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https://dev.mysql.com/doc/refman/8.0/en/json-utility-functions.html
JSON_STORAGE_SIZE() and JSON_STORAGE_FREE() show, respectively, the amount of storage space used by a given JSON value and the amount of space remaining in a JSON column following a partial update. For a JSON column which has been updated such that ... This section documents utility functions that act on JSON values, or strings that can be parsed as JSON ...
https://dev.mysql.com/doc/refman/8.0/en/table-scan-avoidance.html
You are comparing indexed columns with constant values and MySQL has calculated (based on the index tree) that the constants cover too large a part of the table and that a table scan would be faster. This is common for tables with fewer than 10 rows ... The output from EXPLAIN shows ALL in the type column when MySQL uses a full table scan to resolve a ...
https://dev.mysql.com/doc/refman/8.0/en/delete.html
InnoDB Tables If you are deleting many rows from a large table, you may exceed the lock table size for an InnoDB table. To ensure that a given DELETE statement does not take too much time, the MySQL-specific LIMIT row_count clause for DELETE ...A ...
https://dev.mysql.com/doc/refman/8.0/en/with.html
A CTE that produces many rows may require an internal temporary table large enough to be converted from in-memory to on-disk format and may suffer a performance penalty. -- return additional row sets The first SELECT produces the initial row or rows ... A common table expression (CTE) is a named temporary result set that exists within the scope of a single statement and that can be referred to later within that statement, possibly multiple ...
https://dev.mysql.com/doc/refman/8.0/en/pluggable-authentication-system-variables.html
authentication_ldap_sasl_init_pool_size Command-Line Format --authentication-ldap-sasl-init-pool-size=# System Variable authentication_ldap_sasl_init_pool_size Scope Global Dynamic Yes SET_VAR Hint Applies No Type Integer Default Value 10 Minimum ...
https://dev.mysql.com/doc/refman/8.0/en/optimize-overview.html
Are all memory areas used for caching sized correctly? That is, large enough to hold frequently accessed data, but not so large that they overload physical memory and cause paging. Does each table use an appropriate row format? This choice also ...
https://dev.mysql.com/doc/refman/8.0/en/alter-instance.html
If the CRL file is large, the server allocates a large chunk of memory (ten times the file size), which is doubled while the new instance is being loaded and the old one has not yet been released. The process resident memory is not immediately ...
https://dev.mysql.com/doc/refman/8.0/en/merge-table-advantages.html
You can split a large read-only table based on some criteria, and then put individual tables on different disks. A MERGE table structured this way could be much faster than using a single large table. It is easier to repair individual smaller tables ... MERGE tables can help you solve the following problems: Easily manage a set of log ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-file-per-table-tablespaces.html
By comparison, each file-per-table tablespace has a 64TB size limit, which provides plenty of room for individual tables to grow in size. In other words, a shared tablespace data file does not shrink in size after a table is truncated or dropped. A ...
https://dev.mysql.com/doc/refman/8.0/en/replication-solutions-backups.html
There are therefore two choices: If you are using replication as a solution to enable you to back up the data on the source, and the size of your database is not too large, the mysqldump tool may be suitable. How you back up a database depends on ...