mysql性能优化---explain详解 1.explain作用 explain语句提供了MySQL如何执行语句的信息。解释选择、删除、插入、替换和更新语句如何工作。 2.如何使用 explain your command; select_type...查看原文MySQL执行计划 号) 使用explain执行计划分析: select_type - 查询类型 table - 表名 type ...
2.如何使用 explain your command; select_type explain执行计划 like ‘innoDB_row_%’ 定位低效sql语句 show PROCESSLIST 执行计划explain 在sql前加上explain explain select * from person 其中select_type的含义table的含义表名type的含义key的含义row的含义 扫描的数量extra的含义 MySQL执行计划 号) 使用...
While working on Linux platform all of us need help on shell commands, at some point of time. Although inbuilt help likeman pages,whatiscommand is helpful, but man pages output are too lengthy and until and unless one has some experience with Linux, it is very difficult to get any help ...
“All the best people in life seem to likeLINUX.” —Steve Wozniak Recent Posts What is IIT Full Form? How to Check the Linux Version From Command Line How to Delete a Directory in Linux How to Copy and Rename a File in Linux?
Linux: 方法一:全局变量设置 将slow_query_log 全局变量设置为“ON”状态 mysql> set global slow_query_log='ON'; 设置慢查询日志存放的位置 mysql> set global slow_query_log_file='/usr/local/mysql/data/slow.log'; 查询超过1秒就记录 mysql> set global long_query_time=1; ...
db2 import from myfile of ixf messages msg replace into tb1 34.导出数据库的所有表数据 db2move test export 35.生成数据库的定义 db2look -d db_alias -a -e -m -l -x -f -o db2look.sql 36.创建数据库 db2 create db test1 37.生成定义 ...
| cleaning up | 0.000018 | dispatch_command | sql_parse.cc | 1417 | +---+---+---+---+---+ 25 rows in set (0.00 sec) 1 mysql> show profile sourceforquery 2; 1 2 3 4 5 6 7 8 9 10 11 12 13 +---+---+---+...
Explain what the following Linux tar command does: tar cvfz arch5.tar.gz somedir/ Linux Commands: Linux Commands are commands or instructions that are used to perform various tasks in Linux distributions. Commands are typed in the Command Line Interface or terminal. Commands ar...
Run the EXPLAIN.DDL command file: CONNECT TOdatabase-namedb2 -tf EXPLAIN.DDL This command file creates explain tables under the current schema. The location of this command file depends on the operating system, as illustrated in the following table: ...
[Explaining command] findomain -t DOMAIN -q | httpx -silent -threads 1000 | gau | grep "=" | qsreplace http://YOUR.burpcollaborator.netShuffleDNS to domains in file scan nuclei.[Explaining command] xargs -a domain -I@ -P500 sh -c 'shuffledns -d "@" -silent -w words.txt -r ...