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The safest general-purpose way to move a MySQL database is a logical dump and restore: export SQL from the source with mysqldump, transfer it over an encrypted connection, import it into the destination, verify the result, and only then redirect the application. For a small or medium database, this is portable across machines and architectures. For a very large database or a cutover that cannot tolerate a long write freeze, use a staged snapshot with replication, mysqlimport, or the MySQL Clone plugin when its same-series requirements are met.
This guide gives exact commands, explains consistency and privilege handling, and provides a cutover and rollback plan. Replace hostnames, database names, ports, and account names with values from your environment; do not put real passwords directly in shell history.
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Choose the migration method before touching production
The right method depends less on the database name than on its size, storage engines, MySQL versions, network capacity, and downtime budget. Oracle MySQL describes a logical dump as “the easiest (although not the fastest) way to move a database between two machines.” It emits SQL statements that recreate object definitions and table data, so it is usually the most portable option.
| Method | Best fit | Downtime profile | Main constraints |
|---|---|---|---|
Streamed mysqldump to the target |
Small or medium databases and a reliable network path | Writes continue while the dump runs; a final pause is still needed for a clean cutover unless replication is used | Can be slow for very large tables and generates SQL insert work on the target |
| Compressed dump file | When you need an auditable file, staged transfer, or an offline restore | Same logical consistency considerations as a streamed dump | Requires temporary disk space and secure file handling |
--tab plus mysqlimport |
Large tables where replaying every row as an INSERT is a bottleneck |
Usually shorter load time, but still needs a controlled cutover | Data files and SQL definitions must be transferred and loaded correctly; filesystem access matters |
| Snapshot plus replication | Production systems that need a short final write pause | Most of the copy occurs while the source serves traffic; only the final delta is cut over | More setup, monitoring, binary-log retention, and rollback planning |
| Clone plugin | Fast provisioning between compatible MySQL server series | Designed for direct instance transfer | Donor and recipient must satisfy Clone prerequisites and be in the same server series, such as matching 8.4 patch releases; it is not a universal cross-version migration tool |
Before selecting a method, record the source and target MySQL versions, server series, operating systems, storage engines, database size, available free space, bandwidth, acceptable outage, GTID status, replication requirements, and whether users and grants must move. Decide in advance how you will return traffic to the old server if validation fails.
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Prepare both servers
Confirm connectivity and capacity
- Make sure the destination can accept connections from the source or from the host that will run the restore. A firewall rule should expose only the required MySQL port to trusted addresses.
- Verify that the target has enough space for the restored tables, indexes, temporary files, binary logs, and at least one safety copy of the dump. A compressed dump can expand several times during restore.
- Use encrypted transport for the dump stream or file transfer. If you must cross an untrusted network, use TLS for MySQL connections or a secure transfer channel such as an SSH-protected path.
- Create a dedicated migration account with only the privileges needed to read the source and create or load objects on the target. Do not reuse an application account if a narrower administrative account is practical.
Inventory objects that a data-only copy can miss
A database is more than rows. Inventory tables, views, stored procedures and functions, triggers, scheduled events, character sets, collations, users, grants, and any application configuration that refers to the old host. Include these objects in your dump options or export them separately, then check each category after the restore.
Plan for writes
A dump taken while rows are changing can be internally inconsistent unless you use an appropriate consistency strategy. For predominantly InnoDB databases, --single-transaction gives the dump a transaction-level view without taking a long table-wide write lock, while --quick streams rows instead of buffering an entire table in memory. These options do not make nontransactional tables, such as MyISAM tables, transactionally consistent; those tables require a write pause or another engine-specific approach.
Method 1: stream a logical dump directly to the new server
This is the shortest path when the source can reach the destination and the target database has already been created. The basic pattern documented by MySQL is:
mysqladmin -h target-host create db_name
mysqldump db_name | mysql -h target-host db_nameUse a production-safe dump command
For an InnoDB database, a more practical command is:
mysqldump
--single-transaction
--quick
--routines
--triggers
--events
db_name | mysql --host=target-host --user=migration_user db_nameSupply credentials through a protected client option file or an interactive prompt rather than placing a password after --password. The pipe returns control only after the dump and import have completed; watch both processes and check their exit status. Run the destination mysql client with TLS settings required by your security policy.
Include database creation statements when appropriate
If you want the dump itself to contain CREATE DATABASE and USE statements, use:
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mysqldump --databases db_name | mysql --host=target-hostFor several databases, list them after --databases:
mysqldump --databases db_one db_two | mysql --host=target-hostTo export the entire instance, MySQL provides:
mysqldump --all-databasesReview an all-database dump carefully before importing it. It can contain system schemas, accounts, replication metadata, and settings that should not be blindly overlaid on a different server.
Capture replication coordinates during the dump
If the target will become a replica, add --source-data. The dump records the source binary-log coordinates needed to issue a CHANGE REPLICATION SOURCE TO configuration after the data is loaded. On GTID-enabled servers, deliberately review the interaction with --set-gtid-purged; an automatic choice can produce an incorrect GTID history for your topology. Record the source’s GTID and binary-log policy before you start.
Method 2: create, transfer, and restore a compressed dump file
A file-based transfer is easier to resume, inspect, checksum, and retain for rollback. On the source:
mysqldump
--single-transaction
--quick
--routines
--triggers
--events
db_name | gzip > db_name.sql.gzTransfer db_name.sql.gz through an encrypted channel. Restrict its permissions because a dump can contain sensitive customer data and, if you exported them, account definitions. On the target, create the database and restore:
mysqladmin create db_name
gunzip < db_name.sql.gz | mysql db_nameThe alternative that embeds database creation is:
gunzip < db_name.sql.gz | mysqlonly when the dump was made with --databases db_name (or an equivalent multi-database option). Keep the compressed file outside web roots, encrypt it at rest when required, and delete temporary copies after verification and the agreed retention period.
Make a transfer that can be checked
Record the dump start and end times, the exact command options, the source server identity, and the file size. Generate a checksum for the file before transfer and compare it on the target. A matching checksum proves the file was not altered in transit; it does not prove that the SQL is logically complete, so row and object checks are still required.
Move users, passwords, and grants deliberately
Application data and access control are separate migration concerns. The mysql system database contains grant tables, but importing it wholesale can overwrite target accounts or server-specific metadata. First decide whether the target should preserve the same usernames, authentication plugins, password hashes, roles, and privileges.
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For each required account, capture its CREATE USER definition and its grants with SHOW GRANTS. Recreate the accounts on the target, then apply the grant statements. This approach lets you omit obsolete users and adjust host patterns for the new network. Password hashes remain protected when you use the server’s account statements rather than copying credentials into a text file.
If you import the mysql database
Only do so as a deliberate, compatible operation with a tested backup of the target’s existing system schemas. After importing grant tables, MySQL instructs administrators to run:
mysqladmin flush-privilegesThat reloads the grant tables. Test every application account after the flush; authentication failures can result from changed authentication plugins, host portions, expired passwords, or a missing role activation even when the user name is present.
Large databases: use --tab and mysqlimport
For large tables, MySQL documents a two-part logical export. On the source, write table definitions as SQL and table contents as delimited data files into a dump directory:
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mysqldump --tab=/path/to/DUMPDIR db_nameTransfer the directory’s SQL and data files to the target, create the destination database, and load the data with mysqlimport. The exact command must use the target’s database name and the options that match the delimiters, character set, and file ownership produced by your export:
mysqlimport --local db_name /path/to/DUMPDIR/*.txtReview the generated files before loading. The SQL definitions must be applied in an order that respects dependencies, and the server account performing a local import needs permission to read the files. This method can avoid replaying every row as an individual SQL INSERT, but it does not remove the need for consistency controls, validation, or a final write pause.
Minimize downtime with a staged snapshot and replication
When the database is too large for an acceptable outage, provision the target from a consistent snapshot, start replication, let it catch up, and then perform a short controlled cutover. A logical dump with --source-data can carry the binary-log coordinates needed to start the target from the snapshot point.
- Prepare the target server, replication account, firewall rules, TLS, and binary-log retention before copying data.
- Take a consistent InnoDB dump with
--single-transactionand include--source-data. Confirm how GTIDs will be purged or retained with--set-gtid-purged. - Restore the dump on the target, apply users and grants, and configure replication with the recorded coordinates or GTID settings.
- Monitor the replica’s receive and apply positions, errors, lag, and disk usage. Do not cut over while it is still missing required transactions.
- Schedule the final change window. Stop application writes or place the application in maintenance mode, wait for the target to apply the final transactions, and verify that replication has reached the planned stopping point.
- Point the application at the target, run smoke tests, and keep the old server available but read-only or isolated until rollback criteria expire.
Replication reduces the final outage but adds operational risk: a misconfigured filter, missing binary logs, or an overlooked nonreplicated object can leave the target incomplete. Treat replication status and application-level checks as separate gates.
Use Clone only for compatible same-series provisioning
The MySQL Clone plugin transfers data and replication settings directly from a donor instance to a recipient. Its remote syntax is:
CLONE INSTANCE FROM 'user'@'host':port IDENTIFIED BY 'password';Clone is attractive when direct instance transfer is faster than replaying a logical dump, but compatibility and privileges are decisive. The donor and recipient must be in the same MySQL server series, such as compatible 8.4 patch releases, and the required Clone privileges and configuration must be available. Because Clone replaces recipient data as part of provisioning, use it on a prepared target, not on a server containing data you have not backed up. Do not treat it as a general cross-version upgrade mechanism.
Validate the target before changing application traffic
Validation should compare the things the application actually depends on, not just whether the import command returned successfully.
- Schema: compare databases, tables, columns, indexes, views, routines, triggers, and events. Check engine, character set, and collation for every table where sorting or comparisons matter.
- Data: compare table counts and, for critical tables, suitable checksums or application-level totals. A row count alone can miss changed values.
- Access: test each application connection, role, grant, TLS requirement, and connection pool account from the same network locations used in production.
- Behavior: run representative reads and writes against a staging copy or controlled target session. Exercise transactions, date and time handling, Unicode text, stored routines, scheduled events, and triggers that the application uses.
- Operations: confirm backups, monitoring, log rotation, binary-log retention, alerting, and scheduled jobs on the new host.
For a replication migration, compare the target’s applied position with the source’s final position immediately before cutover. For a dump-and-restore migration, preserve the command log and checksum records with the change ticket.
Cut over with a reversible plan
- Announce the maintenance window and stop background workers that can continue writing after the web tier is paused.
- Disable application writes or put the application into maintenance mode. If using replication, wait for the final transactions to apply.
- Run the final validation: connection test, critical table counts or checksums, and a check of users and grants.
- Change the application’s connection string, secret, service discovery record, or DNS entry to the target. Reduce DNS time-to-live ahead of the window if DNS is the mechanism, but do not rely on TTL alone because clients can cache records longer.
- Perform smoke tests from the application tier, then re-enable writes and watch error rates, latency, locks, and replication or binary-log behavior.
- Keep the source intact and prevent accidental writes to it. Define a rollback deadline and the exact reverse switch before declaring the migration complete.
Rollback is simplest when the old server has remained unchanged since cutover. If new writes have reached the target, reversing traffic without reconciling those writes can lose data. Decide whether rollback means restoring the old connection, promoting a synchronized replica, or restoring from a post-cutover backup; document that choice before the window.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshoot common failures
The import stops with a permissions error
Check that the target account can create the database and all required objects, and that the account used for routines, events, triggers, and views has the needed privileges. For a file restore, verify filesystem ownership and read permissions on the dump. Re-run the failed statement after correcting the privilege, but inspect whether earlier statements committed so you do not create a partial, duplicate load.
The target rejects a character set, collation, or SQL definition
Compare source and target versions and supported collations. Create the target with an explicit default character set and collation where appropriate, and test the dump on a disposable instance before production. Do not silently convert character sets for a live migration; conversion can change comparisons or corrupt data that cannot represent the destination encoding.
The dump is inconsistent
Confirm that --single-transaction was used for InnoDB and that no process altered schema during the dump. Identify nontransactional tables and either pause writes to them or migrate them with an engine-appropriate lock or snapshot. A transaction-consistent dump does not protect against application-level assumptions spanning multiple independent databases.
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Check the recorded coordinates, GTID mode, server identifiers, binary-log availability, TLS, and replication-account grants. Inspect the first SQL error rather than repeatedly restarting the channel. A source that has already purged the required binary logs needs a new snapshot and a fresh starting position.
Users can connect but still receive “access denied”
Run SHOW GRANTS on the target and inspect the account’s host pattern. A user defined for localhost is not necessarily the same account as that username connecting from an application host. After importing grant tables, run mysqladmin flush-privileges, then verify authentication plugin compatibility and role activation.
A practical decision checklist
- Choose a streamed or compressed logical dump when portability matters and the final write pause is acceptable.
- Add
--single-transactionand--quickfor predominantly InnoDB workloads, and address nontransactional tables separately. - Use
--source-dataand deliberate GTID handling when the dump will seed replication. - Use
--tabandmysqlimportwhen very large tables make SQL insert replay the limiting step. - Use Clone only after confirming same-series compatibility, required privileges, and that the recipient can safely be overwritten.
- Export users and grants as an explicit work item; importing the
mysqldatabase is not a substitute for account review. - Validate schema, data, access, application behavior, and operational jobs before switching traffic.
- Retain the old server and a verified backup until the rollback deadline has passed.
Frequently Asked Questions
Can I migrate a MySQL database while the application stays online?
For InnoDB tables, a dump using --single-transaction can run while normal reads and writes continue, but you still need a controlled final cutover. For a very short outage, seed the target, run replication, wait for it to catch up, pause writes briefly, and switch the application.
Does mysqldump db_name copy MySQL users and grants?
No. Treat users, roles, passwords, and grants as a separate migration task. Recreate required accounts with their CREATE USER and SHOW GRANTS statements, or deliberately migrate compatible grant tables and then run mysqladmin flush-privileges.
Is MySQL Clone suitable for moving between different major versions?
Not as a general rule. Clone is intended for compatible instances in the same server series, such as compatible 8.4 patch releases. Use a logical dump or a planned replication-based upgrade when source and target versions differ.
What should I do with the old server after cutover?
Keep it unchanged and available for the agreed rollback period, prevent accidental writes, and continue backups until the target has passed application and operational checks. Destroy temporary dumps and credentials only after your retention and recovery requirements are satisfied.
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