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A WordPress database error does not prove that MySQL crashed. First confirm whether the mysqld service stopped, then read its error log at the time of the incident. That distinction prevents you from repairing healthy tables, changing recovery settings unnecessarily, or repeatedly rebooting a VPS while the real cause—usually exhausted memory, disk space, file descriptors, a failing query, or storage corruption—remains.
Use the runbook below in order: preserve evidence, verify the service, inspect logs and VPS resources, correlate any query, address only the failure that the evidence supports, and test WordPress after MySQL is stable.
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What a WordPress “database connection” error actually tells you
Messages such as “Error establishing a database connection,” a blank site, or a report that mysqld restarted describe the symptom, not necessarily the failure. WordPress can show the same front-end message when:
- MySQL is stopped or repeatedly restarting.
- MySQL is running but the VPS has exhausted memory, process slots, or file descriptors.
- The database socket, hostname, port, credentials, or permissions are wrong.
- A table is damaged, a filesystem is full, or InnoDB cannot complete crash recovery.
- MySQL is healthy but a plugin, theme, or PHP process is throwing a separate fatal error.
The Oracle MySQL Reference Manual’s first troubleshooting instruction is to determine whether the mysqld server died or whether the problem is with the client. Treat that as the first branch of the investigation.
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Before changing anything: preserve the incident
Repeated restarts can overwrite useful log context and make a recurring failure harder to correlate. If the site is intermittently available, take a short maintenance window and capture the following before making configuration changes:
- The UTC or local time of each outage and restart.
- The exact WordPress message and any PHP fatal error.
- The MySQL error-log lines before and after the stop.
- Current memory, swap, disk, inode, CPU, and process information.
- The installed Linux, MySQL, PHP, and WordPress versions.
- The last deployment, plugin activation, import, backup, or traffic spike.
Save copied log excerpts outside the database data directory. Do not delete logs, data files, redo logs, or binary logs while diagnosing. If you have a current backup, verify when it was taken and whether it can actually be restored; “a backup job ran” is not the same as a tested recovery.
1. Confirm whether MySQL is stopped, restarting, or healthy
Service names differ by distribution and package. Debian- and Ubuntu-family systems commonly use mysql; Red Hat-family systems commonly use mysqld. Try the name your installation uses rather than assuming one path.
- Check the service state:
sudo systemctl status mysql --no-pager
orsudo systemctl status mysqld --no-pager - Inspect recent service events:
sudo journalctl -u mysql --since "2 hours ago" --no-pager
orsudo journalctl -u mysqld --since "2 hours ago" --no-pager - Check whether a server process and listening socket exist:
pgrep -a mysqldsudo ss -ltnp | grep 3306 - If the service is active, test a local connection with an account that is allowed to connect:
mysqladmin ping -u root -p
systemctl may show “active (running)” even though the process has crashed and been restarted several times. Look for a changing start time, restart counters, or repeated stop/start events in the journal. If MySQL is healthy and stable, stop treating the incident as a server crash and move to the WordPress, credentials, socket, and query branches.
2. Read the MySQL error log at the incident timestamp
The error log is the primary evidence for an unexpected exit. Common locations include /var/log/mysql/error.log and /var/log/mysqld.log; the configured location can also be found in the MySQL configuration or service startup output. Read a narrow time window first so the relevant messages are visible:
sudo tail -n 200 /var/log/mysql/error.log
sudo grep -iE "error|warning|shutdown|restart| InnoDB |out of memory|no space|corrupt|assert|signal|stack" /var/log/mysql/error.log | tail -n 200Record the exact wording, not just a paraphrase. The following patterns point to different remedies:
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Out of memory, the Linux OOM killer, or “Killed process mysqld” |
RAM or swap exhaustion, often combined with a query or other runaway process | Capture free -h, process and kernel logs; reduce the immediate load before tuning MySQL |
No space left on device, write failures, or inability to create temporary files |
Full filesystem or inode exhaustion | Check space and inodes; free only known-safe files without touching database files |
| Too many open files | File-descriptor limit or connection/table pressure | Check the service limit and connection counts before changing limits |
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| MyISAM “crashed” or “incorrect key file” messages | Damage to specific MyISAM tables | Back up first, identify the named tables, and repair only those tables with an appropriate tool |
| A clean, intentional shutdown | Administrative restart, package update, VPS reboot, or watchdog action | Correlate with system and deployment logs rather than repairing data |
| A repeatable final query followed by an abort | Query behavior, resource spike, or a server bug triggered by that statement | Capture the query safely and investigate with slow logging and EXPLAIN |
MySQL documentation notes that corrupted data or index files are common causes of unexpected exits, but a generic WordPress database message is not evidence of corruption by itself.
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3. Check the VPS resources before restarting again
Resource exhaustion is often the fastest reversible cause to confirm. Run these commands while the problem is occurring if possible, and save their output:
uptime
top
ps aux --sort=-%mem | head -n 20
free -h
swapon --show
df -h
df -i
ulimit -n
sudo systemctl show mysql -p LimitNOFILE
sudo dmesg -T | grep -iE "oom|out of memory|killed process"Memory and swap
In free -h, compare available memory—not merely the “free” column—with MySQL’s resident usage, PHP workers, web-server workers, scheduled jobs, and backup processes. A VPS can kill mysqld when total demand exceeds RAM even if MySQL’s own settings appear reasonable. Swap can soften a short burst, but it is not a substitute for adequate RAM; sustained swapping can make WordPress time out and can intensify load.
Do not respond by blindly increasing innodb_buffer_pool_size, per-connection buffers, or PHP worker counts. Per-connection settings multiply under concurrency. First identify which process consumed memory and whether a traffic burst, import, backup, or scheduled task coincided with the kill.
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Run both df -h and df -i. A filesystem can have free gigabytes but no free inodes, preventing MySQL from creating temporary tables, sockets, or logs. Check the filesystem that contains the data directory, the temporary directory, and the log directory. Rotate or remove only files you can identify as disposable—old application logs, cached artifacts, or obsolete backups. Never delete ibdata, redo logs, binary logs, table files, or an unknown file from the MySQL data directory to make space.
CPU, processes, and file descriptors
High CPU alone does not prove a crash, but a runaway PHP process, backup compressor, or import can starve MySQL. Compare top with the process list and the web-server access log. “Too many open files” requires checking the limit inherited by the service, not only your interactive shell’s ulimit. Raise limits only after measuring demand and applying a persistent service configuration; a larger limit cannot fix a query or process leak.
4. Correlate the crash with queries and traffic
If the log and resource snapshot suggest query load, establish whether one statement consistently appears immediately before the failure. MySQL’s troubleshooting guidance recommends enabling the general query log when a repeatable query is suspected. Because the general log is verbose and can add I/O and privacy exposure, enable it only for a controlled, short capture window on a maintenance instance or during a narrowly defined incident.
- Confirm where the general log will be written and that the filesystem has room.
- Enable it temporarily using the supported MySQL configuration or dynamic setting for your version.
- Reproduce the failure once, if safe, and note the final statements before the restart.
- Disable the general log immediately after capture and protect the resulting file, which may contain sensitive query data.
For load that is slow but not an immediate crash, the slow query log is safer for ongoing diagnosis. Use EXPLAIN on the identified SELECT statements and inspect missing indexes, unexpectedly large scans, sorting, temporary tables, and unbounded WordPress queries. Fix the plugin or custom code that generates the query when possible; increasing server resources may only postpone the next failure.
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Correlate database timestamps with web-server access logs, PHP-FPM logs, WP-Cron activity, imports, search-index jobs, and backups. A scheduled task that starts at the same minute as every restart is stronger evidence than a one-off query seen hours earlier.
5. Check storage and filesystem symptoms without damaging data
Storage errors can look like a MySQL crash. Inspect kernel and system logs for I/O errors, read-only remounts, filesystem errors, or a failing virtual disk. Check the health information your VPS provider exposes, but do not run a filesystem repair against a mounted, active database volume. If the host reports underlying storage problems, snapshot or copy the instance according to the provider’s documented procedure and involve the provider before destructive repair.
Verify ownership and permissions only when the log reports permission or access failures. The MySQL data directory must remain owned and accessible according to the package’s service account. Changing it recursively to an arbitrary user can prevent startup and can expose database files.
6. Repair MyISAM tables only when the log identifies corruption
MyISAM and InnoDB require different handling. If the error log names a MyISAM table as crashed, or reports errors such as “Record file is crashed” or an incorrect key file, first make or verify a current backup. Record the database and table names, and stop writes if the repair tool or your recovery plan requires it.
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For a table you have identified, inspect its status with the appropriate MySQL command or your administration tool. A command-line check can be run after authenticating:
mysqlcheck -u root -p --check database_name table_nameUse the repair option only for the named MyISAM table and only after the backup is confirmed:
mysqlcheck -u root -p --repair database_name table_nameOptions and permissions vary by MySQL version. Follow the tool’s output and keep a copy of the original error. In phpMyAdmin, select the affected database, select only the reported table, choose the repair action, and review the result. Do not select every table merely because WordPress displays a connection error.
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Repair can remove or reconstruct damaged indexes and may not recover every row. If the table contains important content, compare the repaired result with a backup and plan a restore if integrity is uncertain. If the table is InnoDB, do not apply a MyISAM repair command; use the InnoDB procedure instead.
7. Treat InnoDB startup recovery as a separate incident
InnoDB may perform crash recovery after an unclean stop. Messages such as “Starting crash recovery,” repeated recovery attempts, redo-log errors, assertions, or a server that exits during InnoDB initialization require the recovery-specific procedure in the MySQL manual for your installed version.
The safe posture is backup first and reversible steps only:
- Stop automatic restart loops if they are repeatedly starting and killing the service.
- Preserve the data directory, configuration, error log, and any available snapshot or backup. Work on a copy whenever your infrastructure permits.
- Identify the exact InnoDB error and version before setting a recovery mode. A recovery mode is an extraction aid, not a normal operating setting.
- If the server starts in a recovery mode, export the data to a clean instance as directed by the manual, then rebuild or restore rather than continuing production writes in that mode.
- Remove temporary recovery settings only after the migration or restore is complete and validated.
Never delete ibdata1, redo logs, undo files, or table-space files to force startup. Do not increase recovery levels blindly. A higher level can make the server appear to start while losing transactions or preventing normal writes, and it can reduce your recovery options.
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If systemctl, the journal, and mysqladmin ping show a stable server, test the application layer. Confirm the database host, name, user, password, socket or port, and privileges in wp-config.php. Test the same credentials from the VPS, then inspect PHP and web-server logs for connection timeouts or fatal errors.
Use WordPress Recovery Mode for plugin and theme faults
When WordPress sends a Recovery Mode link after a fatal error, use that temporary safe login path. Disable the plugin or switch the theme identified in the notice, then retest the front end and administrator. If the notice does not identify a component, disable plugins in a controlled way—through the dashboard, or by renaming the plugins directory after taking a filesystem backup—and reactivate them one at a time.
Recovery Mode makes the site accessible for isolation; it does not restart a stopped database service or repair a damaged table. If disabling a component changes nothing while MySQL remains stable, restore it and continue with PHP configuration, credentials, routing, or application logs.
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Capture PHP and WordPress evidence
On a controlled or maintenance instance, enable WordPress debugging and logging in wp-config.php:
define( 'WP_DEBUG', true );
define( 'WP_DEBUG_LOG', true );
define( 'WP_DEBUG_DISPLAY', false );Reproduce the failure once, review wp-content/debug.log alongside the MySQL and PHP logs, and then turn verbose debugging back off on a public production site. Debug output can disclose paths, SQL details, credentials in poorly written plugins, or other sensitive information.
9. Restart and validate only after the cause is understood
A service restart is reasonable after capturing evidence and correcting a reversible cause such as a full log filesystem or a stopped service. It is not a diagnosis. Restart the correct unit and immediately inspect its result:
sudo systemctl restart mysql
sudo systemctl status mysql --no-pager
mysqladmin ping -u root -pUse mysqld in place of mysql where that is your service name. Then validate in layers:
- MySQL remains active for several minutes without a restart loop.
- The error log contains no new fatal, corruption, or resource messages.
- A local authenticated query succeeds.
- WordPress can load the login page, front page, administrator, and a representative write operation.
- PHP, web-server, and database timestamps align without new timeouts.
If the service stops again, stop restarting it and return to the new error-log lines. Each cycle should add evidence; otherwise it only increases the chance of additional recovery work.
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| Remedy | Evidence required | Data risk | Reversibility | What it addresses |
|---|---|---|---|---|
| Free known-safe disk or log space | Filesystem or inode exhaustion | Low when database files are excluded | Usually reversible, although deleted logs are not recoverable | Storage pressure |
| Stop a runaway process and restart MySQL | Process, OOM, or restart-loop evidence | Low to moderate; unclean stops can trigger recovery | High | Resource exhaustion and service state |
| Tune memory, workers, or file limits | Measured saturation and a known limiting setting | Moderate if settings are excessive | High when changes are documented | Capacity and concurrency |
| Capture and optimize a query | Query log or slow-log correlation | Low for logging; application changes need testing | High with version control and rollback | Query behavior and load |
| Repair a named MyISAM table | Error log identifies table corruption | Moderate; rows or indexes may be lost | Limited without a backup | MyISAM corruption |
| InnoDB recovery or restore | Startup recovery failure or InnoDB corruption evidence | High; recovery settings and extraction can affect data | Only with a preserved copy and rollback plan | InnoDB recovery and storage corruption |
| Disable a plugin or theme | Stable MySQL plus a WordPress/PHP fatal | Low at the database layer | High | Application code |
Prevent another VPS crash
- Maintain current database backups. Keep backups separate from the VPS when possible, retain more than one recent restore point, and periodically test restoring to an isolated instance.
- Monitor memory and disk. Alert before the data filesystem, log filesystem, or inode pool is exhausted. Include swap activity, load, and restart counts.
- Review logs after updates. Check MySQL, PHP, web-server, and system logs after operating-system, MySQL, PHP, plugin, and theme changes.
- Control scheduled work. Stagger backups, imports, search indexing, WP-Cron jobs, and other memory- or I/O-heavy tasks instead of allowing them to overlap.
- Keep versions documented. Record the exact Linux distribution, MySQL or compatible server version, PHP version, WordPress version, storage layout, and relevant configuration. Version-specific recovery instructions matter.
- Preserve exact errors. When escalating to your VPS provider or database support, include timestamps, the unedited error excerpt, resource snapshots, recent changes, and what you already tried.
The durable fix is the one that explains the log evidence: reclaim capacity for an exhausted VPS, optimize or limit a query that triggers load, repair only a table proven corrupt, follow the InnoDB recovery path for an InnoDB failure, or isolate WordPress code when the database never actually stopped.
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