{"id":1481,"date":"2016-07-06T22:31:09","date_gmt":"2016-07-06T14:31:09","guid":{"rendered":"https:\/\/yangtingkun.net\/?p=1481"},"modified":"2016-07-06T22:39:00","modified_gmt":"2016-07-06T14:39:00","slug":"%e9%9d%9e%e7%a9%ba%e5%ad%97%e6%ae%b5%e7%a9%ba%e5%80%bc%e5%af%b9%e6%9f%a5%e8%af%a2%e7%9a%84%e5%bd%b1%e5%93%8d","status":"publish","type":"post","link":"https:\/\/yangtingkun.net\/?p=1481","title":{"rendered":"\u975e\u7a7a\u5b57\u6bb5\u7a7a\u503c\u5bf9\u67e5\u8be2\u7684\u5f71\u54cd"},"content":{"rendered":"<p>BLOG\u6709\u4e09\u5e74\u6ca1\u6709\u66f4\u65b0\u4e86\uff0c\u5176\u5b9e\u8fd9\u7bc7\u6587\u6863\u4e5f\u662f\u4e09\u5e74\u524d\u5199\u7684\uff0c\u4e0d\u8fc7\u5f53\u65f6\u6ca1\u6709\u8d34\u51fa\u6765\uff0c\u4eca\u5929\u770b\u5230\u6709\u4eba\u95ee\u8d77\uff0c\u4e8e\u662f\u5206\u4eab\u51fa\u6765\u3002<\/p>\n<p>\u8fd9\u662f\u5ba2\u6237\u6570\u636e\u5e93\u4e2d\u78b0\u5230\u7684\u4e00\u4e2a\u6709\u610f\u601d\u7684\u95ee\u9898\u3002<br \/>\n\u6570\u636e\u5e93\u7248\u672c\u4e3a11.2.0.3\uff0c\u5ba2\u6237\u7684DSG\u540c\u6b65\u8f6f\u4ef6\u5728\u540c\u6b65\u67d0\u5f20\u8868\u65f6\u51fa\u73b0\u4e86\u9519\u8bef\uff0c\u62a5\u9519\u65e0\u975e\u63d2\u5165\u7a7a\u503cORA-1400\uff0c\u672c\u6765\u8fd9\u662f\u4e00\u4e2a\u5f88\u7b80\u5355\u7684\u95ee\u9898\uff0c\u4f46\u662f\u8bca\u65ad\u53d1\u73b0\u95ee\u9898\u6bd4\u8f83\u6709\u610f\u601d\uff1a<br \/>\n<code>SQL> select * from t_def;<br \/>\n        ID NAME                           TYPE<br \/>\n---------- ------------------------------ --------<br \/>\n         1 a<br \/>\nSQL> select * from t_def where type is null;<br \/>\nno rows selected<br \/>\nSQL> select * from t_def where type is not null;<br \/>\n        ID NAME                           TYPE<br \/>\n---------- ------------------------------ --------<br \/>\n         1 a<br \/>\nSQL> select dump(type) from t_def;<br \/>\nDUMP(TYPE)<br \/>\n--------------------------------------------<br \/>\nNULL<br \/>\nSQL> select nvl(type, 'is null') from t_def;<br \/>\nNVL(TYPE<br \/>\n--------<br \/>\nis null<\/code><br \/>\n\u7b2c\u4e00\u4e2a\u67e5\u8be2\u4e0d\u80fd\u53cd\u6620\u4efb\u4f55\u95ee\u9898\uff0c\u800c\u7b2c\u4e8c\u4e2a\u67e5\u8be2\u548c\u7b2c\u4e09\u4e2a\u67e5\u8be2\u660e\u786e\u7684\u544a\u8bc9\u6211\u4eec\uff0cTYPE\u5217\u7684\u503c\u4e0d\u662fNULL\u3002\u4f46\u662f\u7b2c\u56db\u4e2a\u67e5\u8be2\u548c\u7b2c\u4e94\u4e2a\u67e5\u8be2\u53c8\u786e\u5b9a\u544a\u4e4b\u6211\u4eec\uff0cTYPE\u5217\u662fNULL\u3002\u5230\u5e95TYPE\u5217\u7684\u503c\u662fNULL\u8fd8\u662fNOT NULL\u5462\uff0c\u8fd9\u662f\u4e00\u4e2a\u95ee\u9898\u3002<br \/>\nOracle\u7ed9\u4e86\u6211\u4eec\u4e24\u4e2a\u4e0d\u540c\u7684\u7b54\u6848\uff0c\u4f46\u662f\u53ef\u4ee5\u575a\u4fe1\u7684\u662f\uff0c\u4e00\u6761\u8bb0\u5f55\u7684\u5b57\u6bb5\u4e0d\u53ef\u80fd\u540c\u65f6\u5177\u6709\u8fd9\u4e24\u79cd\u5c5e\u6027\uff0c\u8981\u4e0d\u7136\u662fNULL\u503c\uff0c\u8981\u4e0d\u7136\u5c31\u662fNOT NULL\uff0c\u5b83\u4e0d\u53ef\u80fd\u65e2\u662fNULL\u53c8\u662fNOT NULL\uff0c\u8fd9\u4e0d\u79d1\u5b66\u3002\u4ec0\u4e48\uff1f\u859b\u5b9a\u8c14\u7684\u732b\uff1f\u8c01\u8bf4\u7684\uff1f\u6211\u7684\u5200\u5462\uff1f\uff01<br \/>\n\u7535\u5b50\u7684\u6ce2\u7c92\u4e8c\u8c61\u6027\u95ee\u9898\u672c\u8d28\u662f\u6ce2\u52a8\u548c\u7c92\u5b50\u6027\u4e0d\u60f3\u4eba\u4eec\u4e00\u5f00\u59cb\u8ba4\u4e3a\u7684\u90a3\u6837\u662f\u5b8c\u5168\u5bf9\u7acb\u7684\uff0c\u4e8b\u5b9e\u4e0a\u5728\u7535\u5b50\u7684\u5c3a\u5ea6\u4e0a\uff0c\u672c\u8eab\u4e8c\u8005\u5c31\u662f\u5171\u5b58\u7684\uff0c\u6240\u4ee5\u4f60\u7528\u68c0\u67e5\u6ce2\u52a8\u7684\u65b9\u6cd5\u53bb\u89c2\u5bdf\u7535\u5b50\uff0c\u7535\u5b50\u5c31\u4ee5\u6ce2\u7684\u5f62\u5f0f\u51fa\u73b0\uff0c\u800c\u4ee5\u7c92\u5b50\u65b9\u5f0f\u53bb\u89c2\u5bdf\u7535\u5b50\uff0c\u7535\u5b50\u5c31\u4ee5\u7c92\u5b50\u7684\u65b9\u5f0f\u5448\u73b0\u3002\u56e0\u6b64\uff0c\u6ce2\u7c92\u4e8c\u8c61\u6027\u672c\u8d28\u5e76\u4e0d\u662f\u5bf9\u7acb\u7684\u3002<br \/>\n\u859b\u5b9a\u8c14\u7684\u732b\u7684\u672c\u8d28\u4e5f\u662f\u76f8\u540c\u7684\uff0c\u5f53\u7136\u8fd8\u8981\u6d89\u53ca\u5230\u610f\u8bc6\u3001\u89c2\u6d4b\u3001\u574d\u584c\u7b49\u4e00\u7cfb\u5217\u590d\u6742\u7684\u95ee\u9898\u3002\u5efa\u8bae\u4e0d\u4e86\u89e3\u91cf\u5b50\u529b\u5b66\u7684\u540c\u5b66\u4eec\u76f4\u63a5\u8df3\u8fc7\u4ee5\u4e0a\u4e24\u6bb5\u5185\u5bb9\u3002\u800c\u5982\u679c\u4f60\u5bf9\u91cf\u5b50\u529b\u5b66\u6709\u6240\u7814\u7a76\uff0c\u4f60\u5c31\u77e5\u9053\u6211\u5b8c\u5168\u662f\u505a\u4e3a\u4e00\u4e2a\u95e8\u5916\u6c49\u5728\u80e1\u626f\uff0c\u8bf7\u65e0\u89c6\u4e0a\u9762\u4e24\u6bb5\u5185\u5bb9\u3002<br \/>\n\u597d\u4e86\uff0c\u626f\u6de1\u5b8c\u6bd5\uff0c\u56de\u5230Oracle\u7684\u95ee\u9898\u4e0a\uff0c\u6211\u4e2a\u4eba\u4e0d\u76f8\u4fe1\u91cf\u5b50\u5c3a\u5ea6\u4e0a\u7684\u4e0d\u786e\u5b9a\u6027\u4f1a\u5f71\u54cd\u5230Oracle\u7684\u67e5\u8be2\u7ed3\u679c\uff0c\u56e0\u6b64\u6211\u4eec\u9700\u8981\u627e\u5230\u95ee\u9898\u51fa\u5728\u54ea\u91cc\u3002<br \/>\n\u7b80\u5355\u5206\u6790\u4e00\u4e0b\uff0c\u901a\u8fc7WHERE\u6761\u4ef6\u5224\u65ad\u5f97\u5230\u7684\u5b57\u6bb5\u7a7a\u503c\u4e0e\u5426\u4e0e\u901a\u8fc7\u51fd\u6570\u5f97\u5230\u7684\u7ed3\u679c\u662f\u76f8\u53cd\u7684\u3002\u5728\u5b8f\u89c2\u7684\u7ef4\u5ea6\u4e0a\u770b\uff0c\u90a3\u4e48\u603b\u6709\u4e00\u4e2a\u7ed3\u679c\u662f\u9519\u8bef\u7684\u3002\u65e2\u7136Oracle\u672c\u8eab\u5df2\u7ecf\u4e0d\u53ef\u4fe1\u4e86\uff0c\u90a3\u4e48\u6211\u4eec\u6765\u770b\u770b\u6570\u636e\u672c\u8eab\u5230\u5e95\u662f\u5982\u4f55\u7684\u3002<br \/>\n<code>SQL> select dbms_rowid.rowid_relative_fno(rowid), dbms_rowid.rowid_block_number(rowid) from t_def;<br \/>\nDBMS_ROWID.ROWID_RELATIVE_FNO(ROWID) DBMS_ROWID.ROWID_BLOCK_NUMBER(ROWID)<br \/>\n------------------------------------ ------------------------------------<br \/>\n                                   4                               173109<br \/>\nSQL> alter system dump datafile 4 block 173109;<br \/>\nSystem altered.<\/code><br \/>\n\u4e0b\u9762\u770b\u4e00\u4e0b\u6570\u636e\u5757\u4e2d\u7684\u5185\u5bb9\uff1a<br \/>\n<code>Block header dump:  0x0102a435<br \/>\n Object id on Block? Y<br \/>\n seg\/obj: 0x145df  csc: 0x00.23b6097  itc: 2  flg: E  typ: 1 - DATA<br \/>\n     brn: 0  bdba: 0x102a430 ver: 0x01 opc: 0<br \/>\n     inc: 0  exflg: 0<br \/>\n Itl           Xid                  Uba         Flag  Lck        Scn\/Fsc<br \/>\n0x01   0x0008.01b.00001afc  0x00c026de.11be.10  --U-    1  fsc 0x0000.023b6098<br \/>\n0x02   0x0000.000.00000000  0x00000000.0000.00  ----    0  fsc 0x0000.00000000<br \/>\nbdba: 0x0102a435<br \/>\ndata_block_dump,data header at 0x7fe7fdc97264<br \/>\n===============<br \/>\ntsiz: 0x1f98<br \/>\nhsiz: 0x14<br \/>\npbl: 0x7fe7fdc97264<br \/>\n     76543210<br \/>\nflag=--------<br \/>\nntab=1<br \/>\nnrow=1<br \/>\nfrre=-1<br \/>\nfsbo=0x14<br \/>\nfseo=0x1f90<br \/>\navsp=0x1f7b<br \/>\ntosp=0x1f7b<br \/>\n0xe:pti[0]      nrow=1  offs=0<br \/>\n0x12:pri[0]     offs=0x1f90<br \/>\nblock_row_dump:<br \/>\ntab 0, row 0, @0x1f90<br \/>\ntl: 8 fb: --H-FL-- lb: 0x1  cc: 2<br \/>\ncol  0: [ 2]  c1 02<br \/>\ncol  1: [ 1]  61<br \/>\nend_of_block_dump<br \/>\nEnd dump data blocks tsn: 4 file#: 4 minblk 173109 maxblk 173109<\/code><br \/>\n\u663e\u7136\uff0c\u6570\u636e\u5757\u4e2d\u53ea\u6709\u4e24\u4e2a\u5217\u7684\u503c\uff0c\u4e5f\u5c31\u662f\u771f\u5b9e\u7684\u60c5\u51b5\u662fTYPE\u5217\u662fNULL\u3002\u5728WHERE\u6761\u4ef6\u548c\u51fd\u6570\u7684PK\u4e2d\uff0c\u51fd\u6570\u53d6\u5f97\u4e86\u6700\u7ec8\u7684\u80dc\u5229\u3002<br \/>\n\u4f46\u662f\u5bf9\u6211\u4eec\u800c\u8a00\uff0c\u95ee\u9898\u624d\u521a\u521a\u5f00\u59cb\uff0c\u4e3a\u4ec0\u4e48\u660e\u660e\u662fNULL\u503c\uff0c\u4f46\u662f\u901a\u8fc7IS NULL\u548cIS NOT NULL\u7684\u67e5\u8be2\u6761\u4ef6\u8fdb\u884c\u8fc7\u6ee4\uff0c\u5f97\u5230\u7684\u662f\u4e0e\u771f\u5b9e\u6761\u4ef6\u76f8\u53cd\u7684\u7ed3\u679c\u3002<br \/>\nOracle\u7684\u6267\u884c\u8bed\u53e5\u4e0d\u4f1a\u8fd9\u4e48\u7b28\uff0c\u8fde\u6700\u57fa\u672c\u7684\u67e5\u8be2\u6761\u4ef6\u90fd\u5224\u65ad\u9519\u5427\u3002\u4e8b\u5b9e\u4e0a\uff0c\u5bfc\u81f4\u67e5\u8be2\u7ed3\u679c\u76f8\u5de6\u7684\u4e00\u4e2a\u539f\u56e0\u6070\u6070\u662fOracle\u7684CBO\u592a\u667a\u80fd\u4e86\uff0c\u6211\u4eec\u770b\u4e00\u4e0b\u8868\u7ed3\u6784\u548c\u6267\u884c\u8ba1\u5212\u5c31\u771f\u76f8\u5927\u767d\u4e86\uff1a<br \/>\n<code>SQL> select dbms_metadata.get_ddl('TABLE', 'T_DEF') from dual;<br \/>\nDBMS_METADATA.GET_DDL('TABLE','T_DEF')<br \/>\n--------------------------------------------------------------------------------<br \/>\n  CREATE TABLE \"TEST\".\"T_DEF\"<br \/>\n   (    \"ID\" NUMBER,<br \/>\n        \"NAME\" VARCHAR2(8) DEFAULT 'a',<br \/>\n        \"TYPE\" VARCHAR2(8) DEFAULT '' NOT NULL ENABLE<br \/>\n   ) SEGMENT CREATION IMMEDIATE<br \/>\n  PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255<br \/>\n NOCOMPRESS LOGGING<br \/>\n  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645<br \/>\n  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1<br \/>\n  BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)<br \/>\n  TABLESPACE \"USERS\"<br \/>\nSQL> set autot on exp<br \/>\nSQL> select * from t_def where type is null;<br \/>\nno rows selected<br \/>\nExecution Plan<br \/>\n----------------------------------------------------------<br \/>\nPlan hash value: 177263571<br \/>\n----------------------------------------------------------------------------<br \/>\n| Id  | Operation          | Name  | Rows  | Bytes | Cost (%CPU)| Time     |<br \/>\n----------------------------------------------------------------------------<br \/>\n|   0 | SELECT STATEMENT   |       |     1 |     5 |     0   (0)|          |<br \/>\n|*  1 |  FILTER            |       |       |       |            |          |<br \/>\n|   2 |   TABLE ACCESS FULL| T_DEF |     1 |     5 |     3   (0)| 00:00:01 |<br \/>\n----------------------------------------------------------------------------<br \/>\nPredicate Information (identified by operation id):,F<br \/>\n---------------------------------------------------<br \/>\n   1 - filter(NULL IS NOT NULL)<br \/>\nSQL> select * from t_def where type is not null;<br \/>\n        ID NAME     TYPE<br \/>\n---------- -------- --------<br \/>\n         1 a<br \/>\nExecution Plan<br \/>\n----------------------------------------------------------<br \/>\nPlan hash value: 1057129282<br \/>\n---------------------------------------------------------------------------<br \/>\n| Id  | Operation         | Name  | Rows  | Bytes | Cost (%CPU)| Time     |<br \/>\n---------------------------------------------------------------------------<br \/>\n|   0 | SELECT STATEMENT  |       |     1 |     5 |     3   (0)| 00:00:01 |<br \/>\n|   1 |  TABLE ACCESS FULL| T_DEF |     1 |     5 |     3   (0)| 00:00:01 |<br \/>\n---------------------------------------------------------------------------<\/code><br \/>\n\u73b0\u5728\u6211\u4eec\u53ef\u4ee5\u653e\u5fc3\u5927\u80c6\u7684\u5ba3\u5e03\uff0c\u8fd9\u4e2a\u95ee\u9898\u548c\u732b\u6ca1\u6709\u5173\u7cfb\u3002\u4ece\u8868\u7684\u5b9a\u4e49\u53ef\u4ee5\u770b\u5230\uff0cTYPE\u5217\u7684\u5c5e\u6027\u662fNOT NULL\u7684\uff0c\u800c\u76ee\u524d\u8bb0\u5f55\u4e2dTYPE\u7684\u503c\u662fNULL\uff0c\u8fd9\u5c31\u662f\u95ee\u9898\u7684\u5173\u952e\u3002<br \/>\n\u4ece10g\u5f00\u59cb\uff0cCBO\u53d8\u5f97\u66f4\u806a\u660e\uff0c\u4f46\u4e00\u4e2a\u67e5\u8be2\u6761\u4ef6\u660e\u663e\u7684\u8fdd\u53cd\u8868\u4e2d\u7684\u7ea6\u675f\u6761\u4ef6\u65f6\uff0cCBO\u4f1a\u5728\u6267\u884c\u8ba1\u5212\u7684\u6700\u4e0a\u5c42\u589e\u52a0\u4e00\u4e2aFILTER\uff0c\u800cFILTER\u7684\u6761\u4ef6\u662f\u6052\u4e3a\u5047\u7684\u6761\u4ef6NULL IS NOT NULL\uff0c\u5bfc\u81f4\u7684\u7ed3\u679c\u662fOracle\u6839\u672c\u4e0d\u9700\u8981\u771f\u6b63\u6267\u884c\u8fd9\u4e2a\u8bed\u53e5\uff0c\u5c31\u76f4\u63a5\u8fd4\u56de0\u6761\u8bb0\u5f55\uff0c\u56e0\u4e3a\u8868\u4e2d\u5b9a\u4e49\u7684\u9650\u5236\u6761\u4ef6\u662fTYPE\u975e\u7a7a\uff0cOracle\u5e76\u4e0d\u4f1a\u53bb\u6267\u884c\u8fd9\u4e2a\u67e5\u8be2\u8bed\u53e5\uff0c\u800c\u662f\u76f4\u63a5\u8fd4\u56de\u4e860\u6761\u8bb0\u5f55\u3002<br \/>\n\u800c\u5bf9\u4e8eTYPE IS NOT NULL\u7684\u67e5\u8be2\u800c\u8a00\uff0c\u7531\u4e8e\u67e5\u8be2\u6761\u4ef6\u6ee1\u8db3\u7ea6\u675f\u7684\u6761\u4ef6\uff0c\u56e0\u6b64Oracle\u5728\u5168\u8868\u626b\u63cf\u540e\u7701\u7565\u6389\u4e86\u539f\u672c\u5e94\u8be5\u505a\u7684TYPE IS NOT NULL\u7684\u8fc7\u6ee4\uff0c\u800c\u76f4\u63a5\u5c06\u7ed3\u679c\u8fd4\u56de\u7ed9\u7528\u6237\uff0c\u9020\u6210\u4e86TYPE IS NOT NULL\u6761\u4ef6\u8fd4\u56de\u7684\u7ed3\u679c\u662fNULL\u7684\u60c5\u51b5\u3002<br \/>\n\u7b80\u5355\u7684\u8bf4\uff0c\u5bfc\u81f4\u8fd9\u4e2a\u95ee\u9898\u7684\u539f\u56e0\u662f\u7531\u4e8e\u9519\u8bef\u7684\u6570\u636e\u5b58\u50a8\u4e8e\u8868\u4e2d\uff0c\u800c\u8fd9\u5bfc\u81f4\u4e86CBO\u5728\u5224\u65ad\u65f6\u51fa\u73b0\u4e86\u9519\u8bef\uff0c\u5bfc\u81f4\u548c\u9884\u671f\u76f8\u53cd\u7684\u7ed3\u679c\u8fd4\u56de\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>BLOG\u6709\u4e09\u5e74\u6ca1\u6709\u66f4\u65b0\u4e86\uff0c\u5176\u5b9e\u8fd9\u7bc7\u6587\u6863\u4e5f\u662f\u4e09\u5e74\u524d\u5199\u7684\uff0c\u4e0d\u8fc7\u5f53\u65f6\u6ca1\u6709\u8d34\u51fa\u6765\uff0c\u4eca\u5929\u770b\u5230\u6709\u4eba\u95ee\u8d77\uff0c\u4e8e\u662f\u5206\u4eab\u51fa\u6765\u3002 \u8fd9\u662f\u5ba2\u6237\u6570\u636e\u5e93\u4e2d\u78b0\u5230\u7684\u4e00\u4e2a\u6709\u610f\u601d\u7684\u95ee\u9898\u3002 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