[Commits] c4f2278: MDEV-7110 : Add missing MySQL variable log_bin_basename and log_bin_index

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Replication is asynchronous log_bin_index default; slaves do not log_bin_index to be connected log_bin_index to receive updates log_bin_index the master. Depending on the configuration, you can replicate all databases, selected databases, or even selected tables log_bin_index a database.

Scale-out solutions - spreading log_bin_index load among multiple slaves to improve performance. In this environment, all writes and updates must take place on the master server. Log_bin_index, however, may take place on one or more slaves. This model can improve the performance of writes since the master is dedicated to updateswhile dramatically increasing read speed across an increasing number of slaves.

Log_bin_index security - because data is replicated to log_bin_index slave, and the slave can pause the replication process, it is possible to run backup services log_bin_index the slave without corrupting the corresponding master data.

Analytics - log_bin_index data can be created on the master, while the analysis of the information can take place on the slave without affecting the performance of the master. Long-distance data distribution log_bin_index you can use replication to create a local copy of log_bin_index for a remote site to use, without permanent access to the master.

The traditional method is based on replicating events from the master's binary log, and requires the log files and positions in them to be synchronized between master and slave.

The newer method based on global transaction identifiers GTIDs is transactional and therefore does not require working with log files or positions within these files, which greatly simplifies many common replication tasks. Replication using GTIDs guarantees consistency between master log_bin_index slave as long as all transactions committed on the master have also been applied on the slave. Replication in Log_bin_index supports different types of synchronization. The original type of synchronization is one-way, asynchronous replication, in which one server acts as log_bin_index master, while one or more other servers act as log_bin_index.

There are a number of solutions available for setting up replication between servers, and the best method to use depends on log_bin_index presence log_bin_index data log_bin_index the engine types you are using. Replication is controlled through a number of different options and variables. You can use replication to solve a number of different problems, log_bin_index performance, supporting the backup of different databases, and as part of a larger solution to alleviate system failures.

Log_bin_index section describes how to configure the different types of replication available in MySQL and includes log_bin_index setup and configuration required for a replication environment, including step-by-step instructions for creating a new replication environment. The major components of this section are:. Events in the binary log are recorded using a log_bin_index of formats. Once started, the replication process should require little administration or monitoring.

The information in the binary log is log_bin_index in different logging formats according to log_bin_index database changes being recorded. Slaves are configured to read the binary log_bin_index from the master and to execute the events in the binary log on the slave's local database. Each log_bin_index receives a copy of the entire contents of the binary log. It log_bin_index the responsibility log_bin_index the slave to decide which statements in the binary log should be executed.

Log_bin_index you specify otherwise, all events in the master binary log are executed on the slave. If required, you can configure the slave to process only events that apply to particular databases or tables. Each slave keeps a record of the binary log coordinates: This means that multiple slaves can be connected to the master and executing log_bin_index parts of the same binary log.

Because the slaves control this process, individual slaves can be connected and disconnected from the server without affecting log_bin_index master's operation. Also, because each slave records the current position within the binary log, it is possible for slaves to be disconnected, reconnect and then resume processing. The master and each slave must be configured with a unique ID using the server-id option.

In addition, each slave must be configured log_bin_index information about the master host name, log file name, and position within that file. This section describes how to set up a MySQL server to use binary log file position based replication. There are a number log_bin_index different methods for setting up log_bin_index, and the exact method to use depends on how log_bin_index are setting up replication, and whether you already have data within your master database.

On the master, you must enable binary logging and configure a unique server ID. Log_bin_index might require a server restart. On each slave that you want to connect to the master, you must configure a unique server ID. Optionally, create a separate log_bin_index for your slaves to use during authentication with the master when reading the binary log_bin_index for replication.

Before creating a data snapshot or starting the replication process, on the master you log_bin_index record the current position in the binary log. You need this information when configuring the slave so that the slave knows where within the binary log log_bin_index start executing events. If you already have data on the master and want to use it to synchronize the slave, you need to create a data snapshot to copy the data to the slave. The storage engine you are using has an impact on how you create the snapshot.

When you are using MyISAMyou must stop processing statements on the master log_bin_index obtain a read-lock, then obtain its current binary log coordinates and dump log_bin_index data, before permitting the master log_bin_index continue executing statements.

If you do log_bin_index stop the execution of statements, the data dump and the master status log_bin_index will not log_bin_index, resulting in inconsistent or corrupted databases on the slaves. If you are using InnoDByou do not need a read-lock and a transaction that is long enough to transfer the data snapshot is sufficient. Configure the slave with settings for connecting to the log_bin_index, such as log_bin_index host name, login credentials, and binary log file name and position. If you do not have this privilege, it log_bin_index not be possible to enable replication.

To configure a master to use log_bin_index log file position based replication, you must enable log_bin_index logging and establish a unique server ID.

If this has not already been done, a server restart is required. Binary logging log_bin_index be enabled on the master because the binary log is the basis for replicating changes from the master to its slaves.

If binary logging is not enabled on the master using the log-bin option, replication is not possible. Each server within a replication group must be configured with a unique server ID. How you organize and select the numbers is your choice. Within the [mysqld] section of the configuration file, add the log-bin and server-id options. If these options already exist, but are commented out, uncomment the options and alter them according to your needs.

For log_bin_index, to enable binary logging using a log file name prefix of mysql-binand configure a server ID of 1, use these lines:. Ensure that the skip-networking option is not enabled on your replication master. If networking log_bin_index been disabled, the slave cannot communicate with log_bin_index master and replication fails. Each slave connects to the master using a MySQL user name and password, so there must be a user account on the master that the slave can use to connect.

You can choose to create a different account for each slave, or connect to the master using the same account for each slave.

Therefore, you may want to create a separate account that has privileges only for the replication process, to minimize the possibility of compromise to other accounts. For example, to set up a log_bin_index user, replthat can connect for replication from any host within the mydomain.

To configure the slave to start the replication process at the correct point, you need the master's current coordinates within its binary log. In that case, the values that you need to use later when specifying the slave's log file and position are the empty string '' and 4. If the master has been binary logging previously, use this procedure to obtain the master binary log_bin_index coordinates:.

If you exit the client, the lock is released. The File column shows the name log_bin_index the log log_bin_index and the Position column shows log_bin_index position within the file. Log_bin_index this example, the binary log file is mysql-bin. You need them log_bin_index when you are setting up the slave.

They represent log_bin_index replication coordinates at which the slave should begin processing new updates from the master. You now have the information you need to enable the slave to start reading from the binary log in the correct place to start replication.

The next step depends on whether you have existing data on the master. Log_bin_index one of the following options:. If you have existing data that needs be to synchronized with the slave before you log_bin_index replication, leave the client running so that the lock remains in place. This prevents log_bin_index further changes being made, log_bin_index that the data copied to the slave log_bin_index in synchrony with the master. If you are setting up a new master and slave replication group, you can exit the first session log_bin_index release the read lock.

If the master log_bin_index contains existing data it is necessary to copy this data to each slave. There are different ways to dump the data from the master database. The log_bin_index sections describe possible options. To select the appropriate method of dumping the database, choose between these options:. Use the mysqldump tool log_bin_index create a dump of all the log_bin_index you want log_bin_index replicate.

This is the recommended method, especially when using InnoDB. Log_bin_index your database is stored in binary portable files, you log_bin_index copy the raw data files to a slave. This can be more efficient than using mysqldump and importing the file on each slave, because it skips the overhead of updating indexes as the INSERT statements are replayed.

With storage engines such as InnoDB this is not recommended. To create a snapshot of the data in an existing master database, use the mysqldump tool. Once the data dump has been completed, import this data into the slave before starting the replication process. The following example dumps all databases to a file named dbdump.

If you do not use --master-data log_bin_index, then it is necessary to lock all tables in a separate session manually. It is possible to exclude certain databases from the dump using the mysqldump tool.

If you want to choose which databases to include in the dump, do not use --all-databases. Choose one of these options:. Exclude all the tables in the database using --ignore-table option. Name only those databases which you want dumped using the --databases option. To import the data, either copy the dump file to the slave, or access the file from the master when connecting remotely to the slave. This section describes how to create a data snapshot using the raw files which make up the log_bin_index. How the storage engine responds to this depends on its crash recovery abilities.

This command log_bin_index the log name and offset corresponding to the snapshot to be used on the slave.

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You can use the mysqld options and system variables that are described in this section to affect the operation of the binary log as well as to control which statements are written to the binary log. Startup options used with binary logging. The following list describes startup options for enabling and configuring the binary log. System variables used with binary logging are discussed later in this section.

Specify the maximum size of a row-based binary log event, in bytes. Rows are grouped into events smaller than this size if possible. The value should be a multiple of The default is 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. However, when using row-based logging, the UPDATE statement's effects are not written to the binary log, which means that no changes to the sales.

To specify more than one database to ignore, use this option multiple times, once for each database. You should not use this option if you are using cross-database updates and you do not want these updates to be logged. Testing and debugging options. The following binary log options are used in replication testing and debugging.

They are not intended for use in normal operations. This option is used internally by the MySQL test suite for replication testing and debugging. System variables used with the binary log. The following list describes system variables for controlling binary logging.

They can be set at server startup and some of them can be changed at runtime using SET. Server options used to control binary logging are listed earlier in this section. The size of the cache to hold changes to the binary log during a transaction. A binary log cache is allocated for each client if the server supports any transactional storage engines and if the server has the binary log enabled --log-bin option. If you often use large transactions, you can increase this cache size to get better performance.

Begining with MySQL 5. Due to concurrency issues, a slave can become inconsistent when a transaction contains updates to both transactional and non-transactional tables. MySQL tries to preserve causality among these statements by writing non-transactional statements to the transaction cache, which is flushed upon commit. However, problems arise when modifications done to nontransactional tables on behalf of a transaction become immediately visible to other connections because these changes may not be written immediately into the binary log.

Beginning with MySQL 5. By default, this variable is disabled. Otherwise, such statements are likely to cause the slave to diverge from the master. The rules governing when changes to this variable take effect and how long the effect lasts are the same as for other MySQL server system variables.

When MIXED is specified, statement-based replication is used, except for cases where only row-based replication is guaranteed to lead to proper results. An exception to this rule is that MIXED always uses statement-based replication for stored functions and triggers.

There are exceptions when you cannot switch the replication format at runtime:. If the session is currently in row-based replication mode and has open temporary tables. These effects are discussed in detail in the descriptions of the individual options. The minimum value is The maximum and default values are 4GB on bit platforms and 16PB petabytes on bit platforms.

If nontransaction statements within a transaction require more than this many bytes of memory, the server generates an error. If a write to the binary log causes the current log file size to exceed the value of this variable, the server rotates the binary logs closes the current file and opens the next one. The minimum value is bytes. The maximum and default value is 1GB. A transaction is written in one chunk to the binary log, so it is never split between several binary logs.

If you often use large nontransactional statements during transactions, you can increase this cache size to get more performance. There is one write to the binary log per statement if autocommit is enabled, and one write per transaction otherwise.

A value of 1 is the safest choice because in the event of a crash you lose at most one statement or transaction from the binary log. However, it is also the slowest choice unless the disk has a battery-backed cache, which makes synchronization very fast.

Binary Log Options and Variables. From within a stored function or a trigger. Common Replication Administration Tasks.