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https://dev.mysql.com/doc/refman/8.0/en/json-search-functions.html
row *************************** id: 1 select_type: SIMPLE table: jemp partitions: NULL type: range possible_keys: i key: i key_len: 5 ref: NULL rows: 2 filtered: 100.00 Extra: Using where 1 row in set, 1 warning (0.00 sec) mysql> SHOW WARNINGS\G ...
https://dev.mysql.com/doc/refman/8.0/en/cursor-restrictions.html
One limitation of the implementation is that for a large result set, retrieving its rows through a cursor might be slow. A server-side cursor enables a result set to be generated on the server side, but not transferred to the client except for those ... Server-side cursors are implemented in the C API using the mysql_stmt_attr_set() ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-innodb-storage-layout.html
Once your data reaches a stable size, or a growing table has increased by tens or some hundreds of megabytes, consider using the OPTIMIZE TABLE statement to reorganize the table and compact any wasted space. This operation can be slow if the table ...The reorganized tables require less disk I/O to perform full table ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-restrictions-limitations.html
mysql> CREATE TABLE t1 (c1 INT, db_row_id INT) ENGINE=INNODB; ERROR 1166 (42000): Incorrect column name 'db_row_id' SHOW TABLE STATUS does not provide accurate statistics for InnoDB tables except for the physical size reserved by the table. You ...
https://dev.mysql.com/doc/refman/8.0/en/mrr-optimization.html
Reading rows using a range scan on a secondary index can result in many random disk accesses to the base table when the table is large and not stored in the storage engine's cache. With the Disk-Sweep Multi-Range Read (MRR) optimization, MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/replication-features-functions.html
For a two-row insert, you can do this: SET @my_uuid1 = UUID(); @my_uuid2 = UUID(); INSERT INTO t VALUES(@my_uuid1),(@my_uuid2); However, if the number of rows is large or unknown, the workaround is difficult or impracticable. Certain functions do ...(See also Section 19.5.1.8, “Replication of CURRENT_USER()”.) This is also true for VERSION() and ...
https://dev.mysql.com/doc/refman/8.0/en/window-function-restrictions.html
You should also be aware that queries using very large numbers of windows may require increasing the default thread stack size (thread_stack system variable). The SQL standard imposes a constraint on window functions that they cannot be used in ...
https://dev.mysql.com/doc/refman/8.0/en/using-innodb-tables.html
row *************************** TABLE_ID: 1144 NAME: test/t1 FLAG: 33 N_COLS: 5 SPACE: 30 ROW_FORMAT: Dynamic ZIP_PAGE_SIZE: 0 SPACE_TYPE: Single INSTANT_COLS: 0 For more information, see Section 17.15.3, “InnoDB INFORMATION_SCHEMA Schema Object ...Row Formats The row format of an InnoDB table determines how its rows are physically stored on ... 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 ...
https://dev.mysql.com/doc/refman/8.0/en/secure-client-programming.html
This is an extreme example, but large security leaks and data loss might occur as a result of hackers using similar techniques, if you do not prepare for them. As a result, the server retrieves every row in the table. Even if it is permissible to ...
https://dev.mysql.com/doc/refman/8.0/en/audit-log-file-formats.html
Only this format supports the optional query time and size statistics, which are available from MySQL 8.0.30. When the audit log plugin opens the audit log file, it initializes the sequence number to the size of the audit log file, then increments ... The MySQL server calls the audit log plugin to write an audit record to its log file whenever an auditable event ...