{"id":739,"date":"2013-02-26T12:55:22","date_gmt":"2013-02-26T04:55:22","guid":{"rendered":"http:\/\/www.yallonking.com\/?p=739"},"modified":"2013-02-26T12:58:55","modified_gmt":"2013-02-26T04:58:55","slug":"%e5%a4%96%e9%94%ae%e7%bc%ba%e5%a4%b1%e7%b4%a2%e5%bc%95%e5%af%bc%e8%87%b4%e9%94%81%e8%a1%a8%e7%9a%84%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"http:\/\/www.yallonking.com\/?p=739","title":{"rendered":"\u5916\u952e\u7f3a\u5931\u7d22\u5f15\u5bfc\u81f4\u9501\u8868\u7684\u95ee\u9898"},"content":{"rendered":"<p>\u5916\u952e\u7f3a\u5931\u7d22\u5f15\u5bfc\u81f4\u9501\u8868\u7684\u95ee\u9898<br \/>\n\t\u4e00\u822c\u5efa\u8bae\u5728\u5916\u952e\u4e0a\u6dfb\u52a0B\u6811\u7d22\u5f15\uff0c\u5982\u679c\u6ca1\u6709B\u6811\u7d22\u5f15\uff0c\u90a3\u4e48\u53ef\u80fd\u5728\u5bf9\u5b50\u8868\u64cd\u4f5c\u65f6\uff0c\u9020\u6210\u4e3b\u8868\u9501\u5b9a\u3002\u4ee5\u4e0b\u4fbf\u662f\u9a8c\u8bc1\u5b50\u8868\u5b58\u5728\u672a\u51b3\u4e8b\u52a1\uff0c\u5bf9\u4e3b\u8868\u7684\u589e\u5220\u6539\u662f\u5426\u4f1a\u56e0\u6b64\u53d7\u5230\u5f71\u54cd\u3002<br \/>\n\t<strong>\u7ed3\u8bba\uff1a<br \/>\n        \u5b50\u8868\u7684\u5916\u952e\u5217\u4e0a\u6ca1\u6709\u7d22\u5f15\u65f6\uff0c\u53d1\u73b0\u5b50\u8868\u5b58\u5728\u672a\u51b3\u4e8b\u52a1\u65f6\uff0c\u4e3b\u8868\u7684\u589e\u52a0\u4e0d\u4f1a\u53d7\u5230\u5f71\u54cd\uff0c\u4f46\u662f\u5220\u9664\u548c\u4fee\u6539\u4f1a\u53d7\u5230\u5f71\u54cd\u3002<br \/>\n\t\u5b50\u8868\u7684\u5916\u952e\u5217\u4e0a\u521b\u5efaB\u6811\u7d22\u5f15\u540e\uff0c\u53d1\u73b0\u5b50\u8868\u5b58\u5728\u672a\u51b3\u4e8b\u52a1\u65f6\uff0c\u4e3b\u8868\u7684\u589e\u5220\u6539\u4e0d\u4f1a\u53d7\u5230\u5f71\u54cd\u3002<br \/>\n\t\u5b50\u8868\u7684\u5916\u952e\u5217\u4e0a\u521b\u5efa\u4f4d\u56fe\u7d22\u5f15\u540e\uff0c\u53d1\u73b0\u5b50\u8868\u5b58\u5728\u672a\u51b3\u4e8b\u52a1\u65f6\uff0c\u4e3b\u8868\u7684\u589e\u5220\u6539\u53d7\u5230\u7684\u5f71\u54cd\u548c\u672a\u52a0\u7d22\u5f15\u4e00\u81f4\u3002<\/strong><\/p>\n<p>\u67e5\u770b\u6d4b\u8bd5\u8868<\/p>\n<pre class=\"wp-code-highlight prettyprint\">\r\nSQL&gt; select * from emp;\r\n\r\n     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO\r\n---------- ---------- --------- ---------- --------- ---------- ---------- ----------\r\n      7369 SMITH      CLERK           7902 17-DEC-80        800                    20\r\n      7499 ALLEN      SALESMAN        7698 20-FEB-81       1600        300         30\r\n      7521 WARD       SALESMAN        7698 22-FEB-81       1250        500         30\r\n      7566 JONES      MANAGER         7839 02-APR-81       2975                    20\r\n      7654 MARTIN     SALESMAN        7698 28-SEP-81       1250       1400         30\r\n      7698 BLAKE      MANAGER         7839 01-MAY-81       2850                    30\r\n      7782 CLARK      MANAGER         7839 09-JUN-81       2450                    10\r\n      7788 SCOTT      ANALYST         7566 19-APR-87       3000                    20\r\n      7839 KING       PRESIDENT            17-NOV-81       5000                    10\r\n      7844 TURNER     SALESMAN        7698 08-SEP-81       1500          0         30\r\n      7876 ADAMS      CLERK           7788 23-MAY-87       1100                    20\r\n      7900 JAMES      CLERK           7698 03-DEC-81        950                    30\r\n      7902 FORD       ANALYST         7566 03-DEC-81       3000                    20\r\n      7934 MILLER     CLERK           7782 23-JAN-82       1300                    10\r\n\r\n14 rows selected.\r\n\r\nSQL&gt; select * from dept;\r\n\r\n    DEPTNO DNAME          LOC\r\n---------- -------------- -------------\r\n        10 ACCOUNTING     NEW YORK\r\n        20 RESEARCH       DALLAS\r\n        30 SALES          CHICAGO\r\n        40 OPERATIONS     BOSTON\r\n<\/pre>\n<p><strong>\u67e5\u770b\u8be5\u6a21\u5f0f\u4e0b\u7684\u90a3\u4e9b\u5916\u952e\u7f3a\u5931\u7d22\u5f15<\/strong><\/p>\n<pre class=\"wp-code-highlight prettyprint\">\r\nSQL&gt;     column columns format a30 word_wrapped\r\nSQL&gt;     column tablename format a15 word_wrapped\r\nSQL&gt;     column constraint_name format a15 word_wrapped\r\nSQL&gt;      \r\nSQL&gt;     select table_name,\r\n  2             constraint_name,\r\n  3             cname1 || nvl2(cname2, &#039;,&#039; || cname2, null) ||\r\n  4             nvl2(cname3, &#039;,&#039; || cname3, null) ||\r\n  5             nvl2(cname4, &#039;,&#039; || cname4, null) ||\r\n  6             nvl2(cname5, &#039;,&#039; || cname5, null) ||\r\n  7             nvl2(cname6, &#039;,&#039; || cname6, null) ||\r\n  8             nvl2(cname7, &#039;,&#039; || cname7, null) ||\r\n  9             nvl2(cname8, &#039;,&#039; || cname8, null) columns\r\n 10        from (select b.table_name,\r\n 11                     b.constraint_name,\r\n 12                     max(decode(position, 1, column_name, null)) cname1,\r\n 13                     max(decode(position, 2, column_name, null)) cname2,\r\n 14                     max(decode(position, 3, column_name, null)) cname3,\r\n 15                     max(decode(position, 4, column_name, null)) cname4,\r\n 16                     max(decode(position, 5, column_name, null)) cname5,\r\n 17                     max(decode(position, 6, column_name, null)) cname6,\r\n 18                     max(decode(position, 7, column_name, null)) cname7,\r\n 19                     max(decode(position, 8, column_name, null)) cname8,\r\n 20                     count(*) col_cnt\r\n 21                from (select substr(table_name, 1, 30) table_name,\r\n 22                             substr(constraint_name, 1, 30) constraint_name,\r\n 23                             substr(column_name, 1, 30) column_name,\r\n 24                             position\r\n 25                        from user_cons_columns) a,\r\n 26                     user_constraints b\r\n 27               where a.constraint_name = b.constraint_name\r\n 28                 and b.constraint_type = &#039;R&#039;\r\n 29               group by b.table_name, b.constraint_name) cons\r\n 30       where col_cnt &gt; ALL (select count(*)\r\n 31                from user_ind_columns i\r\n 32               where i.table_name = cons.table_name\r\n 33                 and i.column_name in (cname1,\r\n 34                                       cname2,\r\n 35                                       cname3,\r\n 36                                       cname4,\r\n 37                                       cname5,\r\n 38                                       cname6,\r\n 39                                       cname7,\r\n 40                                       cname8)\r\n 41                 and i.column_position &lt;= cons.col_cnt\r\n 42               group by i.index_name);\r\n\r\nTABLE_NAME                     CONSTRAINT_NAME COLUMNS\r\n------------------------------ --------------- ------------------------------\r\nEMP                            FK_DEPTNO       DEPTNO\r\n\r\n<\/pre>\n<p>\u6ce8\u610f\uff1a\u6b64\u5904\u53d1\u73b0\u5b50\u8868emp\u7684\u5916\u952e\u5217deptno\u7f3a\u5931\u7d22\u5f15<\/p>\n<p>\u6d4b\u8bd51\uff1a\u5b50\u8868\u5b58\u5728\u672a\u51b3\u4e8b\u52a1\uff0c\u5bf9\u7236\u8868\u8fdb\u884c\u63d2\u5165\u64cd\u4f5c<br \/>\n\u4f1a\u8bdd1\u5220\u9664\u5b50\u8868\u4e00\u6761\u8bb0\u5f55\uff0c\u5e76\u4e0d\u63d0\u4ea4<\/p>\n<pre class=\"wp-code-highlight prettyprint\">\r\nSQL&gt; select sid from v$mystat where rownum&lt;2;\r\n\r\n       SID\r\n----------\r\n       159\r\n\r\nSQL&gt; delete from emp where EMPNO=7369;\r\n\r\n1 row deleted.\r\n<\/pre>\n<p>\u6d4b\u8bd5\u4f1a\u8bdd2\u63d2\u5165\u4e00\u6761\u65b0\u8bb0\u5f55\u5230\u7236\u8868\u662f\u5426\u6210\u529f<\/p>\n<pre class=\"wp-code-highlight prettyprint\">\r\nSQL&gt; select sid from v$mystat where rownum&lt;2;\r\n\r\n       SID\r\n----------\r\n       149\r\n\r\nSQL&gt; insert into dept values(50,&#039;yallonking&#039;,&#039;yallonking&#039;);\r\n\r\n1 row created.\r\n\r\n<\/pre>\n<p>\u6d4b\u8bd52\uff1a\u5b50\u8868\u5b58\u5728\u672a\u51b3\u4e8b\u52a1\uff0c\u5bf9\u7236\u8868\u8fdb\u884c\u5220\u9664\u64cd\u4f5c<br \/>\n\u4f1a\u8bdd1\u5220\u9664\u5b50\u8868\u4e00\u6761\u8bb0\u5f55\uff0c\u5e76\u4e0d\u63d0\u4ea4<\/p>\n<pre class=\"wp-code-highlight prettyprint\">\r\nSQL&gt; select sid from v$mystat where rownum&lt;2;\r\n\r\n       SID\r\n----------\r\n       159\r\n\r\nSQL&gt; delete from emp where EMPNO=7369;\r\n\r\n1 row deleted.\r\n<\/pre>\n<p>\u6d4b\u8bd5\u4f1a\u8bdd2\u5220\u9664\u7236\u8868\u4e00\u6761\u672a\u7ea7\u8054\u5b50\u8868\u7684\u8bb0\u5f55\u662f\u5426\u6210\u529f<\/p>\n<pre class=\"wp-code-highlight prettyprint\">\r\nSQL&gt; select sid from v$mystat where rownum&lt;2;\r\n\r\n       SID\r\n----------\r\n       149\r\n\r\nSQL&gt; delete from dept where DEPTNO=40;\r\n<\/pre>\n<p>\u6ce8\u610f\uff1a\u6b64\u65f6\u4f1a\u8bdd2\u7b49\u5f85<\/p>\n<p>\u7528\u7b2c\u4e09\u4e2a\u4f1a\u8bdd\u67e5\u770b\u7528\u6237\u7b49\u5f85\u4e8b\u4ef6<\/p>\n<pre class=\"wp-code-highlight prettyprint\">\r\nSQL&gt; select sid from v$mystat where rownum&lt;2;\r\n\r\n       SID\r\n----------\r\n       138\r\nSQL&gt;    col event form A50 \r\nSQL&gt;    col Prev form 99999 \r\nSQL&gt;    col Curr form 99999 \r\nSQL&gt;    col Tot form 99999\r\nSQL&gt;    set linesize 140 \r\nSQL&gt;    select inst_id,event,sum(decode(wait_Time,0,0,1)) &quot;Prev&quot;, sum(decode(wait_Time,0,1,0)) &quot;Curr&quot;,count(*) &quot;Tot&quot; \r\n  2     from gv$session_Wait group by inst_id,event order by 5\r\n  3  ;\r\n\r\n   INST_ID EVENT                                                Prev   Curr    Tot\r\n---------- -------------------------------------------------- ------ ------ ------\r\n         1 Streams AQ: waiting for time management or cleanup      0      1      1\r\n            tasks\r\n\r\n         1 enq: TM - contention                                    0      1      1\r\n         1 smon timer                                              0      1      1\r\n         1 Streams AQ: qmn slave idle wait                         0      1      1\r\n         1 SQL*Net message from client                             0      1      1\r\n         1 pmon timer                                              0      1      1\r\n         1 Streams AQ: qmn coordinator idle wait                   0      1      1\r\n         1 jobq slave wait                                         0      1      1\r\n         1 SQL*Net message to client                               1      0      1\r\n\r\n   INST_ID EVENT                                                Prev   Curr    Tot\r\n---------- -------------------------------------------------- ------ ------ ------\r\n         1 rdbms ipc message                                       0     11     11\r\n\r\n10 rows selected.\r\n\r\nSQL&gt; select SID,SERIAL#,SQL_ID,BLOCKING_SESSION,EVENT from v$session;\r\n\r\n       SID    SERIAL# SQL_ID        BLOCKING_SESSION EVENT\r\n---------- ---------- ------------- ---------------- --------------------------------------------------\r\n       138         40 br360w88pbxdf                  SQL*Net message to client\r\n       139         34                                Streams AQ: qmn slave idle wait\r\n       148          1 4gd6b1r53yt88                  Streams AQ: waiting for time management or cleanup\r\n                                                      tasks\r\n\r\n       149        110 adayn6h80by5s              159 enq: TM - contention\r\n       151          1                                Streams AQ: qmn coordinator idle wait\r\n       155          1                                rdbms ipc message\r\n       156          1                                rdbms ipc message\r\n       158        163                                jobq slave wait\r\n       159         17                                SQL*Net message from client\r\n\r\n       SID    SERIAL# SQL_ID        BLOCKING_SESSION EVENT\r\n---------- ---------- ------------- ---------------- --------------------------------------------------\r\n       160          1 4gd6b1r53yt88                  rdbms ipc message\r\n       161          1                                rdbms ipc message\r\n       162          1                                rdbms ipc message\r\n       163          1                                rdbms ipc message\r\n       164          1                                rdbms ipc message\r\n       165          1                                smon timer\r\n       166          1                                rdbms ipc message\r\n       167          1                                rdbms ipc message\r\n       168          1                                rdbms ipc message\r\n       169          1                                rdbms ipc message\r\n       170          1                                pmon timer\r\n\r\n20 rows selected.\r\n\r\n<\/pre>\n<p>\u6b64\u5904\u53d1\u73b0\u4f1a\u8bdd159\u963b\u585e\u4e86149.<br \/>\n\u5c06159\u5373\u5c31\u662f\u4f1a\u8bdd1\u7684\u4e8b\u52a1\u7ed3\u675f\u540e\uff0c\u4f1a\u8bdd149\u5373\u5c31\u662f\u4f1a\u8bdd2\u4f1a\u5373\u65f6\u6267\u884c\u3002<\/p>\n<p>\u6d4b\u8bd53\uff1a\u5b50\u8868\u5b58\u5728\u672a\u51b3\u4e8b\u52a1\uff0c\u5bf9\u7236\u8868\u8fdb\u884c\u4fee\u6539\u64cd\u4f5c<br \/>\n\u4f1a\u8bdd1\u5220\u9664\u5b50\u8868\u4e00\u6761\u8bb0\u5f55\uff0c\u5e76\u4e0d\u63d0\u4ea4<\/p>\n<pre class=\"wp-code-highlight prettyprint\">\r\nSQL&gt; select sid from v$mystat where rownum&lt;2;\r\n\r\n       SID\r\n----------\r\n       159\r\n\r\nSQL&gt; delete from emp where EMPNO=7369;\r\n\r\n1 row deleted.\r\n<\/pre>\n<p>\u6d4b\u8bd5\u4f1a\u8bdd2\u4fee\u6539\u7236\u8868\u4e00\u6761\u672a\u7ea7\u8054\u5b50\u8868\u7684\u8bb0\u5f55\u662f\u5426\u6210\u529f<\/p>\n<pre class=\"wp-code-highlight prettyprint\">\r\nSQL&gt; select sid from v$mystat where rownum&lt;2;\r\n\r\n       SID\r\n----------\r\n       149\r\n\r\nSQL&gt; update dept set DEPTNO=50 where DEPTNO=40;\r\n<\/pre>\n<p>\u6ce8\u610f\uff1a\u6b64\u65f6\u4f1a\u8bdd2\u7b49\u5f85<\/p>\n<p>\u7528\u7b2c\u4e09\u4e2a\u4f1a\u8bdd\u67e5\u770b\u7528\u6237\u7b49\u5f85\u4e8b\u4ef6<\/p>\n<pre class=\"wp-code-highlight prettyprint\">\r\nSQL&gt; select sid from v$mystat where rownum&lt;2;\r\n\r\n       SID\r\n----------\r\n       138\r\n\r\nSQL&gt; select SID,SERIAL#,SQL_ID,BLOCKING_SESSION,EVENT from v$session;\r\n\r\n       SID    SERIAL# SQL_ID        BLOCKING_SESSION EVENT\r\n---------- ---------- ------------- ---------------- --------------------------------------------------\r\n       138         40 br360w88pbxdf                  SQL*Net message to client\r\n       139         34                                Streams AQ: qmn slave idle wait\r\n       148          1 4gd6b1r53yt88                  Streams AQ: waiting for time management or cleanup\r\n                                                      tasks\r\n\r\n       149        110 640jbq09zkk8s              159 enq: TM - contention\r\n       151          1                                Streams AQ: qmn coordinator idle wait\r\n       155          1                                rdbms ipc message\r\n       156          1                                rdbms ipc message\r\n       158        179                                jobq slave wait\r\n       159         17                                SQL*Net message from client\r\n\r\n       SID    SERIAL# SQL_ID        BLOCKING_SESSION EVENT\r\n---------- ---------- ------------- ---------------- --------------------------------------------------\r\n       160          1 4gd6b1r53yt88                  rdbms ipc message\r\n       161          1                                rdbms ipc message\r\n       162          1                                rdbms ipc message\r\n       163          1                                rdbms ipc message\r\n       164          1                                rdbms ipc message\r\n       165          1                                smon timer\r\n       166          1                                rdbms ipc message\r\n       167          1                                rdbms ipc message\r\n       168          1                                rdbms ipc message\r\n       169          1                                rdbms ipc message\r\n       170          1                                pmon timer\r\n\r\n20 rows selected.\r\n<\/pre>\n<p>\u6b64\u5904\u53d1\u73b0\u4f1a\u8bdd159\u963b\u585e\u4e86149.<br \/>\n\u540c\u6837\u5c06159\u5373\u5c31\u662f\u4f1a\u8bdd1\u7684\u4e8b\u52a1\u7ed3\u675f\u540e\uff0c\u4f1a\u8bdd149\u5373\u5c31\u662f\u4f1a\u8bdd2\u4f1a\u5373\u65f6\u6267\u884c\u3002<\/p>\n<p>\u4ee5\u4e0b\u4e3a\u5728\u5b50\u8868\u7684\u5916\u952e\u4e0a\u521b\u5efa\u7d22\u5f15\u7684\u6d4b\u8bd5<br \/>\n<strong>\u9996\u5148\u521b\u5efaB\u6811\u7d22\u5f15\u8fdb\u884c\u6d4b\u8bd5<\/strong><\/p>\n<pre class=\"wp-code-highlight prettyprint\">\r\nSQL&gt; create index idx_emp on emp(DEPTNO);\r\n\r\nIndex created.\r\n<\/pre>\n<p>\u5728\u5bf9\u5b50\u8868\u7684\u5916\u952e\u5217\u4e0a\u521b\u5efaB\u6811\u7d22\u5f15\u540e\uff0c\u5e76\u8fdb\u884c\u4ee5\u4e0a\u6d4b\u8bd5\uff0c\u53d1\u73b0\u5b50\u8868\u5b58\u5728\u672a\u51b3\u4e8b\u52a1\u65f6\uff0c\u4e3b\u8868\u7684\u589e\u5220\u6539\u4e0d\u4f1a\u53d7\u5230\u5f71\u54cd\u3002<\/p>\n<p><strong>\u5176\u6b21\u521b\u5efa\u4f4d\u56fe\u7d22\u5f15\u8fdb\u884c\u6d4b\u8bd5<\/strong><\/p>\n<pre class=\"wp-code-highlight prettyprint\">\r\nSQL&gt; drop index idx_emp;\r\n\r\nIndex dropped.\r\n\r\nSQL&gt; create bitmap index idx_bit_emp on emp(DEPTNO);\r\n\r\nIndex created.\r\n\r\nSQL&gt; delete from emp where EMPNO=7369;\r\n\r\n1 row deleted.\r\n<\/pre>\n<p>\u5728\u5bf9\u5b50\u8868\u7684\u5916\u952e\u5217\u4e0a\u521b\u5efa\u4f4d\u56fe\u7d22\u5f15\u540e\uff0c\u5e76\u8fdb\u884c\u4ee5\u4e0a\u6d4b\u8bd5\uff0c\u53d1\u73b0\u5b50\u8868\u5b58\u5728\u672a\u51b3\u4e8b\u52a1\u65f6\uff0c\u4e3b\u8868\u7684\u589e\u5220\u6539\u53d7\u5230\u7684\u5f71\u54cd\u548c\u672a\u52a0\u7d22\u5f15\u4e00\u81f4\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5916\u952e\u7f3a\u5931\u7d22\u5f15\u5bfc\u81f4\u9501\u8868\u7684\u95ee\u9898 \u4e00\u822c\u5efa\u8bae\u5728\u5916\u952e\u4e0a\u6dfb\u52a0B\u6811\u7d22\u5f15\uff0c\u5982\u679c\u6ca1\u6709B\u6811\u7d22\u5f15\uff0c\u90a3\u4e48\u53ef\u80fd\u5728\u5bf9\u5b50\u8868\u64cd\u4f5c\u65f6\uff0c\u9020\u6210\u4e3b\u8868\u9501 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[87,36],"tags":[138,137],"_links":{"self":[{"href":"http:\/\/www.yallonking.com\/index.php?rest_route=\/wp\/v2\/posts\/739"}],"collection":[{"href":"http:\/\/www.yallonking.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.yallonking.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.yallonking.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.yallonking.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=739"}],"version-history":[{"count":4,"href":"http:\/\/www.yallonking.com\/index.php?rest_route=\/wp\/v2\/posts\/739\/revisions"}],"predecessor-version":[{"id":743,"href":"http:\/\/www.yallonking.com\/index.php?rest_route=\/wp\/v2\/posts\/739\/revisions\/743"}],"wp:attachment":[{"href":"http:\/\/www.yallonking.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=739"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yallonking.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=739"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yallonking.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=739"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}