### 16.4.1 Repairing and Checking CSV Tables

 The `CSV` storage engine supports the [`CHECK TABLE`](check-table.html) and [`REPAIR TABLE`](repair-table.html) statements to verify and, if possible, repair a damaged `CSV` table.

 When running the [`CHECK TABLE`](check-table.html) statement, the `CSV` file is checked for validity by looking for the correct field separators, escaped fields (matching or missing quotation marks), the correct number of fields compared to the table definition and the existence of a corresponding `CSV` metafile. The first invalid row discovered causes an error. Checking a valid table produces output like that shown here:

```
mysql> CHECK TABLE csvtest;
+--------------+-------+----------+----------+
| Table        | Op    | Msg_type | Msg_text |
+--------------+-------+----------+----------+
| test.csvtest | check | status   | OK       |
+--------------+-------+----------+----------+
```

 A check on a corrupted table returns a fault such as

```
mysql> CHECK TABLE csvtest;
+--------------+-------+----------+----------+
| Table        | Op    | Msg_type | Msg_text |
+--------------+-------+----------+----------+
| test.csvtest | check | error    | Corrupt  |
+--------------+-------+----------+----------+
```

 To repair a table, use [`REPAIR TABLE`](repair-table.html), which copies as many valid rows from the existing `CSV` data as possible, and then replaces the existing `CSV` file with the recovered rows. Any rows beyond the corrupted data are lost.

```
mysql> REPAIR TABLE csvtest;
+--------------+--------+----------+----------+
| Table        | Op     | Msg_type | Msg_text |
+--------------+--------+----------+----------+
| test.csvtest | repair | status   | OK       |
+--------------+--------+----------+----------+
```

Warning

 During repair, only the rows from the `CSV` file up to the first damaged row are copied to the new table. All other rows from the first damaged row to the end of the table are removed, even valid rows.

