pingcap/tidb

UCP: Persist statement summary tables on disk

Open

#14,888 建立於 2020年2月21日

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component/infoschemahelp wantedtype/enhancement

描述

Description

Is your feature request related to a problem? Please describe:

Statement summary tables are memory tables and only provide performance data over recent hours. But in productive environment, we need to query earlier performance data and the data before the server restarts.

Describe the feature you'd like:

Persist statement summary tables on disk periodically. The save interval can't be too short, otherwise it will impact performance.

Describe alternatives you've considered:

  • Provide a tool to extract the data and save it on other places. It's not good because it complicate deployment.
  • Save the data on disks in TiDB server. It's not good because we need to define a customized format.

Score

  • 2996

Mentor

  • @djshow832

Contact the mentors: #tidb-challenge-program channel in TiDB Community Slack Workspace

Recommended Skills

  • Golang programming
  • SQL executor
  • TiDB DDL
  • TiKV Storage
  • MySQL performance schema

Learning Materials

貢獻者指南

技術棧
gosql
領域
database
議題類型
feature
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
5
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
over 1 week
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
stale
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
Golang programmingSQL executorTiDB DDLTiKV Storage
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
15
研究方向
Study the current implementation of statement summary tables in TiDB, which are memory only. Review the TiDB documentation and code related to these tables. Investigate how other system tables are persisted in TiDB for patterns. Consider the alternatives listed in the issue and why they were rejected. Contact the mentor @djshow832 for further guidance. No existing PRs or discussion to build upon.