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Current Result Document :
ÇѱÛÁ¦¸ñ(Korean Title) |
Çã»ó Æ®·£Àè¼Ç : ÆÛÁö °Ë»çÁ¡¿¡ µû¸¥ ȸº¹ÀÇ ¹®Á¦Á¡ |
¿µ¹®Á¦¸ñ(English Title) |
Dangling Transactions : Wormholes of Recovery Owing to Fuzzy Checkpoint |
ÀúÀÚ(Author) |
¹Ú¿µÃ¶
¹ÚÁØÇö
±èÁØ
ÀÌÁø¼ö
Young Chul Park
Jun Hyun Park
June Kim
Jin Soo Lee
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¿ø¹®¼ö·Ïó(Citation) |
VOL 25 NO. 03 PP. 0426 ~ 0443 (1998. 03) |
Çѱ۳»¿ë (Korean Abstract) |
ARIES´Â µ¥ÀÌŸº£À̽º °ü¸®½Ã½ºÅÛÀ» À§ÇÑ °£´ÜÇϸ鼵µ Æ÷°ýÀûÀΠȸº¹ ±â¹ýÀ¸·Î ¹Þ¾Æµé¿©Áö°í ÀÖ´Ù. ARIES´Â Àç½ÃÀÛ È¸º¹°ú ¸Åü ȸº¹À» ¼öÇàÇÒ ¶§ÀÇ ÀÛ¾÷·®À» ÁÙÀ̱â À§ÇÏ¿© ½Ã½ºÅÛÀÇ Á¤»ó¿îÇൿ¾È ÁÖ±âÀûÀ¸·Î °Ë»çÁ¡À» ¼öÇàÇÑ´Ù. ƯÈ÷, Á¤»óÀûÀÎ Æ®·£Àè¼ÇÀÇ ¼öÇà°ú´Â ºñµ¿±âÀûÀ¸·Î °Ë»çÁ¡À» ¼öÇàÇÏ´Â ÆÛÁö °Ë»çÁ¡À» Áö¿øÇÑ´Ù. ARlES´Â ÆÛÁö °Ë»çÁ¡ÀÇ Æ®·£Àè¼Ç Å×ÀÌºí °Ë»ç ÀÛ¾÷°ú ÀÏ¹Ý Æ®·£Àè¼ÇµéÀÇ Æ®·£Àè¼ÇÁ¾·á ·Î±× ·¹ÄÚµå ±â·Ï°ú °ü·ÃµÈ Æ®·£Àè¼Ç Å×À̺íÀÇ º¯°æ ÀÛ¾÷½Ã¿¡ Æ®·£Àè¼Ç Å×À̺íÀÇ ·¡Ã븦 ȹµæÇÏ°í ÇØÁ¦ÇÏ´Â ¹æ¹ý¿¡ ´ëÇØ ÀÚ¼¼È÷ ±â¼úÇÏÁö ¾Ê°í ÀÖÀ¸¸ç ÀÌ¿¡ ´ëÇÑ ¹æ¹ý¿¡ µû¶ó Çã»ó Æ®·£Àè¼Ç(dangling transactions)ÀÌ ¹ß»ýÇÒ °¡´É¼ºÀÌ ÀÖ´Ù. Çã»ó Æ®·£Àè¼ÇÀ̶õ Æ®·£Àè¼ÇÀÇ Æ®·£Àè¼ÇÁ¾·á ·Î±× ·¹Äڵ尡 ±× Æ®·£Àè¼ÇÀÇ ¼öÇà »óŸ¦ ±â·ÏÇÑ °Ë»çÁ¡ÀÇ °Ë»çÁ¡Á¾·á ·Î±× ·¹Äڵ庸´Ù ¾Õ¼¼ ±â·ÏµÈ Æ®·£Àè¼ÇÀ» ÀǹÌÇÑ´Ù. º» ³í¹®Àº Çã»ó Æ®·£Àè¼ÇÀÌ ¹ß»ýÇÒ ¼ö ÀÖ´Â »óȲÀ» ºÐ¼®ÇÏ°í À̸¦ ¹ÙÅÁÀ¸·Î Çã»ó Æ®·£Àè¼ÇÀ» ¹æÁöÇÏ´Â ¹æ¹ý°ú Çã»ó Æ®·£Àè¼ÇÀÇ ¹ß»ýÀ» Çã¿ëÇÏÁö¸¸ ȸº¹½Ã¿¡ À̸¦ °ËÃâÇÏ¿© Á¾·áÇÑ Æ®·£Àè¼ÇÀ¸·Î ó¸®ÇÏ´Â ¹æ¹ýÀ» Á¦½ÃÇÑ´Ù.
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¿µ¹®³»¿ë (English Abstract) |
ARIES has been recognized as a simple and comprehensive recovery scheme for database management systems. To minimize the amount of work that needs to be done during the restart recovery and media recovery, ARIES performs checkpoints periodically while the system is under normal forward processing. Especially, fuzzy checkpoint is supported lo take checkpoints asynchronously with operations of normal transactions. ARIES does not give detailed description about holding and releasing latches of transaction table for checking the transaction table by fuzzy checkpoint and those for updating the transaction table owing to logging end records by normal transactions. However, depending on the design scheme of holding and releasing transaction latches, there is a possibility of dangling transactions. Dangling transactions are transactions whose end records precede an end_chkpt record that contains states of the transactions on its transaction list. In this paper, we analyze the cases where dangling transactions can be occurred. Based on the analysis, we propose two different schemes: one that prevents occurrences of dangling transactions and the other that permits occurrences of dangling transactions but detects and treats them as terminated transactions during recovery process.
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