pingcap / pingcap/tidb

Failed to add foreign key due to "ERROR 8175 (HY000): Your query has been cancelled"

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#65,069 2 comments 0 reactions 0 assignees View on GitHub
affects-8.5 component/ddl severity/major type/bug
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Description

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)

1. create tidb cluster v8.5.4 ( tidb * 2 on 16c32g, tikv * 3 on 16c32g )
2. br restore db benchmarksql-tpcc-1k
3. delete all foreign key
4. `set global tidb_mem_quota_query=84825604096;`
5. add foreign key `h_customer_fkey`
```sql
ALTER TABLE `bmsql_history` ADD CONSTRAINT `h_customer_fkey` FOREIGN KEY (`h_c_w_id`, `h_c_d_id`, `h_c_id`) REFERENCES `bmsql_customer` (`c_w_id`, `c_d_id`, `c_id`)
```

### 2. What did you expect to see? (Required)

no error.

### 3. What did you see instead (Required)

```
ERROR 8175 (HY000): Your query has been cancelled due to exceeding the allowed memory limit for a single SQL query. Please try narrowing your query scope or increase the tidb_mem_quota_query limit and try again.[conn=0]
```

### 4. What is your TiDB version? (Required)

v8.5.4

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