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Although binary logging must be enabled on each host, replication sync_binlog=1 mysql not be configured, since Tungsten Replicator will be handling that process. The configured tungsten must sync_binlog=1 mysql able to read the Sync_binlog=1 mysql configuration file for installation and the binary logs.
Either the tungsten user should be a member of the appropriate group i. The following sync_binlog=1 mysql should be made to the [mysqld] section of your my. By default, MySQL is configured only to listen on the localhost address The bind-address parameter should be checked to ensure that it is either set to a valid value, or commented sync_binlog=1 mysql allow listening on all available network interfaces:.
Ensure that the maximum number of open files matches the configuration of the database user. This was configured earlier at files.
Tungsten Replicator operates by reading the binary logs on each machine, so logging must be enabled:. A value of zero indicates that the binary log should not be synchronized to disk, which implies that only standard operating system flushing of writes will occur. This can introduce a delay into writing information to the binary log, and therefore replication, but also opens the system to potential data loss if the binary log has not been flushed when a fatal system error occurs.
Setting a value of value 1 one will synchronize the binary log on disk after each event has been written. The replicator can apply statements up to the maximum size of a single transaction, sync_binlog=1 mysql the maximum allowed protocol packet size must be increase to support this:.
Tungsten Replicator needs to use a transaction safe storage engine to ensure the validity of the database. The InnoDB storage engine also provides automatic recovery in the sync_binlog=1 mysql of a failure. Using MyISAM can lead to sync_binlog=1 mysql corruption, and in the event of a switchover or failure, and sync_binlog=1 mysql state of the database, making it difficult to recover or restart replication effectively.
InnoDB should therefore be the default storage engine for all tables, and any existing tables should be converted to InnoDB before deploying Tungsten Replicator. Tungsten Replicator creates tables and must use InnoDB tables to store the status information for replication configuration and application:. The available values are:. A value of 0 zero provides the best performance, but it does so sync_binlog=1 mysql the potential risk of losing information in the event of a system or hardware failure.
A value of 1 one provides the best transaction stability sync_binlog=1 mysql ensuring that all writes to disk are flushed sync_binlog=1 mysql committed before the transaction is returned as complete.
Using this setting implies an increased disk load and so may impact the overall performance. A value of sync_binlog=1 mysql two ensures that transactions are committed to disk, but data loss may occur if the disk data is not flushed from any OS or hardware-based buffering before a hardware failure, but the disk overhead is much lower and provides higher performance.
MySQL configuration settings can be modified on a running cluster, providing you switch your host to maintenance mode before reconfiguring and restarting MySQL Server. Optional configuration changes that can be made to your MySQL configuration:.
Tungsten particularly depends on the page cache being stable when using parallel apply. There is one thread that scans forward over the THL pages to coordinate the channels and keep them from getting too far ahead. We then depend on those pages staying in cache for a while so that all sync_binlog=1 mysql channels can read them — as you are aware parallel apply works like a bunch of parallel table scans that are traveling like a school of sardines over the same part of the THL.
If pages get kicked out again before all the channels see them, parallel replication will start to serialize as it has to wait for the OS to read them back in again. If sync_binlog=1 mysql stay in memory on the other sync_binlog=1 mysql, the reads on the THL are in-memory, and fast. This should be increased to a larger file size, due to a known issue with xtrabackup during backup and restore operations.
To change the file size, read the corresponding information in the MySQL manual for configuring the file size information. Tungsten Replicator works with both statement and row-based logging, and therefore also mixed-based logging. The chosen format is entirely up to the systems and preferences, and there are no differences or changes required for Tungsten Replicator to operate. Depending on the exact use case and deployment, different binary log formats imply different requirements and settings.
Certain deployment types and environments require different settings:. For multi-master deployment, use row-based logging. This will help to avoid data drift where statements make fractional changes to the data in place of explicit updates. Use row-based logging for heterogeneous deployments.
Use mixed replication if warnings are raised within the MySQL log indicating that statement only is transferring possibly dangerous statements. Use statement or mixed replication for sync_binlog=1 mysql that update many rows; this reduces the size of the binary log and improves the sync_binlog=1 mysql when the transaction are applied on the slave.
Use row replication for transactions that have temporary tables. Temporary tables are replicated if sync_binlog=1 mysql or mixed based logging is in sync_binlog=1 mysql, and use of temporary tables can stop replication as the table sync_binlog=1 mysql unavailable between transactions.
Using row-based logging also sync_binlog=1 mysql these tables entering the binary log, which means they do not clog and delay replication.
The configuration of the MySQL server can be permanently changed to sync_binlog=1 mysql an explicit replication by modifying the configuration in the configuration file:. For temporary changes sync_binlog=1 mysql execution of explicit statements, the binlog format can be changed by executing the following statement:.
Ensure the tungsten user can access the MySQL binary logs by either opening up the directory permissions, or adding the tungsten user to the group owner for the directory.
It is possible to use users with a lower-privilege level and without as many rights. The tungsten user connects to the MySQL database and applies the data sync_binlog=1 mysql the replication stream from other datasources in the dataservice. The user must therefore be able execute any SQL statement on the server, including grants for other users. The user must have the following privileges in addition sync_binlog=1 mysql privileges for sync_binlog=1 mysql, updating and sync_binlog=1 mysql DDL and data within the database:.
SUPER privilege is required so that the user can perform all administrative operations including setting global variables. The connection will be made from the host to the local MySQL sync_binlog=1 mysql.
You may also need to create an explicit entry for this connection. Sync_binlog=1 mysql example, on the host host1create the user sync_binlog=1 mysql an explicit host reference:. If you later change the cluster configuration and add more hosts, you will need to update this configuration with each new host in the cluster. In some situations, this level sync_binlog=1 mysql access is not available within the MySQL environment, for example, when using a server that is heavily secured, or Amazon's RDS service.
For this situation, the Tungsten Replicator can be configured to use an 'unprivileged' sync_binlog=1 mysql configuration. This configuration does not require the SUPER privilege, sync_binlog=1 mysql instead needs explicit privileges on the schema created by Tungsten Replicator, and on the schemas that it sync_binlog=1 mysql update when applying events.
A master replicator will not attempt to suppress binlog writes during operations. The tungsten user must that connects to the database must be configured to work with the MySQL service using the following grants:. Communities Support Blogs Downloads Search: The JSON datatype is not supported. The bind-address parameter should be checked to ensure that it is either set to a valid value, or commented to sync_binlog=1 mysql listening on all available network interfaces: The available values are: Binary Logging Format Tungsten Replicator works with both statement and row-based logging, and therefore also mixed-based logging.
Certain deployment types and environments require different settings: Tungsten User Login It is possible to use users with a lower-privilege level and without as many rights. The user must have the following privileges in addition to privileges for creating, updating and deleting DDL and data within the database: Note If you later change the cluster configuration and add more hosts, you will need to update this configuration with each new host in the cluster.
Statement and row based replication sync_binlog=1 mysql supported.