The following is a comparison of variables that either appear only in MariaDB 11.3 or MySQL 8.0, or have different default settings in MariaDB 11.3, and MySQL 8.0. The releases MariaDB 11.3.1 and MySQL 8.0.35, with only default plugins enabled, were used for the comparison. Note that MySQL 8 is an 'evergreen' release, so features may be added or removed in later releases.
For a more complete list of differences, see Incompatibilities and Feature Differences Between MariaDB 11.3 and MySQL 8.0 and Function Differences Between MariaDB 11.3 and MySQL 8.0
Variable
MariaDB 11.3 Default
MySQL 8.0 Default
Notes
activate_all_roles_on_login
-
OFF
Determines whether to automatically activate on login.
admin*
-
*
MySQL admin connections.
0
-
Only available as an option in MySQL.
DEFAULT
-
MariaDB 10.3 introduced new clauses to avoid slow copies in certain instances. This variable allows setting this if no ALGORITHM clause is specified.
100.0000
-
Percentage of rows from the table will sample to collect table statistics.
*
-
The Aria storage engine is only available in MariaDB.
authentication_policy
-
*,,
MySQL authentication policy.
auto_generate_certs
-
ON
Whether to automatically generate SSL key and certificate files.
avoid_temporal_upgrade
-
OFF
Determines whether ALTER TABLE implicitly upgrades temporal columns.
Autosized
Autosized
MariaDB and MySQL have different autosizing algorithms.
OFF
-
When set, split ALTER at binary logging into two statements: START ALTER and COMMIT/ROLLBACK ALTER.
ON
-
Introduced in MariaDB 5.3 for replicating between MariaDB 5.3 and MySQL/MariaDB 5.1.
NULL
-
A system variable as well as an option in MariaDB 11.
0
-
For use in MariaDB's .
100000
-
For use in MariaDB's .
NULL
-
A system variable as well as an option in MariaDB 11.
binlog_encryption
-
OFF
MySQL name for .
binlog_error_action
ABORT_SERVER
MySQL-only variable for controlling what happens when the server cannot write to the binary log.
binlog_expire_logs_auto_purge
-
ON
Enables or disables automatic purging of binary log files.
0
2592000
Sets the binary log expiration period in seconds
16184
-
For setting the size of the file cache for the .
MIXED
ROW
MariaDB and MySQL have differing .
binlog_group_commit_sync_delay
0
MySQL-only variable for controlling the wait time before synchronizing the binary log file to disk.
binlog_group_commit_sync_no_delay_count
0
MySQL-only variable for setting the maximum number of transactions to wait for before aborting the current binlog_group_commit_sync_delay delay.
binlog_gtid_simple_recovery
-
ON
MySQL-only GTID variable. MariaDB's implementation is different.
binlog_max_flush_queue_time
-
0
Specifies a timeout for reading transactions from the flush queue before continuing with group commit and syncing log to disk.
ON
-
For optimized kernel thread scheduling.
binlog_order_commits
-
ON
Determines whether transactions may be committed in parallel.
binlog_rotate_encryption_master_key_at_startup
-
OFF
Specifically for use with MySQL binary key encryption.
NO_LOG
MINIMAL
Determines the amount of table metadata added to the binary log with row-based logging.
binlog_row_value_options
-
(empty)
Permits an alternative binlog format for JSON document updates.
binlog_rows_query_log_events
-
OFF
MySQL-only variable for logging extra information in row-based logging.
binlog_transaction_compression*
-
*
MySQL variables relating to binary log compression.
binlog_transaction_dependency_history_size
-
25000
Maximum number of row hashes kept for looking up transactions that last modified a given row.
binlog_transaction_dependency_tracking
-
COMMIT_ORDER
For determining how to best use the slave's multithreaded applier.
caching_sha2_password*
-
*
For use with MySQL's SHA-256 authentication with caching.
latin1 or utf8
utf8mb4
MySQL 8.0 defaults to the utf8mb4 .
Empty
-
Overrides for character set default collations.
ON
-
Permits disabling constraint checks, for example when loading a table that violates some constraints that you plan to fix later.
check_proxy_users
OFF
MySQL-only variable for controlling whether the server performs proxy user mapping for authentication plugins.
latin1_swedish_ci or utf8_general_ci
utf8mb4_0900_ai_ci
MySQL 8.0 defaults to the utf8mb4 .
100
-
MariaDB supports .
6
-
MariaDB supports .
DEFAULT_STRATEGY
-
MariaDB supports .
OFF
-
MariaDB supports .
connection_memory_chunk_size
-
8192
Chunk size for updates to the Global_connection_memory counter.
connection_memory_limit
-
18446744073709551615
Maximum memory for a single user connection.
create_admin_listener_thread
-
OFF
MySQL-only variable for whether to use a dedicated listening thread for admin network interface connections.
cte_max_recursion_depth
-
1000
When MySQL 8.0 introduced they used a different name. MariaDB's variable is called .
15
-
The Aria storage engine is only available in MariaDB.
4
-
The Aria storage engine is only available in MariaDB.
50000000
-
The Aria storage engine is only available in MariaDB.
10000
-
The Aria storage engine is only available in MariaDB.
OFF
-
Disable system thread alarm calls, for debugging or testing.
default_authentication_plugin
-
caching_sha2_password
MySQL 8 introduced a new authentication plugin.
default_collation_for_utf8mb4
-
utf8mb4_0900_ai_ci
For internal use in MySQL 8 replication.
empty
-
For use with MariaDB's .
empty
-
For handling incompatibilities between MariaDB's and the old regex library.
empty
InnoDB
Default storage engine used for tables created with .
disabled_storage_engines
empty
MySQL-only variable for disabling specific storage engines.
OFF
ON
MariaDB password expiration is off by default, and by default does not disconnect a client when a password has expired.
OFF
-
MariaDB enables .
OFF
-
MariaDB enables .
OFF
-
MariaDB enables .
end_markers_in_json
-
OFF
MySQL-only variable for adding end markers to JSON output.
enforce_gtid_consistency
-
OFF
MariaDB and MySQL have different .
none
Forces the use of a particular storage engine for new tables.
0
200
Variable for tuning when the optimizer should switch from using index dives to index statistics for qualifying rows estimation.
OFF
ON
MySQL enables the event scheduler by default.
100
-
Used for determining expensive queries for optimization.
1
-
Introduced in the .
0
-
Introduced in the .
1048576
1024
MariaDB increases the maximum length for a result from 1K to 1M.
empty
-
MariaDB and MySQL have different .
empty
-
MariaDB and MySQL have different .
64
-
MariaDB and MySQL have different .
empty
-
MariaDB and MySQL have different .
0
-
MariaDB and MySQL have different .
gtid_executed
-
empty
MariaDB and MySQL have different .
gtid_executed_compression_period
-
1000
MariaDB and MySQL have different .
OFF
-
MariaDB and MySQL have different .
gtid_mode
-
OFF
MariaDB and MySQL have different .
gtid_next
-
AUTOMATIC
MariaDB and MySQL have different .
gtid_owned
-
empty
MariaDB and MySQL have different .
empty
-
MariaDB and MySQL have different .
gtid_purged
-
empty
MariaDB and MySQL have different .
0
-
MariaDB and MySQL have different .
empty
-
MariaDB and MySQL have different .
OFF
-
MariaDB and MySQL have different .
YES
-
MySQL has removed the function.
MariaDB's version indicates whether YaSSL or openssl was used. MySQL's is a synonym for have_ssl.
YES
-
MySQL has removed the .
have_statement_timeout
-
Whether MySQL's statement execution timeout feature is available.
YES
DISABLED
MySQL has removed symlink support.
histogram_generation_max_mem_size
-
20000000
Added when MySQL 8 introduced . MariaDB uses
0
-
MariaDB introduced .
JSON_HB
-
MariaDB introduced .
0
-
Time in seconds that the server waits for idle read-only transactions.
0
-
Time in seconds that the server waits for idle transactions.
0
-
Time in seconds that the server waits for idle write transactions.
OFF
-
Ignored and removed in MySQL 8.
1000
-
Controls the optimization.
0
-
Set to 1 if you are in a transaction, and 0 if not.
information_schema_stats_expiry
-
86400
Time until MySQL Information Schema cached statistics expire.
10.000000
10
Adaptive flushing is enabled when this low water mark percentage of the redo log capacity is reached. MariaDB's variable is a , MySQL's an .
OFF
ON
Defaulting to OFF is a performance improvement especially for , , , or operations
-
150000
Deprecated and ignored in MariaDB 10.5 and removed in MariaDB 10.6.
innodb_api_*
-
*
Specific to MySQL's memcached, removed in MariaDB 10.2.
1
2
MariaDB has an extra mode, 3, for skipping the rollback of connected transactions. MySQL defaults to row-based replication, so can safely use 2.
-
1
Deprecated and ignored in MariaDB 10.5 and removed in MariaDB 10.6 since the original reasons for introducing no longer apply.
innodb_change*
*
The was removed in MariaDB 11.0.
full_crc32
crc32
fullcrc32 permits encryption to be supported over a SPATIAL INDEX, which crc32 does not support.
-
0
Deprecated and ignored in MariaDB 10.5 and removed in MariaDB 10.6.
*
-
Introduced with MariaDB's .
-
5000
Deprecated and ignored in MariaDB 10.5 and removed in MariaDB 10.6.
Full
-
How to report deadlocks.
innodb_dedicated_server
-
OFF
MySQL option that automatically configures various settings if the server is a dedicated InnoDB database server.
1
-
Default encryption key id used for table encryption. See .
innodb_directories
-
(empty)
Used to search for tablespace files when moving or restoring a new location.
OFF
-
Tell InnoDB to stop any writes to disk.
1
-
See MariaDB's .
600
-
MariaDB's fatal semaphore timeout is configurable.
O_DIRECT
fsync
MariaDB InnoDB flushing method by default on Unix systems bypasses the file system cache for improved performance in most cases.
1
0
MySQL 8 by default now assumes the use of an SSD device.
OFF
-
If set to 1 in MariaDB (0 is default) CREATE TABLEs without a primary or unique key where all keyparts are NOT NULL will not be accepted, and will return an error.
OFF
-
MariaDB has support for .
add_drop_reorder
-
See .
-
ON
Deprecated and ignored in MariaDB 10.5 and removed in MariaDB 10.6, as there is no reason to allow checksums to be disabled on the redo log.
-
ON
Deprecated and ignored in MariaDB 10.5 and removed in MariaDB 10.6 as part of the InnoDB redo log performance improvements.
-
2
Deprecated and ignored in MariaDB 10.5 and removed in MariaDB 10.6 as part of the InnoDB redo log performance improvements.
innodb_log_spin_*
-
*
MySQL variables for constraining CPU usage while waiting for flushed redo.
innodb_log_wait_for_flush_spin_hwm
-
*
MySQL variable for constraining CPU usage while waiting for flushed redo.
75
90
MySQL 8 increased the default to 90.
0
10
MySQL 8 increased the default to 10.
10485760
1073741824
MariaDB 10.2 reduced the limit for when an undo tablespace is marked for truncation.
Autosized (2000)
Autosized (4000)
In most systems, autosized based on the setting, which differs between MariaDB and MySQL.
-
1
Deprecated and ignored in MariaDB 10.5 and removed in MariaDB 10.6 as the original reasons for splitting the buffer pool have mostly gone away.
OFF
-
MariaDB includes the Facebook prefix index queries optimization.
innodb_print_ddl_logs
-
OFF
MySQL option for writing DDL logs to stderr.
1000
300
Increased to 1000 in MariaDB after benchmarking found this value to help reduce purge lag without having a significant impact on workload throughput.
ON
-
Whether to set tables to read-only.
innodb_redo_log_encrypt
-
OFF
MySQL 8 has also now introduced redo log encryption, but used a different name. The equivalent option in MariaDB is .
-
0
Deprecated and ignored in MariaDB 10.5 and removed in MariaDB 10.6.
-
128
Removed in MariaDB as part of the InnoDB cleanup. It makes sense to always create and use the maximum number of rollback segments.
4
6
MariaDB changed the default from 6 to 4 based on extensive benchmarking.
0
-
MariaDB option to control the calculation of new statistics.
ON
-
Enabling gives a larger sample of pages for larger tables for the purposes of index statistics calculation.
-
1
Deprecated and ignored in MariaDB 10.5 and removed in MariaDB 10.6.
-
0
Deprecated and ignored in MariaDB 10.5 and removed in MariaDB 10.6.
-
10000
Deprecated and ignored in MariaDB 10.5 and removed in MariaDB 10.6.
OFF
-
MariaDB option for shrinking the temporary tablespace.
innodb_undo_log_encrypt
-
OFF
MySQL option for encrypting undo logs residing in separate undo tablespaces.
OFF
ON
MySQL 8 changes the default to ON, marking larger undo logs for truncation.
3
2
Number of tablespace files used for dividing up the undo logs. MySQL 8 has deprecated this setting, and increased the default (and minimum) to 2.
ON
-
are a faster alternative to innodb_doublewrite and MariaDB automatically detects when supporting SSD cards are used.
internal_tmp_disk_storage_engine
-
INNODB
MySQL uses this variable to set the storage engine for on-disk internal temporary tables.
internal_tmp_mem_storage_engine
-
TEMPTABLE
MySQL and MariaDB use different formats for temporary tables. In MariaDB, the performs a similar function.
2097152
-
Maximum size in bytes of the query buffer. See .
2
-
For determining the join algorithms. See
134217728
8388608
Size of the buffer for the index blocks used by MyISAM tables and shared for all threads.
512
-
Number of hash buckets for open and changed files.
0
-
The number of segments in a key cache. See .
keyring_operations
-
ON
Whether MySQL 8's keyring operations are enabled.
-
empty
MariaDB and MySQL have different .
ON
OFF
MySQL no longer supports LOAD DATA LOCAL by default.
86400
31536000
MariaDB has reduced the timeout for acquiring metadata locks.
OFF
ON
MySQL 8 enables the by default.
OFF
-
MariaDB setting for whether or not the can be compressed.
256
-
Minimum length of sql statement (in statement mode) or record (in row mode) that can be compressed. See .
log_bin_use_v1_row_events
-
OFF
MySQL-only variable showing whether or not MySQL's version 2 binary logging format is being used.
sp
-
Disable logging of certain statements to the .
log_error_services
-
log_filter_internal; log_sink_internal
Components to enable for MySQL error logging.
log_error_verbosity
-
3
MySQL variable for setting verbosity of error, warning, and note messages in the error log.
OFF
ON
MySQL 8 has by default enabled of updates a slave receives from a master.
ON
OFF
MariaDB logs slow admin statements to the by default.
admin,call,slave,sp
-
Disable logging of certain statements to the .
admin, filesort, filesort_on_disk, full_join, full_scan, query_cache, query_cache_miss, tmp_table, tmp_table_on_disk
-
For slow query log filtering.
1
-
Limits the number of queries logged to the .
0
-
Previously named (still an alias).
0
-
Previously named (still an alias).
host_name-slow.log
-
Previously named (still an alias).
10.000000
-
Previously named (still an alias).
10
-
Max numbers of warnings printed to slow query log per statement.
ON
OFF
MariaDB logs slow slave statements to the by default.
empty
-
Controls information to be added to the . See also .
log_statements_unsafe_for_binlog
-
ON
MySQL setting for controlling whether binlog warnings are written to the error log.
log_syslog*
platform-dependent
-
MySQL variables with settings for writing to syslog.
24576
-
Size in bytes of the transaction coordinator log, defined in multiples of 4096.
log_throttle_queries_not_using_indexes
-
0
MySQL-only variable for limiting the number of statements without indexes written to the slow query log.
log_timestamps
-
UTC
MySQL-only variable controlling the timezone for certain logging conditions.
2
-
MySQL 8 has replaced with log_error_verbosity.
mandatory_roles
-
(empty)
MySQL variable for assigning to all users.
master_info_repository
-
TABLE
Whether slave logs master status and connection info to a table or a file.
16M
64M
64
1024
Specifies the maximum number of messages stored for display by and statements.
max_execution_time
-
0
MySQL renamed the max_statement_time variable.
64
1024
Used to decide which algorithm to choose when sorting rows. If the total size of the column data, not including columns that are part of the sort, is less than max_length_for_sort_data, then these are added to the sort key. This can speed up the sort as there's no need to re-read the same row again later. Setting the value too high can slow things down as there will be a higher disk activity for doing the sort.
4294967295
-
Maximum number of failed connections attempts before no more are permitted.
max_points_in_geometry
-
65536
Maximum points_per_circle for MySQL's ST_Buffer_Strategy() function.
4294967295
-
Maximum number of iterations when executing recursive queries.
1073741824
0
Can be set by session in MariaDB.
4294967295
4294967295 (32-bit) or 18446744073709547520 (64-bit)
The most key seeks required when searching with an index, regardless of the actual index cardinality. If this value is set lower than its default and maximum, indexes will tend to be preferred over table scans.
9223372036854775807
-
Amount of memory a single user session is allowed to allocate.
0
-
Maximum time in seconds that a query can execute before being aborted. MySQL used to have a variable of this name before renaming it max_execution_time.
4294967295
4294967295 (32-bit) or 18446744073709547520 (64-bit)
Read lock requests will be permitted for processing after this many write locks.
262144
-
Size of buffer to use when using multi-range read with range access. See .
1024
-
Block size used for index pages.
BACKUP,QUICK
OFF
MyISAM recovery mode.
134216704
8388608
Size in bytes of the buffer allocated when creating or sorting indexes on a MyISAM table.
mysql_native_password_proxy_users
-
OFF
Whether MySQL's authentication plugin supports proxy users. I
ON
Causes MariaDB to use the MySQL-5.6 low level formats for , and instead of the MariaDB 5.3+ version.
new
-
OFF
Used for backward-compatibility with MySQL 4.1, not present in MariaDB.
mysqlx+*
-
*
MySQL's X plugin related variables.
basic,explain
-
Verbosity level for note-warnings given to the user.
ngram_token_size
-
2
Sets the n-gram token size for MySQL's n-gram full-text parser.
offline_mode
-
OFF
MySQL settting for specifying whether the server should run in offline mode.
Empty string
-
Used for getting MariaDB to emulate behavior from an old version of MySQL or MariaDB. See .
OFF
-
MySQL 8 is no longer compatible with the old pre-MySQL 4.1 form of password hashing.
8
-
If the optimizer needs to enumerate a join prefix of this size or larger, then it will try aggressively prune away the search space.
32000
-
The maximum weight of the SEL_ARG graph.
16000
-
Maximum number of SEL_ARG objects created when optimizing a range.
100
-
Controls number of record samples to check condition selectivity.
A series of flags for controlling the query optimizer. MariaDB has introduced a number of new settings.
optimizer_trace_*
-
*
MySQL has more settings for optimizer tracing.
4
-
Controls which statistics can be used by the optimizer when looking for the best query execution plan.
original_commit_timestamp
-
*
Used by MySQL 8 for .
parser_max_mem_size
-
4294967295 (32-bit) or 18446744073709547520 (64-bit)
MySQL variable for limiting memory available to the parser.
password_*
-
*
Controls reuse of previous passwords in MySQL.
OFF
ON
The is off by default in MariaDB.
Many performance schema variables are autoset in MySQL, and MySQL has a different version, with additional variables.
One less than the server maturity
-
Minimum acceptable plugin maturity.
5
-
Time in seconds between sending progress reports to the client for time-consuming statements.
(empty)
-
Enable for these source networks.
16384
8192
Size in bytes of the extra blocks allocated during query parsing and execution (after query_prealloc_size is used up).
*
-
MySQL has removed the .
24576
8192
Size in bytes of the persistent buffer for query parsing and execution, allocated on connect and freed on disconnect.
range_optimizer_max_mem_size
-
8388608
MySQL-only variable setting a limit on the range optimizer's memory usage.
rbr_exec_mode
-
STRICT
MySQL-only variable for determining the handling of certain key errors.
0
-
Permits restricting the speed at which the slave reads the binlog from the master.
regexp_*
-
*
Memory and time limits for regular expression matching operations.
relay_log_info_repository
-
TABLE
MySQL-only variable determining whether the slave's position in the relay logs is written to a file or table.
ON
-
Tells the slave to reproduce annotate_rows_events received from the master in its own binary log.
empty string
-
See .
empty string
-
See .
replicate
-
See .
empty string
-
See .
empty string
-
See .
empty string
-
Only available as an option in MySQL.
empty string
-
See .
empty string
-
See .
result_metadata
-
FULL
Determine whether the server returns result set metadata for connections where this is optional.
8388608
-
See .
rpl_read_size
-
8192
Minimum data in bytes read from the binary and relay log files.
-
-
MariaDB includes without the need to install a plugin.
rpl_stop_slave_timeout
-
31536000
Controls the time that waits before timing out.
*
-
The S3 storage engine is only available in MariaDB.
schema_definition_cache
-
256
Limits the number of schema definition objects kept in the dictionary object cache.
ON
-
Removed in MySQL.
NO
-
MariaDB-only option permitting the restricting of direct setting of a session timestamp..
server_id_bits
-
server_id
MySQL-only variable for use in MySQL Cluster.
server_uuid
-
UUID
MySQL-only variable containing the UUID.
session_track_gtids
-
OFF
MySQL-only variables for tracking gtid changes. MariaDB and MySQL's gtid implementation is different.
autocommit, character_set_client, character_set_connection, character_set_results, redirect_url, time_zone
time_zone, autocommit, character_set_client, character_set_results, character_set_connection
MariaDB supports .
sha256_password_proxy_users
-
OFF
MySQL-only variable determining whether the sha256_password plugin supports proxy users.
show_create_table_verbosity
-
OFF
Option to cause to display ROW_FORMAT in all cases.
show_old_temporals
-
OFF
MySQL-only variable for determining whether SHOW CREATE TABLE output should include comments for old format temporal columns.
OFF
-
See .
OFF
-
See .
slave_allow_batching
-
OFF
MySQL-only replication variable.
slave_checkpoint_group
-
512
MySQL-only replication variable.
slave_checkpoint_period
-
300
MySQL-only replication variable.
IDEMPOTENT
-
Modes for how replication of DDL events should be executed.
0
-
For configuring .
3600
60
MySQL reduced the timeout to 60s.
131072
-
For configuring .
0
-
Only available as an option in MySQL.
0.000000
-
MariaDB setting to abort a query that has taken more than this in seconds to run on the replica.
optimistic
-
Controls what transactions are applied in parallel when using .
0
-
For configuring .
slave_parallel_type
-
DATABASE
MySQL-only replication variable.
slave_pending_jobs_size_max
-
16777216
MySQL-only replication variable.
slave_preserve_commit_order
-
OFF
MySQL-only replication variable.
slave_rows_search_algorithms
-
INDEX_SCAN, HASH_SCAN
MySQL-only replication variable.
NO
See for a description and use-case for this setting.
1213,1205
-
When an error occurs during a transaction on the slave, replication usually halts. By default, transactions that caused a deadlock or elapsed lock wait timeout will be retried. One can add other errors to the list of errors that should be retried by adding a comma-separated list of error numbers to this variable.
0
-
Interval in seconds for the slave SQL thread to retry a failed transaction due to a deadlock, elapsed lock wait timeout or an error listed in slave_transaction_retry_errors.
2097152
262144
The default sort buffer allocated has been reduced in MySQL.
OFF
-
Adds an implicit IF EXISTS to ALTER, RENAME and DROP of TABLES, VIEWS, FUNCTIONS and PACKAGES
STRICT_TRANS_TABLES, ERROR_FOR_DIVISION_BY_ZERO, NO_AUTO_CREATE_USER, NO_ENGINE_SUBSTITUTION
ONLY_FULL_GROUP_BY, STRICT_TRANS_TABLES, NO_ZERO_IN_DATE, NO_ZERO_DATE, ERROR_FOR_DIVISION_BY_ZERO, NO_ENGINE_SUBSTITUTION
See .
ssl_fips_mode
-
OFF
Whether FIPS mode is enabled on the server side. Deprecated in MySQL.
ON
-
See .
InnoDB
-
Alias for , removed in MySQL.
ON
-
In MariaDB, when password validation plugins are enabled, reject passwords that cannot be validated (passwords specified as a hash).
stored_program_definition_cache
-
256
Limits the number of stored program definition objects kept in the dictionary object cache.
super_read_only
-
OFF
MySQL variable for prohibiting client updates from users with the SUPER privilege.
0
1
MySQL synchronizes all actions to the binary log before they are committed.
1
-
.frm files have been removed in MySQL.
ERROR
-
MariaDB has
DEFAULT
-
MariaDB has
OFF
-
MariaDB has
400
-1 (autosized)
Number of table definitions that can be cached.
8
16
Maximum number of table cache instances.
tablespace_definition_cache
-
256
Limits the number of tablespace definition objects kept in the dictionary object cache.
0
-
Interval, in seconds, between when successive keep-alive packets are sent if no acknowledgement is received.
0
-
Number of unacknowledged probes to send before considering the connection dead and notifying the application layer.
0
-
Set the TCP_NODELAY option (disable Nagle's algorithm) on socket.
1
-
Timeout, in milliseconds, with no activity until the first TCP keep-alive packet is sent.
temptable_max_ram
-
1GB
Limits the RAM used by MySQL's TempTable storage engine.
Autosized
-1 (autosized)
MariaDB uses an .
0
-
Better precision for the data in the .
0
-
Better precision for the data in the .
60
-
See .
65536
-
See .
1
-
Windows-only. See .
3
-
See .
auto
-
See .
auto
-
See .
Number of processors
16*
See . *Only available in MySQL with a commercial plugin.
500
6*
See . *Only available in MySQL with a commercial plugin.
299008
Varies
See .
18446744073709551615
-
Max size for data for an internal temporary on-disk MyISAM or Aria table.
16777216
-
Alias for .
transaction_allow_batching
-
OFF
Variable for enabling batching of statements within the same transaction in MySQL Cluster.
transaction_write_set_extraction
-
OFF
Unused MySQL-only variable.
REPEATABLE-READ
-
A MariaDB-only variable, replaced with .
OFF
-
A MariaDB-only variable, replaced with .
preferably_for_queries
-
Controls the use of .
OFF
-
Whether to activate MariaDB's implementation, not available in MySQL.
version_compile_zlib
-
*
Version of the zlib library compiled in.
*
-
Version of the used malloc library.
Varies
-
Permits seeing exactly which version of the source was used for a build.
*
-
Version of the used TLS library.
windowing_high_use_precision
-
*
MySQL option allowing safety to be sacrificed for speed in calculations.
*
-
Galera cluster is only available in MariaDB.
Variable
MySQL 8.0
Notes