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Redis慢查询日志(Slow Log)详解
慢查询日志主要用于记录Redis实例中执行时间超过指定阈值的命令。它的码日使用场景包括对Redis实例性能监控与问题定位,有助于快速识别并优化那些执行效率低下的码日Redis命令。
慢查询日志的码日obd 上位机 源码相关配置主要有:slowlog-log-slower-than,表示执行时间超过此值(单位为毫秒)的码日命令会被记录;slowlog-max-len,表示日志最多保存的码日网页中文源码加密命令条数,遵循先进先出原则。码日
配置慢查询日志的码日方式包括在redis.conf文件中设置,或通过动态配置命令CONFIG SET进行调整,码日重启Redis实例生效。码日
通过SLOWLOG GET命令可以获取最新count条慢查询日志,码日不指定count时默认返回条记录。码日利用SLOWLOG LEN命令可以查询日志长度,码日linux内核源码解析SLOWLOG RESET命令则用于清空日志内容。码日
慢查询日志的码日获取与分析可以结合其他命令如GREP、LIMIT等进行,mfc游戏源码下载实现更精确的日志过滤和分析。
文章深入浅出地介绍了慢查询日志的原理,包括其数据结构和慢日志记录的php发帖回帖源码调用链分析。通过理解这些原理和源码版本(以6.2.5为例),读者能够全面掌握慢查询日志的实现机制。
慢查询日志是Redis性能调优的重要工具,合理配置它可以帮助快速定位并优化Redis实例中的慢查询问题,提高系统整体性能。综上所述,慢查询日志的使用、配置、命令操作以及基本原理解析,对于理解和利用Redis性能监控工具提供了全面的指导。
å°åºå¦ä½å¨springä¸ä½¿ç¨redis
1. Redis使ç¨åºæ¯
Redisæ¯ä¸ä¸ªå¼æºç使ç¨ANSI Cè¯è¨ç¼åãæ¯æç½ç»ãå¯åºäºå å亦å¯æä¹ åçæ¥å¿åãKey-Valueæ°æ®åºï¼å¹¶æä¾å¤ç§è¯è¨çAPIã
æ们é½ç¥éï¼å¨æ¥å¸¸çåºç¨ä¸ï¼æ°æ®åºç¶é¢æ¯æ容æåºç°çãæ°æ®é太大åé¢ç¹çæ¥è¯¢ï¼ç±äºç£çIOæ§è½çå±éæ§ï¼å¯¼è´é¡¹ç®çæ§è½è¶æ¥è¶ä½ã
è¿æ¶åï¼åºäºå åçç¼åæ¡æ¶ï¼å°±è½è§£å³æ们å¾å¤é®é¢ãä¾å¦Memcacheï¼Redisçãå°ä¸äºé¢ç¹ä½¿ç¨çæ°æ®æ¾å ¥ç¼å读åï¼å¤§å¤§éä½äºæ°æ®åºçè´æ ãæåäºç³»ç»çæ§è½ã
å ¶å®ï¼å¯¹äºhibernateçäºçº§ç¼åï¼æ¯åæ ·çéçãå©ç¨å åé«éç读åé度ï¼æ¥è§£å³ç¡¬ççç¶é¢ã
2. é 置使ç¨redis
é¦å ï¼æ们éè¦å¼å ¥åºæ¬çjarå ãmavenä¸çåºæ¬å¼ç¨å¦ä¸ï¼
ãããã<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-redis</artifactId>
<version>1.4.2.RELEASE</version>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.6.2</version>
</dependency>
ç¶åï¼å¨applicationContextä¸é ç½®å¦ä¸:
<bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">
<property name="maxIdle" value="${ redis.maxIdle}" />
<property name="maxTotal" value="${ redis.maxActive}" />
<property name="maxWaitMillis" value="${ redis.maxWait}" />
<property name="testOnBorrow" value="${ redis.testOnBorrow}" />
</bean>
<bean id="connectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory" p:host-name="${ redis.host}" p:port="${ redis.port}" p:password="${ redis.pass}"
p:pool-config-ref="poolConfig" />
<bean id="stringSerializer" class="org.springframework.data.redis.serializer.StringRedisSerializer"/>
<!-- å¼å¯äºå¡ï¼å¯ä»¥éè¿transcational注解æ§å¶ -->
<bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
<property name="connectionFactory" ref="connectionFactory" />
<property name="keySerializer" ref="stringSerializer" />
<property name="enableTransactionSupport" value="true" />
</bean>
对äºhibernateçé ç½®å¯ç¥ï¼ç¬¬ä¸ä¸ªpoolconfigæ¯å¯¹è¿æ¥æ± çé ç½®ãå æ¬æ大è¿æ¥æ°ï¼éåæ°ï¼åæ´»æ¶é´ï¼æ大çå¾ æ¶é´ççï¼è¿æä¸äºé¢å¤çé ç½®ï¼è¯·ç´æ¥ç¹å»JedisPoolConfigç±»æºç ï¼è¿è¡æ¥çã
è¿äºé ç½®çææå¦æä¸æç½çè¯ï¼ä¸å®è¦å»æ线ç¨æ± 好好å¦ä¹ ä¸ã
第ä¸ä¸ªé ç½®æ¯è¿æ¥å·¥åï¼é¡¾åæä¹ï¼æåºæ¬ç使ç¨ä¸å®æ¯å¯¹è¿æ¥çæå¼åå ³éãæ们éè¦ä¸ºå ¶é ç½®redisæå¡å¨çè´¦æ·å¯ç ï¼ç«¯å£å·ãï¼è¿éè¿å¯ä»¥é ç½®æ°æ®åºçindexï¼ä½æ¯æ使ç¨æ¶åä¸ç´ä½¿ç¨redisçé»è®¤æ°æ®åºï¼ä¹å°±æ¯ç¬¬0个ï¼
æåä¸ä¸ªé ç½®ç¹å«éè¦ãè¿ä¸ªç±»ä¼¼äºspringæä¾çHibernateDaoSupportã
æ¥ä¸æ¥ï¼å ¨é¨è®²è§£é½å°å´ç»è¿ä¸ªç±»å±å¼ã
3. RedisTemplateç使ç¨
è¿ä¸ªç±»ä½ä¸ºä¸ä¸ªæ¨¡çç±»ï¼æä¾äºå¾å¤å¿«é使ç¨redisçapiï¼èä¸éè¦èªå·±æ¥ç»´æ¤è¿æ¥ï¼äºå¡ã
æåçæ¶åï¼æå建çBaseRedisDaoæ¯ç»§æ¿èªè¿ä¸ªç±»çã继æ¿ç好å¤æ¯æçæ¯ä¸ªDaoä¸ï¼é½å¯ä»¥èªç±çæ§å¶åºååå¨ï¼èªç±çæ§å¶èªå·±æ¯å¦éè¦äºå¡ï¼è¿ä¸ªå ä¸éè¦äºè§£ï¼è·çæç®åçè¿ç§é ç½®æ¹æ³æ¥å³å¯ã
templateæä¾äºä¸ç³»åçoperation,æ¯å¦valueOperation,HashOperation,ListOperation,SetOperationçï¼ç¨æ¥æä½ä¸åæ°æ®ç±»åçRedisã
并ä¸ï¼RedisTemplateè¿æä¾äºå¯¹åºç*OperationsEditorï¼ç¨æ¥éè¿RedisTemplateç´æ¥æ³¨å ¥å¯¹åºçOperationãæ们ææ¶ä¸è®²è¿ä¸ªã
对äºä¸é¢çtest1æ¹æ³ï¼æ们ææ¶ä¸ç¨èèï¼å äºè§£éè¿RedisTemplateæ¥ä½¿ç¨connectionæä½Redisã
Test代ç å¦ä¸ï¼
package cn.test.spjedis;
import javax.annotation.Resource;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.DataAccessException;
import org.springframework.data.redis.connection.RedisConnection;
import org.springframework.data.redis.core.RedisCallback;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import com.cn.redis2.dao.IncrDao;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:applicationContext.xml")
public class TestRedis {
@Resource(name = "redisTemplate")
private RedisTemplate<String, String> template; // inject the template as ListOperations
//è³äºè¿ä¸ªä¸ºä»ä¹å¯ä»¥æ³¨å ¥ãéè¦åèAbstractBeanFactory doGetBean
//super.setValue(((RedisOperations) value).opsForValue());å°±è¿ä¸è¡ä»£ç ä¾é ä¸ä¸ªeditor
@Resource(name = "redisTemplate")
private ValueOperations<String, Object> vOps;
public void testSet(){
template.execute(new RedisCallback<Boolean>() {
@Override
public Boolean doInRedis(RedisConnection connection) throws DataAccessException {
byte [] key = "tempkey".getBytes();
byte[] value = "tempvalue".getBytes();
connection.set(key, value);
return true;
}
});
}
public void testSet1(){
vOps.set("tempkey", "tempvalue");
}
@Autowired
private IncrDao incr;
@Test
public void addLink() {
System.out.println(incr.incr());
System.out.println(incr.get());
}
}
è¿ä¸ªæ¯å¯¹Stringç±»åæå ¥ç两个æµè¯ãtestæ¹æ³ä¸ï¼ä½¿ç¨äºæ¨¡çç±»æ交åè°(RedisCallBack)çæ¹æ³æ¥ä½¿ç¨jedis connectionæä½æ°æ®ãè¿ä¸é¨åï¼æ没æä¼¼æ¾ç¸è¯å¢ï¼
HibernateTemplateçHibernateCallbackï¼ä»¥åHibernate Sessionç±»ä¸çdoWork以ådoReturningWorkæ¹æ³ï¼é½æ¯ä½¿ç¨äºè¿æ ·çæºå¶ï¼æ¹ä¾¿å¯¹äºè¿æ¥æè sessionçç»ä¸ç®¡çã
public int excuteHqlUpdate(final String hql,final Object ...params){
return getHibernateTemplate().executeWithNativeSession(new HibernateCallback<Integer>() {
@Override
@SuppressWarnings("unchecked")
public Integer doInHibernate(Session session) throws HibernateException {
Query queryObject = session.createQuery(hql);
if (params != null) {
for (int i = 0; i < params.length; i++) {
queryObject.setParameter(i, params[i]);
}
}
return queryObject.executeUpdate();
}
});
}