Slave is not configured or failed to initialize properly. You must at least set --server-id to enable either a master or a slave.
Additional error messages can be found in the MySQL error log. Cannot clean up worker info tables. Cannot discard the table. Failed to add the foreign key constaint. The password hash doesn't have the expected format. This is deprecated and will be disallowed in a future release. Dropping a primary key is not allowed without also adding a new primary key.
Instead, for each transaction that you want to skip, generate an empty transaction with the same GTID as the transaction. Your password has expired.
To log in you must change it using a client that supports expired passwords. Slave IO thread got the stop signal, thread is busy, IO thread will stop once the current task is complete. Operation cannot be performed. Upgrade index name failed, please use create index alter table algorithm copy to rebuild index.
Cannot execute statement because it needs to be written to the binary log as multiple statements, and this is not allowed when SESSION. This may indicate that the end of the binary log was truncated or that the last binary log file was lost, e. The master may or may not have rolled back transactions that were already replicated to the slave.
Query partially completed on the master error on master: There is a chance that your master is inconsistent at this point. Query caused different errors on master and slave.
Statement is unsafe because it uses a fulltext parser plugin which may not return the same value on the slave. This operation may not be safe when the slave has temporary tables. The tables will be kept open until the server restarts or until the tables are deleted by any replicated DROP statement. The old position value may not be valid for the new binary log file. Slave worker has stopped after at least one previous worker encountered an error when slave-preserve-commit-order was enabled.
To preserve commit order, the last transaction executed by this thread has not been committed. When restarting the slave after fixing any failed threads, you should fix this worker as well. Geometry values passed as arguments to spatial functions must have the same SRID value. A spatial function was called with a combination of argument types that the function does not support. A spatial function was called with an argument not recognized as a valid geometry value.
Geometry overlay calculation error: Geometry turn info calculation error: The password provided for the replication user exceeds the maximum length of 32 characters.
Multiple channels exist on the slave. Please provide channel name as an argument. It will be made read-only in a future release. It will be removed in a future release. Fix this as follows: The server is not configured properly to be an active member of the group. Please see more details on error log.
The applier thread got the stop signal while it was busy. The applier thread will stop once the current task is complete. When using Group Replication, this means that a transaction failed the group certification process, due to one or more members detecting a potential conflict, and was thus rolled back. To address this issue, change the table definition to define each generated column later than any generated columns to which it refers. You cannot drop or rename a generated column if another column refers to it.
You must either drop those columns as well, or redefine them not to refer to the generated column. This is a mysql internal system table to store GTIDs for committed transactions. Modifying it can lead to an inconsistent GTID state.
A locking service name was specified as NULL , the empty string, or a string longer than 64 characters. Namespace and lock names must be non- NULL , nonempty, and no more than 64 characters long. Deadlock found when trying to get locking service lock; try releasing locks and restarting lock acquisition. They will be merged with strict mode in a future release. A path expression must be encoded in the utf8 character set.
Qualifying connections are those using SSL, a Unix socket file, or shared memory. Choose a different storage engine. This error indicates that an audit plugin terminated execution of an event. The message typically indicates the event subclass name and a numeric status value.
Cannot create index on virtual column whose base column has foreign constraint. This is an internal system table used to store GTIDs for committed transactions. Although modifying it can lead to an inconsistent GTID state, if neccessary you can modify it with a non-XA transaction. Write to binlog failed. However, master key rotation has been completed successfully. Please check if a keyring plugin is installed and that provided arguments are valid for the keyring you are using.
It seems that your db schema is old. Cannot complete the operation because table is referenced by another connection. Please use native partitioning instead. The resource manager is not able to commit the transaction branch at this time. Connection using old pre Attempt to read a row while there is no result set associated with the statement.
The number of columns in the result set differs from the number of bound buffers. You must reset the statement, rebind the result set columns, and execute the statement again. This handle is already connected. Use a separate handle for each connection. An insecure function call was detected. Modify the application to use the suggested alternative function instead.
This section lists some common problems and error messages that you may encounter. It describes how to determine the causes of the problems and what to do to solve them.
When you run into a problem, the first thing you should do is to find out which program or piece of equipment is causing it:. If you have one of the following symptoms, then it is probably a hardware problems such as memory, motherboard, CPU, or hard disk or kernel problem:. The keyboard does not work. This can normally be checked by pressing the Caps Lock key. If the Caps Lock light does not change, you have to replace your keyboard.
Before doing this, you should try to restart your computer and check all cables to the keyboard. Other programs that are not related to MySQL do not behave correctly. Your system restarted unexpectedly. A faulty user-level program should never be able to take down your system. In this case, you should start by checking all your cables and run some diagnostic tool to check your hardware! You should also check whether there are any patches, updates, or service packs for your operating system that could likely solve your problem.
Check also that all your libraries such as glibc are up to date. It is always good to use a machine with ECC memory to discover memory problems early. If you do not think you have hardware problems, you should try to find out which program is causing problems. Try using top , ps , Task Manager, or some similar program, to check which program is taking all CPU or is locking the machine.
Use top , df , or a similar program to check whether you are out of memory, disk space, file descriptors, or some other critical resource. If the problem is some runaway process, you can always try to kill it. If it does not want to die, there is probably a bug in the operating system. If after you have examined all other possibilities and you have concluded that the MySQL server or a MySQL client is causing the problem, it is time to create a bug report for our mailing list or our support team.
In the bug report, try to give a very detailed description of how the system is behaving and what you think is happening. You should also state why you think that MySQL is causing the problem. Take into consideration all the situations in this chapter. State any problems exactly how they appear when you examine your system. Try to describe in detail which program is not working and all symptoms you see. Has the program in question made a segmentation fault did it dump core?
Is the program taking up all available CPU time? Let the program run for a while, it may simply be evaluating something computationally intensive.
If the mysqld server is causing problems, can you get any response from it with mysqladmin -u root ping or mysqladmin -u root processlist? What does a client program say when you try to connect to the MySQL server? Try with mysql , for example. Does the client jam? Do you get any output from the program? This section lists some errors that users frequently encounter when running MySQL programs. Although the problems show up when you try to run client programs, the solutions to many of the problems involves changing the configuration of the MySQL server.
An Access denied error can have many causes. Often the problem is related to the MySQL accounts that the server permits client programs to use when connecting. A Unix socket file is used if you do not specify a host name or if you specify the special host name localhost.
If the server is started with the --enable-named-pipe option, you can also connect with named pipes if you run the client on the host where the server is running. The name of the named pipe is MySQL by default. If you do not give a host name when connecting to mysqld , a MySQL client first tries to connect to the named pipe.
You can force the use of named pipes on Windows by using. The error Can't connect to The error Can't connect to MySQL server on ' server ' indicates that the network connection has been refused. You should check that there is a MySQL server running, that it has network connections enabled, and that the network port you specified is the one configured on the server.
Start by checking whether there is a process named mysqld running on your server host. Use ps xa grep mysqld on Unix or the Task Manager on Windows. If there is no such process, you should start the server. If a mysqld process is running, you can check it by trying the following commands. The port number or Unix socket file name might be different in your setup. Note the use of backticks rather than forward quotation marks with the hostname command; these cause the output of hostname that is, the current host name to be substituted into the mysqladmin command.
If you have no hostname command or are running on Windows, you can manually type the host name of your machine without backticks following the -h option. You can also try -h 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. Check to make sure that there is no firewall blocking access to MySQL.
Your firewall may be configured on the basis of the application being executed, or the port number used by MySQL for communication by default. Under Linux or Unix, check your IP tables or similar configuration to ensure that the port has not been blocked. Check your operating system's process list to ensure the mysqld process is present. If you're experiencing that quite often your clients get that error, you can find a workaround here: You can always run mysqladmin version to check whether the Unix socket file that mysqladmin is trying to use really exists.
The fix in this case is to change the cron job to not remove mysql. If you change the socket path name for the server, you must also notify the MySQL clients. You can do this by providing the same --socket option when you run client programs. You also need to ensure that clients have permission to access the mysql. To find out where the socket file is, you can do:.
You are using Linux and one server thread has died dumped core. In this case, you must kill the other mysqld threads for example, with kill before you can restart the MySQL server. The server or client program might not have the proper access privileges for the directory that holds the Unix socket file or the socket file itself.
In this case, you must either change the access privileges for the directory or socket file so that the server and clients can access them, or restart mysqld with a --socket option that specifies a socket file name in a directory where the server can create it and where client programs can access it. Change the value if your server is listening to a different port. If there is a MySQL server running and listening to the port, you should get a response that includes the server's version number.
If you get an error such as telnet: Unable to connect to remote host: Connection refused , then there is no server running on the given port. If the server is running on the local host, try using mysqladmin -h localhost variables to connect using the Unix socket file. This is because Internet routing can cause a packet to take a slow route to its destination and it may arrive after both sides have agreed to close. If the port is in use for a new connection, that packet from the old connection could break the protocol or compromise personal information from the original connection.
Windows permits ephemeral short-lived TCP ports to the user. The port will not be available again until this time expires. The default range of port numbers depends on the version of Windows, with a more limited number of ports in older versions:. Windows Vista, Server , and newer: Ports in range — There are two ways to address this problem:. Reduce the number of TCP ports consumed quickly by investigating connection pooling or persistent connections where possible.
The following procedure involves modifying the Windows registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore it if a problem occurs. For information about how to back up, restore, and edit the registry, view the following article in the Microsoft Knowledge Base: Start Registry Editor Regedt On the Edit menu, click Add Value , and then add the following registry value:.
This sets the number of ephemeral ports available to any user. The valid range is between and decimal. The default value is 0x decimal. The valid range is between 30 and decimal, although you may wish to check with Microsoft for the latest permitted values. The default value is 0x78 decimal.
Undoing the above should be as simple as deleting the registry entries you've created. Usually it indicates network connectivity trouble and you should check the condition of your network if this error occurs frequently.
More rarely, it can happen when the client is attempting the initial connection to the server. It will increase by one for each initial connection attempt that the server aborts.
The information in this section applies only before MySQL 5. The current implementation of the authentication protocol uses a password hashing algorithm that is incompatible with that used by older pre Attempts to connect to a 4.
To deal with this problem, the preferred solution is to upgrade all client programs to use a 4. If that is not possible, use one of the following approaches:. To connect to the server with a pre Reset the password to pre MySQL cannot tell you what the original password was, so you need to pick a new one. Tell the server to use the older password hashing algorithm by default:. Assign an old-format password to each account that has had its password updated to the longer 4.
You can identify these accounts with the following query:. For each account record displayed by the query, use the Host and User values and assign a password using one of the methods described previously. The Client does not support authentication protocol error also can occur if multiple versions of MySQL are installed but client programs are dynamically linked and link to an older library.
Make sure that clients use the most recent library version with which they are compatible. The procedure to do this will depend on your system. This is true regardless of the PHP version being used. If you wish to use the mysql extension with MySQL 4. For more information about the mysqli extension, see http: MySQL client programs prompt for a password when invoked with a --password or -p option that has no following password value:.
On some systems, you may find that your password works when specified in an option file or on the command line, but not when you enter it interactively at the Enter password: This occurs when the library provided by the system to read passwords limits password values to a small number of characters typically eight. That is a problem with the system library, not with MySQL. To work around it, change your MySQL password to a value that is eight or fewer characters long, or put your password in an option file.
If the following error occurs, it means that mysqld has received many connection requests from the given host that were interrupted in the middle:. By default, mysqld blocks a host after connection errors. If you get a Too many connections error when you try to connect to the mysqld server, this means that all available connections are in use by other clients. Previously, the default was If you need to support more connections, you should set a larger value for this variable.
The maximum number of connections MySQL supports depends on the quality of the thread library on a given platform, the amount of RAM available, how much RAM is used for each connection, the workload from each connection, and the desired response time.
Linux or Solaris should be able to support at least to simultaneous connections routinely and as many as 10, connections if you have many gigabytes of RAM available and the workload from each is low or the response time target undemanding.
Increasing open-files-limit may be necessary. If you issue a query using the mysql client program and receive an error like the following one, it means that mysql does not have enough memory to store the entire query result:.
To remedy the problem, first check whether your query is correct. Is it reasonable that it should return so many rows? If not, correct the query and try again. Otherwise, you can invoke mysql with the --quick option. This section also covers the related Lost connection to server during query error. The most common reason for the MySQL server has gone away error is that the server timed out and closed the connection.
In this case, you normally get one of the following error codes which one you get is operating system-dependent. By default, the server closes the connection after eight hours if nothing has happened. If you have a script, you just have to issue the query again for the client to do an automatic reconnection. This assumes that you have automatic reconnection in the client enabled which is the default for the mysql command-line client. Some other common reasons for the MySQL server has gone away error are:.
You or the db administrator has killed the running thread with a KILL statement or a mysqladmin kill command. You tried to run a query after closing the connection to the server. This indicates a logic error in the application that should be corrected.
A client application running on a different host does not have the necessary privileges to connect to the MySQL server from that host. This may happen if you have been using the commands: In this case increasing the timeout may help solve the problem. You have encountered a timeout on the server side and the automatic reconnection in the client is disabled the reconnect flag in the MYSQL structure is equal to 0. You can also get these errors if you send a query to the server that is incorrect or too large.
If mysqld receives a packet that is too large or out of order, it assumes that something has gone wrong with the client and closes the connection.
You may also need to increase the maximum packet size on the client end. You also get a lost connection if you are sending a packet 16MB or larger if your client is older than 4. It is also possible to see this error if host name lookups fail for example, if the DNS server on which your server or network relies goes down. This is because MySQL is dependent on the host system for name resolution, but has no way of knowing whether it is working—from MySQL's point of view the problem is indistinguishable from any other network timeout.
Another networking issue that can cause this error occurs if the MySQL port default is blocked by your firewall, thus preventing any connections at all to the MySQL server. You can also encounter this error with applications that fork child processes, all of which try to use the same connection to the MySQL server.
This can be avoided by using a separate connection for each child process. You have encountered a bug where the server died while executing the query. You can check whether the MySQL server died and restarted by executing mysqladmin version and examining the server's uptime. If the client connection was broken because mysqld crashed and restarted, you should concentrate on finding the reason for the crash.
Start by checking whether issuing the query again kills the server again. This logs some of the disconnection messages in the hostname.
If you want to create a bug report regarding this problem, be sure that you include the following information:. Indicate whether the MySQL server died. You can find information about this in the server error log. Have you tried to run mysqld with the general query log enabled to determine whether the problem query appears in the log? If you change a parameter value, when the change is applied is determined by the type of parameter.
Changes to dynamic parameters are applied immediately. Changes to static parameters require that the DB instance associated with DB parameter group be rebooted before the change takes effect.
To determine the type of a parameter, list the parameters in a parameter group using one of the procedures shown in the section Listing DB Parameter Groups. For example, if the DB instance is not using the latest changes to its associated DB parameter group, the RDS console shows the DB parameter group with a status of pending-reboot. You would need to manually reboot the DB instance for the latest parameter changes to take effect for that DB instance.
Change the values of the parameters you want to modify. You can scroll through the parameters using the arrow keys at the top right of the dialog box. Amazon RDS does not support passing multiple comma-delimited parameter values for a single parameter. You can copy custom DB parameter groups that you create. After you copy a DB parameter group, you should wait at least 5 minutes before creating your first DB instance that uses that DB parameter group as the default parameter group.
This allows Amazon RDS to fully complete the copy action before the parameter group is used as the default for a new DB instance.
You can use the Parameter Groups option of the Amazon RDS console or the describe-db-parameters command to verify that your DB parameter group has been created. You can't copy a default parameter group. However, you can create a new parameter group that is based on a default parameter group.
The following example creates a new DB parameter group named mygroup2 that is a copy of the DB parameter group mygroup1. Default parameter groups are automatically created from a default parameter template when you create a DB instance for a particular DB engine and version. These default parameter groups contain preferred parameter settings and cannot be modified. When you create a custom parameter group, you can modify parameter settings.
Click the name of the parameter group to see the its list of parameters. The following example lists the parameters and parameter values for a DB parameter group named mydbparametergroup. A DB parameter formula is an expression that resolves to an integer value, and is enclosed in braces: Formulas can be specified for either a DB parameter value or as an argument to a DB parameter function.
Returns the number of bytes of memory allocated to the DB instance class associated with the current DB instance, less the memory used by the Amazon RDS processes that manage the instance. Divides the dividend by the divisor, returning an integer quotient. Decimals in the quotient are truncated, not rounded. The parameter arguments can be specified as either integers or formulas. Each function must have at least one argument.
The server logs all statements that change data to the binary log, which is used for backup and replication.
The option value, if given, is the basename for the log sequence. The server creates binary log files in sequence by adding a numeric suffix to the basename. This is a known issue; see Bug for more information. The index file for binary log file names. If no argument is given, the option sets the variable to 1.
The options in the following list affect which statements are written to the binary log, and thus sent by a replication master server to its slaves. There are also options for slave servers that control which statements received from the master should be executed or ignored.
This option affects binary logging in a manner similar to the way that --replicate-do-db affects replication. The effects of this option depend on whether the statement-based or row-based logging format is in use, in the same way that the effects of --replicate-do-db depend on whether statement-based or row-based replication is in use. To specify multiple databases you must use multiple instances of this option.
Because database names can contain commas, the list will be treated as the name of a single database if you supply a comma-separated list. An example of what does not work as you might expect when using statement-based logging: It is also faster to check only the default database rather than all databases if there is no need.
Another case which may not be self-evident occurs when a given database is replicated even though it was not specified when setting the option.
Another important difference in --binlog-do-db handling for statement-based logging as opposed to the row-based logging occurs with regard to statements that refer to multiple databases. If you are using statement-based logging, the updates to both tables are written to the binary log. However, when using the row-based format, only the changes to table1 are logged; table2 is in a different database, so it is not changed by the UPDATE.
However, when using row-based logging, the change to table1 is logged, but not that to table2 —in other words, only changes to tables in the database named by --binlog-do-db are logged, and the choice of default database has no effect on this behavior. This option affects binary logging in a manner similar to the way that --replicate-ignore-db affects replication. The effects of this option depend on whether the statement-based or row-based logging format is in use, in the same way that the effects of --replicate-ignore-db depend on whether statement-based or row-based replication is in use.
The current database has no effect. When using statement-based logging, the following example does not work as you might expect. Because the sales database was specified explicitly in the statement, the statement has not been filtered.