Make sure you test the impact first, if you consider enabling these on a production system. For example:. In this case, I have used the sys. In this example, MySQL has spent 6. For comparison, 4. You should check the time spent on writing and reading the binary log files before enabling compression, so you can determine the change in performance. You should also check the change in CPU usage.

In order to determine how well the compression works, I have performed a series of tasks and compared the size of the binary logs with and without compression. For comparison, I have also tried to manually compress the binary logs from the series of tests without compression to see the optimal compression as opposed to the per-transaction compression used by MySQL.

The tests have been performed with the default configuration except the settings necessary for the given test. If you want to try yourself, you can download the Zstandard source code from Facebook's GitHub repository which also includes the compilation instructions. The resulting size of the binary log in bytes for each combination can be found in the following table. That the encrypted binary log compresses as well as the unencrypted suggest that the compression is done before the encryption. Encrypted data does not compress well.

Working with MySQL Binary Logs

Because there is no difference whether encryption is enabled, only the normal uncompressed , compressed, and zstd results will be discussed further. The binary log sizes can also be seen in this figure:.

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When comparing the binary logs compressed by MySQL with those compressed manually with zstd , the file size is around the same for the bulk loads reflecting that for large transactions, compressing on a per-transaction basis works as well as compressing the whole file. As the transaction size becomes smaller, the relative efficiency of the per-transaction compression reduces which is particularly visible for the single row deletes. There are some oddities when it comes to the compression level, and the short story is that there is no need to change the setting.

The first oddity is that the allowed values are but zstd only supports levels There is nothing in the MySQL documentation explaining the difference. For comparison, the compression at levels 1, 3, 11, and 19 are included compressing the binary log manually with zstd. The data can also be seen in this figure:.

As it can be seen, there is essentially no difference in the file size irrespective of the compression level used in MySQL whereas for zstd the file size reduces as expected with increased compression level. For level 1 with the load test MySQL even compresses significantly better than zstd.

It is like the compression level is never being set in MySQL. See Section 6. Disable binary logging. This is useful for avoiding an endless loop if you use the --to-last-log option and are sending the output to the same MySQL server. This option also is useful when restoring after a crash to avoid duplication of the statements you have logged. With this option, if mysqlbinlog reads a binary log event that it does not recognize, it prints a warning, ignores the event, and continues.

Without this option, mysqlbinlog stops if it reads such an event. Display a hex dump of the log in comments, as described in Section 4. The hex output can be helpful for replication debugging. Tell the MySQL Server to use idempotent mode while processing updates; this causes suppression of any duplicate-key or key-not-found errors that the server encounters in the current session while processing updates.

This option may prove useful whenever it is desirable or necessary to replay one or more binary logs to a MySQL Server which may not contain all of the data to which the logs refer. The scope of effect for this option includes the current mysqlbinlog client and session only. These temporary files are not automatically removed by mysqlbinlog or any other MySQL program.

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The password to use when connecting to the server. If you use the short option form -p , you cannot have a space between the option and the password. If you omit the password value following the --password or -p option on the command line, mysqlbinlog prompts for one. Specifying a password on the command line should be considered insecure. You can use an option file to avoid giving the password on the command line. The directory in which to look for plugins.

It may be necessary to specify this option if the --default-auth option is used to specify an authentication plugin but mysqlbinlog does not find it. The connection protocol to use for connecting to the server. It is useful when the other connection parameters normally would cause a protocol to be used other than the one you want.

For details on the permissible values, see Section 4. By default, mysqlbinlog reads binary log files and writes events in text format. The --raw option tells mysqlbinlog to write them in their original binary format. Its use requires that --read-from-remote-server also be used because the files are requested from a server.

The --raw option can be used to make a backup of a server's binary log. With the --stop-never option, the backup is " live " because mysqlbinlog stays connected to the server. By default, output files are written in the current directory with the same names as the original log files. Output file names can be modified using the --result-file option.

15 mysqlbinlog Command Examples for MySQL Binary Log Files

For more information, see Section 4. See also the description for --read-from-remote-server.

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Read the binary log from a MySQL server rather than reading a local log file. Any connection parameter options are ignored unless this option is given as well.

2. Mysqlbinlog Default Behavior

These options are --host , --password , --port , --protocol , --socket , and --user. This option requires that the remote server be running. It works only for binary log files on the remote server, not relay log files. Without the --raw option, this option indicates the file to which mysqlbinlog writes text output. With --raw , mysqlbinlog writes one binary output file for each log file transferred from the server, writing them by default in the current directory using the same names as the original log file.

In this case, the --result-file option value is treated as a prefix that modifies output file names. When reading from a row-based log, rewrite all occurrences of dboldname to dbnewname. For use when restoring tables logged using the row-based format to a database having a different name from the original database. These can be single or double quotation marks ' or ".

Display only the statements contained in the log, without any extra information or row-based events. This is for testing only, and should not be used in production systems. For connections to localhost , the Unix socket file to use, or, on Windows, the name of the named pipe to use.