Copying to tmp table on disk花费了大量的时间。 结果查找资料后 了解到 发现mysql可以通过变量tmp_table_size和max_heap_table_size来控制内存表大小上限,如果超过上限会将数据写到磁盘上,从而会有物理磁盘的读写操作,导致影响性能。 调整参数配置之后 就不会有这个问题了。 To set max_heap_table_size to 64M...
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| 471 | echina | localhost | echinacities | Query|21 | Locked| | 499 | echina | localhost | echinacities | Query|22 | Copying to tmp table | | 545 | echina | localhost | echinacities | Query|22 | Locked| | 569 | echina | localhost | echinacities | Query|22 | Locked| |...
Copying to tmp table on disk The temporary result set was larger than tmp_table_size and the thread is now changing the in memory-based temporary table to a disk based one to save memory. 哦,原来是这样的,如果查询超出了tmp_table_size的限制,那么mysql用/tmp保存查询结果,然后返回给客户端。 s...
windows server,无论修改my.ini的tmp_table_size,max_heap_table_size到多少,情况都一样。同样的表和查询语句,在本地运行,没出现慢查询。 SELECT g.goods_id, g.goods_name, g.shop_price, g.goods_thumb, SUM(og.goods_number) AS goods_number FROM `chinaetm`.`ecs_goods` AS g, `chinaetm`.`ec...
I'm having a problem in some queries that still at the status Copying to tmp table. I'm running MySQL 4.1.16 on Windows 2003 at a HP Proliant ML 370 with 4GB RAM and a XEON dual processor. This is my "my.ini" file: # MySQL Server Instance Configuration File ...
Copyingto tmp table on disk服务器正在复制到磁盘上的临时表。 Creatingindex线程正在处理ALTER TABLE...ENABLE KEYS一个MyISAM表。 Creatingsort index线程正在处理SELECT使用内部临时表解析的线程 。 creating table线程正在创建一个表。这包括创建临时表。
Copying to tmp table on disk 临时结果集太大,内存中放不下,需要将内存中的临时表拷贝到磁盘上,形成 #sql***.MYD、#sql***.MYI(在5.6及更高的版本,临时表可以改成InnoDB引擎了,可以参考选项 default_tmp_storage_engine ) 建议: 创建适当的索引,并且适当加大 sort_buffer_size/tmp_...
(已解决)mac安装mysql出现:ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/my... 2019-09-27 14:26 −使用brew安装mysql后出现这个报错;解决方法:1、直接使用mysql.server start启动2、mysql -uroot -h127.0.0.1 -p(直接回车不用输入密码)... ...
> | Copying to tmp table | 14.084764 | without elaborating on whether that is MEMORY, MyISAM in RAM, or MyISAM spilled to disk. Sorry, you can't reply to this topic. It has been closed.