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https://dev.mysql.com/doc/refman/5.7/en/bug-reports.html
If you get a parse error for an SQL statement, please check your syntax closely. For solutions to some common problems, see Section B.3, “Problems and Common Errors”. Writing a good bug report takes patience, but doing it right the first time ...
https://dev.mysql.com/doc/refman/5.7/en/sys-ps-setup-save.html
ps_setup_save() takes a timeout parameter to indicate how many seconds to wait if the lock already exists (which indicates that some other session has a saved configuration outstanding). Parameters in_timeout INT: How many seconds to wait to obtain ...This procedure disables binary logging during its execution by manipulating the session value of the sql_log_bin system ...This enables you to alter the configuration ...
https://dev.mysql.com/doc/refman/5.7/en/replication-gtids-failover.html
Executing the entire transaction history can be time-consuming when the source server has processed a large number of transactions previously, and this can represent a major bottleneck when setting up a new replica. Copying over binary logs to the ...The easiest way to reproduce all identifiers and transactions on a new server is to make the new server into the replica of a source that has the entire execution history, and enable global transaction identifiers on both ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-examples-compression-sect.html
Compressing or uncompressing pages has consumed less than a second since the time the statistics were reset, because the columns COMPRESS_TIME and UNCOMPRESS_TIME are zero. This copying of SUM(PAGE_SIZE*RELOCATION_OPS) bytes has consumed less than a ... Example 14.1 Using the Compression Information Schema Tables The following is sample output from a database that contains compressed tables (see Section 14.9, “InnoDB Table and Page Compression”, INNODB_CMP, INNODB_CMP_PER_INDEX, and ...
https://dev.mysql.com/doc/refman/5.7/en/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/doc/refman/5.7/en/mysql-cluster-ndb-innodb-usage.html
When comparing application feature requirements to the capabilities of InnoDB with NDB, some are clearly more compatible with one storage engine than the other. The following table lists supported application features according to the storage ...
https://dev.mysql.com/doc/refman/5.7/en/sys-latest-file-io.html
These views summarize file I/O activity, grouped by file and thread. The latest_file_io and x$latest_file_io views have these columns: thread For foreground threads, the account associated with the thread (and port number for TCP/IP connections).
https://dev.mysql.com/doc/refman/5.7/en/installing-source-distribution.html
If you have multiple source trees at the same level (for example, to build multiple versions of MySQL), the second strategy can be advantageous. With the second strategy, you can use the same name for the build directory within each source tree. To ...
https://dev.mysql.com/doc/refman/5.7/en/dbug-package.html
Here are some example debug control strings as they might be specified on a shell command line: --debug=d:t --debug=d:f,main,subr1:F:L:t,20 --debug=d,input,output,files:n --debug=d:t:i:O,\\mysqld.trace For mysqld, it is also possible to change DBUG ... The MySQL server and most MySQL clients are compiled with the DBUG package originally created by Fred ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-memcached-intro.html
For example, you can change the port that memcached listens on, reduce the maximum number of simultaneous connections, change the maximum memory size for a key-value pair, or enable debugging messages for the error log. Batch size options default to ... The InnoDB memcached plugin implements memcached as a MySQL plugin daemon that accesses the InnoDB storage engine directly, bypassing the MySQL SQL ...