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The MySQL server maintains many system variables that configure its operation. Each system variable has a default value. System variables can be set at server startup using options on the command line or in an option file. Most of them can be changed dynamically at runtime using the SET statement, which enables you to modify operation of the server without having to stop and restart it.

You can also use system variable values in expressions. Setting a session system variable value normally requires no special privileges and can be done by any user, although there are exceptions. For more information, see Section 5.

To see the values that a server uses based on its compiled-in defaults and any option files that it reads, use this command:. To see the values that a server uses based on only its compiled-in defaults, ignoring the settings in any option files, use this command:. See Section This section provides a description of each system variable. For a system variable summary table, see Section 5. For more information about manipulation of system variables, see Section 5.

Section 5. Information on tuning system variables can be found in Section 5. Section For information on server system variables specific to replication, see Section See Section 4. Some system variables control the size of buffers or caches. For a given buffer, the server might need to allocate internal data structures.

These structures typically are allocated from the total memory allocated to the buffer, and the amount of space required might be platform dependent. This means that when you assign a value to a system variable that controls a buffer size, the amount of space actually available might differ from the value assigned.

In some cases, the amount might be less than the value assigned. It is also possible for the server to adjust a value upward.

For example, if you assign a value of 0 to a variable for which the minimal value is , the server sets the value to Values for buffer sizes, lengths, and stack sizes are given in bytes unless otherwise specified.

Some system variables take file name values. Unless otherwise specified, the default file location is the data directory if the value is a relative path name. To specify the location explicitly, use an absolute path name. If the value is an absolute path name, its location is as given by the path name. See Section 6. This variable sets the logging level for the Windows authentication plugin. The following table shows the permitted values. A client that authenticates using the InitSecurityContext function should provide a string identifying the service to which it connects targetName.

This UPN is sent by the server at the beginning of authentication handshake. This variable controls whether the server sends the UPN in the initial challenge. By default, the variable is enabled. For security reasons, it can be disabled to avoid sending the server's account name to a client as cleartext. If the variable is disabled, the server always sends a 0x00 byte in the first challenge, the client does not specify targetName , and as a result, NTLM authentication is used. The autocommit mode.

If set to 1, all changes to a table take effect immediately. By default, client connections begin with autocommit set to 1. To set the variable using an option file, include these lines:. The server also automatically drops those privileges from the creator when the routine is dropped. See also Section It controls whether the server autogenerates SSL key and certificate files in the data directory, if they do not already exist.

These files enable secure client connections using SSL; see Section 6. For more information about SSL file autogeneration, including file names and characteristics, see Section 6. Upgrading such columns requires a table rebuild, which prevents any use of fast alterations that might otherwise apply to the operation to be performed. This variable is disabled by default. This variable is deprecated; expect it to be removed in a future release of MySQL.

The number of outstanding connection requests MySQL can have. This comes into play when the main MySQL thread gets very many connection requests in a very short time. It then takes some time although very little for the main thread to check the connection and start a new thread.

You need to increase this only if you expect a large number of connections in a short period of time. Your operating system has its own limit on the size of this queue.

The manual page for the Unix listen system call should have more details. Check your OS documentation for the maximum value for this variable. The default value is based on the following formula, capped to a limit of If enabled, the server stores all temporary tables on disk rather than in memory.

The default value for new connections is OFF use in-memory temporary tables. Normally, it should never be necessary to enable this variable because the server is able to handle large result sets automatically by using memory for small temporary tables and switching to disk-based tables as required.

This socket is bound to a single address, but it is possible for an address to map onto multiple network interfaces. If addr is a host name, the server resolves the name to an IP address and binds to that address. If a host name resolves to multiple IP addresses, the server uses the first IPv4 address if there are any, or the first IPv6 address otherwise.

Use this address to permit both IPv4 and IPv6 connections on all server interfaces. This value is the default. If the address is 0. For example, if the server is bound to ::ffff If binding to the address fails, the server produces an error and does not start. If you intend to bind the server to a specific address, be sure that the mysql.

Otherwise, you cannot shut down the server. But if you bind the server to , it accepts connections only on that address. In that case, first make sure that the 'root' '' account is present in the mysql. This variable has no effect for the embedded server libmysqld and is not visible within the embedded server. This variable controls the block encryption mode for block-based algorithms such as AES.

The value is not case-sensitive. Permitted keylen values are , , and This variable limits the size of the cache tree in bytes per thread. Setting it to 0 disables this optimization. The default value is 8MB. The character set for statements that arrive from the client. The session value of this variable is set using the character set requested by the client when the client connects to the server. Many clients support a --default-character-set option to enable this character set to be specified explicitly.

The global value of the variable is used to set the session value in cases when the client-requested value is unknown or not available, or the server is configured to ignore client requests:. The client requests a character set not known to the server.

For example, a Japanese-enabled client requests sjis when connecting to a server not configured with sjis support. This reproduces MySQL 4. Some character sets cannot be used as the client character set. See Impermissible Client Character Sets. The character set used for literals specified without a character set introducer and for number-to-string conversion. For information about introducers, see Section The character set used by the default database. The server sets this variable whenever the default database changes.

You should expect the session variables to become read only in a future version of MySQL and assignments to produce an error, while remaining possible to access the session variables to determine the database character set and collation for the default database. The file system character set. The default value is binary , which means that no conversion occurs.

For systems on which multibyte file names are permitted, a different value may be more appropriate. The character set used for returning query results to the client.