Synch computers
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14.17.2 Monitoring InnoDB Mutex Waits Using Performance Schema A mutex is a synchronization mechanism used in the code to enforce that only one thread at a given time can have access to a common resource. When two or more threads executing in the server need to access the same resource, the threads compete against each other. The first thread to obtain a lock on the mutex causes the other threads to wait until the lock is released. For InnoDB mutexes that are instrumented, mutex waits can be monitored using Performance Schema. Wait event data collected in Performance Schema tables can help identify mutexes with the most waits or the greatest total wait time, for example. The following example demonstrates how to enable InnoDB mutex wait instruments, how to enable associated consumers, and how to query wait event data. To view available InnoDB mutex wait instruments, query the Performance Schema setup_instruments table, as shown below. All InnoDB mutex wait instruments are disabled by default. mysql> SELECT * FROM performance_schema.setup_instruments WHERE NAME LIKE '%wait/synch/mutex/innodb%';+-------------------------------------------------------+---------+-------+| NAME | ENABLED | TIMED |+-------------------------------------------------------+---------+-------+| wait/synch/mutex/innodb/commit_cond_mutex | NO | NO || wait/synch/mutex/innodb/innobase_share_mutex | NO | NO || wait/synch/mutex/innodb/autoinc_mutex | NO | NO || wait/synch/mutex/innodb/buf_pool_mutex | NO | NO || wait/synch/mutex/innodb/buf_pool_zip_mutex | NO | NO || wait/synch/mutex/innodb/cache_last_read_mutex | NO | NO || wait/synch/mutex/innodb/dict_foreign_err_mutex | NO | NO || wait/synch/mutex/innodb/dict_sys_mutex | NO | NO || wait/synch/mutex/innodb/recalc_pool_mutex | NO | NO || wait/synch/mutex/innodb/file_format_max_mutex | NO | NO || wait/synch/mutex/innodb/fil_system_mutex | NO | NO || wait/synch/mutex/innodb/flush_list_mutex | NO | NO || wait/synch/mutex/innodb/fts_bg_threads_mutex | NO | NO || wait/synch/mutex/innodb/fts_delete_mutex | NO | NO || wait/synch/mutex/innodb/fts_optimize_mutex | NO | NO || wait/synch/mutex/innodb/fts_doc_id_mutex | NO | NO || wait/synch/mutex/innodb/log_flush_order_mutex | NO | NO || wait/synch/mutex/innodb/hash_table_mutex | NO | NO || wait/synch/mutex/innodb/ibuf_bitmap_mutex | NO | NO || wait/synch/mutex/innodb/ibuf_mutex | NO | NO || wait/synch/mutex/innodb/ibuf_pessimistic_insert_mutex | NO | NO || wait/synch/mutex/innodb/log_sys_mutex | NO | NO || wait/synch/mutex/innodb/page_zip_stat_per_index_mutex | NO | NO || wait/synch/mutex/innodb/purge_sys_pq_mutex | NO | NO || wait/synch/mutex/innodb/recv_sys_mutex | NO | NO || wait/synch/mutex/innodb/recv_writer_mutex | NO | NO || wait/synch/mutex/innodb/redo_rseg_mutex | NO | NO || wait/synch/mutex/innodb/noredo_rseg_mutex | NO | NO || wait/synch/mutex/innodb/rw_lock_list_mutex | NO | NO || wait/synch/mutex/innodb/rw_lock_mutex | NO | NO || wait/synch/mutex/innodb/srv_dict_tmpfile_mutex | NO | NO || wait/synch/mutex/innodb/srv_innodb_monitor_mutex | NO | NO || wait/synch/mutex/innodb/srv_misc_tmpfile_mutex | NO | NO || wait/synch/mutex/innodb/srv_monitor_file_mutex | NO | NO || wait/synch/mutex/innodb/buf_dblwr_mutex | NO | NO || wait/synch/mutex/innodb/trx_undo_mutex | NO | NO || wait/synch/mutex/innodb/trx_pool_mutex | NO | NO || wait/synch/mutex/innodb/trx_pool_manager_mutex | NO | NO || wait/synch/mutex/innodb/srv_sys_mutex | NO | NO || wait/synch/mutex/innodb/lock_mutex | NO | NO || wait/synch/mutex/innodb/lock_wait_mutex | NO | NO || wait/synch/mutex/innodb/trx_mutex | NO | NO || wait/synch/mutex/innodb/srv_threads_mutex | NO | NO || wait/synch/mutex/innodb/rtr_active_mutex | NO | NO || wait/synch/mutex/innodb/rtr_match_mutex | NO | NO || wait/synch/mutex/innodb/rtr_path_mutex | NO | NO || wait/synch/mutex/innodb/rtr_ssn_mutex | NO | NO || wait/synch/mutex/innodb/trx_sys_mutex | NO | NO || wait/synch/mutex/innodb/zip_pad_mutex | NO | NO |+-------------------------------------------------------+---------+-------+49 rows in set (0.02 sec) Some InnoDB mutex instances are created at server startup and are only instrumented if the associated instrument is also enabled at server startup.
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Is presented in descending order, by the number of summarized wait events (COUNT_STAR). You can adjust the ORDER BY clause to order the data by total wait time. mysql> SELECT EVENT_NAME, COUNT_STAR, SUM_TIMER_WAIT/1000000000 SUM_TIMER_WAIT_MS FROM performance_schema.events_waits_summary_global_by_event_name WHERE SUM_TIMER_WAIT > 0 AND EVENT_NAME LIKE 'wait/synch/mutex/innodb/%' ORDER BY COUNT_STAR DESC;+--------------------------------------------------+------------+-------------------+| EVENT_NAME | COUNT_STAR | SUM_TIMER_WAIT_MS |+--------------------------------------------------+------------+-------------------+| wait/synch/mutex/innodb/os_mutex | 78831 | 10.3283 || wait/synch/mutex/innodb/log_sys_mutex | 41488 | 6510.3233 || wait/synch/mutex/innodb/trx_sys_mutex | 29770 | 1107.9687 || wait/synch/mutex/innodb/lock_mutex | 24212 | 104.0724 || wait/synch/mutex/innodb/trx_mutex | 22756 | 1.9421 || wait/synch/mutex/innodb/rseg_mutex | 20333 | 3.6220 || wait/synch/mutex/innodb/dict_sys_mutex | 13422 | 2.2284 || wait/synch/mutex/innodb/mutex_list_mutex | 12694 | 344.1164 || wait/synch/mutex/innodb/fil_system_mutex | 9208 | 0.9542 || wait/synch/mutex/innodb/rw_lock_list_mutex | 8304 | 0.1794 || wait/synch/mutex/innodb/trx_undo_mutex | 6190 | 0.6801 || wait/synch/mutex/innodb/buf_pool_mutex | 2869 | 29.4623 || wait/synch/mutex/innodb/innobase_share_mutex | 2005 | 0.1349 || wait/synch/mutex/innodb/flush_list_mutex | 1274 | 0.1300 || wait/synch/mutex/innodb/file_format_max_mutex | 1016 | 0.0469 || wait/synch/mutex/innodb/purge_sys_bh_mutex | 1004 | 0.0326 || wait/synch/mutex/innodb/buf_dblwr_mutex | 640 | 0.0437 || wait/synch/mutex/innodb/log_flush_order_mutex | 437 | 0.0510 || wait/synch/mutex/innodb/recv_sys_mutex | 394 | 0.0202 || wait/synch/mutex/innodb/srv_sys_mutex | 169 | 0.5259 || wait/synch/mutex/innodb/lock_wait_mutex | 154 | 0.1172 || wait/synch/mutex/innodb/ibuf_mutex | 9 | 0.0027 || wait/synch/mutex/innodb/srv_innodb_monitor_mutex | 2 | 0.0009 || wait/synch/mutex/innodb/ut_list_mutex | 1 | 0.0001 || wait/synch/mutex/innodb/recv_writer_mutex | 1 | 0.0005 |+--------------------------------------------------+------------+-------------------+25 rows in set (0.01 sec)Note The preceding result set includes wait event data produced during the startup process. To exclude this data, you can truncate the events_waits_summary_global_by_event_name table immediately after startup and before running your workload. However, the truncate operation itself may produce a negligible amount wait event data. mysql> TRUNCATE performance_schema.events_waits_summary_global_by_event_name;Garrison Computer Services :: Products :: fmSQL Synch
About Bonjour Bonjour is a networking application extensively used today by Apple to manage commonly used services for device discovery, service discovery, address assignment, and hostname resolution. Built on top of a zero-configuration networking framework, Bonjour for PC is still to this day used to manage Apple-compatible devices such as phones, tablets, computers, printers, and other devices over local networks using multicast Domain Name System (mDNS) service records. PC users can also gain great use from this app because it offers great service to users who want to regularly communicate with Apple devices. For example, every time the iTunes app wants to synch with the iPhone or iPad, it uses Apple Bonjour to discover the device, establishes a secu... Read More » Why choose FileHorse?SecureSecurely download files from our super-fast and secure dedicated linux serversSafeThis product is 100% safe has been successfully scanned with more than 71 antivirus programsTrustedWe serve all files as they were released. We do not use bundlers or download-managers. I have 3 computers in the church 2 synch fine all win 8.1 but my display computer will not synch. How to synch my computer and phone. How to synch a calendar with a smartphone. How to sync two phones. How to sync my Mac with other devices. Synch is easyGarrison Computer Services :: fmSQL Synch :: Installation
| 686322 || 87 | wait/synch/mutex/mysys/THR_LOCK_malloc | 320535 || 88 | wait/synch/mutex/mysys/THR_LOCK_malloc | 339390 || 89 | wait/synch/mutex/mysys/THR_LOCK_malloc | 377100 || 90 | wait/synch/mutex/sql/LOCK_plugin | 614673 || 91 | wait/synch/mutex/sql/LOCK_open | 659925 || 92 | wait/synch/mutex/sql/THD::LOCK_thd_data | 494001 || 93 | wait/synch/mutex/mysys/THR_LOCK_malloc | 222489 || 94 | wait/synch/mutex/mysys/THR_LOCK_malloc | 214947 || 95 | wait/synch/mutex/mysys/LOCK_alarm | 312993 |+----------+-----------------------------------------+------------+ As new events are added to a history table, older events are discarded if the table is full. Summary tables provide aggregated information for all events over time. The tables in this group summarize event data in different ways. To see which instruments have been executed the most times or have taken the most wait time, sort the events_waits_summary_global_by_event_name table on the COUNT_STAR or SUM_TIMER_WAIT column, which correspond to a COUNT(*) or SUM(TIMER_WAIT) value, respectively, calculated over all events: mysql> SELECT EVENT_NAME, COUNT_STAR FROM performance_schema.events_waits_summary_global_by_event_name ORDER BY COUNT_STAR DESC LIMIT 10;+---------------------------------------------------+------------+| EVENT_NAME | COUNT_STAR |+---------------------------------------------------+------------+| wait/synch/mutex/mysys/THR_LOCK_malloc | 6419 || wait/io/file/sql/FRM | 452 || wait/synch/mutex/sql/LOCK_plugin | 337 || wait/synch/mutex/mysys/THR_LOCK_open | 187 || wait/synch/mutex/mysys/LOCK_alarm | 147 || wait/synch/mutex/sql/THD::LOCK_thd_data | 115 || wait/io/file/myisam/kfile | 102 || wait/synch/mutex/sql/LOCK_global_system_variables | 89 || wait/synch/mutex/mysys/THR_LOCK::mutex | 89 || wait/synch/mutex/sql/LOCK_open | 88 |+---------------------------------------------------+------------+mysql> SELECT EVENT_NAME, SUM_TIMER_WAIT FROM performance_schema.events_waits_summary_global_by_event_name ORDER BY SUM_TIMER_WAIT DESC LIMIT 10;+----------------------------------------+----------------+| EVENT_NAME | SUM_TIMER_WAIT |+----------------------------------------+----------------+| wait/io/file/sql/MYSQL_LOG | 1599816582 || wait/synch/mutex/mysys/THR_LOCK_malloc | 1530083250 || wait/io/file/sql/binlog_index | 1385291934 || wait/io/file/sql/FRM | 1292823243 || wait/io/file/myisam/kfile | 411193611 || wait/io/file/myisam/dfile | 322401645 || wait/synch/mutex/mysys/LOCK_alarm | 145126935 || wait/io/file/sql/casetest | 104324715 || wait/synch/mutex/sql/LOCK_plugin | 86027823 || wait/io/file/sql/pid | 72591750 |+----------------------------------------+----------------+ These results show that the THR_LOCK_malloc mutex is “hot,” both in terms of how often it is used and amount of time that threads wait attempting to acquire it.Note The THR_LOCK_malloc mutex is used only in debug builds. In production builds it is not hot because it is nonexistent. Instance tables document whatGarrison Computer Services :: fmSQL Synch :: Setup
FOR IMMEDIATE RELEASEGARRISON COMPUTER SERVICES ANNOUNCES UPDATED FMSQL SYNCH V1.0.1 FORREPLICATED AND DISTRIBUTED DATABASESSynchronize FileMaker and SQL (web) databases on field-by-field basisSYDNEY, Aust. – April 6, 2005 – Garrison Computer Services today announcedan update of fmSQL Synch, a replication and synchronizing utility whichupdates records in both a FileMaker and SQL database. Available for Mac OS9 and Mac OS X, fmSQL Synch employs AppleEvents and JDBC to exchange databetween FileMaker and SQL databases.Existing databases can be configured for synchronizing with just a fewmodifications. fmSQL Synch can also be used to migrate data to/fromFileMaker and SQL databases.Two-way synchronizing will update data from both FileMaker and SQLdatabases. Synchronizing includes updating changed records as well asadding or deleting records. Any record changes made in the FileMakerdatabases are replicated in the SQL database and vice-versa.fmSQL Synch employs field-level conflict checking and resolution. Changesto records in both databases are compared on a field-by-field basis. Anyrecords that have been modified on both FileMaker and SQL database sincethe last synchronization will have all change conflicts logged so the usercan choose which data to keep.fmSQL Synch has been designed to be easy to use. The setup assistant willwalk the user through the required configuration steps, including settingup the JDBC connection details and choosing which fields to use from eachtable.Easily integrate existing FileMaker solutions with a few extramodifications to any existing databases. Once modified the user can usefmSQL Synch to synchronize FileMaker and SQL databases and control allsynching conflicts.After selecting which fields to synchronize in the SQL tables, the user canhave fmSQL Synch create all the SQL statements automatically. The user caneven let fmSQL Synch create the SQL tables which also makes it useful as atool for FM to SQL migration.“Companies have found cost savings in using a separate web database and arelooking for ways to exchange data with both their web database and theirin-house database” said Charlie Garrison, founder of Garrison ComputerServices. “fmSQL Synch was developed to make that data exchange easy andreliable.”“The updated fmSQL Synch app worked flawlessly today. Tried couple of timesas I did before, I can not break the synchronization. Besides my testings,the fmSQL Synch synchronization has kept pace with our Production usersthroughout the day. Needless to say, I am ecstatic.”–Henry Chang, Pentagon TechnologiesCHANGES IN LATEST VERSIONfmSQL Synch v1.0.1 has a few new features as well as some bug fixes:– Added DEBUG logging to assist with finding ‘set data’ errors– Added support for varying SQL date formats (eg. mySQL, MS SQL, etc)– Bug fixes & additional support for US vs int’l date formats– Change IDParent in MergeConflicts and DeleteLog from type ‘number’ to ‘text’– Updated documentationPRICING AND AVAILABILITYfmSQL Synch is available now in two versions; with and without a license forSQL Plugin. The bundle with a license for the SQL Plugin is on special untilMay 15.– fmSQL Synch, single-user US$129– fmSQL Synch with SQL Plugin, single-user US$149To download a demo or for purchasing options, please visit the company’s website at send email [email protected], or call +61 2 4575 5247.REQUIREMENTS– OS9 or OSX 10.2 or later– FileMakerGarrison Computer Services :: fmSQL Synch :: Introduction
Pro v4 or later (not compatible with FMv7 until fmSQL Synch v2)– SQL Plugin v2.1.2 or later– JDBC driver for the SQL databaseNote: fmSQL Synch v2 is fully compatible with FMv7. Version 2 is in finalbeta testing and a public beta will be released in a few weeks.The SQL Plugin from Rumora Automatisering en Advies is required. The latestversion (at this time) is SQL Plugin 2.1.4. The plugin is commercialsoftware but a demo version is available for testing fmSQL Synch. A democopy of the plugin is included in the fmSQL Synch package. A version offmSQL Synch bundled with SQL Plugin is available.A JDBC driver for the SQL database is also required. fmSQL Synch has beendeveloped for use with mySQL but any database which has a JDBC drivershould work. The latest version (at this time) is MySQL Connector/J 3.0.15.The driver is free to download and its use is licensed under the GPL. ThemySQL driver has been included in the fmSQL Synch package for convenience.ABOUT GARRISON COMPUTER SERVICESGarrison Computer Services develops web applications and database solutionsfor small to medium sized businesses. The company has specialized inautomating Macintosh software and systems since 1987. Other products fromthe company include Make Tracks, a customizable FileMaker template formarketing and customer service databases, and Email Archiver, a tool forkeeping the size of mailboxes to a reasonable limit. For more information,please visit the company’s web site at sendemail to [email protected], or call +61 2 4575 5247.Garrison Computer Services :: fmSQL Synch :: FAQ
Desktop Enhancements / Misc. ThemesPublisher: iPod Touch Kopen, License: Freeware, Price: USD $0.00, File Size: 1.9 MBPlatform: Windows iTunes DB Cloner is a tool that allows you to synch your iPhone/iPod Touch or iPod nano with two or more computers. iTunes DB Cloner is a tool that allows you to synch your iPhone/Ipod Touch or Ipod nano with two or more computers. Attempt of trying to synchronize any of them with iTunes on a different computer, or even with the same iTunes copy in the same computer but logged on as a different user, will raise the following warning. Category: Utilities / Misc. UtilitiesPublisher: Felipe Corsino, License: Freeware, Price: USD $0.00, File Size: 835.8 KBPlatform: Windows PageTurner is a PDF viewer is for everyone that wants to read through and search inside PDF documents. PageTurner is a Pdf Viewer is for everyone that wants to read through and search inside Pdf documents. Makes reading as pleasant an experience as reading from paper. It's developed with WPF/.net 3.5. This software is not being actively maintained. Not compatible with an increasing number Pdf files. PageTurner can't render PDFS with embedded JBIG and... Category: Utilities / Misc. UtilitiesPublisher: Jan de Vaan, License: Freeware, Price: USD $0.00, File Size: 2.5 MBPlatform: Windows CIB image is a free PDF viewer that lets you fill in PDF forms and save the form data. CIB image is a free Pdf Viewer that lets you fill in Pdf forms and save the form data. With CIB image you can save Pdf form data and process again at another time, save your data with CIB Pdf brewer as Pdf unchangeable, interchange and delete pages of a Pdf-document, open all Pdf documents and replace your Pdf-Reader, open the... Category: Business & Finance / MS Office AddonsPublisher: CIB software GmbH, License: Freeware, Price: USD $0.00, File Size: 25.5 MBPlatform: Windows Word Viewer is an easy-to-use Free Word Viewer,You can read Word 2010,2007,Word 97~2003,html,txt,rtf. You can convert Word 2007(docx),Word 97~2003(doc),Txt,Html,Rtf to PDF,DOCX,DOC.It is a multilingual software. Word Viewer is an easy-to-use Free Word Viewer,You can read MicroSoft Word 2010 (*.DOCX), Word 2007 (*.DOCX), MicroSoft Word 97-2003(*.DOC), Hyper Text Markup Language (*.Htm,*.Html), Plain Text Format (*.TXT), Rich Text Format (*.RTF). Word Viewer can convert Word 2007(docx),Word 97~2003(doc),Txt,Html,Rtf to Pdf. Word Viewer is a multilingual software,... Category: Business & Finance / ApplicationsPublisher: Abdio Software Inc, License: Freeware, Price: USD $0.00, File Size: 5.9 MBPlatform:. I have 3 computers in the church 2 synch fine all win 8.1 but my display computer will not synch. How to synch my computer and phone. How to synch a calendar with a smartphone. How to sync two phones. How to sync my Mac with other devices. Synch is easy
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Types of objects are instrumented. An instrumented object, when used by the server, produces an event. These tables provide event names and explanatory notes or status information. For example, the file_instances table lists instances of instruments for file I/O operations and their associated files: mysql> SELECT * FROM performance_schema.file_instances\G*************************** 1. row *************************** FILE_NAME: /opt/mysql-log/60500/binlog.000007EVENT_NAME: wait/io/file/sql/binlogOPEN_COUNT: 0*************************** 2. row *************************** FILE_NAME: /opt/mysql/60500/data/mysql/tables_priv.MYIEVENT_NAME: wait/io/file/myisam/kfileOPEN_COUNT: 1*************************** 3. row *************************** FILE_NAME: /opt/mysql/60500/data/mysql/columns_priv.MYIEVENT_NAME: wait/io/file/myisam/kfileOPEN_COUNT: 1... Setup tables are used to configure and display monitoring characteristics. For example, setup_instruments lists the set of instruments for which events can be collected and shows which of them are enabled: mysql> SELECT NAME, ENABLED, TIMED FROM performance_schema.setup_instruments;+---------------------------------------------------+---------+-------+| NAME | ENABLED | TIMED |+---------------------------------------------------+---------+-------+...| stage/sql/end | NO | NO || stage/sql/executing | NO | NO || stage/sql/init | NO | NO || stage/sql/insert | NO | NO |...| statement/sql/load | YES | YES || statement/sql/grant | YES | YES || statement/sql/check | YES | YES || statement/sql/flush | YES | YES |...| wait/synch/mutex/sql/LOCK_global_read_lock | YES | YES || wait/synch/mutex/sql/LOCK_global_system_variables | YES | YES || wait/synch/mutex/sql/LOCK_lock_db | YES | YES || wait/synch/mutex/sql/LOCK_manager | YES | YES |...| wait/synch/rwlock/sql/LOCK_grant | YES | YES || wait/synch/rwlock/sql/LOGGER::LOCK_logger | YES | YES || wait/synch/rwlock/sql/LOCK_sys_init_connect | YES | YES || wait/synch/rwlock/sql/LOCK_sys_init_slave | YES | YES |...| wait/io/file/sql/binlog | YES | YES || wait/io/file/sql/binlog_index | YES | YES || wait/io/file/sql/casetest | YES | YES || wait/io/file/sql/dbopt | YES | YES |... To understand how to interpret instrument names, see Section 29.6, “Performance Schema Instrument Naming Conventions”. To control whether events are collected for an instrument, set its ENABLED value to YES or NO. For example: mysql> UPDATE performance_schema.setup_instruments SET ENABLED = 'NO' WHERE NAME = 'wait/synch/mutex/sql/LOCK_mysql_create_db'; The Performance Schema uses collected events to update tables in the performance_schema database, which act as “consumers” of event information. TheGarrison Computer Services :: fmSQL Synch :: Configuration
Synch via command-line? Posted by: Jake Chung Date: March 31, 2009 07:28AM Thanks Edwin for the response on the Newbie forum =).I am using Workbench SE, but so far I have only been able to determine that I can use the Schema Synch feature via the GUI. Is there a way to use the Schema Synch feature via a command-line interface with Workbench? Or is there any other way I would be able to use the Schema Synch feature in Workbench with a batch file or VB script or any other script?I'm looking for a synch feature that could be used in product upgrades where a command-line utility would be used to compare the latest schema SQL file with the database that is local to the machine that the upgrade is run on. It would then execute the appropriate ALTER TABLE commands to synch up the database with the latest schema SQL file. This upgrade be done via an installer, and so I would like to avoid requiring a user to interact with the GUI to upgrade his/her database.Thanks for the help!Jake Subject Views Written By Posted Synch via command-line? 5117 March 31, 2009 07:28AM 3326 March 31, 2009 10:40PM 3417 March 31, 2009 10:42PM 3425 April 01, 2009 07:59AM Sorry, you can't reply to this topic. It has been closed. Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.. I have 3 computers in the church 2 synch fine all win 8.1 but my display computer will not synch.Garrison Computer Services :: fmSQL Synch :: Diagram
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14.17.2 Monitoring InnoDB Mutex Waits Using Performance Schema A mutex is a synchronization mechanism used in the code to enforce that only one thread at a given time can have access to a common resource. When two or more threads executing in the server need to access the same resource, the threads compete against each other. The first thread to obtain a lock on the mutex causes the other threads to wait until the lock is released. For InnoDB mutexes that are instrumented, mutex waits can be monitored using Performance Schema. Wait event data collected in Performance Schema tables can help identify mutexes with the most waits or the greatest total wait time, for example. The following example demonstrates how to enable InnoDB mutex wait instruments, how to enable associated consumers, and how to query wait event data. To view available InnoDB mutex wait instruments, query the Performance Schema setup_instruments table, as shown below. All InnoDB mutex wait instruments are disabled by default. mysql> SELECT * FROM performance_schema.setup_instruments WHERE NAME LIKE '%wait/synch/mutex/innodb%';+-------------------------------------------------------+---------+-------+| NAME | ENABLED | TIMED |+-------------------------------------------------------+---------+-------+| wait/synch/mutex/innodb/commit_cond_mutex | NO | NO || wait/synch/mutex/innodb/innobase_share_mutex | NO | NO || wait/synch/mutex/innodb/autoinc_mutex | NO | NO || wait/synch/mutex/innodb/buf_pool_mutex | NO | NO || wait/synch/mutex/innodb/buf_pool_zip_mutex | NO | NO || wait/synch/mutex/innodb/cache_last_read_mutex | NO | NO || wait/synch/mutex/innodb/dict_foreign_err_mutex | NO | NO || wait/synch/mutex/innodb/dict_sys_mutex | NO | NO || wait/synch/mutex/innodb/recalc_pool_mutex | NO | NO || wait/synch/mutex/innodb/file_format_max_mutex | NO | NO || wait/synch/mutex/innodb/fil_system_mutex | NO | NO || wait/synch/mutex/innodb/flush_list_mutex | NO | NO || wait/synch/mutex/innodb/fts_bg_threads_mutex | NO | NO || wait/synch/mutex/innodb/fts_delete_mutex | NO | NO || wait/synch/mutex/innodb/fts_optimize_mutex | NO | NO || wait/synch/mutex/innodb/fts_doc_id_mutex | NO | NO || wait/synch/mutex/innodb/log_flush_order_mutex | NO | NO || wait/synch/mutex/innodb/hash_table_mutex | NO | NO || wait/synch/mutex/innodb/ibuf_bitmap_mutex | NO | NO || wait/synch/mutex/innodb/ibuf_mutex | NO | NO || wait/synch/mutex/innodb/ibuf_pessimistic_insert_mutex | NO | NO || wait/synch/mutex/innodb/log_sys_mutex | NO | NO || wait/synch/mutex/innodb/page_zip_stat_per_index_mutex | NO | NO || wait/synch/mutex/innodb/purge_sys_pq_mutex | NO | NO || wait/synch/mutex/innodb/recv_sys_mutex | NO | NO || wait/synch/mutex/innodb/recv_writer_mutex | NO | NO || wait/synch/mutex/innodb/redo_rseg_mutex | NO | NO || wait/synch/mutex/innodb/noredo_rseg_mutex | NO | NO || wait/synch/mutex/innodb/rw_lock_list_mutex | NO | NO || wait/synch/mutex/innodb/rw_lock_mutex | NO | NO || wait/synch/mutex/innodb/srv_dict_tmpfile_mutex | NO | NO || wait/synch/mutex/innodb/srv_innodb_monitor_mutex | NO | NO || wait/synch/mutex/innodb/srv_misc_tmpfile_mutex | NO | NO || wait/synch/mutex/innodb/srv_monitor_file_mutex | NO | NO || wait/synch/mutex/innodb/buf_dblwr_mutex | NO | NO || wait/synch/mutex/innodb/trx_undo_mutex | NO | NO || wait/synch/mutex/innodb/trx_pool_mutex | NO | NO || wait/synch/mutex/innodb/trx_pool_manager_mutex | NO | NO || wait/synch/mutex/innodb/srv_sys_mutex | NO | NO || wait/synch/mutex/innodb/lock_mutex | NO | NO || wait/synch/mutex/innodb/lock_wait_mutex | NO | NO || wait/synch/mutex/innodb/trx_mutex | NO | NO || wait/synch/mutex/innodb/srv_threads_mutex | NO | NO || wait/synch/mutex/innodb/rtr_active_mutex | NO | NO || wait/synch/mutex/innodb/rtr_match_mutex | NO | NO || wait/synch/mutex/innodb/rtr_path_mutex | NO | NO || wait/synch/mutex/innodb/rtr_ssn_mutex | NO | NO || wait/synch/mutex/innodb/trx_sys_mutex | NO | NO || wait/synch/mutex/innodb/zip_pad_mutex | NO | NO |+-------------------------------------------------------+---------+-------+49 rows in set (0.02 sec) Some InnoDB mutex instances are created at server startup and are only instrumented if the associated instrument is also enabled at server startup.
2025-04-10Is presented in descending order, by the number of summarized wait events (COUNT_STAR). You can adjust the ORDER BY clause to order the data by total wait time. mysql> SELECT EVENT_NAME, COUNT_STAR, SUM_TIMER_WAIT/1000000000 SUM_TIMER_WAIT_MS FROM performance_schema.events_waits_summary_global_by_event_name WHERE SUM_TIMER_WAIT > 0 AND EVENT_NAME LIKE 'wait/synch/mutex/innodb/%' ORDER BY COUNT_STAR DESC;+--------------------------------------------------+------------+-------------------+| EVENT_NAME | COUNT_STAR | SUM_TIMER_WAIT_MS |+--------------------------------------------------+------------+-------------------+| wait/synch/mutex/innodb/os_mutex | 78831 | 10.3283 || wait/synch/mutex/innodb/log_sys_mutex | 41488 | 6510.3233 || wait/synch/mutex/innodb/trx_sys_mutex | 29770 | 1107.9687 || wait/synch/mutex/innodb/lock_mutex | 24212 | 104.0724 || wait/synch/mutex/innodb/trx_mutex | 22756 | 1.9421 || wait/synch/mutex/innodb/rseg_mutex | 20333 | 3.6220 || wait/synch/mutex/innodb/dict_sys_mutex | 13422 | 2.2284 || wait/synch/mutex/innodb/mutex_list_mutex | 12694 | 344.1164 || wait/synch/mutex/innodb/fil_system_mutex | 9208 | 0.9542 || wait/synch/mutex/innodb/rw_lock_list_mutex | 8304 | 0.1794 || wait/synch/mutex/innodb/trx_undo_mutex | 6190 | 0.6801 || wait/synch/mutex/innodb/buf_pool_mutex | 2869 | 29.4623 || wait/synch/mutex/innodb/innobase_share_mutex | 2005 | 0.1349 || wait/synch/mutex/innodb/flush_list_mutex | 1274 | 0.1300 || wait/synch/mutex/innodb/file_format_max_mutex | 1016 | 0.0469 || wait/synch/mutex/innodb/purge_sys_bh_mutex | 1004 | 0.0326 || wait/synch/mutex/innodb/buf_dblwr_mutex | 640 | 0.0437 || wait/synch/mutex/innodb/log_flush_order_mutex | 437 | 0.0510 || wait/synch/mutex/innodb/recv_sys_mutex | 394 | 0.0202 || wait/synch/mutex/innodb/srv_sys_mutex | 169 | 0.5259 || wait/synch/mutex/innodb/lock_wait_mutex | 154 | 0.1172 || wait/synch/mutex/innodb/ibuf_mutex | 9 | 0.0027 || wait/synch/mutex/innodb/srv_innodb_monitor_mutex | 2 | 0.0009 || wait/synch/mutex/innodb/ut_list_mutex | 1 | 0.0001 || wait/synch/mutex/innodb/recv_writer_mutex | 1 | 0.0005 |+--------------------------------------------------+------------+-------------------+25 rows in set (0.01 sec)Note The preceding result set includes wait event data produced during the startup process. To exclude this data, you can truncate the events_waits_summary_global_by_event_name table immediately after startup and before running your workload. However, the truncate operation itself may produce a negligible amount wait event data. mysql> TRUNCATE performance_schema.events_waits_summary_global_by_event_name;
2025-04-14| 686322 || 87 | wait/synch/mutex/mysys/THR_LOCK_malloc | 320535 || 88 | wait/synch/mutex/mysys/THR_LOCK_malloc | 339390 || 89 | wait/synch/mutex/mysys/THR_LOCK_malloc | 377100 || 90 | wait/synch/mutex/sql/LOCK_plugin | 614673 || 91 | wait/synch/mutex/sql/LOCK_open | 659925 || 92 | wait/synch/mutex/sql/THD::LOCK_thd_data | 494001 || 93 | wait/synch/mutex/mysys/THR_LOCK_malloc | 222489 || 94 | wait/synch/mutex/mysys/THR_LOCK_malloc | 214947 || 95 | wait/synch/mutex/mysys/LOCK_alarm | 312993 |+----------+-----------------------------------------+------------+ As new events are added to a history table, older events are discarded if the table is full. Summary tables provide aggregated information for all events over time. The tables in this group summarize event data in different ways. To see which instruments have been executed the most times or have taken the most wait time, sort the events_waits_summary_global_by_event_name table on the COUNT_STAR or SUM_TIMER_WAIT column, which correspond to a COUNT(*) or SUM(TIMER_WAIT) value, respectively, calculated over all events: mysql> SELECT EVENT_NAME, COUNT_STAR FROM performance_schema.events_waits_summary_global_by_event_name ORDER BY COUNT_STAR DESC LIMIT 10;+---------------------------------------------------+------------+| EVENT_NAME | COUNT_STAR |+---------------------------------------------------+------------+| wait/synch/mutex/mysys/THR_LOCK_malloc | 6419 || wait/io/file/sql/FRM | 452 || wait/synch/mutex/sql/LOCK_plugin | 337 || wait/synch/mutex/mysys/THR_LOCK_open | 187 || wait/synch/mutex/mysys/LOCK_alarm | 147 || wait/synch/mutex/sql/THD::LOCK_thd_data | 115 || wait/io/file/myisam/kfile | 102 || wait/synch/mutex/sql/LOCK_global_system_variables | 89 || wait/synch/mutex/mysys/THR_LOCK::mutex | 89 || wait/synch/mutex/sql/LOCK_open | 88 |+---------------------------------------------------+------------+mysql> SELECT EVENT_NAME, SUM_TIMER_WAIT FROM performance_schema.events_waits_summary_global_by_event_name ORDER BY SUM_TIMER_WAIT DESC LIMIT 10;+----------------------------------------+----------------+| EVENT_NAME | SUM_TIMER_WAIT |+----------------------------------------+----------------+| wait/io/file/sql/MYSQL_LOG | 1599816582 || wait/synch/mutex/mysys/THR_LOCK_malloc | 1530083250 || wait/io/file/sql/binlog_index | 1385291934 || wait/io/file/sql/FRM | 1292823243 || wait/io/file/myisam/kfile | 411193611 || wait/io/file/myisam/dfile | 322401645 || wait/synch/mutex/mysys/LOCK_alarm | 145126935 || wait/io/file/sql/casetest | 104324715 || wait/synch/mutex/sql/LOCK_plugin | 86027823 || wait/io/file/sql/pid | 72591750 |+----------------------------------------+----------------+ These results show that the THR_LOCK_malloc mutex is “hot,” both in terms of how often it is used and amount of time that threads wait attempting to acquire it.Note The THR_LOCK_malloc mutex is used only in debug builds. In production builds it is not hot because it is nonexistent. Instance tables document what
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