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https://dev.mysql.com/doc/refman/8.0/en/explain.html
For complex statements, the JSON output can be quite large; in particular, it can be difficult when reading it to pair the closing bracket and opening brackets; to cause the JSON structure's key, if it has one, to be repeated near the closing ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-tips.html
Setting max_join_size to 1,000,000 causes multiple-table SELECT statements to produce an error if the server estimates it must examine more than 1,000,000 row combinations. For example, the left-arrow and right-arrow keys move horizontally within ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-transporters.html
Rows where the node_id is that of a data node which is not currently connected are not shown in this table. In this state, any new scan using this transporter has its batch size reduced to minimize the load on the transporter. In NDB 8.0.37 and ...
https://dev.mysql.com/doc/refman/8.0/en/insert-optimization.html
To optimize insert speed, combine many small operations into a single large operation. Ideally, you make a single connection, send the data for many new rows at once, and delay all index updates and consistency checking until the very end. The size ...When loading a table from a text file, use LOAD ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-system-tables.html
row *************************** TABLE_ID: 71 NAME: test/t1 FLAG: 1 N_COLS: 6 SPACE: 57 ROW_FORMAT: Compact ZIP_PAGE_SIZE: 0 INSTANT_COLS: 0 Table t1 has a TABLE_ID of 71. Also provided are tablespace ROW_FORMAT, PAGE_SIZE, and several other ...There ... You can extract metadata about schema objects managed by InnoDB using InnoDB INFORMATION_SCHEMA ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-event-tables.html
The _current table for each event type contains one row per thread, so there is no system variable for configuring its maximum size. Typical autosized values are 10 rows per thread for _history tables, and 10,000 rows total for _history_long tables.
https://dev.mysql.com/doc/refman/8.0/en/select.html
The offset of the initial row is 0 (not 1): SELECT * FROM tbl LIMIT 5,10; # Retrieve rows 6-15 To retrieve all rows from a certain offset up to the end of the result set, you can use some large number for the second parameter. SELECT [ALL | ...
https://dev.mysql.com/doc/refman/8.0/en/range-optimization.html
Use of index statistics is less accurate than index dives but permits faster row estimation for large value lists. The range access method uses a single index to retrieve a subset of table rows that are contained within one or several index value ...The following sections describe conditions under which the optimizer uses range ...
https://dev.mysql.com/doc/refman/8.0/en/myisam-start.html
If the file size would be larger than this value, the index is created using the key cache instead, which is slower. bulk_insert_buffer_size The size of the tree cache used in bulk insert optimization. myisam_max_sort_file_size The maximum size of ... The following options to mysqld can be used to change the behavior of MyISAM ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-buffer-page-lru-table.html
Querying this table can require MySQL to allocate a large block of contiguous memory, more than 64 bytes times the number of active pages in the buffer pool. When tables, table rows, partitions, or indexes are deleted, associated pages remain in the ... The INNODB_BUFFER_PAGE_LRU table provides information about the pages in the InnoDB buffer pool; in particular, how they are ordered in the LRU list that determines which pages to evict from the buffer pool when it becomes ...