ID 1c0c2dfdf Lock_mode X Locks Rec but not gap record locks Space ID 1002 Page

MYSQL Show engine and other practical command

INNODB MONITOR OUTPUT=====================================Per second averages calculated from the last seconds-----------------BACKGROUND THREAD-----------------Srv_master_thread loops:1 srv_active, 0 srv_shutdown, 488673 srv_idleSrv_master_thread Log Flush and writes:488674----------Semaphores----------OS WAIT ARRAY info:reservation count 2OS WAIT ARRAY info:signal count 2Mutex Spin waits 0, rounds 0, OS

MySQL storage engine-Application

disappears) | | EXAMPLE | NO | Example storage engine | | ARCHIVE | YES | Archive storage engine | | CSV | NO | CSV storage engine | | Ndbcluster | NO | Clustered, fault-tolerant, memory-based tables | | FEDERATED | NO | Federated MySQL storage engine | | MRG_MYISAM | YES | Collection of identical MyISAM tables | | Isam | no | obsolete storage engine | + ------------ + --------- + ---------------------------------------------------------------- + 12 rows in SET (0.00 Sec) The standard installer

REDO parsing in innodb

INNODB MONITOR OUTPUT============================================Per second averages calculated from the last 12 seconds-----------------BACKGROUND THREAD-----------------Srv_master_thread loops: 224 seconds second, 224 sleeps, 18 10_second, 66 background, 66 flushSrv_master_thread log flush and writes: 228----------SEMAPHORES----------OS WAIT ARRAY INFO: reservation count 114, signal count 113Mutex spin w

MySQL Lock monitor

- - the: +: $149c INNODB MONITOR OUTPUT=====================================Per second averages calculated fromThe last0seconds-----------------BACKGROUND THREAD-----------------Srv_master_thread Loops:3Srv_active,0Srv_shutdown,1528929Srv_idlesrv_master_thread log Flush and writes:1528919----------semaphores----------OS WAIT ARRAY info:reservation Count +OS WAIT ARRAY info:signal Count -Mutex Spin Waits142

Show Engine InnoDB Status\g

Mysql> Show engine InnoDB status\g1. Row ***************************Type:innodbName:Status:=====================================131226 17:12:38 INNODB MONITOR OUTPUT=====================================Per second averages calculated from the last seconds----the state of the database in the past 55 seconds-----------------BACKGROUND THREAD-----------------Srv_master_thread loops:372007 1_second, 372007 sleep

Slave memory leak and trigger oom-killer, leakoom-killer

MInnodb_use_sys_malloc = 0Innodb_log_file_size = 8196 MInnodb_log_buffer_size = 64 MInnodb_log_files_in_group = 3Innodb_lock_wait_timeout = 30Innodb_spin_wait_delay = 96Innodb_thread_concurrency = 0Innodb_max_dirty_pages_pct = 75Innodb_support_xa = 0Innodb_flush_log_at_trx_commit = 2Innodb_flush_method = O_DIRECTInnodb_read_io_threads = 16Innodb_write_io_threads = 16Innodb_io_capacity = 2000Innodb_flush_neighbors = 0Innodb_page_size = 4 KInnodb_log_block_size = 4096Innodb_file_per_table = 1Inno

Mysql learning record (20) -- MysqlServer parameter adjustment _ MySQL

I. theory: 1. memory optimization principle: a allocates as much memory as possible to mysql for caching, but reserves enough memory for the operating system and other programs, otherwise, SWAP page switching will be generated, affecting the performance of bMyISAM data file reading relies on the operating system's own IO cache. Therefore, I. theory: 1. memory optimization principles: A. allocate as much memory as possible to mysql for caching, but reserve enough memory for the operating system a

Slave memory leak and trigger Oom-killer_mysql

= 3Innodb_lock_wait_timeout = 30Innodb_spin_wait_delay = 96innodb_thread_concurrency = 0innodb_max_dirty_pages_pct = 75Innodb_support_xa = 0Innodb_flush_log_at_trx_commit = 2Innodb_flush_method = O_directInnodb_read_io_threads = 16Innodb_write_io_threads = 16innodb_io_capacity = 2000innodb_flush_neighbors = 0Innodb_page_size = 4KInnodb_log_block_size = 4096innodb_file_per_table = 1Innodb_file_format = BarracudaInnodb_file_format_max = BarracudaInnodb_strict_mode = 1Innodb_purge_threads = 2Innod

InnoDB Information Description

Tags: author memory read output operation AST inventory OOP databaseInnoDB is the most critical database storage engine ever developed for MySQL database, which not only supports transactional features, but also has rich statistics to make it easy for database managers to understand the state of the recent InnoDB storage engine.Earlier versions of the InnoDB storage engine were implemented by creating a new internal table named Innodb_monitor, and the InnoDB engine-related statistics were timed

How to view the latest transaction ID in msyql

You may need to review the current transaction ID to make some business logic decisions (such as using transaction ID changes and time difference, and counting the response duration for each transaction).Typically, there are two ways to view the current transaction ID:1. Perform show ENGINE INNODB STATUS to view transaction related information=====================================150303 17:16:11 INNODB MONITOR

Be alert to InnoDB and MyISAM Hash index creation traps

engine innodb status to view the current usage of the adaptive hash index: ============================================ 10:51:19 1d68 INNODB MONITOR OUTPUT ============================================ Per second averages calculated from the last 36 seconds ...... ------------------------------------- INSERT BUFFER AND ADAPTIVE HASH INDEX ------------------------------------- Ibuf: size 1, free list len 263

Timed MySQL crash caused by adaptive hash index restart

semaphore: X-lock on RW-latch at 0x7fd9142bfcc8 created in file dict0dict. c line 1838a writer (thread id 140570526021376) has reserved it in mode exclusivenumber of readers 0, waiters flag 1, lock_word: 0 Last time read locked in file btr0cur. c line 535 Last time write locked in file/PBS/build/sb_0-10180689-1378752874.69/storage/innobase/btr/btr0cur. c line 528 ........................ End of innodb monitor

Summary of the latest PHP classic interview topics (next article)

rollback segment). This can be seen through InnoDB monitor; MyISAM Storage Engine: MySQL is the official storage engine, mainly for OLAP (online analytical processing, on-line Analytical Processing) aspects of the application.Characteristics: Transactions are not supported, table and full-text indexes are supported. Fast operation speed; The MyISAM Storage engine table consists of myd and myi,

Special cases of innodb RC lock, innodbrc

Showengine innodb status Trx readview will not see trx with id> = 270882, sees TABLELOCK table 'mytest'. 't4 'trx id 270881 lock mode IX RECORDLOCKS space id 75 page no 3 n bits 72 index 'primary' of table 'mytest'. 't4 'trx id 270881 lock_mode X locks rec but not gap Recordlock, heap no 2 physical record: n_fields 4; compact format; info bits 0 0: len 4; hex 80000001; asc ;; 1: len 6; hex 00000004221c; asc ";; 2: len 7; hex 9a000001530110; asc S ;; 3. len 4; hex 80000001; asc ;; TABLE LOCKta

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