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Rechercher dans le manuel MySQL

13.7.1.1 ALTER USER Syntax

Contents
  1. ALTER USER [IF EXISTS]
  2.     user [auth_option] [, user [auth_option]] ...
  3.     [REQUIRE {NONE | tls_option [[AND] tls_option] ...}]
  4.     [WITH resource_option [resource_option] ...]
  5.     [password_option | lock_option] ...
  6.  
  7. ALTER USER [IF EXISTS] USER() user_func_auth_option
  8.  
  9. ALTER USER [IF EXISTS]
  10.     user DEFAULT ROLE
  11.     {NONE | ALL | role [, role ] ...}
  12.  
  13. user:
  14.     (see Section 6.2.4, “Specifying Account Names”)
  15.  
  16. auth_option: {
  17.     IDENTIFIED BY 'auth_string'
  18.         [REPLACE 'current_auth_string']
  19.         [RETAIN CURRENT PASSWORD]
  20.   | IDENTIFIED WITH auth_plugin
  21.   | IDENTIFIED WITH auth_plugin BY 'auth_string'
  22.         [REPLACE 'current_auth_string']
  23.         [RETAIN CURRENT PASSWORD]
  24.   | IDENTIFIED WITH auth_plugin AS 'auth_string'
  25.   | DISCARD OLD PASSWORD
  26. }
  27.  
  28. user_func_auth_option: {
  29.     IDENTIFIED BY 'auth_string'
  30.         [REPLACE 'current_auth_string']
  31.         [RETAIN CURRENT PASSWORD]
  32.   | DISCARD OLD PASSWORD
  33. }
  34.  
  35. tls_option: {
  36.    SSL
  37.  | X509
  38.  | CIPHER 'cipher'
  39.  | ISSUER 'issuer'
  40.  | SUBJECT 'subject'
  41. }
  42.  
  43. resource_option: {
  44.     MAX_QUERIES_PER_HOUR count
  45.   | MAX_UPDATES_PER_HOUR count
  46.   | MAX_CONNECTIONS_PER_HOUR count
  47.   | MAX_USER_CONNECTIONS count
  48. }
  49.  
  50. password_option: {
  51.     PASSWORD EXPIRE [DEFAULT | NEVER | INTERVAL N DAY]
  52.   | PASSWORD HISTORY {DEFAULT | N}
  53.   | PASSWORD REUSE INTERVAL {DEFAULT | N DAY}
  54.   | PASSWORD REQUIRE CURRENT [DEFAULT | OPTIONAL]
  55. }
  56.  
  57. lock_option: {
  58.     ACCOUNT LOCK
  59.   | ACCOUNT UNLOCK
  60. }

The ALTER USER statement modifies MySQL accounts. It enables authentication, role, SSL/TLS, resource-limit, and password-management properties to be modified for existing accounts. It can also be used to lock and unlock accounts.

In most cases, ALTER USER requires the global CREATE USER privilege, or the UPDATE privilege for the mysql system database. The exceptions are:

  • Any client who connects to the server using a nonanonymous account can change the password for that account. (In particular, you can change your own password.) To see which account the server authenticated you as, invoke the CURRENT_USER() function:

    1. SELECT CURRENT_USER();

  • For DEFAULT ROLE syntax, ALTER USER requires these privileges:

    • Setting the default roles for another user requires the global CREATE USER privilege, or the UPDATE privilege for the mysql.default_roles system table.

    • Setting the default roles for yourself requires no special privileges, as long as the roles you want as the default have been granted to you.

  • Statements that modify secondary passwords require these privileges:

    • The APPLICATION_PASSWORD_ADMIN privilege is required to use the RETAIN CURRENT PASSWORD or DISCARD OLD PASSWORD clause for ALTER USER statements that apply to your own account. The privilege is required to manipulate your own secondary password because most users require only one password.

    • If an account is to be permitted to manipulate secondary passwords for all accounts, it should be granted the CREATE USER privilege rather than APPLICATION_PASSWORD_ADMIN.

When the read_only system variable is enabled, ALTER USER additionally requires the CONNECTION_ADMIN or SUPER privilege.

By default, an error occurs if you try to modify a user that does not exist. If the IF EXISTS clause is given, the statement produces a warning for each named user that does not exist, rather than an error.

Important

Under some circumstances, ALTER USER may be recorded in server logs or on the client side in a history file such as ~/.mysql_history, which means that cleartext passwords may be read by anyone having read access to that information. For information about the conditions under which this occurs for the server logs and how to control it, see Section 6.1.2.3, “Passwords and Logging”. For similar information about client-side logging, see Section 4.5.1.3, “mysql Client Logging”.

There are several aspects to the ALTER USER statement, described under the following topics:

ALTER USER Overview

For each affected account, ALTER USER modifies the corresponding row in the mysql.user system table to reflect the properties specified in the statement. Unspecified properties retain their current values.

Each account name uses the format described in Section 6.2.4, “Specifying Account Names”. The host name part of the account name, if omitted, defaults to '%'. It is also possible to specify CURRENT_USER or CURRENT_USER() to refer to the account associated with the current session.

For one syntax only, the account may be specified with the USER() function:

  1. ALTER USER USER() IDENTIFIED BY 'auth_string';

This syntax enables changing your own password without naming your account literally. (The syntax also supports the REPLACE, RETAIN CURRENT PASSWORD, and DISCARD OLD PASSWORD clauses described at ALTER USER Authentication Options.)

For ALTER USER syntaxes that permit an auth_option value to follow a user value, auth_option indicates how the account authenticates by specifying an account authentication plugin, credentials (for example, a password), or both. Each auth_option value applies only to the account named immediately preceding it.

Following the user specifications, the statement may include options for SSL/TLS, resource-limit, password-management, and locking properties. All such options are global to the statement and apply to all accounts named in the statement.

Example: Change an account's password and expire it. As a result, the user must connect with the named password and choose a new one at the next connection:

  1. ALTER USER 'jeffrey'@'localhost'
  2.   IDENTIFIED BY 'new_password' PASSWORD EXPIRE;

Example: Modify an account to use the sha256_password authentication plugin and the given password. Require that a new password be chosen every 180 days:

  1. ALTER USER 'jeffrey'@'localhost'
  2.   IDENTIFIED WITH sha256_password BY 'new_password'
  3.   PASSWORD EXPIRE INTERVAL 180 DAY;

Example: Lock or unlock an account:

  1. ALTER USER 'jeffrey'@'localhost' ACCOUNT LOCK;
  2. ALTER USER 'jeffrey'@'localhost' ACCOUNT UNLOCK;

Example: Require an account to connect using SSL and establish a limit of 20 connections per hour:

  1. ALTER USER 'jeffrey'@'localhost'
  2.   REQUIRE SSL WITH MAX_CONNECTIONS_PER_HOUR 20;

Example: Alter multiple accounts, specifying some per-account properties and some global properties:

  1. ALTER USER
  2.   'jeffrey'@'localhost'
  3.     IDENTIFIED BY 'jeffrey_new_password',
  4.   'jeanne'@'localhost',
  5.   'josh'@'localhost'
  6.     IDENTIFIED BY 'josh_new_password'
  7.     REPLACE 'josh_current_password'
  8.     RETAIN CURRENT PASSWORD
  9.   REQUIRE SSL WITH MAX_USER_CONNECTIONS 2
  10.   PASSWORD HISTORY 5;

The IDENTIFIED BY value following jeffrey applies only to its immediately preceding account, so it changes the password to 'jeffrey_new_password' only for jeffrey. For jeanne, there is no per-account value (thus leaving the password unchanged). For josh, IDENTIFIED BY establishes a new password ('josh_new_password'), REPLACE is specified to verify that the user issuing the ALTER USER statement knows the current password ('josh_current_password'), and that current password is also retained as the account secondary password. (As a result, josh can connect with either the primary or secondary password.)

The remaining properties apply globally to all accounts named in the statement, so for both accounts:

  • Connections are required to use SSL.

  • The account can be used for a maximum of two simultaneous connections.

  • Password changes cannot reuse any of the five most recent passwords.

Example: Discard the secondary password for josh, leaving the account with only its primary password:

  1. ALTER USER 'josh'@'localhost' DISCARD OLD PASSWORD;

In the absence of a particular type of option, the account remains unchanged in that respect. For example, with no locking option, the locking state of the account is not changed.

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ALTER USER Authentication Options

An account name may be followed by an auth_option authentication option that specifies the account authentication plugin, credentials, or both. It may also include a password-verification clause that specifies the account current password to be replaced, and clauses that manage whether an account has a secondary password.

Note

Clauses for password verification and secondary passwords apply only to accounts that store credentials internally in the mysql.user system table (mysql_native_password, sha256_password, or caching_sha2_password). For accounts that use plugins that perform authentication against an external credential system, password management must be handled externally against that system as well.

  • auth_plugin names an authentication plugin. The plugin name can be a quoted string literal or an unquoted name. Plugin names are stored in the plugin column of the mysql.user system table.

    For auth_option syntaxes that do not specify an authentication plugin, the default plugin is indicated by the value of the default_authentication_plugin system variable. For descriptions of each plugin, see Section 6.4.1, “Authentication Plugins”.

  • Credentials are stored in the mysql.user system table. An 'auth_string' value specifies account credentials, either as a cleartext (unencrypted) string or hashed in the format expected by the authentication plugin associated with the account, respectively:

    • For syntaxes that use BY 'auth_string', the string is cleartext and is passed to the authentication plugin for possible hashing. The result returned by the plugin is stored in the mysql.user table. A plugin may use the value as specified, in which case no hashing occurs.

    • For syntaxes that use AS 'auth_string', the string is assumed to be already in the format the authentication plugin requires, and is stored as is in the mysql.user table. If a plugin requires a hashed value, the value must be hashed in a format appropriate for the plugin. Otherwise, the value is not usable by the plugin and correct authentication of client connections will not occur.

      As of MySQL 8.0.17, a hashed string can be either a string literal or a hexadecimal value. The latter corresponds to the type of value displayed by SHOW CREATE USER for password hashes containing unprintable characters when the print_identified_with_as_hex system variable is enabled.

    • If an authentication plugin does not perform hashing of the authentication string, the BY 'auth_string' and AS 'auth_string' clauses have the same effect: Storage of the authentication string as is in the mysql.user system table.

  • The REPLACE 'current_auth_string' clause is available as of MySQL 8.0.13. If given:

    • REPLACE specifies the account current password to be replaced, as a cleartext (unencrypted) string.

    • The clause must be given if password changes for the are required to specify the current password, as verification that the user attempting to make the change actually knows the current password.

    • The clause is optional if password changes for the account may but need not specify the current password.

    • The statement fails if the clause is given but does not match the current password, even if the clause is optional.

    • REPLACE can be specified only when changing the account password for the current user.

    For more information about password verification by specifying the current password, see Section 6.2.15, “Password Management”.

  • The RETAIN CURRENT PASSWORD and DISCARD OLD PASSWORD clauses implement dual-password capability and are available as of MySQL 8.0.14. Both are optional, but if given, have the following effects:

    • RETAIN CURRENT PASSWORD retains an account current password as its secondary password, replacing any existing secondary password. The new password becomes the primary password, but clients can use the account to connect to the server using either the primary or secondary password. (Exception: If the new password specified by the ALTER USER statement is empty, the secondary password becomes empty as well, even if RETAIN CURRENT PASSWORD is given.)

    • If you specify RETAIN CURRENT PASSWORD for an account that has an empty primary password, the statement fails.

    • If an account has a secondary password and you change its primary password without specifying RETAIN CURRENT PASSWORD, the secondary password remains unchanged.

    • If you change the authentication plugin assigned to the account, the secondary password is discarded. If you change the authentication plugin and also specify RETAIN CURRENT PASSWORD, the statement fails.

    • DISCARD OLD PASSWORD discards the secondary password, if one exists. The account retains only its primary password, and clients can use the account to connect to the server only with the primary password.

    For more information about use of dual passwords, see Section 6.2.15, “Password Management”.

ALTER USER permits these auth_option syntaxes:

  • IDENTIFIED BY 'auth_string' [REPLACE 'current_auth_string'] [RETAIN CURRENT PASSWORD]

    Sets the account authentication plugin to the default plugin, passes the cleartext 'auth_string' value to the plugin for possible hashing, and stores the result in the account row in the mysql.user system table.

    The REPLACE clause, if given, specifies the account current password, as described previously in this section.

    The RETAIN CURRENT PASSWORD clause, if given, causes the account current password to be retained as its secondary password, as described previously in this section.

  • IDENTIFIED WITH auth_plugin

    Sets the account authentication plugin to auth_plugin, clears the credentials to the empty string (the credentials are associated with the old authentication plugin, not the new one), and stores the result in the account row in the mysql.user system table.

    In addition, the password is marked expired. The user must choose a new one when next connecting.

  • IDENTIFIED WITH auth_plugin BY 'auth_string' [REPLACE 'current_auth_string'] [RETAIN CURRENT PASSWORD]

    Sets the account authentication plugin to auth_plugin, passes the cleartext 'auth_string' value to the plugin for possible hashing, and stores the result in the account row in the mysql.user system table.

    The REPLACE clause, if given, specifies the account current password, as described previously in this section.

    The RETAIN CURRENT PASSWORD clause, if given, causes the account current password to be retained as its secondary password, as described previously in this section.

  • IDENTIFIED WITH auth_plugin AS 'auth_string'

    Sets the account authentication plugin to auth_plugin and stores the 'auth_string' value as is in the mysql.user account row. If the plugin requires a hashed string, the string is assumed to be already hashed in the format the plugin requires.

  • DISCARD OLD PASSWORD

    Discards the account secondary password, if there is one, as described previously in this section.

Example: Specify the password as cleartext; the default plugin is used:

  1. ALTER USER 'jeffrey'@'localhost'
  2.   IDENTIFIED BY 'password';

Example: Specify the authentication plugin, along with a cleartext password value:

  1. ALTER USER 'jeffrey'@'localhost'
  2.   IDENTIFIED WITH mysql_native_password
  3.              BY 'password';

Example: Like the preceding example, but in addition, specify the current password as a cleartext value to satisfy any account requirement that the user making the change knows that password:

  1. ALTER USER 'jeffrey'@'localhost'
  2.   IDENTIFIED WITH mysql_native_password
  3.              BY 'password'
  4.              REPLACE 'current_password';

The preceding statement fails unless the current user is jeffrey because REPLACE is permitted only for changes to the current user's password.

Example: Establish a new primary password and retain the existing password as the secondary password:

  1. ALTER USER 'jeffrey'@'localhost'
  2.   IDENTIFIED BY 'new_password'
  3.   RETAIN CURRENT PASSWORD;

Example: Discard the secondary password, leaving the account with only its primary password:

  1. ALTER USER 'jeffery'@'localhost' DISCARD OLD PASSWORD;

Example: Specify the authentication plugin, along with a hashed password value:

  1. ALTER USER 'jeffrey'@'localhost'
  2.   IDENTIFIED WITH mysql_native_password
  3.              AS '*6C8989366EAF75BB670AD8EA7A7FC1176A95CEF4';

For additional information about setting passwords and authentication plugins, see Section 6.2.14, “Assigning Account Passwords”, and Section 6.2.17, “Pluggable Authentication”.

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ALTER USER Role Options

ALTER USER ... DEFAULT ROLE defines which roles become active when the user connects to the server and authenticates, or when the user executes the SET ROLE DEFAULT statement during a session.

ALTER USER ... DEFAULT ROLE is alternative syntax for SET DEFAULT ROLE (see Section 13.7.1.9, “SET DEFAULT ROLE Syntax”). However, ALTER USER can set the default for only a single user, whereas SET DEFAULT ROLE can set the default for multiple users. On the other hand, you can specify CURRENT_USER as the user name for the ALTER USER statement, whereas you cannot for SET DEFAULT ROLE.

Each user account name uses the format described previously.

Each role name uses the format described in Section 6.2.5, “Specifying Role Names”. For example:

  1. ALTER USER 'joe'@'10.0.0.1' DEFAULT ROLE administrator, developer;

The host name part of the role name, if omitted, defaults to '%'.

The clause following the DEFAULT ROLE keywords permits these values:

  • NONE: Set the default to NONE (no roles).

  • ALL: Set the default to all roles granted to the account.

  • role [, role ] ...: Set the default to the named roles, which must exist and be granted to the account at the time ALTER USER ... DEFAULT ROLE is executed.

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ALTER USER SSL/TLS Options

MySQL can check X.509 certificate attributes in addition to the usual authentication that is based on the user name and credentials. For background information on the use of SSL/TLS with MySQL, see Section 6.3, “Using Encrypted Connections”.

To specify SSL/TLS-related options for a MySQL account, use a REQUIRE clause that specifies one or more tls_option values.

Order of REQUIRE options does not matter, but no option can be specified twice. The AND keyword is optional between REQUIRE options.

ALTER USER permits these tls_option values:

  • NONE

    Indicates that all accounts named by the statement have no SSL or X.509 requirements. Unencrypted connections are permitted if the user name and password are valid. Encrypted connections can be used, at the client's option, if the client has the proper certificate and key files.

    1. ALTER USER 'jeffrey'@'localhost' REQUIRE NONE;

    Clients attempt to establish a secure connection by default. For clients that have REQUIRE NONE, the connection attempt falls back to an unencrypted connection if a secure connection cannot be established. To require an encrypted connection, a client need specify only the --ssl-mode=REQUIRED option; the connection attempt fails if a secure connection cannot be established.

  • SSL

    Tells the server to permit only encrypted connections for all accounts named by the statement.

    1. ALTER USER 'jeffrey'@'localhost' REQUIRE SSL;

    Clients attempt to establish a secure connection by default. For accounts that have REQUIRE SSL, the connection attempt fails if a secure connection cannot be established.

  • X509

    For all accounts named by the statement, requires that clients present a valid certificate, but the exact certificate, issuer, and subject do not matter. The only requirement is that it should be possible to verify its signature with one of the CA certificates. Use of X.509 certificates always implies encryption, so the SSL option is unnecessary in this case.

    1. ALTER USER 'jeffrey'@'localhost' REQUIRE X509;

    For accounts with REQUIRE X509, clients must specify the --ssl-key and --ssl-cert options to connect. (It is recommended but not required that --ssl-ca also be specified so that the public certificate provided by the server can be verified.) This is true for ISSUER and SUBJECT as well because those REQUIRE options imply the requirements of X509.

  • ISSUER 'issuer'

    For all accounts named by the statement, requires that clients present a valid X.509 certificate issued by CA 'issuer'. If a client presents a certificate that is valid but has a different issuer, the server rejects the connection. Use of X.509 certificates always implies encryption, so the SSL option is unnecessary in this case.

    1. ALTER USER 'jeffrey'@'localhost'
    2.   REQUIRE ISSUER '/C=SE/ST=Stockholm/L=Stockholm/
    3.    O=MySQL/CN=CA/emailAddress=ca@example.com';

    Because ISSUER implies the requirements of X509, clients must specify the --ssl-key and --ssl-cert options to connect. (It is recommended but not required that --ssl-ca also be specified so that the public certificate provided by the server can be verified.)

  • SUBJECT 'subject'

    For all accounts named by the statement, requires that clients present a valid X.509 certificate containing the subject subject. If a client presents a certificate that is valid but has a different subject, the server rejects the connection. Use of X.509 certificates always implies encryption, so the SSL option is unnecessary in this case.

    1. ALTER USER 'jeffrey'@'localhost'
    2.   REQUIRE SUBJECT '/C=SE/ST=Stockholm/L=Stockholm/
    3.    O=MySQL demo client certificate/
    4.    CN=client/emailAddress=client@example.com';

    MySQL does a simple string comparison of the 'subject' value to the value in the certificate, so lettercase and component ordering must be given exactly as present in the certificate.

    Because SUBJECT implies the requirements of X509, clients must specify the --ssl-key and --ssl-cert options to connect. (It is recommended but not required that --ssl-ca also be specified so that the public certificate provided by the server can be verified.)

  • CIPHER 'cipher'

    For all accounts named by the statement, requires a specific cipher method for encrypting connections. This option is needed to ensure that ciphers and key lengths of sufficient strength are used. Encryption can be weak if old algorithms using short encryption keys are used.

    1. ALTER USER 'jeffrey'@'localhost'
    2.   REQUIRE CIPHER 'EDH-RSA-DES-CBC3-SHA';

The SUBJECT, ISSUER, and CIPHER options can be combined in the REQUIRE clause:

  1. ALTER USER 'jeffrey'@'localhost'
  2.   REQUIRE SUBJECT '/C=SE/ST=Stockholm/L=Stockholm/
  3.    O=MySQL demo client certificate/
  4.    CN=client/emailAddress=client@example.com'
  5.   AND ISSUER '/C=SE/ST=Stockholm/L=Stockholm/
  6.    O=MySQL/CN=CA/emailAddress=ca@example.com'
  7.   AND CIPHER 'EDH-RSA-DES-CBC3-SHA';

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ALTER USER Resource-Limit Options

It is possible to place limits on use of server resources by an account, as discussed in Section 6.2.20, “Setting Account Resource Limits”. To do so, use a WITH clause that specifies one or more resource_option values.

Order of WITH options does not matter, except that if a given resource limit is specified multiple times, the last instance takes precedence.

ALTER USER permits these resource_option values:

  • MAX_QUERIES_PER_HOUR count, MAX_UPDATES_PER_HOUR count, MAX_CONNECTIONS_PER_HOUR count

    For all accounts named by the statement, these options restrict how many queries, updates, and connections to the server are permitted to each account during any given one-hour period. If count is 0 (the default), this means that there is no limitation for the account.

  • MAX_USER_CONNECTIONS count

    For all accounts named by the statement, restricts the maximum number of simultaneous connections to the server by each account. A nonzero count specifies the limit for the account explicitly. If count is 0 (the default), the server determines the number of simultaneous connections for the account from the global value of the max_user_connections system variable. If max_user_connections is also zero, there is no limit for the account.

Example:

  1. ALTER USER 'jeffrey'@'localhost'
  2.   WITH MAX_QUERIES_PER_HOUR 500 MAX_UPDATES_PER_HOUR 100;

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ALTER USER Password-Management Options

ALTER USER supports several password_option values for password management:

  • Password expiration options: You can expire an account password manually and establish its password expiration policy. Policy options do not expire the password. Instead, they determine how the server applies automatic expiration to the account based on password age, which is assessed from the date and time of the most recent account password change.

  • Password reuse options: You can restrict password reuse based on number of password changes, time elapsed, or both.

  • Password verification-required options: You can indicate whether attempts to change an account password must specify the current password, as verification that the user attempting to make the change actually knows the current password.

This section describes the syntax for password-management options. For information about establishing policy for password management, see Section 6.2.15, “Password Management”.

If multiple password-management options of a given type (PASSWORD EXPIRE, PASSWORD HISTORY, PASSWORD REUSE INTERVAL, PASSWORD REQUIRE) are specified, the last one takes precedence.

Note

Password-management options apply only to accounts that store credentials internally in the mysql.user system table (mysql_native_password, sha256_password, or caching_sha2_password). For accounts that use plugins that perform authentication against an external credential system, password management must be handled externally against that system as well.

A client has an expired password if the account password was expired manually or the password age is considered greater than its permitted lifetime per the automatic expiration policy. In this case, the server either disconnects the client or restricts the operations permitted to it (see Section 6.2.16, “Server Handling of Expired Passwords”). Operations performed by a restricted client result in an error until the user establishes a new account password.

Note

Although it is possible to “reset” an expired password by setting it to its current value, it is preferable, as a matter of good policy, to choose a different password. DBAs can enforce non-reuse by establishing an appropriate password-reuse policy. See Password Reuse Policy.

ALTER USER permits these password_option values for controlling password expiration:

  • PASSWORD EXPIRE

    Immediately marks the password expired for all accounts named by the statement.

    1. ALTER USER 'jeffrey'@'localhost' PASSWORD EXPIRE;

  • PASSWORD EXPIRE DEFAULT

    Sets all accounts named by the statement so that the global expiration policy applies, as specified by the default_password_lifetime system variable.

    1. ALTER USER 'jeffrey'@'localhost' PASSWORD EXPIRE DEFAULT;

  • PASSWORD EXPIRE NEVER

    This expiration option overrides the global policy for all accounts named by the statement. For each, it disables password expiration so that the password never expires.

    1. ALTER USER 'jeffrey'@'localhost' PASSWORD EXPIRE NEVER;

  • PASSWORD EXPIRE INTERVAL N DAY

    This expiration option overrides the global policy for all accounts named by the statement. For each, it sets the password lifetime to N days. The following statement requires the password to be changed every 180 days:

    1. ALTER USER 'jeffrey'@'localhost' PASSWORD EXPIRE INTERVAL 180 DAY;

ALTER USER permits these password_option values for controlling reuse of previous passwords based on required minimum number of password changes:

  • PASSWORD HISTORY DEFAULT

    Sets all accounts named by the statement so that the global policy about password history length applies, to prohibit reuse of passwords before the number of changes specified by the password_history system variable.

    1. ALTER USER 'jeffrey'@'localhost' PASSWORD HISTORY DEFAULT;

  • PASSWORD HISTORY N

    This history-length option overrides the global policy for all accounts named by the statement. For each, it sets the password history length to N passwords, to prohibit reusing any of the N most recently chosen passwords. The following statement prohibits reuse of any of the previous 6 passwords:

    1. ALTER USER 'jeffrey'@'localhost' PASSWORD HISTORY 6;

ALTER USER permits these password_option values for controlling reuse of previous passwords based on time elapsed:

  • PASSWORD REUSE INTERVAL DEFAULT

    Sets all statements named by the account so that the global policy about time elapsed applies, to prohibit reuse of passwords newer than the number of days specified by the password_reuse_interval system variable.

    1. ALTER USER 'jeffrey'@'localhost' PASSWORD REUSE INTERVAL DEFAULT;

  • PASSWORD REUSE INTERVAL N DAY

    This time-elapsed option overrides the global policy for all accounts named by the statement. For each, it sets the password reuse interval to N days, to prohibit reuse of passwords newer than that many days. The following statement prohibits password reuse for 360 days:

    1. ALTER USER 'jeffrey'@'localhost' PASSWORD REUSE INTERVAL 360 DAY;

ALTER USER permits these password_option values for controlling whether attempts to change an account password must specify the current password, as verification that the user attempting to make the change actually knows the current password:

  • PASSWORD REQUIRE CURRENT

    This verification option overrides the global policy for all accounts named by the statement. For each, it requires that password changes specify the current password.

    1. ALTER USER 'jeffrey'@'localhost' PASSWORD REQUIRE CURRENT;

  • PASSWORD REQUIRE CURRENT OPTIONAL

    This verification option overrides the global policy for all accounts named by the statement. For each, it does not require that password changes specify the current password. (The current password may but need not be given.)

    1. ALTER USER 'jeffrey'@'localhost' PASSWORD REQUIRE CURRENT OPTIONAL;

  • PASSWORD REQUIRE CURRENT DEFAULT

    Sets all statements named by the account so that the global policy about password verification applies, as specified by the password_require_current system variable.

    1. ALTER USER 'jeffrey'@'localhost' PASSWORD REQUIRE CURRENT DEFAULT;

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ALTER USER Account-Locking Options

MySQL supports account locking and unlocking using the ACCOUNT LOCK and ACCOUNT UNLOCK options, which specify the locking state for an account. For additional discussion, see Section 6.2.19, “Account Locking”.

If multiple account-locking options are specified, the last one takes precedence.

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ALTER USER Binary Logging

ALTER USER is written to the binary log if it succeeds, but not if it fails; in that case, rollback occurs and no changes are made. A statement written to the binary log includes all named users. If the IF EXISTS clause is given, this includes even users that do not exist and were not altered.

If the original statement changes the credentials for a user, the statement written to the binary log specifies the applicable authentication plugin for that user, determined as follows:

  • The plugin named in the original statement, if one was specified.

  • Otherwise, the plugin associated with the user account if the user exists, or the default authentication plugin if the user does not exist. (If the statement written to the binary log must specify a particular authentication plugin for a user, include it in the original statement.)

If the server adds the default authentication plugin for any users in the statement written to the binary log, it writes a warning to the error log naming those users.


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