{"id":568,"date":"2012-02-14T23:59:47","date_gmt":"2012-02-14T15:59:47","guid":{"rendered":"https:\/\/yangtingkun.net\/?p=568"},"modified":"2012-02-16T10:01:30","modified_gmt":"2012-02-16T02:01:30","slug":"%e8%af%ad%e5%8f%a5%e7%ba%a7%e5%b9%b6%e8%a1%8c%e6%8f%90%e7%a4%ba","status":"publish","type":"post","link":"https:\/\/yangtingkun.net\/?p=568","title":{"rendered":"\u8bed\u53e5\u7ea7\u5e76\u884c\u63d0\u793a"},"content":{"rendered":"<p>\u6700\u8fd1\u624d\u53d1\u73b0\u5e76\u884c\u63d0\u793a\u589e\u52a0\u4e86\u8bed\u53e5\u7ea7\u5e76\u884c\u7684\u529f\u80fd\u3002<br \/>\n\u4ee5\u524d\u6dfb\u52a0\u5e76\u884c\u90fd\u662f\u5bf9\u6307\u5b9a\u7684\u8868\u6dfb\u52a0\uff0c\u6700\u8fd1\u624d\u53d1\u73b0\uff0c\u5982\u679c\u4e0d\u52a0\u8868\u540d\uff0c\u662f\u6307\u5b9a\u8fd9\u4e2a\u8bed\u53e5\u7684\u5e76\u884c\u5ea6\uff1a<\/p>\n<pre lang='SQL'>SQL> create table t_p_i as \r\n  2  select * \r\n  3  from dba_objects \r\n  4  where 1 = 2;\r\nTable created.\r\nSQL> create table t_p_s as\r\n  2  select * \r\n  3  from dba_objects;\r\nTable created.\r\nSQL> set autot on exp  \r\nSQL> insert into t_p_i\r\n  2  select * \r\n  3  from t_p_s;\r\n13593 rows created.\r\nExecution Plan\r\n----------------------------------------------------------\r\nPlan hash value: 3463104165\r\n----------------------------------------------------------------------------------\r\n| Id  | Operation                | Name  | Rows  | Bytes | Cost (%CPU)| Time     |\r\n----------------------------------------------------------------------------------\r\n|   0 | INSERT STATEMENT         |       | 14768 |  2985K|    53   (0)| 00:00:01 |\r\n|   1 |  LOAD TABLE CONVENTIONAL | T_P_I |       |       |            |          |\r\n|   2 |   TABLE ACCESS FULL      | T_P_S | 14768 |  2985K|    53   (0)| 00:00:01 |\r\n----------------------------------------------------------------------------------\r\nNote\r\n-----\r\n   - dynamic sampling used for this statement (level=2)\r\nSQL> insert into t_p_i\r\n  2  select \/*+ parallel(t_p_s 4) *\/ * \r\n  3  from t_p_s;\r\n13593 rows created.\r\nExecution Plan\r\n----------------------------------------------------------\r\nPlan hash value: 455351089\r\n----------------------------------------------------------------------------------------\r\n|Id|Operation               |Name    |Rows |Bytes |Cost (%CPU)|   TQ |IN-OUT|PQ Distrib|\r\n----------------------------------------------------------------------------------------\r\n| 0|INSERT STATEMENT        |        |14768| 2985K|   15   (0)|      |      |          |\r\n| 1| LOAD TABLE CONVENTIONAL|T_P_I   |     |      |           |      |      |          |\r\n| 2|  PX COORDINATOR        |        |     |      |           |      |      |          |\r\n| 3|   PX SEND QC (RANDOM)  |:TQ10000|14768| 2985K|   15   (0)| Q1,00| P->S |QC (RAND) |\r\n| 4|    PX BLOCK ITERATOR   |        |14768| 2985K|   15   (0)| Q1,00| PCWC |          |\r\n| 5|     TABLE ACCESS FULL  |T_P_S   |14768| 2985K|   15   (0)| Q1,00| PCWP |          |\r\n----------------------------------------------------------------------------------------\r\nNote\r\n-----\r\n   - dynamic sampling used for this statement (level=2)\r\nSQL> insert \/*+ parallel(t_p_s 4) *\/ into t_p_i\r\n  2  select * \r\n  3  from t_p_s;\r\n13593 rows created.\r\nExecution Plan\r\n----------------------------------------------------------\r\nPlan hash value: 3463104165\r\n----------------------------------------------------------------------------------\r\n| Id  | Operation                | Name  | Rows  | Bytes | Cost (%CPU)| Time     |\r\n----------------------------------------------------------------------------------\r\n|   0 | INSERT STATEMENT         |       | 14768 |  2985K|    53   (0)| 00:00:01 |\r\n|   1 |  LOAD TABLE CONVENTIONAL | T_P_I |       |       |            |          |\r\n|   2 |   TABLE ACCESS FULL      | T_P_S | 14768 |  2985K|    53   (0)| 00:00:01 |\r\n----------------------------------------------------------------------------------\r\nNote\r\n-----\r\n   - dynamic sampling used for this statement (level=2)\r\nSQL> commit;\r\nCommit complete.\r\nSQL> alter session enable parallel dml;\r\nSession altered.\r\nSQL> set autot off\r\nSQL> explain plan for\r\n  2  insert \/*+ parallel(t_p_i 4) *\/ into t_p_i\r\n  3  select * \r\n  4  from t_p_s;\r\nExplained.\r\nSQL> select * from table(dbms_xplan.display);\r\nPLAN_TABLE_OUTPUT\r\n-----------------------------------------------------------------------------------------\r\nPlan hash value: 2807692233\r\n---------------------------------------------------------------------------------------\r\n|Id|Operation               |Name    |Rows |Bytes |Cost (%CPU)|  TQ |IN-OUT|PQ Distrib|\r\n--------------------------------------------------------------------------------------\r\n| 0|INSERT STATEMENT        |        |14768| 2985K|   53   (0)|     |      |          |\r\n| 1| PX COORDINATOR         |        |     |      |           |     |      |          |\r\n| 2|  PX SEND QC (RANDOM)   |:TQ10001|14768| 2985K|   53   (0)|Q1,01| P->S |QC (RAND) |\r\n| 3|   LOAD AS SELECT       |T_P_I   |     |      |           |Q1,01| PCWP |          |\r\n| 4|    PX RECEIVE          |        |14768| 2985K|   53   (0)|Q1,01| PCWP |          |\r\n| 5|     PX SEND ROUND-ROBIN|:TQ10000|14768| 2985K|   53   (0)|     | S->P |RND-ROBIN |\r\n| 6|      TABLE ACCESS FULL |T_P_S   |14768| 2985K|   53   (0)|     |      |          |\r\n---------------------------------------------------------------------------------------\r\nNote\r\n-----\r\n   - dynamic sampling used for this statement (level=2)\r\n17 rows selected.\r\nSQL> explain plan for\r\n  2  insert \/*+ parallel(t_p_i 4) *\/ into t_p_i\r\n  3  select \/*+ parallel(t_p_s 4) *\/ * \r\n  4  from t_p_s;\r\nExplained.\r\nSQL> select * from table(dbms_xplan.display);\r\nPLAN_TABLE_OUTPUT\r\n--------------------------------------------------------------------------------------\r\nPlan hash value: 2808998595\r\n-------------------------------------------------------------------------------------\r\n|Id|Operation             |Name    |Rows |Bytes |Cost (%CPU)|  TQ |IN-OUT|PQ Distrib|\r\n------------------------------------------------------------------------------------\r\n| 0|INSERT STATEMENT      |        |14768| 2985K|   15   (0)|     |      |          |\r\n| 1| PX COORDINATOR       |        |     |      |           |     |      |          |\r\n| 2|  PX SEND QC (RANDOM) |:TQ10000|14768| 2985K|   15   (0)|Q1,00| P->S |QC (RAND) |\r\n| 3|   LOAD AS SELECT     |T_P_I   |     |      |           |Q1,00| PCWP |          |\r\n| 4|    PX BLOCK ITERATOR |        |14768| 2985K|   15   (0)|Q1,00| PCWC |          |\r\n| 5|     TABLE ACCESS FULL|T_P_S   |14768| 2985K|   15   (0)|Q1,00| PCWP |          |\r\n-------------------------------------------------------------------------------------\r\nNote\r\n-----\r\n   - dynamic sampling used for this statement (level=2)\r\n16 rows selected.\r\nSQL> explain plan for\r\n  2  insert \/*+ parallel(4) *\/ into t_p_i\r\n  3  select * \r\n  4  from t_p_s;\r\nExplained.\r\nSQL> select * from table(dbms_xplan.display);\r\nPLAN_TABLE_OUTPUT\r\n---------------------------------------------------------------------------------------\r\nPlan hash value: 2808998595\r\n-------------------------------------------------------------------------------------\r\n|Id|Operation             |Name    |Rows |Bytes |Cost (%CPU)|  TQ |IN-OUT|PQ Distrib|\r\n-------------------------------------------------------------------------------------\r\n| 0|INSERT STATEMENT      |        |14768| 2985K|   15   (0)|     |      |          |\r\n| 1| PX COORDINATOR       |        |     |      |           |     |      |          |\r\n| 2|  PX SEND QC (RANDOM) |:TQ10000|14768| 2985K|   15   (0)|Q1,00| P->S |QC (RAND) |\r\n| 3|   LOAD AS SELECT     |T_P_I   |     |      |           |Q1,00| PCWP |          |\r\n| 4|    PX BLOCK ITERATOR |        |14768| 2985K|   15   (0)|Q1,00| PCWC |          |\r\n| 5|     TABLE ACCESS FULL|T_P_S   |14768| 2985K|   15   (0)|Q1,00| PCWP |          |\r\n-------------------------------------------------------------------------------------\r\nNote\r\n-----\r\n   - dynamic sampling used for this statement (level=2)\r\n   - Degree of Parallelism is 4 because of hint\r\n17 rows selected.<\/pre>\n<p>\u4ece\u8fd9\u4e2a\u5c0f\u4f8b\u5b50\u53ef\u4ee5\u770b\u5230\uff0c\u5982\u679c\u6307\u5b9a\u8868\u7ea7\u7684\u5e76\u884c\uff0c\u90a3\u4e48\u5fc5\u987b\u5728\u8bbf\u95ee\u8868\u7684\u8bed\u53e5\u4e2d\uff0c\u6bd4\u5982\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u5982\u679c\u5bf9\u67e5\u8be2\u7684\u8868\u6307\u5b9a\u5e76\u884c\uff0c\u5c06\u5e76\u884c\u7684HINT\u653e\u5230INSERT\u8bed\u53e5\u4e2d\u662f\u6ca1\u6709\u6548\u679c\u7684\u3002<br \/>\n\u800c\u5982\u679c\u60f3\u8981INSERT\u548cSELECT\u540c\u65f6\u5e76\u884c\u6267\u884c\uff0c\u90a3\u4e48\u5fc5\u987b\u5728INSERT\u548cSELECT\u8bed\u53e5\u4e2d\u5206\u522b\u6307\u5b9a\u67e5\u8be2\u548c\u63d2\u5165\u8868\u7684\u5e76\u884c\u5ea6\u3002\u5982\u679c\u5b58\u5728\u591a\u4e2a\u8868\u7684\u8fde\u63a5\uff0c\u5e76\u884c\u8bbe\u7f6e\u8fd8\u4f1a\u66f4\u9ebb\u70e6\u3002<br \/>\n\u800c\u901a\u8fc7\u8bed\u53e5\u7ea7\u7684\u5e76\u884c\u8bbe\u7f6e\u5f88\u597d\u7684\u89e3\u51b3\u4e86\u8fd9\u4e2a\u95ee\u9898\uff0c\u901a\u8fc7\u5728\u7b2c\u4e00\u4e2a\u547d\u4ee4\u540e\u6dfb\u52a0\u4e0d\u5e26\u8868\u540d\u7684\u5e76\u884c\u63d0\u793a\uff0c\u4f7f\u5f97\u8fd9\u4e2a\u8bed\u53e5\u4e2d\u6240\u6709\u7684\u5b50\u53e5\u90fd\u4f1a\u4f7f\u7528\u5e76\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6700\u8fd1\u624d\u53d1\u73b0\u5e76\u884c\u63d0\u793a\u589e\u52a0\u4e86\u8bed\u53e5\u7ea7\u5e76\u884c\u7684\u529f\u80fd\u3002 \u4ee5\u524d\u6dfb\u52a0\u5e76\u884c\u90fd\u662f\u5bf9\u6307\u5b9a\u7684\u8868\u6dfb\u52a0\uff0c\u6700\u8fd1\u624d\u53d1\u73b0\uff0c\u5982\u679c\u4e0d\u52a0\u8868\u540d\uff0c\u662f\u6307\u5b9a\u8fd9\u4e2a\u8bed\u53e5\u7684\u5e76\u884c\u5ea6\uff1a SQL> create table t_p_i as 2 select * 3 from dba_objects 4 where 1 = 2; Table created. SQL> create table t_p_s as 2 select * 3 from dba_objects; Table created. SQL> set autot on exp SQL> insert &hellip; <a href=\"https:\/\/yangtingkun.net\/?p=568\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3],"tags":[458,459],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2yiY3-9a","_links":{"self":[{"href":"https:\/\/yangtingkun.net\/index.php?rest_route=\/wp\/v2\/posts\/568"}],"collection":[{"href":"https:\/\/yangtingkun.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yangtingkun.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=568"}],"version-history":[{"count":1,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=\/wp\/v2\/posts\/568\/revisions"}],"predecessor-version":[{"id":570,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=\/wp\/v2\/posts\/568\/revisions\/570"}],"wp:attachment":[{"href":"https:\/\/yangtingkun.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=568"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=568"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=568"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}