A repair command can rebuild indexes or mark a table usable without fixing the event that damaged it. If errors return, suspect disk pressure, abrupt MySQL shutdowns, storage faults, an incompatible repair method or application code that repeatedly damages data.
Stop treating each recurrence as isolated. Preserve a timeline and protect current data before another repair.
Compare each recurrence
Record table, MySQL error code, exact time, feature and repair output for every incident. Determine whether the same table/index fails or damage moves.
Timeline:
first error
repair method/result
server restart/disk event
next write activity
recurrence time
table engineRedact query values and customer data.
Verify backups are usable
Take a current logical dump where possible and retain a known pre-incident backup. Read dump errors; “completed” does not guarantee every table exported.
Test restoration to an isolated database/server. Confirm table counts and application access.
Do not keep all backups on the same failing disk or overwrite the last known-good copy.
Check disk and filesystem health
Inspect free space, inode usage, MySQL data/log filesystem and hosting storage alerts. A full volume can interrupt writes and crash tables.
On a VPS, review kernel/storage error logs through an authorised administrator. On managed hosting, request provider evidence.
Freeing space may stop immediate failures but does not prove the disk is healthy.
Review MySQL shutdown history
Look for unclean shutdown, crash recovery, OOM kill and forced restart around each recurrence. MySQL should shut down cleanly before server maintenance.
Do not restart repeatedly as a diagnostic. Capture memory, process and error-log state first.
If backups or imports overlap resource peaks, reschedule and bound them.
Match repair method to engine
MyISAM repair tools are not the solution for InnoDB corruption. wp-admin/maint/repair.php calls database-level checks but cannot repair hardware or every InnoDB failure.
SHOW TABLE STATUS LIKE 'wp_example';
CHECK TABLE wp_example;Use explicit tables and an authorised read-only first pass. Escalate InnoDB engine errors to the host/database administrator.
Inspect recurring application writes
A plugin may run schema changes repeatedly, write oversized data or terminate mid-migration. Match the table owner and modification times with cron/update logs.
Disable the implicated scheduled migration on staging and reproduce. Update or replace abandoned code.
Do not delete the table unless its data is confirmed reconstructable and the vendor documents recreation.
Check memory and database capacity
Operating-system OOM kills, maxed connections and long locks can lead to abrupt service failure. Review RAM, swap, MySQL buffer configuration and concurrent workloads.
Tune from measured workload rather than copying generic settings. Increasing buffers beyond physical RAM can worsen crashes.
Keep web and backup jobs from consuming every resource MySQL needs.
Add post-repair observation
After recovery, record table size, row count, MySQL uptime, free disk and the last clean shutdown. Run controlled writes to the affected feature and check the error log after each cycle.
Avoid continuous aggressive CHECK TABLE jobs on large production tables; they can create their own load. Use a schedule based on the engine and host guidance, and alert on the original error fingerprint, disk threshold and unclean restart rather than waiting for visitors to find the broken feature again.
Restore, repair and monitor
Correct the underlying storage, capacity or application cause before the final repair/restore. Put the site in an appropriate write-safe maintenance mode during recovery.
Verify the affected feature, recent records and new writes, then monitor MySQL logs and table checks over several cycles.
Recurring care should test restores and alert on disk/OOM/unclean shutdown. Success means the error remains absent because the damaging condition is gone, not because the repair button can be pressed again.