Occasionally I get an ERROR 1015 (HY000): Can't lock file (errno: 157) on one of my cluster SQL nodes. Even a simple query gives the sample problem. Cluster stops giving this error after it has been restarted. This usually happens after a prolonged period of inactivity. My server is ...
Can't find file: './mysql/host.frm' Franklyn Halamka June 23, 2010 11:01PM Re: Can't find file: './mysql/host.frm' Lee Stigile June 24, 2010 11:00AM Re: Can't find file: './mysql/host.frm' Franklyn Halamka June 24, 2010 11:23AM ...
038 如何查看一个表的索引? show index from t_emp; // 显示表上的索引 explain select * from t_emp where id=1; // 显示可能会用到的索引及最终使用的索引 1. 2. 039 能否查看到索引选择的逻辑?是否使用过optimizer_trace? set session optimizer_trace="enabled=on",end_markers_in_json=on; SELECT...
log_output 表示日志的存储方式,log_output='FILE' 表示将日志存入文件,log_output='TABLE' 表示将日志存入数据库,这样日志信息就会被写入到 mysql.slow_log 表中,默认值是 'FILE'。 MySQL 数据库支持同时两种日志存储方式,配置的时候以逗号隔开即可,如:log_output='FILE,TABLE'。日志记录到系统的专用日志表中,...
1054错误：程序文件跟数据库有冲突，请使用正确的程序文件上传上去覆盖。1065：无效的SQL语句，SQL语句为空 1081：不能建立S ocket连接 1114：数据表已满，不能容纳任何记录 1116：打开的数据表太多 ...
show indexfromt_emp;// 显示表上的索引explainselect*fromt_empwhereid=1;// 显示可能会用到的索引及最终使用的索引 039 能否查看到索引选择的逻辑?是否使用过optimizer_trace? setsession optimizer_trace="enabled=on",end_markers_in_json=on;SELECT*FROMinformation_schema.OPTIMIZER_TRACE;setsession optimizer...
1mysql>create database school; 如果有了在创建就会报错2ERROR1007(HY000): Can't create database'school'; database exists3mysql>CREATE DATABASE IF NOT EXISTS school;4Query OK,1row affected,1warning (0.00sec)56mysql>CREATE DATABASE IF NOT EXISTS school;7Query OK,1row affected,1warning (0.00...
[IP: 198.18.0.39 443] Reading package lists… Done E: The repository ‘https://download.docker.com/linux/ubuntu bionic Release’ no longer has a Release file. N: Updating from such a repository can’t be done securely, and is therefore disabled by default. N: See apt-secure(8) man...
To reproduce with the RQG: perl runall.pl \ --mysqld=--loose-innodb-lock-wait-timeout=5 \ --mysqld=--table-lock-wait-timeout=5 \ --mysqld=--loose-skip-safemalloc \ --grammar=conf/bug50396.yy \ --gendata=conf/transactions.zz \ --reporters=Deadlock,ErrorLog,Backtrace,Shutdown ...
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