{"id":967,"date":"2012-06-28T23:47:04","date_gmt":"2012-06-28T15:47:04","guid":{"rendered":"https:\/\/yangtingkun.net\/?p=967"},"modified":"2012-07-02T08:52:16","modified_gmt":"2012-07-02T00:52:16","slug":"hash%e5%88%86%e5%8c%ba%e6%96%b0%e5%a2%9e%e5%88%86%e5%8c%ba%e5%af%b9%e7%b4%a2%e5%bc%95%e7%8a%b6%e6%80%81%e7%9a%84%e5%bd%b1%e5%93%8d","status":"publish","type":"post","link":"https:\/\/yangtingkun.net\/?p=967","title":{"rendered":"HASH\u5206\u533a\u65b0\u589e\u5206\u533a\u5bf9\u7d22\u5f15\u72b6\u6001\u7684\u5f71\u54cd"},"content":{"rendered":"<p>\u4e00\u76f4\u8ba4\u4e3aOracle\u5bf9\u4e8e\u6240\u6709\u5206\u533a\u7684\u64cd\u4f5c\u90fd\u662f\u4e00\u6837\u7684\uff0c\u53ea\u6709\u6570\u636e\u7684\u6539\u53d8\u624d\u4f1a\u5bfc\u81f4\u5206\u533a\u72b6\u6001\u7684\u5931\u6548\uff0c\u6ca1\u60f3\u5230HASH\u5206\u533a\u7684\u5b9e\u73b0\u65b9\u5f0f\u5e76\u4e0d\u76f8\u540c\u3002<br \/>\nHASH\u5206\u533a\u8868\u589e\u52a0\u65b0\u7684\u5206\u533a\u7684\u4e00\u70b9\u7814\u7a76\uff1a<a href=\"http:\/\/yangtingkun.itpub.net\/post\/468\/195510\">http:\/\/yangtingkun.itpub.net\/post\/468\/195510<\/a><br \/>\n\u770b\u4e00\u4e2a\u8303\u56f4\u5206\u533aSPLIT\u7684\u4f8b\u5b50\uff1a<\/p>\n<pre lang='SQL'>SQL> CREATE TABLE T_PART \r\n  2  (ID NUMBER, NAME VARCHAR2(30))\r\n  3  PARTITION BY RANGE (ID)\r\n  4  (PARTITION P1 VALUES LESS THAN (10), \r\n  5  PARTITION PMAX VALUES LESS THAN (MAXVALUE));\r\nTable created.\r\nSQL> INSERT INTO T_PART\r\n  2  SELECT ROWNUM, TNAME  \r\n  3  FROM TAB;\r\n12 rows created.\r\nSQL> CREATE INDEX IND_T_PART_ID ON T_PART(ID) LOCAL;\r\nIndex created.\r\nSQL> SELECT INDEX_NAME, PARTITION_NAME, STATUS \r\n  2  FROM USER_IND_PARTITIONS\r\n  3  WHERE INDEX_NAME = 'IND_T_PART_ID';\r\nINDEX_NAME                     PARTITION_NAME                 STATUS\r\n------------------------------ ------------------------------ --------\r\nIND_T_PART_ID                  P1                             USABLE\r\nIND_T_PART_ID                  PMAX                           USABLE\r\nSQL> SELECT COUNT(*) FROM T_PART PARTITION (PMAX);\r\n  COUNT(*)\r\n----------\r\n         3\r\nSQL> ALTER TABLE T_PART SPLIT PARTITION PMAX AT (20)\r\n  2  INTO (PARTITION P2, PARTITION P3);\r\nTable altered.\r\nSQL> SELECT INDEX_NAME, PARTITION_NAME, STATUS \r\n  2  FROM USER_IND_PARTITIONS\r\n  3  WHERE INDEX_NAME = 'IND_T_PART_ID';\r\nINDEX_NAME                     PARTITION_NAME                 STATUS\r\n------------------------------ ------------------------------ --------\r\nIND_T_PART_ID                  P2                             USABLE\r\nIND_T_PART_ID                  P3                             USABLE\r\nIND_T_PART_ID                  P1                             USABLE<\/pre>\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u5bf9\u4e8e\u8303\u56f4\u5206\u533a\u800c\u8a00\uff0c\u5373\u4f7f\u662fSPLIT\u5305\u542b\u6570\u636e\u7684\u5206\u533a\uff0c\u53ea\u8981\u6ca1\u6709\u771f\u6b63\u5bfc\u81f4\u6570\u636e\u53d1\u751f\u53d8\u5316\uff0c\u5c31\u4e0d\u4f1a\u5bfc\u81f4\u7d22\u5f15\u7684\u5931\u6548\u3002\u8fd9\u91cc\u5c06PMAX\u5206\u533aSPLIT\u6210P2\u548cP3\u4e24\u4e2a\u5206\u533a\uff0c\u5176\u4e2dPMAX\u4e2d\u7684\u6240\u6709\u6570\u636e\u90fd\u8fdb\u5165P2\u5206\u533a\uff0c\u800cP3\u5206\u533a\u4e3a\u7a7a\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\u6ca1\u6709\u6570\u636e\u7684\u6539\u53d8\uff0c\u56e0\u6b64\u6240\u6709\u5206\u533a\u7d22\u5f15\u7684\u72b6\u6001\u90fd\u4e0d\u4f1a\u53d8\u4e3aUNUSABLE\u3002<br \/>\n\u4f46\u662fHASH\u5206\u533a\u7684ADD PARTITION\u5e76\u6ca1\u6709\u9075\u5b88\u8fd9\u4e2a\u89c4\u5219\uff0c\u4e8b\u5b9e\u4e0a\u5bf9\u4e8e\u6bcf\u6b21ADD\u5206\u533a\uff0c\u90fd\u4f1a\u5bfc\u81f4\u4e00\u4e2a\u5206\u533a\u7684\u6570\u636e\u53d1\u751f\u5206\u88c2\uff0c\u800c\u5206\u88c2\u7684\u7ed3\u679c\u4e0d\u7ba1\u539f\u5206\u533a\u7684\u6570\u636e\u662f\u5426\u53d1\u751f\u53d8\u5316\uff0c\u90fd\u4f1a\u5bfc\u81f4\u539f\u5206\u533a\u7d22\u5f15\u72b6\u6001\u53d8\u4e3aUNUSABLE\uff0c\u81f3\u4e8e\u65b0\u589e\u5206\u533a\u7684\u7d22\u5f15\u72b6\u6001\uff0c\u5219\u53d6\u51b3\u4e8e\u662f\u5426\u6709\u6570\u636e\u7684\u6539\u53d8\u3002<\/p>\n<pre lang='SQL'>SQL> CREATE TABLE T_HASH \r\n  2  (ID NUMBER)\r\n  3  PARTITION BY HASH (ID)\r\n  4  (PARTITION P1,\r\n  5  PARTITION P2, \r\n  6  PARTITION P3, \r\n  7  PARTITION P4);\r\nTable created.\r\nSQL> CREATE INDEX IND_T_HASH_ID ON T_HASH(ID) LOCAL;\r\nIndex created.\r\nSQL> INSERT INTO T_HASH SELECT ROWNUM FROM TAB;\r\n12 rows created.\r\nSQL> COMMIT;\r\nCommit complete.\r\nSQL> SELECT INDEX_NAME, PARTITION_NAME, STATUS\r\n  2  FROM USER_IND_PARTITIONS\r\n  3  WHERE INDEX_NAME = 'IND_T_HASH_ID';\r\nINDEX_NAME                     PARTITION_NAME                 STATUS\r\n------------------------------ ------------------------------ --------\r\nIND_T_HASH_ID                  P1                             USABLE\r\nIND_T_HASH_ID                  P2                             USABLE\r\nIND_T_HASH_ID                  P3                             USABLE\r\nIND_T_HASH_ID                  P4                             USABLE\r\nSQL> SELECT * FROM T_HASH PARTITION (P1);\r\n        ID\r\n----------\r\n         6\r\n        11\r\nSQL> SELECT * FROM T_HASH PARTITION (P2);\r\n        ID\r\n----------\r\n         9\r\n        10\r\n        12\r\nSQL> SELECT * FROM T_HASH PARTITION (P3);\r\n        ID\r\n----------\r\n         2\r\n         5\r\n         8\r\nSQL> SELECT * FROM T_HASH PARTITION (P4);\r\n        ID\r\n----------\r\n         1\r\n         3\r\n         4\r\n         7<\/pre>\n<p>\u4e0b\u9762\u65b0\u589e\u4e00\u4e2aPARTITION P5\uff1a<\/p>\n<pre lang='SQL'>SQL> ALTER TABLE T_HASH ADD PARTITION P5;\r\nTable altered.\r\nSQL> SELECT * FROM T_HASH PARTITION (P5);\r\nno rows selected\r\nSQL> SELECT INDEX_NAME, PARTITION_NAME, STATUS\r\n  2  FROM USER_IND_PARTITIONS\r\n  3  WHERE INDEX_NAME = 'IND_T_HASH_ID';\r\nINDEX_NAME                     PARTITION_NAME                 STATUS\r\n------------------------------ ------------------------------ --------\r\nIND_T_HASH_ID                  P5                             USABLE\r\nIND_T_HASH_ID                  P1                             UNUSABLE\r\nIND_T_HASH_ID                  P2                             USABLE\r\nIND_T_HASH_ID                  P3                             USABLE\r\nIND_T_HASH_ID                  P4                             USABLE<\/pre>\n<p>\u65b0\u589e\u7684PARTITION P5\u4e2d\u5e76\u6ca1\u6709\u4efb\u4f55\u7684\u6570\u636e\uff0c\u4e5f\u5c31\u662f\u8bf4\u6ca1\u6709\u4efb\u4f55\u7684\u6570\u636e\u4eceP1\u8fc1\u79fb\u5230P5\u4e2d\uff0c\u4f46\u662f\u67e5\u8be2\u5206\u533a\u7d22\u5f15\u7684\u72b6\u6001\u53d1\u73b0\uff0cP1\u5bf9\u5e94\u7684\u5206\u533a\u7d22\u5f15\u72b6\u6001\u5df2\u7ecf\u53d8\u4e3aUNUSABLE\u3002\u8fd9\u548c\u8303\u56f4\u5206\u533a\u7684\u5904\u7406\u65b9\u5f0f\u5b8c\u5168\u4e0d\u540c\u3002\u800cP5\u5206\u533a\u7531\u4e8e\u6ca1\u6709\u4efb\u4f55\u6570\u636e\uff0c\u56e0\u6b64\u5206\u533a\u72b6\u6001\u662fUSABLE\u3002<\/p>\n<pre lang='SQL'>SQL> ALTER TABLE T_HASH ADD PARTITION P6;\r\nTable altered.\r\nSQL> SELECT INDEX_NAME, PARTITION_NAME, STATUS\r\n  2  FROM USER_IND_PARTITIONS \r\n  3  WHERE INDEX_NAME = 'IND_T_HASH_ID';\r\nINDEX_NAME                     PARTITION_NAME                 STATUS\r\n------------------------------ ------------------------------ --------\r\nIND_T_HASH_ID                  P5                             USABLE\r\nIND_T_HASH_ID                  P6                             UNUSABLE\r\nIND_T_HASH_ID                  P1                             UNUSABLE\r\nIND_T_HASH_ID                  P2                             UNUSABLE\r\nIND_T_HASH_ID                  P3                             USABLE\r\nIND_T_HASH_ID                  P4                             USABLE\r\n6 rows selected.\r\nSQL> DELETE T_HASH WHERE ID = 5;        \r\n1 row deleted.\r\nSQL> COMMIT;\r\nCommit complete.\r\nSQL> ALTER TABLE T_HASH ADD PARTITION P7;\r\nTable altered.\r\nSQL> SELECT INDEX_NAME, PARTITION_NAME, STATUS \r\n  2  FROM USER_IND_PARTITIONS \r\n  3  WHERE INDEX_NAME = 'IND_T_HASH_ID';\r\nINDEX_NAME                     PARTITION_NAME                 STATUS\r\n------------------------------ ------------------------------ --------\r\nIND_T_HASH_ID                  P5                             USABLE\r\nIND_T_HASH_ID                  P6                             UNUSABLE\r\nIND_T_HASH_ID                  P7                             UNUSABLE\r\nIND_T_HASH_ID                  P1                             UNUSABLE\r\nIND_T_HASH_ID                  P2                             UNUSABLE\r\nIND_T_HASH_ID                  P3                             UNUSABLE\r\nIND_T_HASH_ID                  P4                             USABLE\r\n7 rows selected.\r\nSQL> SELECT * FROM T_HASH PARTITION (P3);\r\nno rows selected\r\nSQL> SELECT * FROM T_HASH PARTITION (P7);\r\n        ID\r\n----------\r\n         2\r\n         8<\/pre>\n<p>\u4e3a\u4e86\u66f4\u597d\u7684\u8bf4\u660e\u8fd9\u4e2a\u95ee\u9898\uff0c\u5728\u589e\u52a0PARTITION P7\u4e4b\u524d\uff0c\u5220\u9664\u4e86ID\u4e3a5\u7684\u8bb0\u5f55\uff0c\u8fd9\u662f\u589e\u52a0\u5206\u533a\u540e\u53ef\u4ee5\u53d1\u73b0\uff0c\u539f\u6709\u7684P3\u5df2\u7ecf\u4e0d\u5305\u542b\u4efb\u4f55\u7684\u6570\u636e\uff0c\u5168\u90e8\u7684\u8bb0\u5f55\u90fd\u8fdb\u5165\u5230\u65b0\u589e\u7684P7\u5206\u533a\uff0c\u4f46\u662f\u65e0\u8bba\u662fP3\u8fd8\u662fP7\uff0c\u72b6\u6001\u90fd\u662fUNUSABLE\u3002\u8fd9\u8bc1\u660e\u4e86\u524d\u9762\u63d0\u5230\u7684\uff0c\u53ea\u8981\u662f\u65b0\u589eHASH\u5206\u533a\uff0c\u5c31\u4f1a\u5bfc\u81f4\u6e90\u5206\u533a\u7d22\u5f15\u72b6\u6001\u53d8\u4e3aUNUSABLE\uff0c\u9664\u975e\u662f\u4e00\u79cd\u60c5\u51b5\uff1a\u6e90\u5206\u533a\u672c\u8eab\u5c31\u6ca1\u6709\u6570\u636e\uff1a<\/p>\n<pre lang='SQL'>SQL> ALTER TABLE T_HASH ADD PARTITION P8;\r\nTable altered.\r\nSQL> SELECT INDEX_NAME, PARTITION_NAME, STATUS                          \r\n  2  FROM USER_IND_PARTITIONS \r\n  3  WHERE INDEX_NAME = 'IND_T_HASH_ID';\r\nINDEX_NAME                     PARTITION_NAME                 STATUS\r\n------------------------------ ------------------------------ --------\r\nIND_T_HASH_ID                  P5                             USABLE\r\nIND_T_HASH_ID                  P6                             UNUSABLE\r\nIND_T_HASH_ID                  P7                             UNUSABLE\r\nIND_T_HASH_ID                  P1                             UNUSABLE\r\nIND_T_HASH_ID                  P2                             UNUSABLE\r\nIND_T_HASH_ID                  P3                             UNUSABLE\r\nIND_T_HASH_ID                  P4                             USABLE\r\nIND_T_HASH_ID                  P8                             USABLE\r\n8 rows selected.<\/pre>\n<p>\u4e8b\u5b9e\u4e0a\uff0c\u5bf9\u4e8eHASH\u5206\u533a\u7684ADD PARTITION\u64cd\u4f5c\uff0cOracle\u57fa\u672c\u4e0a\u8fd8\u662f\u79c9\u627f\u4e86\u6ca1\u6709\u6570\u636e\u53d8\u5316\u5c31\u4e0d\u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\u7684\u601d\u8def\u3002\u552f\u4e00\u7684\u5dee\u522b\u5728\u4e8e\uff0c\u5bf9\u4e8e\u6e90\u5206\u533a\u5305\u542b\u8bb0\u5f55\u7684\u60c5\u51b5\uff0cOracle\u5e76\u6ca1\u6709\u6700\u540e\u53bb\u9a8c\u8bc1\uff0c\u662f\u5426\u771f\u7684\u53d1\u751f\u4e86\u6570\u636e\u7684\u8fc1\u79fb\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u76f4\u8ba4\u4e3aOracle\u5bf9\u4e8e\u6240\u6709\u5206\u533a\u7684\u64cd\u4f5c\u90fd\u662f\u4e00\u6837\u7684\uff0c\u53ea\u6709\u6570\u636e\u7684\u6539\u53d8\u624d\u4f1a\u5bfc\u81f4\u5206\u533a\u72b6\u6001\u7684\u5931\u6548\uff0c\u6ca1\u60f3\u5230HASH\u5206\u533a\u7684\u5b9e\u73b0\u65b9\u5f0f\u5e76\u4e0d\u76f8\u540c\u3002 HASH\u5206\u533a\u8868\u589e\u52a0\u65b0\u7684\u5206\u533a\u7684\u4e00\u70b9\u7814\u7a76\uff1ahttp:\/\/yangtingkun.itpub.net\/post\/468\/195510 \u770b\u4e00\u4e2a\u8303\u56f4\u5206\u533aSPLIT\u7684\u4f8b\u5b50\uff1a SQL> CREATE TABLE T_PART 2 (ID NUMBER, NAME VARCHAR2(30)) 3 PARTITION BY RANGE (ID) 4 (PARTITION P1 VALUES LESS THAN (10), 5 PARTITION PMAX VALUES LESS THAN (MAXVALUE)); Table created. SQL> INSERT INTO T_PART 2 SELECT ROWNUM, &hellip; <a href=\"https:\/\/yangtingkun.net\/?p=967\">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":[828,827,460,346],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2yiY3-fB","_links":{"self":[{"href":"https:\/\/yangtingkun.net\/index.php?rest_route=\/wp\/v2\/posts\/967"}],"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=967"}],"version-history":[{"count":1,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=\/wp\/v2\/posts\/967\/revisions"}],"predecessor-version":[{"id":968,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=\/wp\/v2\/posts\/967\/revisions\/968"}],"wp:attachment":[{"href":"https:\/\/yangtingkun.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=967"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=967"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=967"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}