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New component services now enable server components and plugins to query within the local server. The new MySQL command services are similar to C API functions in libmysql, except they do not expose protocol internals to the client. For information about these services, see the MySQL Server Doxygen documentation, available at -other.html. Search for:
MySQL Keyring previously implemented Oracle Cloud Infrastructure Vault Keyring keystore capabilities using a server plugin, but now is transitioning to use the MySQL component infrastructure. The new keyring component has similarities to the existing keyring_oci plugin, but is configured differently and can access keys that were created using the keyring_oci plugin when a similar set of configuration options are used to initialize the new component. For configuration details, see Using the Oracle Cloud Infrastructure Vault Keyring Component.
During startup, the server determines which keyring component to load using a manifest file, and the loaded component consults its own configuration file when it initializes. See Keyring Component Installation.
It is now possible to set a column histogram to a user-specified JSON value. This can be useful when sampling leaves out important values. This also means that a secondary (replica) MySQL server can assume the work of sampling the data and building the histogram, which can then be used on the primary (source) without impacting its performance.
The TP_CONNECTION_ADMIN privilege enables a user to access the server with a privileged connection. When the limit defined by thread_pool_max_transactions_limit has been reached, new connections cannot access the server. A privileged connection ignores the limit defined by thread_pool_max_transactions_limit and permits connecting to the server to increase the transaction limit, remove the limit, or kill running transactions.
Added the read-only build_id system variable. On Linux systems, a 160-bit SHA1 signature is generated at compile time; this value, converted to a hexadecimal string, provides a unique identifier for the build. This value is written in the server log at startup.
Replication: It was possible in some rare instances of flushing or synchronization errors for the server to attempt an update of the endpoint of the binary log using invalid values for both the file and position within the file, leading to undefined behavior.
Group Replication: A deadlock could occur when Group Replication was started on a server instance, but errors such as incompatible configuration caused the member to leave immediately. The service registry now manages the registration and deregistration of services by an alternative process that avoids the issue. (Bug #34194893)
Group Replication: In an InnoDB ClusterSet, in the event of a commit order deadlock and subsequent retry, Group Replication could roll back a transaction during certification with an error stating that the GTID for the transaction had already been used. The error is now only returned if the GTID has been used on the server instance as well as in the group. (Bug #34157846)
When the system variable replication_optimize_for_static_plugin_config was enabled to improve performance for semisynchronous replication, the RAPID plugin could not be used in the server due to issues with notification handling. The issue has now been fixed. (Bug #34549470)
If a MySQL instance at MySQL 8.0.27 or above joined a replication group running at MySQL 8.0.26, the member action mysql_start_failover_channels_if_primary was removed to match the member actions configuration for to the rest of the group. However, if the instances were upgraded to run at MySQL 8.0.27 or above, the member action was not reinstated unless group_replication_reset_member_actions() was issued on a server that then bootstrapped the group. Joining members now check if the member action mysql_start_failover_channels_if_primary is available to them, and add it to their member actions configuration if it is. (Bug #34464526)
Following changes to connection error handling in MySQL 8.0.24, if an error such as exceeding max_allowed_packet caused the mysql client to disconnect from the server, the error was not reset afterwards to indicate the disconnect. On subsequent queries, the original error was returned, and automatic reconnection did not take place because the mysql client did not have a disconnection error. The error is now reset to indicate disconnection and allow clients to reconnect. (Bug #107605, Bug #34303841)
The alternative for the deprecated --ssl=off server option to disable the use of encrypted connections was not working as documented, or as presented in the deprecation warning. Setting the tls_version system variable to the empty value (tls_version='') now works correctly for this purpose. (Bug #106459, Bug #33858646)
Make sure that the server is running. If it is not, clients cannot connect to it. For example, if an attempt to connect to the server fails with a message such as one of those following, one cause might be that the server is not running:
It might be that the server is running, but you are trying to connect using a TCP/IP port, named pipe, or Unix socket file different from the one on which the server is listening. To correct this when you invoke a client program, specify a --port option to indicate the proper port number, or a --socket option to indicate the proper named pipe or Unix socket file. To find out where the socket file is, you can use this command:
Make sure that the server has not been configured to ignore network connections or (if you are attempting to connect remotely) that it has not been configured to listen only locally on its network interfaces. If the server was started with the skip_networking system variable enabled, no TCP/IP connections are accepted. If the server was started with the bind_address system variable set to 127.0.0.1, it listens for TCP/IP connections only locally on the loopback interface and does not accept remote connections.
To determine whether you need to initialize the grant tables, look for a mysql directory under the data directory. (The data directory normally is named data or var and is located under your MySQL installation directory.) Make sure that you have a file named user.MYD in the mysql database directory. If not, initialize the data directory. After doing so and starting the server, you should be able to connect to the server.
You can use a --host=127.0.0.1 option to name the server host explicitly. This causes a TCP/IP connection to the local mysqld server. You can also use TCP/IP by specifying a --host option that uses the actual host name of the local host. In this case, the host name must be specified in a user table row on the server host, even though you are running the client program on the same host as the server.
If the following error occurs when you try to connect from a host other than the one on which the MySQL server is running, it means that there is no row in the user table with a Host value that matches the client host:
If you specify a host name when trying to connect, but get an error message where the host name is not shown or is an IP address, it means that the MySQL server got an error when trying to resolve the IP address of the client host to a name:
On Windows, if you are running the server and the client on the same machine and the server supports named pipe connections, connect to the host name . (period). Connections to . use a named pipe rather than TCP/IP.
If mysql -u user_name works when executed on the server host, but mysql -h host_name -u user_name does not work when executed on a remote client host, you have not enabled access to the server for the given user name from the remote host.
If you are able to connect to the MySQL server, but get an Access denied message whenever you issue a SELECT ... INTO OUTFILE or LOAD DATA statement, your row in the user table does not have the FILE privilege enabled.
If you change the grant tables directly (for example, by using INSERT, UPDATE, or DELETE statements) and your changes seem to be ignored, remember that you must execute a FLUSH PRIVILEGES statement or a mysqladmin flush-privileges command to cause the server to reload the privilege tables. Otherwise, your changes have no effect until the next time the server is restarted. Remember that after you change the root password with an UPDATE statement, you do not need to specify the new password until after you flush the privileges, because the server does not know until then that you have changed the password.
If you have access problems with a Perl, PHP, Python, or ODBC program, try to connect to the server with mysql -u user_name db_name or mysql -u user_name -ppassword db_name. If you are able to connect using the mysql client, the problem lies with your program, not with the access privileges. (There is no space between -p and the password; you can also use the --password=password syntax to specify the password. If you use the -p or --password option with no password value, MySQL prompts you for the password.)
For testing purposes, start the mysqld server with the --skip-grant-tables option. Then you can change the MySQL grant tables and use the SHOW GRANTS statement to check whether your modifications have the desired effect. When you are satisfied with your changes, execute mysqladmin flush-privileges to tell the mysqld server to reload the privileges. This enables you to begin using the new grant table contents without stopping and restarting the server.
This guide will show you how to make a secure connection to your remote MySQL or MariaDB server from your local computer, using an SSH tunnel. This is useful if you want to use administration tools on your local computer to do work on your server.
MySQL-Front is a Windows front end for MySQL database server. It allows you to connect to database sources or import Text, SQL, MS Excel, MS Access, and ODBC files. Dialog based data handling simplifies the editing process; SQL commands can also be run by experienced users. The database server can be connected directly or via HTTP tunneling. 2b1af7f3a8