{"id":599,"date":"2017-01-25T18:18:30","date_gmt":"2017-01-25T10:18:30","guid":{"rendered":"http:\/\/www.rao-bing.cn\/?p=599"},"modified":"2020-01-06T16:13:32","modified_gmt":"2020-01-06T08:13:32","slug":"12c-hcc-row-level-locking","status":"publish","type":"post","link":"http:\/\/www.rao-bing.cn\/index.php\/2017\/01\/25\/599\/","title":{"rendered":"12c \u6df7\u5408\u5217\u538b\u7f29\u884c\u7ea7\u9501"},"content":{"rendered":"

\u6211\u4eec\u77e5\u9053\uff0c\u572811g\u65f6\uff0c\u6df7\u5408\u5217\u538b\u7f29\uff08HCC\uff09\u7684\u8868\u4e0a\u8fdb\u884cDML\u65f6\uff0c\u662f\u4f1a\u9501\u4f4f\u6574\u4e2a\u538b\u7f29\u5355\u5143\u7684\uff08CU\uff0ccompression unit\uff09\uff0c\u8fd9\u6837\u5c31\u964d\u4f4e\u4e86\u5e76\u53d1\u6027\u3002<\/p>\n

Oracle\u572812cR1\u63a8\u51fa\u4e86\u6df7\u5408\u5217\u538b\u7f29\u7684\u884c\u7ea7\u9501\u673a\u5236\uff0c\u572812cR1\u4e4b\u540e\uff0c\u5728\u5b9a\u4e49\u4f7f\u7528HCC\u7684\u8868\u65f6\uff0c\u53ef\u4ee5\u6307\u5b9a\u5728\u505aDML\u65f6\uff0c\u4f7f\u7528\u884c\u7ea7\u9501\uff0c\u7f3a\u7701\u8fd8\u662f\u9501\u6574\u4e2aCU\u3002<\/p>\n

 <\/p>\n

\u5b9e\u9a8c:<\/p>\n

\u9996\u5148\u6d4b\u8bd5\u6ca1\u6709\u884c\u7ea7\u9501\u7684\u60c5\u51b5\uff1a<\/p>\n

SQL> create table test1(col1,col2) compress for query high as select rownum,rownum*10 from dual connect by rownum <= 100;<\/p>\n

\u56e0\u4e3a\u6211\u4eec\u77e5\u9053\u4e00\u4e2aCU\u4e00\u822c\u572832K\u5230256K\u4e4b\u95f4\uff0c\u6240\u4ee5\u8fd9\u6837\u7684\u6570\u636e\u91cf\u5e94\u8be5\u5728\u4e00\u4e2aCU\u91cc\u9762\u3002<\/p>\n

 <\/p>\n

\u5728\u4e00\u4e2a\u4f1a\u8bdd\u79cd\uff0c\u6267\u884c\uff1a<\/p>\n

SQL> update test1 set col2=col2+1 where col1=100;<\/p>\n

\u5df2\u66f4\u65b0 1 \u884c\u3002<\/p>\n

SQL> select * from v$mystat where rownum < 2;<\/p>\n

SID STATISTIC#\u00a0\u00a0\u00a0\u00a0\u00a0 VALUE\u00a0\u00a0\u00a0\u00a0 CON_ID
\n———- ———- ———- ———-
\n761\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 41<\/p>\n

SQL><\/p>\n

 <\/p>\n

\u6211\u4eec\u73b0\u5728\u77e5\u9053\u8fd9\u4e2a\u4f1a\u8bdd\u7684ID\u662f761<\/p>\n

 <\/p>\n

\u5728\u53e6\u4e00\u4e2a\u4f1a\u8bdd\u4e2d\uff0c\u6211\u4eec\u5c1d\u8bd5\u66f4\u65b0\u53e6\u4e00\u6761\u8bb0\u5f55\uff1a<\/p>\n

SQL> select * from v$mystat where rownum < 2;<\/p>\n

SID STATISTIC#\u00a0\u00a0\u00a0\u00a0\u00a0 VALUE\u00a0\u00a0\u00a0\u00a0 CON_ID
\n———- ———- ———- ———-
\n638\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 41<\/p>\n

SQL> update test1 set col2=col2+1 where col1=99;<\/p>\n

 <\/p>\n

\u4f1a\u8bddhang\u4f4f\uff0c\u7b49\u5f85\u53d6\u5f97\u9501<\/p>\n

\u67e5\u770bV$LOCK\u89c6\u56fe\uff1a<\/p>\n

 <\/p>\n

SQL> select * from v$lock where con_id = 41;<\/p>\n

ADDR\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 KADDR\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 SID TYPE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ID1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ID2
\n—————- —————- ———- —- ———- ———-
\nLMODE\u00a0\u00a0\u00a0 REQUEST\u00a0\u00a0\u00a0\u00a0\u00a0 CTIME\u00a0\u00a0\u00a0\u00a0\u00a0 BLOCK\u00a0\u00a0\u00a0\u00a0 CON_ID
\n———- ———- ———- ———- ———-
\n00007F0DFB06F2C0 00007F0DFB06F330\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 638 TM\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 70854\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0
\n3\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 138\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 41<\/p>\n

00007F0DFB06F2C0 00007F0DFB06F330\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 761 TM\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 70854\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0
\n3\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 199\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 41<\/p>\n

0000000CA1B5D258 0000000CA1B5D2D8\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 638<\/span> TX\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 196639\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 985
\n0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 6<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 138\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 41
\nADDR\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 KADDR\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 SID TYPE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ID1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ID2
\n—————- —————- ———- —- ———- ———-
\nLMODE\u00a0\u00a0\u00a0 REQUEST\u00a0\u00a0\u00a0\u00a0\u00a0 CTIME\u00a0\u00a0\u00a0\u00a0\u00a0 BLOCK\u00a0\u00a0\u00a0\u00a0 CON_ID
\n———- ———- ———- ———- ———-
\n0000000C30BECFB8 0000000C30BED040\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 761<\/span> TX\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 196639\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 985
\n6 <\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 199\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 41<\/p>\n

0000000CA1B38E08 0000000CA1B38E88\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 506 TS\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 3\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1
\n3\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0 2269603\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 41<\/p>\n

 <\/p>\n

\u4ece\u89c6\u56fe\u4e2d\u5f88\u5bb9\u6613\u770b\u5230\uff0c761\u4f1a\u8bdd\u6301\u6709\u72ec\u5360TX\u9501\uff086\uff09\uff0c\u800c638\u8bf7\u6c42TX\u72ec\u5360\u9501\uff086\uff09\uff0c\u6240\u4ee5\u8bc1\u660e\u666e\u901a\u6a21\u5f0fHCC\u8868\u66f4\u65b0\u65f6\uff0c\u662f\u9501\u6574\u4e2aCU\u7684\u3002<\/p>\n

 <\/p>\n

\u5982\u679c\u4f7f\u7528\u4e0b\u9762\u7684\u8bed\u53e5\u521b\u5efa\u8868\uff0c\u5c31\u542f\u7528\u4e86ROW LEVEL LOCKING<\/p>\n

SQL> create table test1(col1,col2) compress for query high row level locking<\/span> as select rownum,rownum*10 from dual connect by rownum <= 100;<\/p>\n

 <\/p>\n

\u6211\u4eec\u8fd8\u662f\u50cf\u4e0a\u4e2a\u5b9e\u9a8c\u4e2d\u505a\u7684\u4e00\u6837\uff0c\u5728\u4e24\u4e2a\u4f1a\u8bdd\u4e2d\u5206\u522b\u66f4\u65b0\u4e0d\u540c\u7684\u8bb0\u5f55\uff0c\u5c31\u90fd\u80fd\u66f4\u65b0\u6210\u529f\uff0c\u6ca1\u6709\u9501\u7b49\u5f85\u4e86\u3002<\/p>\n

\u67e5\u8be2V$LOCK\u67e5\u770b\u9501\u60c5\u51b5\uff1a<\/p>\n

SQL> select * from v$lock where con_id = 41;<\/p>\n

ADDR\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 KADDR\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 SID TYPE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ID1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ID2\u00a0\u00a0\u00a0\u00a0\u00a0 LMODE\u00a0\u00a0\u00a0 REQUEST\u00a0\u00a0\u00a0\u00a0\u00a0 CTIME\u00a0\u00a0\u00a0\u00a0\u00a0 BLOCK\u00a0\u00a0\u00a0\u00a0 CON_ID
\n—————- —————- ———- —- ———- ———- ———- ———- ———- ———- ———-
\n0000000C30BEDB90 0000000C30BEDC18\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 761<\/span> TX\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 131075\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 962\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 6<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 17\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 41
\n0000000C308B1EE8 0000000C308B1F70\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 638<\/span> TX\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 393224\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 522\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 6<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 6\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 41
\n00007F0DFB0702F8 00007F0DFB070368\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 638 TM\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 70856\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 3\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 6\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 41
\n00007F0DFB0702F8 00007F0DFB070368\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 761 TM\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 70856\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 3\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 17\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 41
\n0000000CA1B38E08 0000000CA1B38E88\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 506 TS\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 3\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 3\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0 2270761\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 41<\/p>\n

\u53ef\u4ee5\u770b\u5230\uff0c761\u548c638\u4e24\u4e2a\u4f1a\u8bdd\u90fd\u6301\u6709TX\u72ec\u5360\u9501\uff086\uff09\u3002<\/p>\n

 <\/p>\n

\u5f53\u7136\uff0c\u6211\u4eec\u77e5\u9053\u66f4\u65b0\u540e\u5c31\u4f1a\u89e3\u538b\u7f29\u8bb0\u5f55\uff0c\u8fd9\u6837\u7684\u529f\u80fd\u5b9e\u9645\u4ef7\u503c\u4e0d\u5927\uff0c\u4f46\u662f\u6211\u4eec\u80fd\u770b\u5230\uff0cOracle\u7684HCC\u5728\u4e00\u70b9\u4e00\u70b9\u5730\u589e\u5f3a\uff0c\u5e0c\u671b\u6700\u540eHCC\u8868\u80fd\u591f\u50cf\u666e\u901a\u8868\u4e00\u6837\u64cd\u4f5c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u6211\u4eec\u77e5\u9053\uff0c\u572811g\u65f6\uff0c\u6df7\u5408\u5217\u538b\u7f29\uff08HCC\uff09\u7684\u8868\u4e0a\u8fdb\u884cDML\u65f6\uff0c\u662f\u4f1a\u9501\u4f4f\u6574\u4e2a\u538b\u7f29\u5355\u5143\u7684\uff08CU\uff0ccompression unit\uff09\uff0c\u8fd9\u6837\u5c31\u964d\u4f4e\u4e86\u5e76\u53d1\u6027\u3002 Oracl…<\/p>\n

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