{"id":1524,"date":"2018-12-24T23:54:13","date_gmt":"2018-12-24T15:54:13","guid":{"rendered":"https:\/\/yangtingkun.net\/?p=1524"},"modified":"2018-12-25T00:02:34","modified_gmt":"2018-12-24T16:02:34","slug":"12c%e6%96%b0%e5%a2%9e%e5%b9%b6%e8%a1%8c%e7%b4%a2%e5%bc%95%e6%89%ab%e6%8f%8f","status":"publish","type":"post","link":"https:\/\/yangtingkun.net\/?p=1524","title":{"rendered":"12c\u65b0\u589e\u5e76\u884c\u7d22\u5f15\u626b\u63cf"},"content":{"rendered":"

Oracle\u572812c\u4e4b\u524d\u5bf9\u4e8e\u7d22\u5f15\u8303\u56f4\u626b\u63cf\u662f\u6ca1\u6709\u529e\u6cd5\u5e76\u884c\u6267\u884c\u7684\uff0c\u4ece12.1\u5f00\u59cb\uff0cOracle\u53ef\u4ee5\u5e76\u884c\u7684\u6267\u884c\u7d22\u5f15\u626b\u63cf\u3002<\/span><\/span><\/p>\n

\u9996\u5148\u521b\u5efa\u6d4b\u8bd5\u73af\u5883\uff1a<\/span><\/p>\n

SQL> create table t_para_ind (id number, name varchar2(30), created date);<\/span><\/p>\n

\u00a0<\/span><\/p>\n

Table created.<\/span><\/p>\n

\u00a0<\/span><\/p>\n

SQL> insert into t_para_ind select id, object_name, created from t_big;<\/span><\/p>\n

\u00a0<\/span><\/p>\n

6735106 rows created.<\/span><\/p>\n

\u00a0<\/span><\/p>\n

SQL> commit;<\/span><\/p>\n

\u00a0<\/span><\/p>\n

Commit complete.<\/span><\/p>\n

\u00a0<\/span><\/p>\n

SQL> create index ind_para_created on t_para_ind (created);<\/span><\/p>\n

\u00a0<\/span><\/p>\n

Index created.<\/span><\/p>\n

\u00a0<\/span><\/p>\n

SQL> select banner from v$version;<\/span><\/p>\n

\u00a0<\/span><\/p>\n

BANNER<\/span><\/p>\n

——————————————————————————–<\/span><\/p>\n

Oracle Database 18c Enterprise Edition Release 18.0.0.0.0 \u2013 Production<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0 <\/span><\/p>\n

\u5f3a\u5236\u6267\u884c\u8ba1\u5212\u91c7\u7528\u7d22\u5f15\u626b\u63cf\uff1a<\/span><\/p>\n

SQL> select \/*+ index(t) *\/ count(name) from t_para_ind t where created >= to_date(‘201701’, ‘yyyymm’);<\/span><\/p>\n

\u00a0<\/span><\/p>\n

Elapsed: 00:00:00.61<\/span><\/p>\n

\u00a0<\/span><\/p>\n

————————————————————————————–<\/span><\/p>\n

| Id\u00a0 <\/span>| Operation\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>| Name\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>| Rows\u00a0 <\/span>| Cost (%CPU)|<\/span><\/p>\n

————————————————————————————–<\/span><\/p>\n

|\u00a0\u00a0 <\/span>0 | SELECT STATEMENT\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0 <\/span>1 | 63096\u00a0\u00a0 <\/span>(1)|<\/span><\/p>\n

|\u00a0\u00a0 <\/span>1 |\u00a0 <\/span>SORT AGGREGATE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0 <\/span>1 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0\u00a0 <\/span>2 |\u00a0\u00a0 <\/span>TABLE ACCESS BY INDEX ROWID <\/a>BATCHED| T_PARA_IND\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0 <\/span>3365K| 63096\u00a0\u00a0 <\/span>(1)|<\/span><\/p>\n

|*\u00a0 <\/span>3 |\u00a0\u00a0\u00a0 <\/span>INDEX RANGE SCAN\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>| IND_PARA_CREATED |\u00a0 <\/span>3672K|\u00a0 <\/span>9850\u00a0\u00a0 <\/span>(2)|<\/span><\/p>\n

————————————————————————————–<\/span><\/p>\n

\u00a0<\/span><\/p>\n

\u4e0b\u9762\u8bbe\u7f6e\u8bed\u53e5\u7ea7\u5e76\u884c\u6267\u884c\uff0c\u9996\u5148\u5c06\u4f18\u5316\u5668\u53c2\u6570\u8bbe\u7f6e\u4e3a11.2.0.4\u7248\u672c\uff1a<\/span><\/p>\n

SQL> select \/*+ index(t) parallel(2) opt_param(‘optimizer_features_enable’, ‘11.2.0.4’) *\/ count(name) from t_para_ind t where created >= to_date(‘201701’, ‘yyyymm’);<\/span><\/p>\n

\u00a0<\/span><\/p>\n

Elapsed: 00:00:00.64<\/span><\/p>\n

\u00a0<\/span><\/p>\n

——————————————————————————<\/span><\/p>\n

| Id\u00a0 <\/span>| Operation\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>| Name\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>| Rows\u00a0 <\/span>| Cost (%CPU)|<\/span><\/p>\n

——————————————————————————<\/span><\/p>\n

|\u00a0\u00a0 <\/span>0 | SELECT STATEMENT\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0 <\/span>1 | 63096\u00a0\u00a0 <\/span>(1)|<\/span><\/p>\n

|\u00a0\u00a0 <\/span>1 |\u00a0 <\/span>SORT AGGREGATE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0 <\/span>1 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0\u00a0 <\/span>2 |\u00a0\u00a0 <\/span>TABLE ACCESS BY INDEX ROWID| T_PARA_IND\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0 <\/span>3365K| 63096\u00a0\u00a0 <\/span>(1)|<\/span><\/p>\n

|*\u00a0 <\/span>3 |\u00a0\u00a0\u00a0 <\/span>INDEX RANGE SCAN\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>| IND_PARA_CREATED |\u00a0 <\/span>3672K|\u00a0 <\/span>9850\u00a0\u00a0 <\/span>(2)|<\/span><\/p>\n

——————————————————————————<\/span><\/p>\n

\u5bf9\u4e8e11.2.0.4\u7684\u4f18\u5316\u5668\u7248\u672c\uff0c\u5373\u4f7f\u8bbe\u7f6e\u4e86\u5e76\u884c\u63d0\u793a\uff0cOracle\u4e5f\u4f1a\u5ffd\u7565\u5e76\u884c\uff0c\u800c\u91c7\u7528\u4e32\u884c\u7d22\u5f15\u8303\u56f4\u626b\u63cf\u6267\u884c\u8ba1\u5212\u3002<\/span><\/p>\n

\u5373\u4f7f\u90fd\u662f\u7d22\u5f15\u4e32\u884c\u626b\u63cf\uff0c11.2\u548c12c\u4e2d\u8fd8\u662f\u6709\u4e00\u70b9\u5c0f\u5dee\u5f02\u7684\u3002\u572812c\u4e2d\uff0cOracle\u5f15\u5165\u4e86\u6279\u91cfROWID\u63d0\u53d6\u7684\u65b0\u7279\u6027\uff0c\u5728\u6267\u884c\u8ba1\u5212\u4e2d\u7531\u5173\u952e\u5b57BATCHED\u6807\u8bc6\u3002\u53ef\u4ee5\u770b\u523011.2\u548c12c\u4e2d\u6267\u884c\u6548\u7387\u4e5f\u6709\u5f88\u5c0f\u7684\u5dee\u5f02\uff0c\u800c\u8fd9\u4e2a\u6027\u80fd\u63d0\u5347\u5c31\u662f\u8fd9\u4e2a\u6279\u91cf\u5904\u7406\u65b0\u7279\u6027\u5e26\u6765\u7684\u3002<\/span><\/p>\n

Oracle\u65e0\u6cd5\u91c7\u7528\u5e76\u884c\u6267\u884c\u7684\u539f\u56e0\u662f\u7531\u7d22\u5f15\u7684\u5b58\u50a8\u7ed3\u6784\u51b3\u5b9a\u7684\uff0c\u5f53\u6267\u884c\u7d22\u5f15\u8bbf\u95ee\u65f6\uff0cOracle\u9996\u5148\u5b9a\u4f4d\u5230Btree\u7d22\u5f15\u7684\u6839\u8282\u70b9\uff0c\u901a\u8fc7\u4e0e\u6839\u8282\u70b9\u4e2d\u5b58\u50a8\u7684\u952e\u503c\u524d\u7f00\u8fdb\u884c\u6bd4\u8f83\uff0c\u5b9a\u4f4d\u5230\u679d\u53f6\u8282\u70b9\uff0c\u91cd\u590d\u6bd4\u8f83\u7684\u8fc7\u7a0b\uff0c\u6700\u7ec8\u5b9a\u4f4d\u5230\u53f6\u5b50\u8282\u70b9\u3002\u5728\u53f6\u5b50\u8282\u70b9\u4e0aOracle\u627e\u5230\u4e86\u7b2c\u4e00\u6761\u6ee1\u8db3\u6761\u4ef6\u7684\u952e\u503c\uff0c\u7136\u540eOracle\u4f1a\u6839\u636e\u53f6\u8282\u70b9\u4e0a\u7684\u94fe\u8868\u626b\u63cf\u4e0b\u4e00\u4e2a\u53f6\u8282\u70b9\uff0c\u4e0d\u65ad\u91cd\u590d\u8fd9\u4e2a\u8fc7\u7a0b\uff0c\u76f4\u5230\u4e0d\u6ee1\u8db3\u67e5\u8be2\u9650\u5236\u6761\u4ef6\u7684\u8bb0\u5f55\u51fa\u73b0\u3002<\/span><\/span><\/p>\n

\u4e5f\u5c31\u662f\u8bf4Oracle\u9700\u8981\u6839\u636e\u987a\u5e8f\u8bbf\u95ee\u4e00\u6761\u94fe\u8868\uff0c\u53ea\u6709\u627e\u5230\u7b2c\u4e00\u4e2a\u7d22\u5f15\u5757\u624d\u77e5\u9053\u4e0b\u4e00\u4e2a\u8981\u8bbf\u95ee\u7684\u7d22\u5f15\u5757\u5728\u54ea\u91cc\uff0c\u56e0\u6b64\u8fd9\u4e2a\u8fc7\u7a0b\u6ca1\u6709\u529e\u6cd5\u62c6\u5206\u5230\u591a\u4e2a\u8fdb\u7a0b\u540c\u65f6\u6267\u884c\uff0c\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u7d22\u5f15\u8303\u56f4\u626b\u63cf\u4e00\u76f4\u65e0\u6cd5\u5e76\u884c\u7684\u539f\u56e0\u3002<\/span><\/p>\n

Oracle\u572812c\u4e2d\u4f7f\u5f97\u7d22\u5f15\u626b\u63cf\u53ef\u4ee5\u5e76\u884c\u6267\u884c\uff0c\u4e0b\u9762\u770b\u770bOracle\u662f\u5982\u4f55\u5b9e\u73b0\u7684\uff1a<\/span><\/span><\/p>\n

SQL> select \/*+ index(t) parallel(2) *\/ count(name) from t_para_ind t where created >= to_date(‘201701’, ‘yyyymm’);<\/span><\/p>\n

\u00a0<\/span><\/p>\n

Elapsed: 00:00:00.38<\/span><\/p>\n

\u00a0<\/span><\/p>\n

—————————————————————————————-<\/span><\/p>\n

|Id |Operation\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|Name\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0 <\/span>TQ |IN-OUT|PQ Distrib |<\/span><\/p>\n

—————————————————————————————-<\/span><\/p>\n

|\u00a0 <\/span>0|SELECT STATEMENT\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0 <\/span>1| SORT AGGREGATE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0 <\/span>2|\u00a0 <\/span>PX COORDINATOR\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0 \u00a0|\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0 <\/span>3|\u00a0\u00a0 <\/span>PX SEND QC (RANDOM)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|:TQ10001\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|Q1,01| P->S |QC (RAND)\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0 <\/span>4|\u00a0\u00a0\u00a0 <\/span>SORT AGGREGATE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|Q1,01| PCWP |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0 <\/span>5|\u00a0\u00a0\u00a0\u00a0 <\/span>TABLE ACCESS BY INDEX ROWID BATCHED|T_PARA_IND\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|Q1,01| PCWP |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0 <\/span>6|\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>PX RECEIVE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|Q1,01| PCWP |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0 <\/span>7|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>PX SEND HASH (BLOCK ADDRESS)\u00a0\u00a0\u00a0\u00a0 <\/span>|:TQ10000\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|Q1,00| S->P |HASH (BLOCK|<\/span><\/p>\n

|\u00a0 <\/span>8|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>PX SELECTOR\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|Q1,00| SCWC |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|* 9|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>INDEX RANGE SCAN\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|IND_PARA_CREATED|Q1,00| SCWP |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

—————————————————————————————-<\/span><\/p>\n

\u4e3a\u4e86\u8f93\u51fa\u683c\u5f0f\u7684\u53ef\u8bfb\u6027\uff0c\u628a\u6267\u884c\u8ba1\u5212\u4e2d\u548c\u5f53\u524d\u5173\u7cfb\u4e0d\u5927\u7684\u5217\u53bb\u6389\u4e86\u3002<\/span><\/p>\n

\u53ef\u4ee5\u770b\u5230Oracle\u786e\u5b9e\u91c7\u7528\u4e86\u5e76\u884c\u7684\u6267\u884c\u8ba1\u5212\uff0c\u800c\u4e14\u6267\u884c\u65f6\u95f4\u4e5f\u6bd4\u4e32\u884c\u6267\u884c\u5feb\u3002<\/span><\/p>\n

\u5982\u679c\u4ed4\u7ec6\u89c2\u5bdfIN-OUT\u5217\uff0c\u5c31\u4f1a\u53d1\u73b0Oracle\u7684\u5e76\u884c\u6267\u884c\u5b9e\u9645\u4e0a\u4ece\u7b2c6\u6b65\u624d\u5f00\u59cb\uff0c\u7b2c7\u6b65\u662f\u4e32\u884c\u5230\u5e76\u884c\u7684\u8fc7\u7a0b\uff0c\u800c\u7b2c7\u6b65\u4e4b\u524d\u7684\u7b2c9\u6b65\u548c\u7b2c8\u6b65\u90fd\u662f\u4e32\u884c\u6267\u884c\u3002<\/span><\/p>\n

\u4e5f\u5c31\u662f\u8bf4Oracle\u628a\u7d22\u5f15\u8303\u56f4\u626b\u63cf\u7684\u8fc7\u7a0b\u5206\u6210\u4e86\u4e24\u90e8\u5206\uff0c\u4e00\u90e8\u5206\u662f\u4e4b\u524d\u8ba8\u8bba\u7684\u7d22\u5f15\u8303\u56f4\u626b\u63cf\u90e8\u5206\uff0c\u800c\u53e6\u4e00\u90e8\u5206\u662f\u7d22\u5f15\u626b\u63cf\u540e\u6839\u636erowid\u7684\u8bfb\u53d6\u8868\u4e2d\u8bb0\u5f55\u7684\u8fc7\u7a0b\u3002\u5bf9\u4e8e\u524d\u8005\uff0c\u5373\u4f7f\u662f\u572812c\u4e2d\uff0cOracle\u4ecd\u7136\u91c7\u7528\u4e32\u884c\u7684\u626b\u63cf\u65b9\u5f0f\u6267\u884c\uff0c\u800c\u5bf9\u4e8e\u540e\u8005\uff0cOracle\u5c06\u5176\u5e76\u884c\u5316\u3002\u8fd9\u4e5f\u662f\u6027\u80fd\u63d0\u5347\u7684\u7531\u6765\u3002<\/span><\/p>\n

SQL> select \/*+ index(t) parallel(4) *\/ count(name) from t_para_ind t where created >= to_date(‘201701’, ‘yyyymm’);<\/span><\/p>\n

\u00a0<\/span><\/p>\n

Elapsed: 00:00:00.56<\/span><\/p>\n

\u00a0<\/span><\/p>\n

—————————————————————————————-<\/span><\/p>\n

|Id |Operation\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|Name\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0 <\/span>TQ |IN-OUT|PQ Distrib |<\/span><\/p>\n

—————————————————————————————-<\/span><\/p>\n

|\u00a0 <\/span>0|SELECT STATEMENT\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0 <\/span>1| SORT AGGREGATE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0|\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0 <\/span>2|\u00a0 <\/span>PX COORDINATOR\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0 <\/span>3|\u00a0\u00a0 <\/span>PX SEND QC (RANDOM)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|:TQ10001\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|Q1,01| P->S |QC (RAND)\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0 <\/span>4|\u00a0\u00a0\u00a0 <\/span>SORT AGGREGATE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|Q1,01| PCWP |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0 <\/span>5|\u00a0\u00a0\u00a0\u00a0 <\/span>TABLE ACCESS BY INDEX ROWID BATCHED|T_PARA_IND\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|Q1,01| PCWP |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0 <\/span>6|\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>PX RECEIVE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|Q1,01| PCWP |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0 <\/span>7|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>PX SEND HASH (BLOCK ADDRESS)\u00a0\u00a0\u00a0\u00a0 <\/span>|:TQ10000\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|Q1,00| S->P |HASH (BLOCK|<\/span><\/p>\n

|\u00a0 <\/span>8|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>PX SELECTOR\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|Q1,00| SCWC |\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0|<\/span><\/p>\n

|* 9|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>INDEX RANGE SCAN\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|IND_PARA_CREATED|Q1,00| SCWP |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

—————————————————————————————-<\/span><\/p>\n

\u4f46\u662f\u8fd9\u79cd\u65b9\u5f0f\u7684\u5206\u62c6\u5e76\u4e0d\u662f\u771f\u6b63\u610f\u4e49\u7684\u5e76\u884c\uff0c\u56e0\u4e3a\u5176\u4e2d\u7684\u4e00\u90e8\u5206\u662f\u65e0\u6cd5\u5e76\u884c\u7684\uff0c\u6240\u4ee5\u5f53\u6211\u4eec\u8fdb\u4e00\u6b65\u52a0\u5927\u5e76\u884c\u5ea6\u7684\u65f6\u5019\uff0c\u6267\u884c\u65f6\u95f4\u53cd\u800c\u53d8\u957f\u4e86\u3002<\/span><\/p>\n

SQL> select \/*+ index(t) parallel(4) *\/ count(*) from t_para_ind t where created >= to_date(‘201701’, ‘yyyymm’);<\/span><\/p>\n

\u00a0<\/span><\/p>\n

Elapsed: 00:00:00.17<\/span><\/p>\n

\u00a0<\/span><\/p>\n

——————————————————————-<\/span><\/p>\n

| Id\u00a0 <\/span>| Operation\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>| Name\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>| Rows\u00a0 <\/span>| Cost (%CPU)|<\/span><\/p>\n

——————————————————————-<\/span><\/p>\n

|\u00a0\u00a0 <\/span>0 | SELECT STATEMENT\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0 <\/span>1 |\u00a0 <\/span>9850\u00a0\u00a0 <\/span>(2)|<\/span><\/p>\n

|\u00a0\u00a0 <\/span>1 |\u00a0 <\/span>SORT AGGREGATE\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0 <\/span>1 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|*\u00a0 <\/span>2 |\u00a0\u00a0 <\/span>INDEX RANGE SCAN| IND_PARA_CREATED |\u00a0 <\/span>3365K|\u00a0 <\/span>9850\u00a0\u00a0 <\/span>(2)|<\/span><\/p>\n

——————————————————————-<\/span><\/p>\n

\u800c\u5982\u679c\u6211\u4eec\u4fee\u6539SQL\u8bed\u53e5\uff0c\u628a\u539f\u672c\u7684COUNT(NAME)\u6539\u4e3aCOUNT(*)\uff0c\u8fd9\u65f6\u7531\u4e8e\u6267\u884c\u8ba1\u5212\u4e2d\u56de\u8868\u90e8\u5206\u4e0d\u518d\u9700\u8981\uff0c\u6267\u884c\u8ba1\u5212\u53ea\u5269\u4e0b\u4e0d\u80fd\u5e76\u884c\u7684\u7d22\u5f15\u626b\u63cf\u90e8\u5206\uff0c\u56e0\u6b64\u6267\u884c\u8ba1\u5212\u53c8\u6062\u590d\u4e86\u4e32\u884c\u6267\u884c\u3002\u8fd9\u53c8\u4e00\u6b21\u8bc1\u5b9e\u4e8612c\u7684\u5e76\u884c\u7d22\u5f15\u626b\u63cf\u53ea\u662f\u90e8\u5206\u5e76\u884c\uff0c\u5176\u63d0\u5347\u603b\u4f53\u626b\u63cf\u6548\u7387\u7684\u80fd\u529b\u662f\u6709\u9650\u7684\u3002<\/span><\/p>\n

\u4e0b\u9762\u770b\u770b\u5168\u8868\u626b\u63cf\u7684\u5e76\u884c\u6267\u884c\uff1a<\/span><\/p>\n

SQL> select count(name) from t_para_ind t where created >= to_date(‘201701’, ‘yyyymm’);<\/span><\/p>\n

\u00a0<\/span><\/p>\n

Elapsed: 00:00:00.24<\/span><\/p>\n

\u00a0<\/span><\/p>\n

————————————————————–<\/span><\/p>\n

| Id\u00a0 <\/span>| Operation\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>| Name\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>| Rows\u00a0 <\/span>| Cost (%CPU)|<\/span><\/p>\n

————————————————————–<\/span><\/p>\n

|\u00a0\u00a0 <\/span>0 | SELECT STATEMENT\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0 <\/span>1 | 11519\u00a0\u00a0 <\/span>(2)|<\/span><\/p>\n

|\u00a0\u00a0 <\/span>1 |\u00a0 <\/span>SORT AGGREGATE\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0 <\/span>1 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|*\u00a0 <\/span>2 |\u00a0\u00a0 <\/span>TABLE ACCESS FULL| T_PARA_IND |\u00a0 <\/span>3073K| 11519\u00a0\u00a0 <\/span>(2)|<\/span><\/p>\n

————————————————————–<\/span><\/p>\n

\u4e32\u884c\u5168\u8868\u626b\u63cf\u65f6\uff0c\u6267\u884c\u65f6\u95f4\u4e3a0.24\u79d2\u3002<\/span><\/p>\n

SQL> select \/*+ parallel(2) *\/ count(name) from t_para_ind t where created >= to_date(‘201701’, ‘yyyymm’);<\/span><\/p>\n

\u00a0<\/span><\/p>\n

Elapsed: 00:00:00.15<\/span><\/p>\n

\u00a0<\/span><\/p>\n

————————————————————————–<\/span><\/p>\n

| Id\u00a0 <\/span>| Operation\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>| Name\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0 <\/span>TQ\u00a0 <\/span>|IN-OUT| PQ Distrib |<\/span><\/p>\n

————————————————————————–<\/span><\/p>\n

|\u00a0\u00a0 <\/span>0 | SELECT STATEMENT\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0\u00a0 <\/span>1 |\u00a0 <\/span>SORT AGGREGATE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0\u00a0 <\/span>2 |\u00a0\u00a0 <\/span>PX COORDINATOR\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0\u00a0 <\/span>3 |\u00a0\u00a0\u00a0 <\/span>PX SEND QC (RANDOM) | :TQ10000\u00a0\u00a0 <\/span>|\u00a0 <\/span>Q1,00 | P->S | QC (RAND)\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0\u00a0 <\/span>4 |\u00a0\u00a0\u00a0\u00a0 <\/span>SORT AGGREGATE\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0 <\/span>Q1,00 | PCWP |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0\u00a0 <\/span>5 |\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>PX BLOCK ITERATOR |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0 <\/span>Q1,00 | PCWC |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|*\u00a0 <\/span>6 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>TABLE ACCESS FULL| T_PARA_IND |\u00a0 <\/span>Q1,00 | PCWP |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

————————————————————————–<\/span><\/p>\n

\u5f00\u542f2\u8def\u5e76\u884c\u65f6\uff0c\u6267\u884c\u65f6\u95f4\u4e3a0.15\u79d2\u3002<\/span><\/p>\n

SQL> select \/*+ parallel(4) *\/ count(name) from t_para_ind t where created >= to_date(‘201701’, ‘yyyymm’);<\/span><\/p>\n

\u00a0<\/span><\/p>\n

Elapsed: 00:00:00.08<\/span><\/p>\n

\u00a0<\/span><\/p>\n

————————————————————————–<\/span><\/p>\n

| Id\u00a0 <\/span>| Operation\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>| Name\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0 <\/span>TQ\u00a0 <\/span>|IN-OUT| PQ Distrib |<\/span><\/p>\n

————————————————————————–<\/span><\/p>\n

|\u00a0\u00a0 <\/span>0 | SELECT STATEMENT\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0\u00a0 <\/span>1 |\u00a0 <\/span>SORT AGGREGATE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0\u00a0 <\/span>2 |\u00a0\u00a0 <\/span>PX COORDINATOR\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0\u00a0 <\/span>3 |\u00a0\u00a0\u00a0 <\/span>PX SEND QC (RANDOM) | :TQ10000\u00a0\u00a0 <\/span>|\u00a0 <\/span>Q1,00 | P->S | QC (RAND)\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0\u00a0 <\/span>4 |\u00a0\u00a0\u00a0\u00a0 <\/span>SORT AGGREGATE\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0 <\/span>Q1,00 | PCWP |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|\u00a0\u00a0 <\/span>5 |\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>PX BLOCK ITERATOR |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|\u00a0 <\/span>Q1,00 | PCWC |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

|*\u00a0 <\/span>6 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>TABLE ACCESS FULL| T_PARA_IND |\u00a0 <\/span>Q1,00 | PCWP |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>|<\/span><\/p>\n

————————————————————————–<\/span><\/p>\n

\u5f00\u542f4\u8def\u5e76\u884c\u65f6\uff0c\u6267\u884c\u65f6\u95f4\u964d\u4f4e\u5230\u4e860.08\u79d2\u3002\u663e\u7136\u5168\u8868\u626b\u63cf\u624d\u662f\u771f\u6b63\u7684\u5e76\u884c\uff0c\u5728\u5408\u7406\u7684\u6570\u636e\u91cf\u548c\u8d44\u6e90\u6d88\u8017\u8303\u56f4\u5185\uff0c\u5176\u6267\u884c\u65f6\u95f4\u662f\u968f\u7740\u5e76\u884c\u5ea6\u589e\u5927\u800c\u7b49\u6bd4\u964d\u4f4e\u7684\u3002<\/span><\/p>\n

\u00a0<\/span><\/p>\n

\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Oracle\u572812c\u4e4b\u524d\u5bf9\u4e8e\u7d22\u5f15\u8303\u56f4\u626b\u63cf\u662f\u6ca1\u6709\u529e\u6cd5\u5e76\u884c\u6267\u884c\u7684\uff0c\u4ece12.1\u5f00\u59cb\uff0cOracle\u53ef\u4ee5\u5e76\u884c\u7684\u6267\u884c\u7d22\u5f15\u626b\u63cf\u3002 \u9996\u5148\u521b\u5efa\u6d4b\u8bd5\u73af\u5883\uff1a SQL> create table t_para_ind (id number, name varchar2(30), created date); \u00a0 Table created. \u00a0 SQL> insert into t_para_ind select id, object_name, created from t_big; \u00a0 6735106 rows created. \u00a0 SQL> commit; \u00a0 Commit complete. \u00a0 SQL> create index … Continue reading →<\/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":[1302,152],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2yiY3-oA","_links":{"self":[{"href":"https:\/\/yangtingkun.net\/index.php?rest_route=\/wp\/v2\/posts\/1524"}],"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=1524"}],"version-history":[{"count":3,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=\/wp\/v2\/posts\/1524\/revisions"}],"predecessor-version":[{"id":1527,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=\/wp\/v2\/posts\/1524\/revisions\/1527"}],"wp:attachment":[{"href":"https:\/\/yangtingkun.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1524"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1524"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1524"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}