SQL · Theory

Account Lock

Theory

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Account Lock

ALTER USER 'asha'@'localhost' ACCOUNT LOCK; stops that MySQL user from logging in. Unlock with ACCOUNT UNLOCK. This is a user account, not a table row.

Use it when a intern leaves or a password leak happens — lock first, rotate password, unlock if needed.

Trap — confusing ACCOUNT LOCK with LOCK TABLES.

On the example next to this theory: Account Lock: create two demo rows, then SELECT qty >= 2 ordered. Say which labels come back.

Exam tip

ALTER USER 'asha'@'localhost' ACCOUNT LOCK;

Account Lock — sample query

-- Account Lock
CREATE TABLE demo (
  id INTEGER PRIMARY KEY,
  label TEXT NOT NULL,
  qty INTEGER DEFAULT 0
);
INSERT INTO demo (id, label, qty) VALUES
  (1, 'alpha', 2),
  (2, 'beta', 5);
SELECT label, qty FROM demo WHERE qty >= 2 ORDER BY qty DESC;

Account Lock: create two demo rows, then SELECT qty >= 2 ordered. Say which labels come back.

Short notes

DefACCOUNT LOCK disables a MySQL login.
RuleALTER USER 'u'@'host' ACCOUNT LOCK;
TrapMixing this with table LOCK TABLES.

-- Account Lock CREATE TABLE demo ( id INTEGER PRIMARY KEY, label TEXT NOT NULL, qty INTEGER DEFAULT 0 ); INSERT INTO demo (id, label, qty) VALUES (1, 'alpha', 2), (2, 'beta', 5); SELECT label, qty FROM demo WHERE qty >= 2 ORDER BY qty DESC;

Account Lock

Account Lock — sample query

Short notes

Questions

Account Lock

Account Lock — sample query

Short notes

Questions