Changing Your WordPress Domain? Protect the Database This Way

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Changing a WordPress domain does not inherently corrupt the database. The usual cause of migration damage is replacing URLs with a plain text or blanket SQL operation that fails to update PHP-serialized data correctly. Use a serialization-aware method, make a restorable backup, and preview the scope before applying changes.

Why a domain change can break database data

WordPress stores domain references in several places, including the home and siteurl options, post content, widgets, and theme or plugin settings. After a move, old references can leave links or media pointing to the previous address.

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Some stored values are PHP-serialized: they include data structures with string lengths recorded alongside the strings. If a plain replacement changes a URL but leaves its recorded length unchanged, PHP may be unable to decode that value correctly. The result can be broken settings or other unexpected behavior. WordPress warns against blanket database URL replacement for this reason: Migrating WordPress.

Changing only home and siteurl may correct the main site addresses, but it does not necessarily update every old-domain reference elsewhere in the database.

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Choose the right procedure for the change

A domain switch, a host migration, moving WordPress from a subdirectory to the site root, and correcting an incorrect URL setting are distinct tasks. Identify which applies before editing the database. The WordPress migration guide’s steps do not apply unchanged to Multisite.

For a single-site installation, WordPress distinguishes the WordPress Address—the location of the core files—from the Site Address—the public address visitors use. Set each deliberately. Include https:// when appropriate and omit the trailing slash, as described in the WordPress migration guide.

Safely update a single-site database

1. Back up the database and site files. Keep a database copy outside the live database environment, and confirm you know how to restore it before making changes. WordPress recommends preserving a database copy during migration.
2. Set the intended site addresses. Update the WordPress Address and Site Address in the appropriate configuration or admin settings for your move. If WP_HOME or WP_SITEURL is defined in wp-config.php, that constant overrides the corresponding database option; it does not change the stored option. Removing a constant later can therefore expose the old database value. See WordPress migration guidance and the wp-config.php reference.
3. Preview remaining references with a serialization-aware tool. With shell access and WP-CLI installed, run wp search-replace 'https://old.example' 'https://new.example' --dry-run from the WordPress installation. Replace the example domains with the exact old and new addresses. The --dry-run option reports proposed changes without saving them.
4. Review tables and columns before applying. WP-CLI supports table selection and exclusion options, so limit the operation to the intended scope. Do not casually rewrite the guid column: WordPress treats GUIDs as persistent identifiers used by feed readers, and its migration example excludes that column.
5. Apply or export only after review. If the preview matches the intended change, run the command without --dry-run. Alternatively, WP-CLI’s --export option writes transformed SQL for review and import rather than applying replacements directly. Consult the WP-CLI search-replace documentation for options and syntax. WP-CLI says the command “Search/replace intelligently handles PHP serialized data, and does not change primary key values.”
6. Verify the site. Check the front end, admin login, media, forms and plugin-dependent features, redirects, and permalink behavior. Review custom rewrite rules and regenerate permalinks if needed; WordPress recommends testing redirects after migration.

If you have WordPress admin access but not shell access, a migration plugin may provide a search-and-replace workflow. The Better Search Replace plugin listing describes its admin workflow and warns that incorrect replacement strings can damage the database. Confirm the tool’s scope and access requirements for your setup, and keep the backup available.

Why changing the two URL options may not be enough

The home and siteurl values control key site addresses, but old-domain references may also remain in content, options, widgets, or plugin data. A site that loads at the new address can still have broken images, links, or features if those references were not updated.

Likewise, WP_HOME and WP_SITEURL in wp-config.php override their matching options rather than migrating them. If the constants are removed after a move, the database’s prior values may take effect again.

Extra precautions for WordPress Multisite

Do not assume a single-site replacement covers a network. Multisite has additional domain and path references in network and per-site tables, and WordPress calls for manual review of network-specific data. WP-CLI requires --network to include network tables, but that flag alone is not a complete Multisite migration plan. Review each site’s settings and the network’s domain and path configuration before applying changes; see the WordPress migration guide and WP-CLI command documentation.

How to choose a replacement method

• Serialization handling: Use a method that updates serialized string lengths correctly; ordinary SQL text replacement is not appropriate for a broad replacement.
• Preview and recovery: Prefer a workflow that can preview changes or export transformed SQL, and proceed only when a tested restore path exists.
• Scope control: Check whether you can select tables or exclude columns such as guid.
• Access: WP-CLI requires shell access; an admin plugin may suit a site where you only have dashboard access, subject to its compatibility and scope.
• Network coverage: For Multisite, plan a separate review of network and per-site data rather than assuming a single-site workflow is sufficient.

There is no universally best method for every installation. The right choice depends on access, site structure, and whether the move affects a single site or a network.

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