40 lines
1.5 KiB
Go
40 lines
1.5 KiB
Go
// Copyright 2025 PingCAP, Inc.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package workloadlearning
|
|
|
|
import (
|
|
"time"
|
|
|
|
"github.com/pingcap/tidb/pkg/parser/ast"
|
|
)
|
|
|
|
// TableReadCostMetrics is used to indicate the intermediate status and results analyzed through table read workload
|
|
// for function "HandleTableReadCost".
|
|
type TableReadCostMetrics struct {
|
|
// TODO(Elsa): Add the json tag for the field
|
|
DbName ast.CIStr
|
|
TableName ast.CIStr
|
|
// TableScanTime[t] = sum(scan-time * readFrequency) of all records in statement_summary where table-name = t
|
|
TableScanTime time.Duration
|
|
// TableMemUsage[t] = sum(mem-usage * readFrequency) of all records in statement_summary where table-name = t
|
|
// Unit is bytes
|
|
TableMemUsage int64
|
|
// ReadFrequency[t] = sum(read-frequency) of all records in statement_summary where table-name = t
|
|
ReadFrequency int64
|
|
// TableReadCost[t] = TableScanTime[t] / totalScanTime + TableMemUsage[t] / totalMemUsage
|
|
// range between 0 ~ 2
|
|
TableReadCost float64
|
|
}
|