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https://dev.mysql.com/doc/refman/5.7/en/group-by-handling.html
The query is invalid if name is not a primary key of t or a unique NOT NULL column. SQL-92 and earlier does not permit queries for which the select list, HAVING condition, or ORDER BY list refer to nonaggregated columns that are not named in the ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-operations-per-fragment.html
The operations_per_fragment table provides information about the operations performed on individual fragments and fragment replicas, as well as about some of the results from these operations. This currently has the following formats: Base table: ...
https://dev.mysql.com/doc/refman/5.7/en/optimizing-innodb-bulk-data-loading.html
For optimal performance when loading data into an InnoDB FULLTEXT index, follow this set of steps: Define a column FTS_DOC_ID at table creation time, of type BIGINT UNSIGNED NOT NULL, with a unique index named FTS_DOC_ID_INDEX. For example: CREATE ... These performance tips supplement the general guidelines for fast inserts in Section 8.2.4.1, “Optimizing INSERT ...
https://dev.mysql.com/doc/refman/5.7/en/static-format.html
NULL columns require additional space in the row to record whether their values are NULL. Each NULL column takes one bit extra, rounded up to the nearest byte. The expected row length in bytes for static-sized rows is calculated using the following ...It is used when the table contains no variable-length columns (VARCHAR, VARBINARY, BLOB, or ...
https://dev.mysql.com/doc/refman/5.7/en/sys-ps-trace-thread.html
Use NULL to collect data for the default of 60 seconds. Dumps all Performance Schema data for an instrumented thread to a .dot formatted graph file (for the DOT graph description language). Each result set returned from the procedure should be used ...
https://dev.mysql.com/doc/refman/5.7/en/using-innodb-tables.html
row *************************** Name: t1 Engine: InnoDB Version: 10 Row_format: Dynamic Rows: 0 Avg_row_length: 0 Data_length: 16384 Max_data_length: 0 Index_length: 0 Data_free: 0 Auto_increment: NULL Create_time: 2021-02-18 12:18:28 Update_time: ... InnoDB tables are created using the CREATE TABLE statement; for example: CREATE TABLE t1 (a INT, b CHAR (20), PRIMARY KEY (a)) ENGINE=InnoDB; The ENGINE=InnoDB clause is not required when InnoDB is defined as the default storage engine, which it is by ...
https://dev.mysql.com/doc/refman/5.7/en/fulltext-search-ngram.html
For example, with a token size of 2, the ngram parser parses the string “abc def” into four tokens: “ab”, “bc”, “de” and “ef”. For example, the string “abc” (assuming ngram_token_size=2) is converted to “ab bc”. For ...
https://dev.mysql.com/doc/refman/5.7/en/migrating-from-year2.html
YEAR(2) Limitations Issues with the YEAR(2) data type include ambiguity of displayed values, and possible loss of information when values are dumped and reloaded or converted to strings. Conversion of a 2-digit or 4-digit YEAR data value to string ... This section describes problems that can occur when using the 2-digit YEAR(2) data type and provides information about converting existing YEAR(2) columns to 4-digit year-valued columns, which can be declared as YEAR with an implicit display width of 4 characters, or equivalently as YEAR(4) with an explicit display ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-size-pl.html
This is a Perl script that can be used to estimate the amount of space that would be required by a MySQL database if it were converted to use the NDBCLUSTER storage engine. Unlike the other utilities discussed in this section, it does not require ...
https://dev.mysql.com/doc/refman/5.7/en/host-cache.html
Initially, the host name is set to NULL and the flag is false. For permanent failures, the host name remains NULL and the validation flag is set to true. The MySQL server maintains an in-memory host cache that contains information about clients: IP ...