验证集群运行状态

本文档介绍如何通过 TiDB Dashboard 和 Grafana 检查集群状态,以及登录数据库执行简单 DML、DDL 操作和查询 SQL 语句。

通过 TiDB Dashboard 和 Grafana 检查集群状态

本节介绍如何通过 TiDB Dashboard 和 Grafana 检查集群状态。

查看 TiDB Dashboard 检查 TiDB 集群状态

  1. 通过 {pd-ip}:{pd-port}/dashboard 登录 TiDB Dashboard,登录用户和口令为 TiDB 数据库 root 用户和口令。如果你修改过数据库的 root 密码,则以修改后的密码为准,默认密码为空。

    TiDB-Dashboard

  2. 主页面显示 TiDB 集群中节点信息

    TiDB-Dashboard-status

查看 Grafana 监控 Overview 页面检查 TiDB 集群状态

  • 通过 {Grafana-ip}:3000 登录 Grafana 监控,默认用户名及密码为 admin/admin

    Grafana-login

  • 点击 Overview 监控页面检查 TiDB 端口和负载监控信息。

    Grafana-overview

登录数据库执行简单 DML/DDL 操作和查询 SQL 语句

注意:

登录数据库前,你需要安装 MySQL 客户端。

执行如下命令登录数据库:

mysql -u root -h 10.0.1.4 -P 4000

输出下列信息表示登录成功:

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.25-TiDB-v4.0.0 TiDB Server (Apache License 2.0) Community Edition, MySQL 5.7 compatible

Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

数据库操作

  • 检查 TiDB 版本

    select tidb_version()\G
    

    预期结果输出:

    *************************** 1. row ***************************
    tidb_version(): Release Version: v4.0.0
    Edition: Community
    Git Commit Hash: 689a6b6439ae7835947fcaccf329a3fc303986cb
    Git Branch: HEAD
    UTC Build Time: 2020-05-28 11:09:45
    GoVersion: go1.13.4
    Race Enabled: false
    TiKV Min Version: v3.0.0-60965b006877ca7234adaced7890d7b029ed1306
    Check Table Before Drop: false
    1 row in set (0.00 sec)
    
  • 创建 PingCAP database

    create database pingcap;
    
    Query OK, 0 rows affected (0.10 sec)
    
    use pingcap;
    

    预期输出

    Database changed
    
  • 创建 tab_tidb

    CREATE TABLE `tab_tidb` (
    `id` int(11) NOT NULL AUTO_INCREMENT,
    `name` varchar(20) NOT NULL DEFAULT '',
    `age` int(11) NOT NULL DEFAULT 0,
    `version` varchar(20) NOT NULL DEFAULT '',
    PRIMARY KEY (`id`),
    KEY `idx_age` (`age`));
    

    预期输出

    Query OK, 0 rows affected (0.11 sec)
    
  • 插入数据

    insert into `tab_tidb` values (1,'TiDB',5,'TiDB-v4.0.0');
    

    预期输出

    Query OK, 1 row affected (0.03 sec)
    
  • 查看 tab_tidb 结果

    select * from tab_tidb;
    

    预期输出

    +----+------+-----+-------------+
    | id | name | age | version     |
    +----+------+-----+-------------+
    |  1 | TiDB |   5 | TiDB-v4.0.0 |
    +----+------+-----+-------------+
    1 row in set (0.00 sec)
    
  • 查看 TiKV store 状态、store_id、存储情况以及启动时间

    select STORE_ID,ADDRESS,STORE_STATE,STORE_STATE_NAME,CAPACITY,AVAILABLE,UPTIME from INFORMATION_SCHEMA.TIKV_STORE_STATUS;
    

    预期输出

    +----------+--------------------+-------------+------------------+----------+-----------+--------------------+
    | STORE_ID | ADDRESS            | STORE_STATE | STORE_STATE_NAME | CAPACITY | AVAILABLE | UPTIME             |
    +----------+--------------------+-------------+------------------+----------+-----------+--------------------+
    |        1 | 10.0.1.1:20160 |           0 | Up               | 49.98GiB | 46.3GiB   | 5h21m52.474864026s |
    |        4 | 10.0.1.2:20160 |           0 | Up               | 49.98GiB | 46.32GiB  | 5h21m52.522669177s |
    |        5 | 10.0.1.3:20160 |           0 | Up               | 49.98GiB | 45.44GiB  | 5h21m52.713660541s |
    +----------+--------------------+-------------+------------------+----------+-----------+--------------------+
    3 rows in set (0.00 sec)
    
  • 退出

    exit
    

    预期输出

    Bye