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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 memory buffer to hold changes to the binary log during a transaction. If the data for the transaction exceeds the space in the memory buffer, the excess data is stored in a temporary file.

When binary log encryption is active on the server, the memory buffer is not encrypted, but from MySQL 8. After each transaction is committed, the binary log cache is reset by clearing the memory buffer and truncating the temporary file if used.

If you often use large transactions, you can increase this cache size to get better performance by reducing or eliminating the need to write to temporary files.

When enabled, this variable causes the source to write a checksum for each event in the binary log.

The default is CRC If backward compatibility with older replicas is a concern, you may want to set the value explicitly to NONE.

Up to and including MySQL 8. Due to concurrency issues, a replica can become inconsistent when a transaction contains updates to both transactional and nontransactional tables.

MySQL tries to preserve causality among these statements by writing nontransactional 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.

By default, this variable is disabled. As of MySQL 8. The session user must have privileges sufficient to set restricted session variables. Otherwise, such statements are likely to cause the replica to diverge from the source.

Enables encryption for binary log files and relay log files on this server. OFF is the default. ON sets encryption on for binary log files and relay log files.

Binary logging does not need to be enabled on the server to enable encryption, so you can encrypt the relay log files on a replica that has no binary log.

To use encryption, a keyring plugin must be installed and configured to supply MySQL Server's keyring service. Any supported keyring plugin can be used to store binary log encryption keys.

When you first start the server with binary log encryption enabled, a new binary log encryption key is generated before the binary log and relay logs are initialized.

This key is used to encrypt a file password for each binary log file if the server has binary logging enabled and relay log file if the server has replication channels , and further keys generated from the file passwords are used to encrypt the data in the files.

Relay log files are encrypted for all channels, including Group Replication applier channels and new channels that are created after encryption is activated.

The binary log index file and relay log index file are never encrypted. If you activate encryption while the server is running, a new binary log encryption key is generated at that time.

The exception is if encryption was active previously on the server and was then disabled, in which case the binary log encryption key that was in use before is used again.

The binary log file and relay log files are rotated immediately, and file passwords for the new files and all subsequent binary log files and relay log files are encrypted using this binary log encryption key.

Existing binary log files and relay log files still present on the server are not automatically encrypted, but you can purge them if they are no longer needed.

Previously encrypted files are not automatically decrypted, but the server is still able to read them. Group Replication applier channels are not included in the relay log rotation request, so unencrypted logging for these channels does not start until their logs are rotated in normal use.

Controls what happens when the server encounters an error such as not being able to write to, flush or synchronize the binary log, which can cause the source's binary log to become inconsistent and replicas to lose synchronization.

This setting provides backward compatibility with older versions of MySQL. Sets the binary log expiration period in seconds.

After their expiration period ends, binary log files can be automatically removed. Possible removals happen at startup and when the binary log is flushed.

The default is ROW. Setting the session value of this system variable is a restricted operation.

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.

There are exceptions when you cannot switch the replication format at runtime:. The replication format cannot be changed from within a stored function or a trigger.

Trying to switch the replication format in any of these cases or attempting to set the current replication format results in an error. Switching the replication format at runtime is not recommended when any temporary tables exist, because temporary tables are logged only when using statement-based replication, whereas with row-based replication and mixed replication, they are not logged.

Changing the logging format on a replication source server does not cause a replica to change its logging format to match. The binary log format affects the behavior of the following server options:.

These effects are discussed in detail in the descriptions of the individual options. Controls how many microseconds the binary log commit waits before synchronizing the binary log file to disk.

Also, on highly concurrent workloads, it is possible for the delay to increase contention and therefore reduce throughput.

Typically, the benefits of setting a delay outweigh the drawbacks, but tuning should always be carried out to determine the optimal setting. Formerly, this system variable controlled the time in microseconds to continue reading transactions from the flush queue before proceeding with group commit.

It no longer has any effect. When this variable is enabled on a replication source server which is the default , transaction commit instructions issued to storage engines are serialized on a single thread, so that transactions are always committed in the same order as they are written to the binary log.

Disabling this variable permits transaction commit instructions to be issued using multiple threads. Used in combination with binary log group commit, this prevents the commit rate of a single transaction being a bottleneck to throughput, and might therefore produce a performance improvement.

Transactions are written to the binary log at the point when all the storage engines involved have confirmed that the transaction is prepared to commit.

The binary log group commit logic then commits a group of transactions after their binary log write has taken place. Transactions from a single client always commit in chronological order.

In many cases this does not matter, as operations carried out in separate transactions should produce consistent results, and if that is not the case, a single transaction ought to be used instead.

Specifies whether or not the binary log master key is rotated at server startup. The binary log master key is the binary log encryption key that is used to encrypt file passwords for the binary log files and relay log files on the server.

This global system variable is read-only and can be set only at server startup. For MySQL row-based replication, this variable determines how row images are written to the binary log.

Normally, MySQL logs full rows that is, all columns for both the before and after images. However, it is not strictly necessary to include every column in both images, and we can often save disk, memory, and network usage by logging only those columns which are actually required.

When deleting a row, only the before image is logged, since there are no changed values to propagate following the deletion. When inserting a row, only the after image is logged, since there is no existing row to be matched.

Only when updating a row are both the before and after images required, and both written to the binary log.

For the before image, it is necessary only that the minimum set of columns required to uniquely identify rows is logged.

If the table containing the row has a primary key, then only the primary key column or columns are written to the binary log. If the table has neither a primary key nor a unique key without any NULL columns, then all columns must be used in the before image, and logged.

In the after image, it is necessary to log only the columns which have actually changed. This variable actually takes one of three possible values, as shown in the following list:.

When using minimal or noblob , deletes and updates are guaranteed to work correctly for a given table if and only if the following conditions are true for both the source and destination tables:.

All columns must be present and in the same order; each column must use the same data type as its counterpart in the other table.

In other words, the tables must be identical with the possible exception of indexes that are not part of the tables' primary keys.

If these conditions are not met, it is possible that the primary key column values in the destination table may prove insufficient to provide a unique match for a delete or update.

In this event, no warning or error is issued; the source and replica silently diverge, thus breaking consistency. Configures the amount of table metadata added to the binary log when using row-based logging.

Replicas use the metadata to transfer data when its table structure is different from the source's. External software can use the metadata to decode row events and store the data into external databases, such as a data warehouse.

If the modification requires more space than the full document, or if the server is unable to generate a partial update, the full document is used instead.

This includes a failure to find the path. Be aware that, even with this and other safety checks, if a JSON document on a replica has diverged from that on the source and a partial update is applied, it remains theoretically possible to produce a valid but unexpected JSON document on the replica.

This system variable affects row-based logging only. When enabled, it causes the server to write informational log events such as row query log events into its binary log.

This information can be used for debugging and related purposes, such as obtaining the original query issued on the source when it cannot be reconstructed from the row updates.

These informational events are normally ignored by MySQL programs reading the binary log and so cause no issues when replicating or restoring from backup.

To view them, increase the verbosity level by using mysqlbinlog's --verbose option twice, either as -vv or --verbose --verbose. The size of the memory buffer for the binary log to hold nontransactional statements issued during a transaction.

If the data for the nontransactional statements used in the transaction exceeds the space in the memory buffer, the excess data is stored in a temporary file.

After each transaction is committed, the binary log statement cache is reset by clearing the memory buffer and truncating the temporary file if used.

If you often use large nontransactional statements during transactions, you can increase this cache size to get better performance by reducing or eliminating the need to write to temporary files.

Enables compression for transactions that are written to binary log files on this server. Compressed transaction payloads remain in a compressed state while they are sent in the replication stream to replicas, other Group Replication group members, or clients such as mysqlbinlog , and are written to the relay log still in their compressed state.

Binary log transaction compression therefore saves storage space both on the originator of the transaction and on the recipient and for their backups , and saves network bandwidth when the transactions are sent between server instances.

Compressed transaction payloads received by such server instances are written in their compressed state to the relay log, so they benefit indirectly from compression carried out by other servers in the replication topology.

This system variable cannot be changed within the context of a transaction. The value is an integer that determines the compression effort, from 1 the lowest effort to 22 the highest effort.

If you do not specify this system variable, the compression level is set to 3. As the compression level increases, the data compression ratio increases, which reduces the storage space and network bandwidth required for the transaction payload.

However, the effort required for data compression also increases, taking time and CPU and memory resources on the originating server.

Increases in the compression effort do not have a linear relationship to increases in the data compression ratio. The possible values are:. This is the default.

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Transactions from a single client always commit in chronological order. In many cases this does not matter, as operations carried out in separate transactions should produce consistent results, and if that is not the case, a single transaction ought to be used instead.

Specifies whether or not the binary log master key is rotated at server startup. The binary log master key is the binary log encryption key that is used to encrypt file passwords for the binary log files and relay log files on the server.

This global system variable is read-only and can be set only at server startup. For MySQL row-based replication, this variable determines how row images are written to the binary log.

Normally, MySQL logs full rows that is, all columns for both the before and after images. However, it is not strictly necessary to include every column in both images, and we can often save disk, memory, and network usage by logging only those columns which are actually required.

When deleting a row, only the before image is logged, since there are no changed values to propagate following the deletion. When inserting a row, only the after image is logged, since there is no existing row to be matched.

Only when updating a row are both the before and after images required, and both written to the binary log.

For the before image, it is necessary only that the minimum set of columns required to uniquely identify rows is logged.

If the table containing the row has a primary key, then only the primary key column or columns are written to the binary log. If the table has neither a primary key nor a unique key without any NULL columns, then all columns must be used in the before image, and logged.

In the after image, it is necessary to log only the columns which have actually changed. This variable actually takes one of three possible values, as shown in the following list:.

When using minimal or noblob , deletes and updates are guaranteed to work correctly for a given table if and only if the following conditions are true for both the source and destination tables:.

All columns must be present and in the same order; each column must use the same data type as its counterpart in the other table. In other words, the tables must be identical with the possible exception of indexes that are not part of the tables' primary keys.

If these conditions are not met, it is possible that the primary key column values in the destination table may prove insufficient to provide a unique match for a delete or update.

In this event, no warning or error is issued; the source and replica silently diverge, thus breaking consistency. Configures the amount of table metadata added to the binary log when using row-based logging.

Replicas use the metadata to transfer data when its table structure is different from the source's. External software can use the metadata to decode row events and store the data into external databases, such as a data warehouse.

If the modification requires more space than the full document, or if the server is unable to generate a partial update, the full document is used instead.

This includes a failure to find the path. Be aware that, even with this and other safety checks, if a JSON document on a replica has diverged from that on the source and a partial update is applied, it remains theoretically possible to produce a valid but unexpected JSON document on the replica.

This system variable affects row-based logging only. When enabled, it causes the server to write informational log events such as row query log events into its binary log.

This information can be used for debugging and related purposes, such as obtaining the original query issued on the source when it cannot be reconstructed from the row updates.

These informational events are normally ignored by MySQL programs reading the binary log and so cause no issues when replicating or restoring from backup.

To view them, increase the verbosity level by using mysqlbinlog's --verbose option twice, either as -vv or --verbose --verbose. The size of the memory buffer for the binary log to hold nontransactional statements issued during a transaction.

If the data for the nontransactional statements used in the transaction exceeds the space in the memory buffer, the excess data is stored in a temporary file.

After each transaction is committed, the binary log statement cache is reset by clearing the memory buffer and truncating the temporary file if used.

If you often use large nontransactional statements during transactions, you can increase this cache size to get better performance by reducing or eliminating the need to write to temporary files.

Enables compression for transactions that are written to binary log files on this server. Compressed transaction payloads remain in a compressed state while they are sent in the replication stream to replicas, other Group Replication group members, or clients such as mysqlbinlog , and are written to the relay log still in their compressed state.

Binary log transaction compression therefore saves storage space both on the originator of the transaction and on the recipient and for their backups , and saves network bandwidth when the transactions are sent between server instances.

Compressed transaction payloads received by such server instances are written in their compressed state to the relay log, so they benefit indirectly from compression carried out by other servers in the replication topology.

This system variable cannot be changed within the context of a transaction. The value is an integer that determines the compression effort, from 1 the lowest effort to 22 the highest effort.

If you do not specify this system variable, the compression level is set to 3. As the compression level increases, the data compression ratio increases, which reduces the storage space and network bandwidth required for the transaction payload.

However, the effort required for data compression also increases, taking time and CPU and memory resources on the originating server.

Increases in the compression effort do not have a linear relationship to increases in the data compression ratio. The possible values are:.

This is the default. The default in MySQL 8. The dependency information in those logs is used to assist the process of state transfer from a donor's binary log for distributed recovery, which takes place whenever a member joins or rejoins the group.

Sets an upper limit on the number of row hashes which are kept in memory and used for looking up the transaction that last modified a given row.

Once this number of hashes has been reached, the history is purged. Specifies the number of days before automatic removal of binary log files.

If you do not set a value for either system variable, the default expiration period is 30 days.

A warning message is issued in this situation. ON means that the binary log is available, OFF means that it is not in use. The --log-bin option can be used to specify a base name and location for the binary log.

Holds the base name and path for the binary log files, which can be set with the --log-bin server option. For compatibility with MySQL 5. The default location is the data directory.

Holds the base name and path for the binary log index file, which can be set with the --log-bin-index server option.

This variable applies when binary logging is enabled. It controls whether stored function creators can be trusted not to create stored functions that will cause unsafe events to be written to the binary log.

If the variable is set to 1, MySQL does not enforce these restrictions on stored function creation. This variable also applies to trigger creation.

This read-only system variable is deprecated. Whether updates received by a replica server from a replication source server should be logged to the replica's own binary log.

Enabling this variable causes the replica to write the updates that are received from a source and performed by the replication SQL thread to the replica's own binary log.

Binary logging, which is controlled by the --log-bin option and is enabled by default, must also be enabled on the replica for updates to be logged.

For example, you might want to set up replication servers using this arrangement:. Here, A serves as the source for the replica B , and B serves as the source for the replica C.

For this to work, B must be both a source and a replica. If error is encountered, controls whether the generated warnings are added to the error log or not.

Enabling this variable causes the source to verify events read from the binary log by examining checksums, and to stop with an error in the event of a mismatch.

The minimum value is The maximum possible value is 16EiB exbibytes. 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 nontransactional statements within a transaction require more than this many bytes of memory, the server generates an error.

The maximum and default values are 4GB on bit platforms and 16EB exabytes on bit platforms. For internal use by replication.

When re-executing a transaction on a replica, this is set to the time when the transaction was committed on the original source, measured in microseconds since the epoch.

This allows the original commit timestamp to be propagated throughout a replication topology. However, note that the variable is not intended for users to set; it is set automatically by the replication infrastructure.

This variable controls whether logging to the binary log is enabled for the current session assuming that the binary log itself is enabled. The default value is ON.

Set this variable to OFF for a session to temporarily disable binary logging while making changes to the source you do not want replicated to the replica.

If you are using GTIDs for replication, this means that even when binary logging is later enabled again, the GTIDs written into the log from this point do not account for any transactions that occurred in the meantime, so in effect those transactions are lost.

Controls how often the MySQL server synchronizes the binary log to disk. Instead, the MySQL server relies on the operating system to flush the binary log to disk from time to time as it does for any other file.

This setting provides the best performance, but in the event of a power failure or operating system crash, it is possible that the server has committed transactions that have not been synchronized to the binary log.

This is the safest setting but can have a negative impact on performance due to the increased number of disk writes. In the event of a power failure or operating system crash, transactions that are missing from the binary log are only in a prepared state.

This permits the automatic recovery routine to roll back the transactions, which guarantees that no transaction is lost from the binary log.

In the event of a power failure or operating system crash, it is possible that the server has committed transactions that have not been flushed to the binary log.

This setting can have a negative impact on performance due to the increased number of disk writes. A higher value improves performance, but with an increased risk of data loss.

For the greatest possible durability and consistency in a replication setup that uses InnoDB with transactions, use these settings:. Many operating systems and some disk hardware fool the flush-to-disk operation.

They may tell mysqld that the flush has taken place, even though it has not. In this case, the durability of transactions is not guaranteed even with the recommended settings, and in the worst case, a power outage can corrupt InnoDB data.

Using a battery-backed disk cache in the SCSI disk controller or in the disk itself speeds up file flushes, and makes the operation safer.

You can also try to disable the caching of disk writes in hardware caches. The process of extracting the writes from a transaction is used in Group Replication for conflict detection and certification on all group members.

Configuring Replication.

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