How does MySQL Binlog work?
Whenever the master’s database is modified, the change is written to a file, the so-called binary log, or binlog. This is done by the client thread that executed the query that modified the database. The master has a thread, called the dump thread, that continuously reads the master’s binlog and sends it to the slave.
What is the purpose of binary log?
The purpose of the binary log is to allow replication, where data is sent from one or more masters to one or more slave servers based on the contents of the binary log, as well as assisting in backup operations. A MariaDB server with the binary log enabled will run slightly more slowly.
What is Binlog format in MySQL?
You can select the binary logging format explicitly by starting the MySQL server with –binlog-format= type . The supported values for type are: STATEMENT causes logging to be statement based. ROW causes logging to be row based. MIXED causes logging to use mixed format.
Can I delete Binlog MySQL?
Can I Remove MySQL Binary Log Yes, as long as the data is replicated to Slave server, it’s safe to remove the file. It’s recommend only remove MySQL Binary Log older than 1 month. Besides, if Recovery of data is the main concern, it’s recommend to archive MySQL Binary Log.
How do I know if MySQL Binlog is enabled?
Checking If Binary Logs Are Enabled
mysql> SHOW VARIABLES LIKE ‘log_bin’; This value cannot be changed at runtime and requires a MySQL restart to change. While the log_bin system variable reports whether or not binary logging is enabled, the –log-bin server option specifies the location to the binary location.
What is binary data type in MySQL?
The BINARY and VARBINARY types are similar to CHAR and VARCHAR , except that they store binary strings rather than nonbinary strings. … This means they have the binary character set and collation, and comparison and sorting are based on the numeric values of the bytes in the values.
How do I read a Binlog file?
You can use mysqlbinlog to read binary log files directly and apply them to the local MySQL server. You can also read binary logs from a remote server by using the –read-from-remote-server option. To read remote binary logs, the connection parameter options can be given to indicate how to connect to the server.
What is Sync_binlog in MySQL?
When the limit is reached, MySQL has to perform a binary log rotation. With sync_binlog=0, all previous writes to the binary log are cached in the OS cache, and during rotation, MySQL forces synchronous flushing of all changes to disk.
What is Binlog_checksum?
binlog_checksum supports the values NONE (disabled) and CRC32 . The default is CRC32 . … Changing the value of this variable causes the binary log to be rotated; checksums are always written to an entire binary log file, and never to only part of one.