> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/server/server-usage/storage-engines/innodb/innodb-troubleshooting.md).

# InnoDB Troubleshooting

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[InnoDB Troubleshooting Overview](/docs/server/server-usage/storage-engines/innodb/innodb-troubleshooting/innodb-troubleshooting-overview.md)
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A starting point for diagnosing InnoDB issues, recommending checks on error logs, deadlocks, and table integrity using various tools.
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[InnoDB Data Dictionary Troubleshooting](/docs/server/server-usage/storage-engines/innodb/innodb-troubleshooting/innodb-data-dictionary-troubleshooting.md)
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Learn how to resolve inconsistencies between the InnoDB internal data dictionary and the file system, such as orphan .frm or .ibd files.
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[InnoDB Recovery Modes](/docs/server/server-usage/storage-engines/innodb/innodb-troubleshooting/innodb-recovery-modes.md)
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Understand the different `innodb_force_recovery` levels, which allow you to start the server in read-only modes to recover data after a crash.
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