Enable Encryption for Disk Spill

When the system variable tidb_enable_tmp_storage_on_oom is set to ON, if the memory usage of a single SQL statement exceeds the limit of the system variable tidb_mem_quota_query, some operators can save the intermediate results during execution as a temporary file to the disk and delete the file after the query is completed.

You can enable encryption for disk spill to prevent attackers from accessing data by reading these temporary files.

Configure

To enable encryption for the disk spill files, you can configure the item spilled-file-encryption-method in the [security] section of the TiDB configuration file.

[security]
spilled-file-encryption-method = "aes128-ctr"

Value options for spilled-file-encryption-method are aes128-ctr and plaintext. The default value is plaintext, which means that encryption is disabled.