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https://dev.mysql.com/doc/mysql-em-plugin/en/myoem-performance-page-statements.html
The Statements dashboard displays information on the various types of statement executed on the monitored server. Table 5.7 Statements Performance Page Regions GraphDescriptionDML Statements Graphs the number and type of DML statements. The ...
https://dev.mysql.com/doc/ndbapi/en/ndb-start-establishing-connection.html
When invoked without any arguments, the connection attempt is retried indefinitely, once per second, until successful. To enable connections with data nodes, use wait_until_ready() after calling connect(); wait_until_ready() waits up to a given ...
https://dev.mysql.com/doc/mysql-ai/9.5/en/mys-mysqlai-ml-train.html
IP DATETIME TIME HEX IPPORT OCID window_size: Specifies the maximum number of log lines to be grouped for anomaly detection. The table cannot exceed 10 GB, 100 million rows, or 1017 columns. When ML_TRAIN finishes executing, retrieve the generated ... Run the ML_TRAIN routine on a training dataset to produce a trained machine learning ...
https://dev.mysql.com/doc/internals/en/user-level-locks.html
--error ER_LOCK_WAIT_TIMEOUT reap; # Now let conn1 get the lock and continue. User-level locks are controlled with the SQL functions GET_LOCK(str,timeout) IS_FREE_LOCK(str) IS_USED_LOCK(str) RELEASE_LOCK(str) They can be used at places where SQL ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-ndbinfo-diskstats-1sec.html
The diskstats_1sec table provides information about writes to Disk Data tablespaces over the past 20 seconds.
https://dev.mysql.com/doc/internals/en/negative-tests.html
If an error does not occur, that itself indicates a problem. DO NOT FORGET "NEGATIVE" TESTS where we expect to see fine error messages from the server. Column with numeric data type: NULL, 0 Minimum - 1, Minimum, Minimum + 1 Maximum - 1, Maximum, ...
https://dev.mysql.com/doc/internals/en/better-protocols-example.html
The output becomes less clear because there is no indication that the connection has been changed. SET @aux = 1; SELECT @aux AS "content of @aux is"; content of @aux is 1 SELECT @aux AS "content of @aux is"; content of @aux is NULL .
https://dev.mysql.com/doc/refman/8.4/en/group-replication-message-compression.html
Note that the maximum supported input size for the LZ4 compression algorithm is 2113929216 bytes. This limit is lower than the maximum possible value for the group_replication_compression_threshold system variable, which is matched to the maximum ...
https://dev.mysql.com/doc/refman/8.4/en/memory-storage-engine.html
Performance Characteristics MEMORY performance is constrained by contention resulting from single-thread execution and table lock overhead when processing updates. A server restart also sets the maximum size of existing MEMORY tables to the global ... The MEMORY storage engine (formerly known as HEAP) creates special-purpose tables with contents that are stored in ...
https://dev.mysql.com/doc/internals/en/zlib-directory.html
Replace the second occurrence of the substring with (a) a pointer to the first occurrence, plus (b) an indication of the length of the first occurrence. zlib is a data compression library used to support the compressed protocol and the ...