tarantool/tarantool

sql: auto run analyze

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#2,853 创建于 2017年10月20日

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featuregood first issueperformancesql

描述

Recently, PRAGMA optimize has been added in SQLite, which enables auto run of analyze when it is required. For instance, when several indexes of table haven't been analyzed or the number of rows in the table has increased by 25 times or more since last analyze.

More info: https://sqlite.org/pragma.html#pragma_optimize

The proposal is to implement similar feature(or just port it from the original source) in our sql.

贡献者指南

技术栈
ccpp
领域
database
议题类型
feature
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
4
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
over 1 week
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
clear
前置要求
Understanding of SQLite internalsFamiliarity with Tarantool's SQL module
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
20
研究方向
Examine SQLite's PRAGMA optimize implementation at https://sqlite.org/pragma.html#pragma optimize. Review Tarantool's SQL related source files (likely in src/sql/) to understand where to integrate similar auto analyze logic. Identify the conditions under which analyze should trigger, such as index usage or row count changes. The issue has no comments or PRs, so start by proposing a design in the issue.