tidb oom when running `ch` and `go-ycsb` workload

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)
1. tidb cluster in k8s, including tidb 8c 30g *6
2. running ch workload: `/go-tpc ch run --host *** -P 4000 --warehouses 2000 -T 16 -D longrun_tpcc --acThreads 0 --ignore-error` and randomly execute query in `q1,q2,q3,q4,q5,q6,q7,q8,q10,q11,q12,q13,q14,q15,q16,q17,q18,q19,q20,q21,q22,q23`
3. running `go-ycsb` workload: `/go-ycsb run mysql -P "./workloads/betting" --threads=500 -p "mysql.host=***" -p "mysql.port=4000" -p "operationcount=9223362036854775807" -p "dbnameprefix=betting_" -p "tablecount=2000" -p "unitnameprefix=unit2_" -p "databaseproportions=1.0" -p "unitscount=10"`

### 2. What did you expect to see? (Required)
1. running with no error
### 3. What did you see instead (Required)
1. tidb in oom
### 4. What is your TiDB version? (Required)

Release Version: v6.4.0-alpha
Edition: Community
Git Commit Hash: 85b53e18781d459074f1637998014b37231283b0
Git Branch: heads/refs/tags/v6.4.0-alpha
UTC Build Time: 2022-10-22 11:09:50
GoVersion: go1.19.1
Race Enabled: false
TiKV Min Version: 6.2.0-alpha
Check Table Before Drop: false
Store: tikv