{"id":1056,"date":"2017-05-14T11:52:51","date_gmt":"2017-05-14T03:52:51","guid":{"rendered":"http:\/\/www.821121.com\/?p=1056"},"modified":"2020-12-14T11:53:04","modified_gmt":"2020-12-14T03:53:04","slug":"%e7%ad%89%e5%be%85%e4%ba%8b%e4%bb%b6%ef%bc%9aenq-hw-contention","status":"publish","type":"post","link":"http:\/\/www.821121.com\/?p=1056","title":{"rendered":"\u7b49\u5f85\u4e8b\u4ef6\uff1aenq: HW – contention"},"content":{"rendered":"

\u63a5\u5230\u5ba2\u6237\u53cd\u9988\u7cfb\u7edf\u6574\u4f53\u8fd0\u884c\u7f13\u6162\uff0c\u67e5\u770bawr\uff0c\u53d1\u73b0enq: HW - contention\u5728\u7b49\u5f85\u4e8b\u4ef6\u4e2d\u6392top1.
\n\"file\"
\nmos\u6587\u6863740075.1\u4e2d\u6709\u8be6\u7ec6\u7684\u4ecb\u7ecd\u3002
\nenq: HW - contention\u5b57\u9762\u4e0a\u770b\u6bd4\u8f83\u5bb9\u6613\u7406\u89e3\uff0c\u5c31\u662f\u9ad8\u6c34\u4f4d\u7684\u4e89\u7528\u3002segment\u505a\u81ea\u52a8\u6269\u5c55\u65f6\u9700\u8981\u5360\u7528HW\u9501\uff0c\u5982\u679c\u81ea\u52a8\u6269\u5c55\u6bd4\u8f83\u9891\u7e41\uff0c\u5c31\u4f1a\u5bfc\u81f4HW\u9501\u7684\u4e89\u7528\u3002\u7279\u522b\u662fLOB CLOB\u5b57\u6bb5\u3002
\n\u89e3\u51b3\u65b9\u6cd5\u5c31\u662f\u51cf\u5c11\u81ea\u52a8\u6269\u5c55\u7684\u6b21\u6570\uff0c\u90a3\u5c31\u662f\u8981\u63d0\u5347\u6bcf\u6b21\u81ea\u52a8\u6269\u5c55\u7684\u7a7a\u95f4\u503c\uff0c\u5177\u4f53\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n

1\u3001\u901a\u8fc7ASH\u67e5\u770b\u5bf9\u5e94\u4f1a\u8bddP2\u3001P3\u7684\u503c\uff0c\u5e26\u5165\u4ee5\u4e0b\u8bed\u53e5\uff0c\u67e5\u770b\u662f\u54ea\u4e2a\u5757\u7684\u4e89\u7528\u5bfc\u81f4\u7684<\/p>\n

select DBMS_UTILITY.DATA_BLOCK_ADDRESS_FILE(<p3value>) FILE#,\nDBMS_UTILITY.DATA_BLOCK_ADDRESS_BLOCK(<p3value>) BLOCK#\nfrom dual;<\/code><\/pre>\n
2\u3001\u67e5\u8be2\u5904\u7406\u7684FILE#\u3001BLOCK#\u5e26\u5165\u4ee5\u4e0b\u8bed\u53e5\u67e5\u8be2\u662f\u54ea\u4e2asegment\u7684<\/p>\n
select owner, segment_type, segment_name\nfrom dba_extents\nwhere file_id = <FILE#>\nand <BLOCK#> between block_id and block_id + blocks - 1 and tablespace_name = (select name from ts$ where ts#= <P2value>); <\/code><\/pre>\n
3\u3001\u901a\u8fc7\u4ee5\u4e0b\u8bed\u53e5\uff0c\u63d0\u9ad8\u81ea\u52a8\u6269\u5c55\u7684\u503c<\/p>\n
ALTER TABLE <lob_table> MODIFY LOB (<column_name>) (allocate extent (size <extent size>));<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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