An XID uniquely identifies the transaction and is made up of three parts: a format identifier, a transaction qualifier, and a branch qualifier.
xid惟一地标识事务，它由三部分构成：格式标识符、事务界定符和分支界定符。
An XID uniquely identifies the transaction and is made up of three parts: a format identifier, a transaction qualifier, and a branch qualifier.
xid惟一地标识事务，它由三部分构成：格式标识符、事务界定符和分支界定符。
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