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幫助中心 > 技術(shù)知識庫 > 數據庫 > 相關(guān)技術(shù)支持 > 適合mysql 5.6與5.7內存參數優(yōu)化內存占用為30MB左右

適合mysql 5.6與5.7內存參數優(yōu)化內存占用為30MB左右

2019-10-22 17:09:11 7197

mysql 5.6、5.7默認啟動(dòng)占用內存400多M，如果是vps等小內存應用，mysql內存占用率明顯偏高,將會(huì )導致崩潰，mysql會(huì )自動(dòng)停止。編輯/etc/my.cnf文件在[mysqld]下增加或修改如下參數

performance_schema_max_table_instances = 200

table_definition_cache = 100

table_open_cache = 100。

這個(gè)三個(gè)參數，調低值后內存能明顯減小，現在mysql使用內存約60MB左右，就大大降低默認使用的內存。

進(jìn)一步調整參數

innodb_buffer_pool_size=2M

這個(gè)三個(gè)參數可以調小。再進(jìn)一步調整： mysql 5.6默認啟用performance_schema，占用很多內存，可以禁用。

完整配置文件如下，內存占用到22M

我的mysql配置如下，如果你使用的centos6 64位，并且是yum安裝的（一鍵腳本)可以自己按照如下照抄，我的是centos6 64位系統

先ssh登錄服務(wù)器或VPS，在vi /etc/my.cnf

# For advice on how to change settings please see

# http://www.tjdsmy.cn/doc/refman/5.6/en/server-configuration-defaults.html

[mysqld]

#

# Remove leading # and set to the amount of RAM for the most important data

# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.

# innodb_buffer_pool_size = 128M

#

# Remove leading # to turn on a very important data integrity option: logging

# changes to the binary log between backups.

# log_bin

#

# Remove leading # to set options mainly useful for reporting servers.

# The server defaults are faster for transactions and fast SELECTs.

# Adjust sizes as needed, experiment to find the optimal values.

# join_buffer_size = 128M

# sort_buffer_size = 2M

# read_rnd_buffer_size = 2M

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

#symbolic-links=0

skip-external-locking

key_buffer_size = 8M

max_allowed_packet = 1M

table_open_cache = 4

sort_buffer_size = 64K

read_buffer_size = 256K

read_rnd_buffer_size = 256K

net_buffer_length = 2K

thread_stack = 240K

#innodb_use_native_aio = 0

innodb_buffer_pool_size=2M

performance_schema_max_table_instances=50

table_definition_cache=50

table_open_cache=32

max_connections=50

max_user_connections=35

wait_timeout=10

interactive_timeout=15

long_query_time=5

# Disabling symbolic-links is recommended to prevent assorted security risks

symbolic-links=0

# Recommended in standard MySQL setup

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

[mysqld_safe]

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

默認值如下：

performance_schema_max_table_instances 12500

table_definition_cache 1400

table_open_cache 2000

參數含義

performance_schema_max_table_instances

The maximum number of instrumented table objects. table_definition_cache

The number of table definitions (from .frm files) that can be stored in the definition cache table_open_cache

The number of open tables for all threads

提交成功！非常感謝您的反饋，我們會(huì )繼續努力做到更好！

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在文檔使用中是否遇到以下問(wèn)題：

內容錯誤更新不及時(shí) 鏈接錯誤缺少代碼/圖片示例太簡(jiǎn)單/步驟待完善其他

<input type="hidden" name="referer" value="http://www.baidu.com" />
		<input type="hidden" name="star" value="" />
		<input type="hidden" id="url" value="/index/help/feedback.html?type=0" />
		<input type="button" class="solved-btn ld-reset" value="取消">
	</div>
</form>

<link rel="stylesheet" >

<style type="text/css">
  .nc-container #nc_2_wrapper, .nc-container.tb-login #nc_2_wrapper {width: 350px !important;}
  #login-ewm{width: 520px; height: 420px; position: fixed; left: 50%; top: 50%; margin: -210px 0 0 -260px;z-index: 111111111;}
  #login-ewm .close{width:40px;height:40px;position: absolute;right: 0;top: 0; background: url("data:image/png;base64,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") center no-repeat; background-size: 20px auto; cursor: pointer;}
  #wx_login_img_show{position: fixed;left: 50%;top: 50%;margin: -185px 0 0 -150px;}
</style>

<div   class="1bpdjsc"   id="login-box" style="display:none" data-ajaxurl="/index/user/laylogin.html"  action="/index/user/loginform.html">
  <div   id="x8yy1h3"   class="pop-login" id="pop-form">
    <div   id="ucuifsz"   class="account-login">
      <h1 class="cloumn">會(huì )員登錄<a onclick="closeAll()"><i ></i></a></h1>
      <div   class="8gq4f67"   id="login_form">
        <span id="szfldv3"    class="errorInfo"></span>
        
        <div   id="dcujtgw"   class="acc_num" style="display: none;">
          <div   id="qpq39om"   class="group name"><input type="text" id="username" data-regex="username" placeholder="用戶(hù)名/郵箱"></div>
          <div   id="1oluj4b"   class="group pwd"><input type="password" id="password" minlength="6" placeholder="登錄密碼"></div>
        </div>

<div   id="0uiyz6a"   class="phone">
          <div   id="wng6faq"   class="group tel"><input type="text" id="username-phone" data-regex="username" placeholder="手機號碼"></div>
          <div   id="sz3bjsk"   class="group pwd"><input type="password" id="password-phone" minlength="6" placeholder="登錄密碼"></div>
        </div>

<div   class="rqip3ea"   id="mpanel1"></div>
		  <input type="hidden" name="code" id="verify_code" value="">

<div   id="zy6iwij"   class="go-reg">
          <a href="javascript:void(0)" id="login-way">賬號或郵箱登錄</a>
          <p>還沒(méi)有賬號？立即 <a href="/user/register">免費注冊</a></p>
        </div>
        <input type="hidden" id="state" value="9e523db0af9279e91f2dad13b85afbc3" />

<input type="hidden" name="login_type" id="login_type" value="phone" />

<input type="submit" id="layer_submit"  value="登錄" data-ajaxurl="/index/user/laylogin.html">
      </div>
      <div   id="fej50ro"   class="other">其他賬戶(hù)快捷登錄：
        <a href="/index/quicklogin/qq.html" class="qq"></a>
        <a onclick="shoEwm()" class="weixin"></a>
        <a style=" float: right;color: #015bfe;" href="/index/user/repwd.html" >忘記密碼？</a>
      </div>
    </div>
  </div>
</div>

<div   class="ucu98ym"   id="login-ewm" style="display: none;">
  <span id="39c8gpp"    class="close" onclick="codeClose()"></span>
  <div   class="u3qo1dj"   id="wx_login_img_show"></div>
</div>

<script type="text/javascript" src="http://static.landui.com/statics/js/plugin/guide.js"></script>

<script src="http://static.landui.com/statics/js/common/crypto-js.js"></script>

<script src="http://static.landui.com/statics/js/common/wxLogin.js"></script>

<script src="http://static.landui.com/statics/code/js/verify.js"></script>

<script>
    LD.validater.initValidate();  //初始化表單
    /* 彈框賬號登錄和二維碼登錄切換*/
    function  shoEwm () {
      $('.account-login').hide();
      var load = layer.load();

$('.ewm-login').show();
		layer.close(load);

$.get('/index/user/wechatShowImg', function (res) {
		  new WxLogin({
			  id: "wx_login_img_show",
			  appid: "wxe021b18e33abbf1c",
			  scope: "snsapi_login",
			  redirect_uri: res.url,
			  state: res.state,
			  style: '',
			  href: ''
		  })

// 二維碼區域
		  $('#login-ewm').show()
	  })
    }

function closeEwm(){
      $('.account-login').show();
      $('.ewm-login').hide();
      $('#login-ewm').hide()
    }

function closeAll() {
      $("#verify_code").val(''); // 關(guān)閉窗口時(shí) 清空驗證碼
      LD.tip.closeAll();
    }

function codeClose()
	{
		$('#login-ewm').hide()
		$('.account-login').show();
		LD.tip.closeAll()
	}

</script>

<link rel="stylesheet" href="/statics/sc/lib/layui/css/layui.css?v=__VERSION__" media="all">
<script src="http://static.landui.com/statics/sc/lib/layui/layui.js?v=__VERSION__"></script>
<script>

$(function () {
		$('.solved-no').show();
		//用戶(hù)點(diǎn)擊有幫助
		$('.btn-smile2').click(function () {
			feedback(1);
		});
		$(":submit[id=ld-btn]").click(function(check){
			feedback(0);
			var blankH = $('.blank-height').height();
			if (blankH - 442 <= 1109){
				$('.rightBlank').css('height','1109px')
			} else {
				var blankH1 = blankH - 442 + 60;
				$('.rightBlank').css('height',blankH1);
			}
			return false;
		});
		//用戶(hù)點(diǎn)擊取消提交
		$('.ld-reset').click(function () {
			$('.solved-no').css('display','none');
			$('.solved-info').css('display','none');
			var blankH = $('.blank-height').height();
			if (blankH - 442 <= 1109){
				$('.rightBlank').css('height','1109px')
			} else {
				var blankH1 = blankH - 442;
				$('.rightBlank').css('height',blankH1)
			}

});

})
	layui.use('rate', function(){
		var rate = layui.rate;
		//渲染
		var ins1 = rate.render({
			elem: '#star'  //綁定元素
			,setText: function(value){
				var arrs = {
					'1': '極差'
					,'2': '差'
					,'3': '中等'
					,'4': '好'
					,'5': 'very good'
				};
				this.span.text(arrs[value] || ( value + "星"));
			}
			,choose: function(value){
				$("input[name='star']").val(value);
				console.log(star)
				// feedback(3);
			}
		});
	});

// type   0:提交反饋  1：有幫助  2：小心心
	function feedback(type=0) {
		var url = $("#url").val();
		var islogin = true;
		var post = $("#dataForm").serialize();

LD.ajax.post(url, post, function (data) {
			console.log(data);
			if (data.info.status == "nologin") {
				console.log("未登錄");
				front.login.show(function () {
				});//如果沒(méi)有登錄則彈出登錄框
				return false;
			}
			if (type == 1){
				$('#solved-btn').hide();
				$('#submit-success').show();
			}
			if (data.info.status == 'success'){
				$('#submit-success').show();
				$("#solved-btn").hide();
				$('.solved-no').css('display','none');
				// layer.alert('感謝您的反饋，反饋我們已經(jīng)收到')
			}
			return true;
		});
		return islogin;
	}

</script>

</div>




















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