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https://dev.mysql.com/doc/refman/5.7/en/view-updatability.html
(Even if a view is updatable, it might not be possible to insert into it, as described elsewhere in this section.) The IS_UPDATABLE flag may be unreliable if a view depends on one or more other views, and one of these underlying views is updated.
https://dev.mysql.com/doc/refman/5.7/en/char.html
The following table illustrates the differences between CHAR and VARCHAR by showing the result of storing various string values into CHAR(4) and VARCHAR(4) columns (assuming that the column uses a single-byte character set such as latin1). If a ...
https://dev.mysql.com/doc/refman/5.7/en/converting-tables-to-innodb.html
For example, if you insert related pieces of information into several tables, do a single COMMIT after making all the changes. Transferring Data To transfer a large volume of data into an empty InnoDB table created as shown in the previous section, ... If you have MyISAM tables that you want to convert to InnoDB for better reliability and scalability, review the following guidelines and tips before ...
https://dev.mysql.com/doc/refman/5.7/en/create-event.html
CREATE [DEFINER = user] EVENT [IF NOT EXISTS] event_name ON SCHEDULE schedule [ON COMPLETION [NOT] PRESERVE] [ENABLE | DISABLE | DISABLE ON SLAVE] [COMMENT 'string'] DO event_body; schedule: { AT timestamp [+ INTERVAL interval] ... The event does ...
https://dev.mysql.com/doc/refman/5.7/en/events-privileges.html
This user then creates the following event: CREATE EVENT e_insert ON SCHEDULE EVERY 7 SECOND DO INSERT INTO myschema.mytable; After this event has been created, root revokes the EVENT privilege for jon@ghidora. However, e_insert continues to ... To ...
https://dev.mysql.com/doc/refman/5.7/en/faqs-mysql-cluster.html
How do I import an existing MySQL database into an NDB Cluster? A.10.28. How do I import an existing MySQL database into an NDB Cluster? You can import databases into NDB Cluster much as you would with any other version of MySQL. What happens to NDB ... In the following section, we answer questions that are frequently asked about NDB Cluster and the NDB storage ...
https://dev.mysql.com/doc/refman/5.7/en/fulltext-boolean.html
The full-text engine splits the phrase into words and performs a search in the FULLTEXT index for the words. '+apple macintosh' Find rows that contain the word “apple”, but rank rows higher if they also contain “macintosh”. '+apple ... MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/fulltext-search-mecab.html
The MeCab full-text parser plugin is a full-text parser plugin for Japanese that tokenizes a sequence of text into meaningful words. For example, MeCab tokenizes “データベース管理” (“Database Management”) into ... The built-in MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-change-buffer.html
The buffered changes, which may result from INSERT, UPDATE, or DELETE operations (DML), are merged later when the pages are loaded into the buffer pool by other read operations. Figure 14.3 Change Buffer Unlike clustered indexes, secondary indexes ... The change buffer is a special data structure that caches changes to secondary index pages when those pages are not in the buffer ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-performance-midpoint_insertion.html
Rather than using a strict LRU algorithm, InnoDB uses a technique to minimize the amount of data that is brought into the buffer pool and never accessed again. Newly read blocks are inserted into the middle of the LRU list. This arrangement divides ...The goal is to make sure that frequently accessed (“hot”) pages remain in the buffer pool, even as read-ahead and full table scans bring in new blocks that might or might not be accessed ...