Rechercher dans le manuel MySQL
Search Results
https://dev.mysql.com/innodb-enabling-monitors.html
InnoDB monitor output begins with a header containing a timestamp and the monitor name. The --innodb-status-file option is intended for temporary use, as output generation can affect performance, and the innodb_status.pid file can become quite large ... When InnoDB monitors are enabled for periodic output, InnoDB writes the output to mysqld server standard error output (stderr) every 15 seconds, ...
https://dev.mysql.com/innodb-file-defragmenting.html
Another symptom of fragmentation is that a table scan such as this takes more time than it “should” take: SELECT COUNT(*) FROM t WHERE non_indexed_column <> 12345; The preceding query requires MySQL to perform a full table scan, the slowest type ... Random insertions into or deletions from a secondary index can cause the index to become ...
https://dev.mysql.com/innodb-file-per-table-tablespaces.html
An innodb_file_per_table setting can be specified in an option file or configured at runtime using a SET GLOBAL statement. Changing the setting at runtime requires privileges sufficient to set global system variables. Option file: [mysqld] ... A ...
https://dev.mysql.com/innodb-ft-index-cache-table.html
The same word can occur several times within the cache table, once for each combination of DOC_ID and POSITION values. The INNODB_FT_INDEX_CACHE table provides token information about newly inserted rows in a FULLTEXT index. Before querying it, set ...
https://dev.mysql.com/innodb-ft-index-table-table.html
The same word can occur several times within the cache table, once for each combination of DOC_ID and POSITION values. The INNODB_FT_INDEX_TABLE table provides information about the inverted index used to process text searches against the FULLTEXT ...
https://dev.mysql.com/innodb-information-schema-compression-tables.html
There are two pairs of InnoDB INFORMATION_SCHEMA tables about compression that can provide insight into how well compression is working overall: INNODB_CMP and INNODB_CMP_RESET provide information about the number of compression operations and the ...INNODB_CMPMEM and INNODB_CMPMEM_RESET provide information about the way memory is allocated for ...
https://dev.mysql.com/innodb-information-schema-examples.html
SELECT THREAD_ID, SQL_TEXT FROM performance_schema.events_statements_history WHERE THREAD_ID = 28 ORDER BY EVENT_ID; Sometimes it is useful to correlate internal InnoDB locking information with the session-level information maintained by MySQL.
https://dev.mysql.com/innodb-information-schema-internal-data.html
Data retrieved from the lock tables exists when the SELECT is executed, but might be gone or changed by the time the query result is consumed by the client. Note This section describes locking information as exposed by the Performance Schema ...
https://dev.mysql.com/innodb-information-schema-understanding-innodb-locking.html
At any given time, a transaction may request a lock that is held by another transaction, in which case it is blocked by that other transaction. Note This section describes locking information as exposed by the Performance Schema data_locks and ...
https://dev.mysql.com/innodb-introduction.html
InnoDB is a general-purpose storage engine that balances high reliability and high performance. Unless you have configured a different default storage engine, issuing a CREATE TABLE statement without an ENGINE= clause creates an InnoDB table. Key ...
Document created the 26/06/2006, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/mysql-rf-fct-time-p-63.html
The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.
References
These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.
