Moving from MySQL 5.7 to MySQL 8.0 - What You Should Know | Severalnines (2023)

April 2018 is not just a date for the MySQL world. MySQL 8.0 was released there, and more than 1 year after, it’s probably time to consider migrating to this new version.

MySQL 8.0 has important performance and security improvements, and, as in all migration to a new database version, there are several things to take into account before going into production to avoid hard issues like data loss, excessive downtime, or even a rollback during the migration task.

In this blog, we’ll mention some of the new MySQL 8.0 features, some deprecated stuff, and what you need to keep in mind before migrating.

What’s New in MySQL 8.0?

Let’s now summarize some of the most important features mentioned in the official documentation for this new MySQL version.

  • MySQL incorporates a transactional data dictionary that stores information about database objects.
  • An atomic DDL statement combines the data dictionary updates, storage engine operations, and binary log writes associated with a DDL operation into a single, atomic transaction.
  • The MySQL server automatically performs all necessary upgrade tasks at the next startup to upgrade the system tables in the mysql schema, as well as objects in other schemas such as the sys schema and user schemas. It is not necessary for the DBA to invoke mysql_upgrade.
  • It supports the creation and management of resource groups, and permits assigning threads running within the server to particular groups so that threads execute according to the resources available to the group.
  • Table encryption can now be managed globally by defining and enforcing encryption defaults. The default_table_encryption variable defines an encryption default for newly created schemas and general tablespace. Encryption defaults are enforced by enabling the table_encryption_privilege_check variable.
  • The default character set has changed from latin1 to utf8mb4.
  • It supports the use of expressions as default values in data type specifications. This includes the use of expressions as default values for the BLOB, TEXT, GEOMETRY, and JSON data types.
  • Error logging was rewritten to use the MySQL component architecture. Traditional error logging is implemented using built-in components, and logging using the system log is implemented as a loadable component.
  • A new type of backup lock permits DML during an online backup while preventing operations that could result in an inconsistent snapshot. The new backup lock is supported by LOCK INSTANCE FOR BACKUP and UNLOCK INSTANCE syntax. The BACKUP_ADMIN privilege is required to use these statements.
  • MySQL Server now permits a TCP/IP port to be configured specifically for administrative connections. This provides an alternative to the single administrative connection that is permitted on the network interfaces used for ordinary connections even when max_connections connections are already established.
  • It supports invisible indexes. This index is not used by the optimizer and makes it possible to test the effect of removing an index on query performance, without removing it.
  • Document Store for developing both SQL and NoSQL document applications using a single database.
  • MySQL 8.0 makes it possible to persist global, dynamic server variables using the SET PERSIST command instead of the usual SET GLOBAL one.

MySQL Security and Account Management

As there are many improvements related to security and user management, we’ll list them in a separate section.

  • The grant tables in the mysql system database are now InnoDB tables.
  • The new caching_sha2_password authentication plugin is now the default authentication method in MySQL 8.0. It implements SHA-256 password hashing, but uses caching to address latency issues at connect time. It provides more secure password encryption than the mysql_native_password plugin, and provides better performance than sha256_password.
  • MySQL now supports roles, which are named collections of privileges. Roles can have privileges granted to and revoked from them, and they can be granted to and revoked from user accounts.
  • MySQL now maintains information about password history, enabling restrictions on reuse of previous passwords.
  • It enables administrators to configure user accounts such that too many consecutive login failures due to incorrect passwords cause temporary account locking.

InnoDB enhancements

As the previous point, there are also many improvements related to this topic, so we’ll list them in a separate section too.

(Video) MySQL Server InPlace Upgrade MySQL 5.7 to MySQL 8.0 for Beginners

  • The current maximum auto-increment counter value is written to the redo log each time the value changes, and saved to an engine-private system table on each checkpoint. These changes make the current maximum auto-increment counter value persistent across server restarts
  • When encountering index tree corruption, InnoDB writes a corruption flag to the redo log, which makes the corruption flag crash-safe. InnoDB also writes in-memory corruption flag data to an engine-private system table on each checkpoint. During recovery, InnoDB reads corruption flags from both locations and merges results before marking in-memory table and index objects as corrupt.
  • A new dynamic variable, innodb_deadlock_detect, may be used to disable deadlock detection. On high concurrency systems, deadlock detection can cause a slowdown when numerous threads wait for the same lock. At times, it may be more efficient to disable deadlock detection and rely on the innodb_lock_wait_timeout setting for transaction rollback when a deadlock occurs.
  • InnoDB temporary tables are now created in the shared temporary tablespace, ibtmp1.
  • mysql system tables and data dictionary tables are now created in a single InnoDB tablespace file named mysql.ibd in the MySQL data directory. Previously, these tables were created in individual InnoDB tablespace files in the mysql database directory.
  • By default, undo logs now reside in two undo tablespaces that are created when the MySQL instance is initialized. Undo logs are no longer created in the system tablespace.
  • The new innodb_dedicated_server variable, which is disabled by default, can be used to have InnoDB automatically configure the following options according to the amount of memory detected on the server: innodb_buffer_pool_size, innodb_log_file_size, and innodb_flush_method. This option is intended for MySQL server instances that run on a dedicated server.
  • Tablespace files can be moved or restored to a new location while the server is offline using the innodb_directories option.

Now, let’s take a look at some of the features that you shouldn’t use anymore in this new MySQL version.

What is Deprecated in MySQL 8.0?

The following features are deprecated and will be removed in a future version.

  • The utf8mb3 character set is deprecated. Please use utf8mb4 instead.
  • Because caching_sha2_password is the default authentication plugin in MySQL 8.0 and provides a superset of the capabilities of the sha256_password authentication plugin, sha256_password is deprecated.
  • The validate_password plugin has been reimplemented to use the server component infrastructure. The plugin form of validate_password is still available but is deprecated.
  • The ENGINE clause for the ALTER TABLESPACE and DROP TABLESPACE statements.
  • AUTO_INCREMENT support is deprecated for columns of type FLOAT and DOUBLE (and any synonyms). Consider removing the AUTO_INCREMENT attribute from such columns, or convert them to an integer type.
  • The UNSIGNED attribute is deprecated for columns of type FLOAT, DOUBLE, and DECIMAL (and any synonyms). Consider using a simple CHECK constraint instead for such columns.
  • FLOAT(M,D) and DOUBLE(M,D) syntax to specify the number of digits for columns of type FLOAT and DOUBLE (and any synonyms) is a nonstandard MySQL extension. This syntax is deprecated.
  • The nonstandard C-style &&, ||, and ! operators that are synonyms for the standard SQL AND, OR, and NOT operators, respectively, are deprecated. Applications that use the nonstandard operators should be adjusted to use the standard operators.
  • The mysql_upgrade client is deprecated because its capabilities for upgrading the system tables in the mysql system schema and objects in other schemas have been moved into the MySQL server.
  • The mysql_upgrade_info file, which is created data directory and used to store the MySQL version number.
  • The relay_log_info_file system variable and –master-info-file option are deprecated. Previously, these were used to specify the name of the relay log info log and master info log when relay_log_info_repository=FILE and master_info_repository=FILE were set, but those settings have been deprecated. The use of files for the relay log info log and master info log has been superseded by crash-safe slave tables, which are the default in MySQL 8.0.
  • The use of the MYSQL_PWD environment variable to specify a MySQL password is deprecated.

And now, let’s take a look at some of the features that you must stop using in this MySQL version.

What Was Removed in MySQL 8.0?

The following features have been removed in MySQL 8.0.

  • The innodb_locks_unsafe_for_binlog system variable was removed. The READ COMMITTED isolation level provides similar functionality.
  • Using GRANT to create users. Instead, use CREATE USER. Following this practice makes the NO_AUTO_CREATE_USER SQL mode immaterial for GRANT statements, so it too is removed, and an error now is written to the server log when the presence of this value for the sql_mode option in the options file prevents mysqld from starting.
  • Using GRANT to modify account properties other than privilege assignments. This includes authentication, SSL, and resource-limit properties. Instead, establish such properties at account-creation time with CREATE USER or modify them afterward with ALTER USER.
  • IDENTIFIED BY PASSWORD ‘auth_string’ syntax for CREATE USER and GRANT. Instead, use IDENTIFIED WITH auth_plugin AS ‘auth_string’ for CREATE USER and ALTER USER, where the ‘auth_string’ value is in a format compatible with the named plugin.
  • The PASSWORD() function. Additionally, PASSWORD() removal means that SET PASSWORD … = PASSWORD(‘auth_string’) syntax is no longer available.
  • The old_passwords system variable.
  • These system variables: query_cache_limit, query_cache_min_res_unit, query_cache_size, query_cache_type, query_cache_wlock_invalidate.
  • These status variables: Qcache_free_blocks, Qcache_free_memory, Qcache_hits, Qcache_inserts, Qcache_lowmem_prunes, Qcache_not_cached, Qcache_queries_in_cache, Qcache_total_blocks.
  • These thread states: checking privileges on cached query, checking query cache for a query, invalidating query cache entries, sending cached result to the client, storing result in the query cache, Waiting for query cache lock.
  • The tx_isolation and tx_read_only system variables have been removed. Use transaction_isolation and transaction_read_only instead.
  • The sync_frm system variable has been removed because .frm files have become obsolete.
  • The secure_auth system variable and –secure-auth client option have been removed. The MYSQL_SECURE_AUTH option for the mysql_options() C API function was removed.
  • The log_warnings system variable and –log-warnings server option have been removed. Use the log_error_verbosity system variable instead.
  • The global scope for the sql_log_bin system variable was removed. sql_log_bin has session scope only, and applications that rely on accessing @@GLOBAL.sql_log_bin should be adjusted.
  • The unused date_format, datetime_format, time_format, and max_tmp_tables system variables are removed.
  • The deprecated ASC or DESC qualifiers for GROUP BY clauses are removed. Queries that previously relied on GROUP BY sorting may produce results that differ from previous MySQL versions. To produce a given sort order, provide an ORDER BY clause.
  • The parser no longer treats N as a synonym for NULL in SQL statements. Use NULL instead. This change does not affect text file import or export operations performed with LOAD DATA or SELECT … INTO OUTFILE, for which NULL continues to be represented by N.
  • The client-side –ssl and –ssl-verify-server-cert options have been removed. Use –ssl-mode=REQUIRED instead of –ssl=1 or –enable-ssl. Use –ssl-mode=DISABLED instead of –ssl=0, –skip-ssl, or –disable-ssl. Use –ssl-mode=VERIFY_IDENTITY instead of –ssl-verify-server-cert options.
  • The mysql_install_db program has been removed from MySQL distributions. Data directory initialization should be performed by invoking mysqld with the –initialize or –initialize-insecure option instead. In addition, the –bootstrap option for mysqld that was used by mysql_install_db was removed, and the INSTALL_SCRIPTDIR CMake option that controlled the installation location for mysql_install_db was removed.
  • The mysql_plugin utility was removed. Alternatives include loading plugins at server startup using the –plugin-load or –plugin-load-add option, or at runtime using the INSTALL PLUGIN statement.
  • The resolveip utility is removed. nslookup, host, or dig can be used instead.

There are a lot of new, deprecated, and removed features. You can check the official website for more detailed information.

Considerations Before Migrating to MySQL 8.0

Let’s mention now some of the most important things to consider before migrating to this MySQL version.

(Video) MySQL Upgrade from MySQL 5.7 to MySQL 8 using YUM repository | Tutorial 8

Authentication Method

As we mentioned, caching_sha2_password is not the default authentication method, so you should check if your application/connector supports it. If not, let’s see how you can change the default authentication method and the user authentication plugin to ‘mysql_native_password’ again.

To change the default authentication method, edit the my.cnf configuration file, and add/edit the following line:

$ vi /etc/my.cnf[mysqld]default_authentication_plugin=mysql_native_password

To change the user authentication plugin, run the following command with a privileged user:

$ mysql -pALTER USER ‘username’@’hostname’ IDENTIFIED WITH ‘mysql_native_password’ BY ‘password’;

Anyway, these changes aren’t a permanent solution as the old authentication could be deprecated soon, so you should take it into account for a future database upgrade.

Also the roles are an important feature here. You can reduce the individual privileges assigning it to a role and adding the corresponding users there.

For example, you can create a new role for the marketing and the developers teams:

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$ mysql -pCREATE ROLE 'marketing', 'developers';

Assign privileges to these new roles:

GRANT SELECT ON *.* TO 'marketing';GRANT ALL PRIVILEGES ON *.* TO 'developers';

And then, assign the role to the users:

GRANT 'marketing' TO 'marketing1'@'%';GRANT 'marketing' TO 'marketing2'@'%';GRANT 'developers' TO 'developer1'@'%';

And that’s it. You’ll have the following privileges:

SHOW GRANTS FOR 'marketing1'@'%';+-------------------------------------------+| Grants for [emailprotected]% |+-------------------------------------------+| GRANT USAGE ON *.* TO `marketing1`@`%` || GRANT `marketing`@`%` TO `marketing1`@`%` |+-------------------------------------------+2 rows in set (0.00 sec)SHOW GRANTS FOR 'marketing';+----------------------------------------+| Grants for [emailprotected]% |+----------------------------------------+| GRANT SELECT ON *.* TO `marketing`@`%` |+----------------------------------------+1 row in set (0.00 sec)

Character Sets

As the new default character set is utf8mb4, you should make sure you’re not using the default one as it’ll change.

To avoid some issues, you should specify the character_set_server and the collation_server variables in the my.cnf configuration file.

$ vi /etc/my.cnf[mysqld]character_set_server=latin1collation_server=latin1_swedish_ci

MyISAM Engine

The MySQL privilege tables in the MySQL schema are moved to InnoDB. You can create a table engine=MyISAM, and it will work as before, but coping a MyISAM table into a running MySQL server will not work because it will not be discovered.

(Video) Plan your MySQL upgrade


There must be no partitioned tables that use a storage engine that does not have native partitioning support. You can run the following query to verify this point.


If you need to change the engine of a table, you can run:


Upgrade Check

As a last step, you can run the mysqlcheck command using the check-upgrade flag to confirm if everything looks fine.

$ mysqlcheck -uroot -p --all-databases --check-upgradeEnter password:mysql.columns_priv OKmysql.component OKmysql.db OKmysql.default_roles OKmysql.engine_cost OKmysql.func OKmysql.general_log OKmysql.global_grants OKmysql.gtid_executed OKmysql.help_category OKmysql.help_keyword OKmysql.help_relation OKmysql.help_topic OKmysql.innodb_index_stats OKmysql.innodb_table_stats OKmysql.password_history OKmysql.plugin OKmysql.procs_priv OKmysql.proxies_priv OKmysql.role_edges OKmysql.server_cost OKmysql.servers OKmysql.slave_master_info OKmysql.slave_relay_log_info OKmysql.slave_worker_info OKmysql.slow_log OKmysql.tables_priv OKmysql.time_zone OKmysql.time_zone_leap_second OKmysql.time_zone_name OKmysql.time_zone_transition OKmysql.time_zone_transition_type OKmysql.user OKsys.sys_config OKworld_x.countryinfo OKworld_x.countrylanguage OK

There are several things to check before performing the upgrade. You can check the official MySQL documentation for more detailed information.

Upgrade Methods

There are different ways to upgrade MySQL 5.7 to 8.0. You can use the upgrade in-place or even create a replication slave in the new version, so you can promote it later.

But before upgrading, step 0 must be backing up your data. The backup should include all the databases including the system databases. So, if there is any issue, you can rollback asap.

(Video) MySQL Upgrade Checker | MySQL Upgrade | Percona server 5.7 to 8.0.27 | MySQL Shell utility | Percona

Another option, depending on the available resources, can be creating a cascade replication MySQL 5.7 -> MySQL 8.0 -> MySQL 5.7, so after promoting the new version, if something went wrong, you can promote the slave node with the old version back. But it could be dangerous if there was some issue with the data, so the backup is a must before it.

For any method to be used, it’s necessary a test environment to verify that the application is working without any issue using the new MySQL 8.0 version.


More than 1 year after the MySQL 8.0 release, it is time to start thinking to migrate your old MySQL version, but luckily, as the end of support for MySQL 5.7 is 2023, you have time to create a migration plan and test the application behavior with no rush. Spending some time in that testing step is necessary to avoid any issue after migrating it.


What are the changes from MySQL 5.7 to 8? ›

The first step in upgrading to MySQL 8.0 is checking the upgrade preparedness of the existing MySQL 5.7 server.
  • Usage of db objects with. ...
  • Usage of utf8mb3 charset. ...
  • Usage of use ZEROFILL/display. ...
  • Issues reported by 'check table x for upgrade'
Jun 8, 2018

Is MySQL 5.7 compatible with MySQL 8? ›

This is generally true, for example MySQL 8.0 is able to read the MySQL 5.7 FRM files and create the new data dictionary based on the MySQL 5.7 image. In most cases, the upgrade from MySQL 5.7 to MySQL 8.0 is seamless.

How to convert MySQL 5 to MySQL 8? ›

Importing the data from the MySQL dump

Clicking on the "Import" button will migrate your MySQL 5 data into your new MySQL 8 database. After the import is completed, you will have a MySQL 8 database with the same data in it as the MySQL 5 one, and you can proceed to configuring your application to use the new database.

How do I upgrade MySQL from 5.5 to 8? ›

To perform an upgrade using MySQL Installer:
  1. Start MySQL Installer.
  2. From the dashboard, click Catalog to download the latest changes to the catalog. ...
  3. Click Upgrade. ...
  4. Deselect all but the MySQL server product, unless you intend to upgrade other products at this time, and click Next.
  5. Click Execute to start the download.

How do I downgrade to MySQL 8? ›

In-place downgrade (downgrades within MySQL 8)
In-place Downgrades
  1. Shut down the old MySQL version.
  2. Replace the MySQL 8.0 binaries or older binaries.
  3. Restart MySQL on the existing data directory.
  4. Run the mysql_upgrade utility.

Is MySQL 5.7 outdated? ›

Due to very low demand, MySQL has stopped development and support for macOS 10.15. MySQL 8.0 is the only supported version on macOS. Users of MySQL 5.7 are encouraged to upgrade to MySQL 8.0. Source and binaries for previously released versions will continue to be available from the archives.

How long will MySQL 5.7 be supported? ›

MySQL 5.7 – Community end of life planned until October, 2023. Amazon RDS for MySQL will continue to support until the community EOL date. MySQL 8.0 – Community end of life planned until April, 2026.

How many connections MySQL 8 can handle? ›

Simultaneous MySQL connection limits

Each database user is limited to 38 simultaneous MySQL connections. This limitation helps to prevent overloading the MySQL server to the detriment of other sites hosted on the server.

Can I have 2 versions of MySQL installed? ›

This indicates that using the MySQL community installer, we can install a different version of MySQL but cannot install multiple instances of the same version. To run multiple instances, the second instance of MySQL must install as a windows service. The installation must be performed manually using a command prompt.

What are the changes in MySQL 8? ›

The following features have been added to MySQL 8.0:
  • Data dictionary. ...
  • Atomic data definition statements (Atomic DDL). ...
  • Upgrade procedure. ...
  • Session Reuse. ...
  • Security and account management. ...
  • Resource management. ...
  • Table encryption management. ...
  • InnoDB enhancements.

How do I upgrade my MySQL database to a new version? ›

Step 2: Navigate to Software > MySQL Upgrade or type “MySQL” into the search bar. You may also find it under SQL Services > MySQL/MariaDB Upgrade. Step 3: Select the version of MySQL you want to upgrade to and click Next. Now follow the upgrade steps, and it'll take care of everything for you.

Why did MySQL jump to version 8? ›

Why did MySQL version numbering skip versions 6 and 7 and go straight to 8.0? "Due to the many new and important features we were introducing in this MySQL version, we decided to start a fresh new series. As the series numbers 6 and 7 had actually been used before by MySQL, we went to 8.0."

Can you upgrade skipping between MySQL versions? ›

Upgrading to the latest release is recommended before upgrading to the next version. For example, upgrade to the latest MySQL 5.7 release before upgrading to MySQL 8.0. Upgrade that skips versions is not supported. For example, upgrading directly from MySQL 5.6 to 8.0 is not supported.

How do I update MySQL 5.6 to 8? ›

  1. Step 1 - Backup. Perform a MediaCP backup of installation + database: ...
  2. Step 2 - MySQL 5.6 upgrade to 5.7. Ensure MySQL is stopped: mediacp stop mysql; ...
  3. Step 3 - MySQL 5.7 to 8.0. The upgrade between 5.7 and 8.0 is very similar. ...
  4. Step 4 - Clean up.

Can we downgrade MySQL version? ›

Logical downgrade involves using mysqldump to dump all tables from the new MySQL version, and then loading the dump file into the old MySQL version. Logical downgrades are supported for downgrades between releases within the same release series and for downgrades to the previous release level.

How do I switch between MySQL databases? ›

Change or switch DATABASE in MySQL

To change or switch DATABASE, run the same USE database_name query with the new database name that you wish to work on. In the example shown above, USE db3; changes the database, from db2 to db3, on which your SQL queries effect on.

Can I uninstall and reinstall MySQL? ›

Erase/uninstall existing mysql server/client. Delete all files data directory. Delete all mysql config files. Completely reinstall mysql server.

Will uninstalling MySQL delete databases? ›

No, reinstalling mysql-server will not delete you database files, only delete the package files of mysql-server . You will be able to access your files(database) after you re-install the server.

What is the stable version of MySQL? ›

Screenshot of the default MySQL command-line banner and prompt
Developer(s)Oracle Corporation
Initial release23 May 1995
Stable release8.0.32 / 17 January 2023
10 more rows

Which MySQL engine is faster? ›

The InnoDB storage engine excels if you're dealing with especially large or complex projects or data sets, but it's not always a better choice than its predecessor, MyISAM. For smaller applications and databases, MyISAM offers much higher performance.

Which MySQL engine is best? ›

Most Popular MySQL Storage Engines
  • MyISAM. MyISAM was the MySQL default storage engine prior to version 5.5. ...
  • InnoDB. If you work on applications based on MySQL now, InnoDB will most likely be your storage engine. ...
  • Federated. Although not default, Federated is a well-known storage engine for MySQL.
May 25, 2021

How big is too big MySQL database? ›

Row Size Limit Examples

The MySQL maximum row size limit of 65,535 bytes is demonstrated in the following InnoDB and MyISAM examples. The limit is enforced regardless of storage engine, even though the storage engine may be capable of supporting larger rows.

How long does it take to master MySQL? ›

MySQL takes an average of 6 to 7 months to learn. You can learn both simultaneously in less than a year. It can take up to 4 years to learn several different back end languages.

Which version of MySQL server should I use? ›

For new applications, I've said use MySQL 5.5 without hesitation for many months now, and now I'd even say use MySQL 5.6. For older applications running MySQL 5.0, I'd say upgrade to 5.5 directly, skipping over 5.1.

Should I use MySQL 5 or 8? ›

MySQL 8.0 should perform better and shows to be more efficient during benchmarking. It performs very well for read/write Workload versus MySQL 5.7. There's no reason not to use MySQL 8.0 if you're able to upgrade. Please see the following documentation for an in-depth look into MySQL 8.0.

What is a good max connections in MySQL? ›

How Many Connections can MySQL handle? By default, MySQL 5.5+ can handle up to 151 connections. This number is stored in server variable called max_connections.

What is the best max connections in MySQL? ›

MySQL Connection Limits

At provision, Databases for MySQL sets the maximum number of connections to your MySQL database to 200. You can raise this value by Changing the MySQL Configuration.

How many MySQL databases do I need? ›

You should always see at least four MySQL list databases by default. These are special system databases that MySQL installs itself: mysql. information_schema.

How many connections per second can MySQL handle? ›

Due to its architecture, MySQL is really good at accepting new connections at a high speed, up to 80.000 connects/disconnects per second as shown in Figure 4 below.

How to use different version of MySQL? ›

How to Run Different MySQL versions on the Same Server
  1. Multiple MySQL versions running on one server. ...
  2. The Problem. ...
  3. Installing MySQL 5.6. ...
  4. Docker to the rescue. ...
  5. Installing Docker. ...
  6. Spin off MySQL 5.5 container. ...
  7. Connect to MySQL 5.5. ...
  8. Connect to MySQL 5.6.
Jun 1, 2016

What's new with MySQL 8.0 30? ›

MySQL 8.0. 30 now supports GIPK mode, which causes a generated invisible primary key (GIPK) to be added to any InnoDB table that is created without an explicit primary key.

What are the changes on MySQL 8.0 29? ›

Changes in MySQL 8.0. 29 (2022-04-26, General Availability)
  • Authentication Notes.
  • Character Set Support.
  • Compilation Notes.
  • Deprecation and Removal Notes.
  • SQL Function and Operator Notes.
  • Optimizer Notes.
  • Performance Schema Notes.
  • Security Notes.
Apr 26, 2022

What are the password requirements for MySQL 8? ›

Passwords must be at least 8 characters long. To change this length, modify validate_password. length . MEDIUM policy adds the conditions that passwords must contain at least 1 numeric character, 1 lowercase character, 1 uppercase character, and 1 special (nonalphanumeric) character.

How do I reconfigure MySQL? ›

To restart the server configuration, open MySQL Installer from the Start menu and click Reconfigure next to the appropriate server in the dashboard. Product configuration. This step applies to MySQL Server, MySQL Router, and samples only.

Does MySQL 8 Support window functions? ›

MySQL supports window functions that, for each row from a query, perform a calculation using rows related to that row. The following sections discuss how to use window functions, including descriptions of the OVER and WINDOW clauses.

Why do people still use MySQL? ›

It allows programmers to use SQL to create, modify, and extract data from the relational database. By normalizing data in the rows and columns of the tables, MySQL turns into a scalable yet flexible data storage system with a user-friendly interface that can manage lots of data.

How do I stop annoying MySQL update console? ›

Run the MySQL Installer (located at C:\Program Files (x86)\MySQL\MySQL Installer for Windows) Click the wrench icon. Un-check the box to check for updates.

Does MySQL replication affect performance? ›

As the number of replicas connecting to a source increases, the load, although minimal, also increases, as each replica uses a client connection to the source. Also, as each replica must receive a full copy of the source's binary log, the network load on the source may also increase and create a bottleneck.

Do we need to commit after update in MySQL? ›

By default, MySQL runs in autocommit mode. This means that as soon as you execute an update, MySQL will store the update on disk. After this you must use COMMIT to store your changes to disk or ROLLBACK if you want to ignore the changes you have made since the beginning of your transaction.

What happens in MySQL when 2 users update the same row at the same time? ›

If two threads of the same application both try to execute the same query at the same time, mySQL will experience deadlock. The way to prevent deadlock is by locking the table (or row) before writing to it.

How do I optimize a MySQL update query? ›

Exclusive MySQL Performance Tuning Tips For Better Database Optimization
  1. Avoid using functions in predicates.
  2. Avoid using a wildcard (%) at the beginning of a predicate.
  3. Avoid unnecessary columns in SELECT clause.
  4. Use inner join, instead of outer join if possible.
  5. Use DISTINCT and UNION only if it is necessary.
Jul 7, 2021

Why MySQL has gone away? ›

The most common reason for the MySQL server has gone away error is that the server timed out and closed the connection. In this case, you normally get one of the following error codes (which one you get is operating system-dependent). The client couldn't send a question to the server.

Is MySQL used anymore? ›

MySQL Community Edition is the most widely used free database in the industry. Also, its commercial version is used extensively in the industry.

Is MySQL obsolete? ›

The MySQL product continues to be in great shape - reliable, fast, and easy to use. The engineering team is largely intact. It's free and open source software.

Which is the stable version of MySQL? ›

Screenshot of the default MySQL command-line banner and prompt
Initial release23 May 1995
Stable release8.0.32 / 17 January 2023
Written inC, C++
10 more rows

How many rows is too many for MySQL? ›

The MySQL maximum row size limit of 65,535 bytes is demonstrated in the following InnoDB and MyISAM examples. The limit is enforced regardless of storage engine, even though the storage engine may be capable of supporting larger rows.


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Name: Nicola Considine CPA

Birthday: 1993-02-26

Address: 3809 Clinton Inlet, East Aleisha, UT 46318-2392

Phone: +2681424145499

Job: Government Technician

Hobby: Calligraphy, Lego building, Worldbuilding, Shooting, Bird watching, Shopping, Cooking

Introduction: My name is Nicola Considine CPA, I am a determined, witty, powerful, brainy, open, smiling, proud person who loves writing and wants to share my knowledge and understanding with you.