Case 1: 如果第63位是1, 那么是未提交的txn timestamp txn的timestamp在未提交的时候是txn_id(txn_id的第63位永远是1) 在提交后,txn的timestamp是commit_ts Case 2: 如果第63位是0,那么是已经提交的txncommit_ts 很显然,undo_log.ts只能是已经提交的txn. 而tuple_meta.ts则可以是Case 1 & Case 2. ...
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