MySQL Memory存储引擎的优势及性能测试
本篇内容主要讲解“MySQL Memory存储引擎的优势及性能测试”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“MySQL Memory存储引擎的优势及性能测试”吧!
测试脚本：
/******************************************************MYSQL STORAGE ENGINE TESThttp://wu-jian.cnblogs.com/2011-11-29******************************************************/CREATE DATABASE IF NOT EXISTS testCHARACTER SET 'utf8'COLLATE 'utf8_general_ci';USE test;/******************************************************1.INNODB******************************************************/DROP TABLE IF EXISTS test_innodb;CREATE TABLE IF NOT EXISTS test_innodb (id INT UNSIGNED AUTO_INCREMENT COMMENT 'PK',obj CHAR(255) NOT NULL DEFAULT '' COMMENT 'OBJECT', PRIMARY KEY (id)) ENGINE=INNODB;/******************************************************2.MYISAM******************************************************/DROP TABLE IF EXISTS test_myisam;CREATE TABLE IF NOT EXISTS test_myisam (id INT UNSIGNED AUTO_INCREMENT COMMENT 'PK',obj CHAR(255) NOT NULL DEFAULT '' COMMENT 'OBJECT',PRIMARY KEY (id)) ENGINE=MYISAM;/******************************************************1.MEMORY******************************************************/DROP TABLE IF EXISTS test_memory;CREATE TABLE IF NOT EXISTS test_memory (id INT UNSIGNED AUTO_INCREMENT COMMENT 'PK',obj CHAR(255) NOT NULL DEFAULT '' COMMENT 'OBJECT',PRIMARY KEY (id)) ENGINE=MEMORY;测试代码：
using System;using System.Data;using MySql.Data.MySqlClient;namespace MySqlEngineTest{class Program{const string OBJ = "The MEMORY storage engine creates tables with contents that are stored in memory. Formerly, these were known as HEAP tables. MEMORY is the preferred term, although HEAP remains supported for backward compatibility.";const string SQL_CONN = "Data Source=127.0.0.1;Port=3308;User ID=root;Password=root;DataBase=test;Allow Zero Datetime=true;Charset=utf8;pooling=true;"; const int LOOP_TOTAL = 10000;const int LOOP_BEGIN = 8000;const int LOOP_END = 9000; #region Database Functions public static bool DB_InnoDBInsert(string obj){string commandText = "INSERT INTO test_innodb (obj) VALUES (?obj)";MySqlParameter[] parameters = { new MySqlParameter("?obj", MySqlDbType.VarChar, 255) }; parameters[0].Value = obj; if (DBUtility.MySqlHelper.ExecuteNonQuery(SQL_CONN, CommandType.Text, commandText, parameters) > 0)return true; elsereturn false;} public static string DB_InnoDBSelect(int id){ string commandText = "SELECT obj FROM test_innodb WHERE id = ?id";MySqlParameter[] parameters = { new MySqlParameter("?id", MySqlDbType.Int32)};parameters[0].Value = id;return DBUtility.MySqlHelper.ExecuteScalar(SQL_CONN, CommandType.Text, commandText, parameters).ToString();} public static bool DB_MyIsamInsert(string obj){string commandText = "INSERT INTO test_myisam (obj) VALUES (?obj)";MySqlParameter[] parameters = {new MySqlParameter("?obj", MySqlDbType.VarChar, 255) }; parameters[0].Value = obj; if (DBUtility.MySqlHelper.ExecuteNonQuery(SQL_CONN, CommandType.Text, commandText, parameters) > 0)return true;elsereturn false; } public static string DB_MyIsamSelect(int id){string commandText = "SELECT obj FROM test_myisam WHERE id = ?id"; MySqlParameter[] parameters = { new MySqlParameter("?id", MySqlDbType.Int32)};parameters[0].Value = id;return DBUtility.MySqlHelper.ExecuteScalar(SQL_CONN, CommandType.Text, commandText, parameters).ToString(); } public static bool DB_MemoryInsert(string obj){string commandText = "INSERT INTO test_memory (obj) VALUES (?obj)";MySqlParameter[] parameters = {new MySqlParameter("?obj", MySqlDbType.VarChar, 255) }; parameters[0].Value = obj;if (DBUtility.MySqlHelper.ExecuteNonQuery(SQL_CONN, CommandType.Text, commandText, parameters) > 0) return true;elsereturn false;} public static string DB_MemorySelect(int id){string commandText = "SELECT obj FROM test_memory WHERE id = ?id"; MySqlParameter[] parameters = { new MySqlParameter("?id", MySqlDbType.Int32)};parameters[0].Value = id;return DBUtility.MySqlHelper.ExecuteScalar(SQL_CONN, CommandType.Text, commandText, parameters).ToString();} #endregion#region Test Functions InnoDBstatic void InnoDBInsert(){ long begin = DateTime.Now.Ticks;for (int i = 0; i < LOOP_TOTAL; i++) {DB_InnoDBInsert(OBJ);} Console.WriteLine("InnoDB Insert Result: {0}", DateTime.Now.Ticks - begin);} static void InnoDBSelect(){long begin = DateTime.Now.Ticks;for (int i = LOOP_BEGIN; i < LOOP_END; i++){ DB_InnoDBSelect(i); } Console.WriteLine("InnoDB SELECT Result: {0}", DateTime.Now.Ticks - begin); } static void MyIsamInsert() { long begin = DateTime.Now.Ticks;for (int i = 0; i < LOOP_TOTAL; i++) {DB_MyIsamInsert(OBJ); } Console.WriteLine("MyIsam Insert Result: {0}", DateTime.Now.Ticks - begin);} static void MyIsamSelect() { long begin = DateTime.Now.Ticks;for (int i = LOOP_BEGIN; i < LOOP_END; i++){ DB_MyIsamSelect(i); }Console.WriteLine("MyIsam SELECT Result: {0}", DateTime.Now.Ticks - begin);} static void MemoryInsert(){ long begin = DateTime.Now.Ticks; for (int i = 0; i < LOOP_TOTAL; i++) { DB_MemoryInsert(OBJ);}Console.WriteLine("Memory Insert Result: {0}", DateTime.Now.Ticks - begin);} static void MemorySelect(){ long begin = DateTime.Now.Ticks; for (int i = LOOP_BEGIN; i < LOOP_END; i++){DB_MemorySelect(i);} Console.WriteLine("Memory SELECT Result: {0}", DateTime.Now.Ticks - begin);} static void DataTableInsertAndSelect(){//InsertDataTable dt = new DataTable(); dt.Columns.Add("id", Type.GetType("System.Int32"));dt.Columns["id"].AutoIncrement = true;dt.Columns.Add("obj", Type.GetType("System.String")); DataRow dr = null; long begin = DateTime.Now.Ticks; for (int i = 0; i < LOOP_TOTAL; i++){dr = null; dr = dt.NewRow(); dr["obj"] = OBJ;dt.Rows.Add(dr); } Console.WriteLine("DataTable Insert Result: {0}", DateTime.Now.Ticks - begin); //Selectlong begin1 = DateTime.Now.Ticks;for (int i = LOOP_BEGIN; i < LOOP_END; i++){ dt.Select("id = " + i);} Console.WriteLine("DataTable Select Result: {0}", DateTime.Now.Ticks - begin1); } #endregionstatic void Main(string[] args){InnoDBInsert();InnoDBSelect(); //restart mysql to avoid query cacheMyIsamInsert();MyIsamSelect();//restart mysql to avoid query cacheMemoryInsert();MemorySelect();DataTableInsertAndSelect();}}//end class} 总结
.Net Cache读写性能毫无疑问大大领先于数据库引擎
InnoDB写入耗时大概是MyIsam和Memory的5倍左右，它的行锁机制必然决定了写入时的更多性能开销，而它的强项在于多线程的并发处理，而本测试未能体现其优势。
三种数据库引擎在SELECT性能上差不多，Memory稍占优，同样高并发下的比较有待进一步测试。
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