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https://dev.mysql.com/doc/refman/5.7/en/sys-ps-setup-save.html
This enables you to alter the configuration temporarily for debugging or other purposes, then restore it to the previous state by invoking the ps_setup_reload_saved() procedure. It is intended you call ps_setup_reload_saved() later within the same ...To prevent other simultaneous calls to save the configuration, ps_setup_save() acquires an advisory lock named sys.ps_setup_save by calling the GET_LOCK() ...
https://dev.mysql.com/doc/refman/5.7/en/account-locking.html
MySQL supports locking and unlocking user accounts using the ACCOUNT LOCK and ACCOUNT UNLOCK clauses for the CREATE USER and ALTER USER statements: When used with CREATE USER, these clauses specify the initial locking state for a new account. When ...In the absence of either clause, the account is created in an unlocked ...
https://dev.mysql.com/doc/refman/5.7/en/stored-routines-syntax.html
Stored routines can be dropped with the DROP PROCEDURE and DROP FUNCTION statements (see Section 13.1.27, “DROP PROCEDURE and DROP FUNCTION Statements”), and altered with the ALTER PROCEDURE and ALTER FUNCTION statements (see Section 13.1.6, ...
https://dev.mysql.com/doc/refman/5.7/en/validate-password.html
This applies to the ALTER USER, CREATE USER, GRANT, and SET PASSWORD statements, and passwords given as arguments to the PASSWORD() function. Note For statements that assign, modify, or generate account passwords (ALTER USER, CREATE USER, GRANT, and ... The validate_password plugin serves to improve security by requiring account passwords and enabling strength testing of potential ...
https://dev.mysql.com/doc/refman/5.7/en/apache.html
There are programs that let you authenticate your users from a MySQL database and also let you write your log files into a MySQL table.
https://dev.mysql.com/doc/refman/5.7/en/binary-varbinary.html
Instead, it causes the binary (_bin) collation for the column character set (or the table default character set if no column character set is specified) to be used, and the column itself stores nonbinary character strings rather than binary byte ...
https://dev.mysql.com/doc/refman/5.7/en/bit-functions.html
Table 12.17 Bit Functions and Operators Name Description & Bitwise AND >> Right shift << Left shift ^ Bitwise XOR BIT_COUNT() Return the number of bits that are set | Bitwise OR ~ Bitwise inversion The following list describes available bit ...
https://dev.mysql.com/doc/refman/5.7/en/calculating-days.html
CREATE TABLE t1 (year YEAR, month INT UNSIGNED, day INT UNSIGNED); INSERT INTO t1 VALUES(2000,1,1),(2000,1,20),(2000,1,30),(2000,2,2), (2000,2,23),(2000,2,23); The example table contains year-month-day values representing visits by users to the page. The following example shows how you can use the bit group functions to calculate the number of days per month a user has visited a Web ...
https://dev.mysql.com/doc/refman/5.7/en/charset-collation-implementations.html
MySQL implements several types of collations: Simple collations for 8-bit character sets This kind of collation is implemented using an array of 256 weights that defines a one-to-one mapping from character codes to weights. It is a case-insensitive ...
https://dev.mysql.com/doc/refman/5.7/en/charset-collation-information-schema.html
String columns in INFORMATION_SCHEMA tables have a collation of utf8_general_ci, which is case-insensitive. However, for values that correspond to objects that are represented in the file system, such as databases and tables, searches in ...For ...