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a. show tables»òshow tables from database_name; // ÏÔʾµ±Ç°Êý¾Ý¿âÖÐËùÓбíµÄÃû³Æ
   b. show databases; // ÏÔʾmysqlÖÐËùÓÐÊý¾Ý¿âµÄÃû³Æ
   c. show columns from table_name from database_name; »òshow columns from database_name.table_name;   // ÏÔʾ±íÖÐÁÐÃû³Æ
   d. show grants for user_name@localhost;   //   ÏÔʾһ¸öÓû§µÄȨÏÞ£¬ÏÔʾ½á¹ûÀàËÆÓÚgrant ÃüÁî
   e. show index from table_name;   // ÏÔʾ±íµÄË÷Òý
   f. show status;   // ÏÔʾһЩϵͳÌض¨×ÊÔ´µÄÐÅÏ¢£¬ÀýÈ磬ÕýÔÚÔËÐеÄÏß³ÌÊýÁ¿
   g. show variables; // ÏÔʾϵͳ±äÁ¿µÄÃû³ÆºÍÖµ
  
   h. show   processlist; // ÏÔʾϵͳÖÐÕýÔÚÔËÐеÄËùÓнø³Ì£¬Ò²¾ÍÊǵ±Ç°ÕýÔÚÖ´ÐеIJéѯ¡£´ó¶àÊýÓû§¿ÉÒԲ鿴
         ËûÃÇ×Ô¼ºµÄ½ø³Ì£¬µ«ÊÇÈç¹ûËûÃÇÓµÓÐprocessȨÏÞ£¬¾Í¿ÉÒԲ鿴ËùÓÐÈ˵Ľø³Ì£¬°üÀ¨ÃÜÂë¡£
   i. show table status; // ÏÔʾµ±Ç°Ê¹ÓûòÕßÖ¸¶¨µÄdatabaseÖеÄÿ¸ö±íµÄÐÅÏ¢¡£ÐÅÏ¢°üÀ¨±íÀàÐͺͱíµÄ×îиüÐÂʱ¼ä
   j. show privileges;   // ÏÔʾ·þÎñÆ÷ËùÖ§³ÖµÄ²»Í¬È¨ÏÞ
   k. show create database database_name; // ÏÔʾcreate database Óï¾äÊÇ·ñÄܹ»´´½¨Ö¸¶¨µÄÊý¾Ý¿â
   l. show create table table_name; // ÏÔʾcreate database Óï¾äÊÇ·ñÄܹ»´´½¨Ö¸¶¨µÄÊý¾Ý¿â
   m. show engies;   // ÏÔʾ°²×°ÒÔºó¿ÉÓõĴ洢ÒýÇæºÍĬÈÏÒýÇæ¡£
   n. show innodb status; // ÏÔʾinnoDB´æ´¢ÒýÇæµÄ״̬
   o. show logs; // ÏÔʾBDB´æ´¢ÒýÇæµÄÈÕÖ¾
   p. show warnings; // ÏÔʾ×îºóÒ»¸öÖ´ÐеÄÓï¾äËù²úÉúµÄ´íÎó¡¢¾¯¸æºÍ֪ͨ
   q. show errors; // Ö»ÏÔʾ×îºóÒ»¸öÖ´ÐÐÓï¾äËù²úÉúµÄ´íÎó


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The security settings could not be applied to the database because the connection has failed with the following error.
Error Nr. 2003
Can't connect to MySQL server on 'localhost' (10061)
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