enq: TX,enqtx

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enq: TX,enqtx

enq: TX - row lock contention等待事件的三個參數如下

 * P1 = name|mode          <<<<<<< name一般都為0x5458代表TX鎖; mode為4代表共用鎖定 mode為6代表獨佔鎖定
 * P2 = usn<<16 | slot      <<<<<<< v$transaction.xidusn  和 v$transaction.xidslot

 * P3 = sequence             <<<<<<< v$transaction. xidseq 不難發現P2和P3其實就是 XID的組成部分

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道行尚淺,歡迎拍磚。

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