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×îºÃÉèÖÃÒ»¸ö±£´æµã£¬Àýsavepoint a,»òÕßÖ´ÐÐ exec dbms_transaction.savepoint('a')(Ö´ÐÐǰÐèÒªÖ´ÐÐset serveroutput onÓï¾ä)£»È¡Ïû²¿·ÖÊÂÎñ¾Í¿ÉÒÔʹÓÃrollback to a,»òÕßÖ´ÐÐexec dbms_transaction.rollback_savepoint('a');È¡ÏûÈ«²¿ÊÂÎñ¿ÉÒÔÖ´ÐÐrollback,»òÕßexec dbms_transaction.rollback;
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set transaction read only,»òÕßÖ´ÐÐexec dbms_transaction.read_only;ÕâʱºòÄãÔÙ½øÐвéѯ»Ø²éѯÄãÖ´ÐÐÕâÌõÓï¾äʱ¸Ã±íÖÐÊý¾ÝµÄÐÅÏ¢£¬ÆäËûÓû§ÐÞ¸ÄʱËäÈ»¸Ä±äÁ˱íÖеÄÊý¾Ýµ«ÊDz»»á±»Äã·¢ÏÖ¡£
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set transaction isolation level serializable;»ù±¾ÉÏÓë2ÌõÖ´ÐÐÒ»Ñù¡£
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