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/**
*
* ˵Ã÷£º
* £¨1£©±¾ÀýʹÓÃJDBC_ODBCÇŽøÐÐÊý¾Ý¿âÁ¬½Ó£¬¹Ê´ËÐèÒªODBCÊý¾ÝÔ´
* £¨2£©±¾ÀýÖÐSQLΪ¸üÐÂÓï¾ä£¬¹Ê´ËʹÓÃÔØÌåµÄexecuteUpdate·½·¨£¬²¢ÇÒ·µ»ØÊÜÓ°Ïì¼Ç¼Êý
* (3) ÅäÖÃÁ¬½ÓORACLEµÄodbcÊý¾ÝÔ´ora
*/
//µ¼ÈëËùÐèÀà°ü
import java.sql.*;
public class JdbcTestOra2 {
public static void main(String args[]) {
    try {
      //×°ÔØÇý¶¯³ÌÐò
      Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
     
      //½¨Á¢Êý¾Ý¿âÁ¬½Ó
      Connection con =
DriverManager.getConnection("jdbc:odbc:ora","scott","tiger");
     
      //´´½¨SQLÓï¾äÔØÌå
      Statement st = con.createStatement();
     
      //Ö´ÐÐSQLÓï¾ä£¬½ÓÊÕÖ´Ðнá¹û
      int rs = st.executeUpdate("update emp set
comm=1000");
           
      //´¦Àí½á¹û
      System.out.println("Ð޸ļǼÊý£º"+rs);
     
      //ÊÍ·ÅÊý¾Ý¿â×ÊÔ´£¬×¢Òâ˳Ðò
      st.close();
      con.close();           
    }
    catch (Exception e) {
      e.printStackTrace(System


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 update usertable u set u.grade =
 (select g.grade from grade g where g.userid = u.userid);
 
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select rownum, t.* from sm_t_pad_new t
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Oracle & SUN£¬ÑϾþµÄÌôÕ½£¨Ò»£©

      ½ñÌì²Î¼ÓÁËOracle & SUNºÏ²¢ºóµÚÒ»´ÎÓëºÏ×÷»ï°é¼°¿Í»§µÄÍ¨Æø»á¡£Õû¸ö»áÒ鏸ÎҵĸоõÊÇ£ºOracleÐÛÐIJª²ª£¬SUNÒâÆø·ç·¢£¬¶øÎÒ×Ô¼º£¬ÐÄ»³ã·ã·¡£       OracleÓÐÁËSUN£¬ÄÇô´ÓÓ²¼þµ½Èí¼þOracleµÄ²úÆ·Ïß¾ÍÊ®·ÖÆë±¸ÁË¡£Oracle°ëÄêÇ°ÍÆ³ö11gR2 for linux£¬½Ó×Åfor solar ......

ÓÅ»¯select count(*) (תoracleÅàѵÀÏʦµÄÎÄÕÂ)


select count(*) from t1;
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SQL> conn scott/tiger
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SQL> drop table t1 purge;
±íÒÑɾ³ý¡£
SQL> create table t1 as select * from emp where 0=9;
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SQL> insert into t1 sele ......

OracleºÍMySQL¡¢PostgreSQLÌØÐÔ¶Ô±È

¡¡Ëæ×ÅÏÖ´úÊý¾Ý¿â¿ÉÓÃÌØÕ÷¼¯µÄѸËÙÔö¼Ó£¬ºÜÄÑÇø·ÖÊëºÃÊ뻵¡£ÀýÈçOracleÀï¾ÍÓÐÐí¶àÄã¿ÉÄÜ´ÓÀ´¶¼²»ÐèÒªµÄ¸ß¼¶Êý¾Ý²Ö¿âÌØÕ÷¡£´ËÍâÒ²¿ÉÄÜÓÐһЩÆäËü²»¿É»òȱµÄÌØÕ÷±ÈÈçACIDÊÂÎñÌØÐÔ¡£ÎÒÃÇÀ´¿´Ò»¿´Ö÷ÒªµÄÒ»Ð©ÌØÕ÷£¬±ÈÈç´æ´¢¹ý³Ì£¬ÊÓͼ£¬¿ìÕÕ£¬±íÊý¾ÝÀàÐͺÍÊÂÎñµÈµÈ¡£Í¬Ê±ÎÒÃÇ·ÖÎöÒ»ÏÂPostgresql£¬MySQLºÍOracleÕ⼸¸öÊý¾Ý¿â£¬È»º ......

Oracle wait problems and potential solutions

Wait Problem Potential Fix Sequential Read Indicates many index reads—tune the code (especially joins) Scattered Read Indicates many full table scans—tune the code; cache small tables ......
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