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https://dev.mysql.com/doc/refman/8.0/en/information-schema-schema-privileges-table.html
The SCHEMA_PRIVILEGES table has these columns: GRANTEE The name of the account to which the privilege is granted, in 'user_name'@'host_name' format. TABLE_CATALOG The name of the catalog to which the schema belongs. The value can be any privilege ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-schemata-table.html
The following statements are equivalent: SELECT SCHEMA_NAME AS `Database` FROM INFORMATION_SCHEMA.SCHEMATA [WHERE SCHEMA_NAME LIKE 'wild'] SHOW DATABASES [LIKE 'wild'] You see only those databases for which you have some kind of privilege, unless ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-statistics-table.html
The following statements are equivalent: SELECT * FROM INFORMATION_SCHEMA.STATISTICS WHERE table_name = 'tbl_name' AND table_schema = 'db_name' SHOW INDEX FROM tbl_name FROM db_name In MySQL 8.0.30 and later, information about generated invisible ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-table-privileges-table.html
The TABLE_PRIVILEGES table has these columns: GRANTEE The name of the account to which the privilege is granted, in 'user_name'@'host_name' format. TABLE_CATALOG The name of the catalog to which the table belongs. TABLE_SCHEMA The name of the schema ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-triggers-table.html
Example The following example uses the ins_sum trigger defined in Section 27.3, “Using Triggers”: mysql> SELECT * FROM INFORMATION_SCHEMA.TRIGGERS WHERE TRIGGER_SCHEMA='test' AND TRIGGER_NAME='ins_sum'\G *************************** 1. To see ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-user-privileges-table.html
The USER_PRIVILEGES table has these columns: GRANTEE The name of the account to which the privilege is granted, in 'user_name'@'host_name' format. The value can be any privilege that can be granted at the global level; see Section 15.7.1.6, “GRANT ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-analyze-table-complexity.html
ANALYZE TABLE complexity for InnoDB tables is dependent on: The number of pages sampled, as defined by innodb_stats_persistent_sample_pages. The number of indexed columns in a table The number of partitions. If a table has no partitions, the number ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-benchmarking.html
ENGINE=InnoDB AS SELECT * FROM other_engine_table; To assess performance with a full application under a realistic workload, install the latest MySQL server and run benchmarks. If InnoDB is not the default storage engine, you can determine if your ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-best-practices.html
To get exclusive write access to a set of rows, use the SELECT ... Specify a primary key for every table using the most frequently queried column or columns, or an auto-increment value if there is no obvious primary key. Use joins wherever data is ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-buffer-pool.html
A table scan, performed for a mysqldump operation or a SELECT statement with no WHERE clause, for example, can bring a large amount of data into the buffer pool and evict an equivalent amount of older data, even if the new data is never used again.