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[DBMS] MySQLÀÇ ¹é¾÷ ¹× º¹±¸
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Link1 http://www.4te.co.kr/532 (145)
¿äÁòÀº MySQL Replication ±â´ÉÀ» ÀÌ¿ëÇØ¼­ DB SystemÀ» ±¸ÃàÇÏ´Â °æ¿ì°¡ ¸¹´Ù. ¶ÇÇÑ MySQL DB¸¦ »ç¿ëÇϸ鼭 ¹é¾÷Àº º¸Åë Replication Slave ´Ü¿¡ ÀÖ´Â ¹é¾÷ Server¿¡¼­ º°µµ·Î ¹Þ°Ô µÈ´Ù.
¹é¾÷ ¼­¹ö¿¡¼­ Dump·Î ¹Þ°Ô µÈ Data´Â DML Äõ¸®·Î µÈ text dataÀ̸ç, ÀÌ µ¥ÀÌÅ͸¦ ÀÌ¿ëÇØ¼­ ½Å±Ô Àåºñ¸¦ ¼³Ä¡ÇÏ´ø°¡, ¾Æ´Ï¸é ±âÁ¸ Àåºñ¿¡ ¹®Á¦°¡ »ý°åÀ» ½Ã º¹±¸¸¦ ÇÏ°Ô µÈ´Ù.


±×·±µ¥ º¹±¸¸¦ ÇÏ´õ¶óµµ ReplicationÀ̶õ ¹®Á¦·Î ÀÎÇØ Master DB¿Í ½ÌÅ©¸¦ ¸ÂÃß´Â ¹®Á¦°¡ ¹ß»ýÇÏ°Ô µÈ´Ù.
µû¶ó¼­ ¹é¾÷ ¼­¹ö¿¡¼­ ¹é¾÷À» ¹Þ°Ô µÇ´Â °æ¿ì, Master DBÀÇ binary logÀÇ Æ÷Áö¼ÇÀ» ¾Ë¾Æ¾ßÁö¸¸ µÈ´Ù.
ÀÌ·² °æ¿ì¿¡´Â ´ÙÀ½°ú °°Àº ÀýÂ÷¸¦ µû¶ó¼­ Dump¸¦ ¹ÞÀ¸¸é µÈ´Ù.

/usr/local/mysql/bin/mysqldump -uroot -p --master-data=2  > /data/¡¦/backup.sql

ÀÌ ¸í·É¾î Áß¿¡¼­ "--master-data=2" ¿É¼ÇÀ» ÁÖ°Ô µÇ¸é ´ýÇÁ ½ÃÁ¡ÀÇ binary logÀÇ Æ÷Áö¼Ç Á¤º¸°¡ °°ÀÌ Dump µÇ°Ô µÈ´Ù.
DumpµÈ ÆÄÀÏÀ» ¿¡µðÅÍ·Î ¿­¾îº¸¸é ´ÙÀ½°ú °°Àº ³»¿ëÀÌ ³ª¿Â´Ù.

CHANGE MASTER TO MASTER_LOG_FILE='binaryÆÄÀÏ', MASTER_LOG_POS=Æ÷Áö¼Ç¹øÈ£;

À§ ¸»Àº binaryÆÄÀÏÀÇ Æ÷Áö¼Ç ¹øÈ£ ½ÃÁ¡¿¡¼­ ¹éÀÔÀÌ ÀÌ·ç¾î Á³´Ù´Â ÀǹÌÀÌ´Ù.
¹°·Ð binary ÆÄÀϰú Æ÷Áö¼ÇÀº º¹±¸Çϱâ À§ÇÑ Áß¿äÇÑ ³»¿ëÀÌ µÇ°ÚÁö¸¸, À§¿Í °°Àº ±¸¼º¿¡¼­ º¹±¸¸¦ Çϱâ À§Çؼ­´Â Á¶±Ý ¾Ö¸Å º¸È£ÇÑ °¨ÀÌ ÀÖ´Ù.
°¡·É, Backup DB¿¡¼­ Dump¹ÞÀº ÆÄÀÏÀ» Slave DB¸¦ º¹±¸Çϱâ À§ÇØ »ç¿ëÇÑ´Ù´ø°¡, ¾Æ´Ï¸é ½Å±Ô Slave Àåºñ°¡ ¿Í¼­ »õ·Î¿î ½Ã½ºÅÛÀ» ±¸ÃàÇÒ ½Ã¿¡´Â Backup DBÀÇ binary ÆÄÀϸí°ú Æ÷Áö¼ÇÀº º°·Î ¼Ò¿ëÀÌ ¾ø±â ¶§¹®ÀÌ´Ù.
µû¶ó¼­ ÀÌ·² ¶§¿¡´Â ´ÙÀ½°ú °°Àº ÀýÂ÷·Î Master DBÀÇ binary ÆÄÀϰú Æ÷Áö¼ÇÀ» ¾Ë¾Æ³¾ ¼ö ÀÖ´Ù.

1. Backup DB¿¡¼­ Æ÷Áö¼ÇÀÌ ¼ÓÇÑ ¹ÙÀ̳ʸ® ·Î±×¸¦ sql ÆÄÀÏ·Î export ÇÑ´Ù. »ç¿ë ÅøÀº mysqlbinlogÀÌ´Ù.

/usr/local/mysql/bin/mysqlbinlog --start-datetime="2008-12-15 02:00:00" --stop-datetime='2008-12-15 02:30:00' /data/mysql_data/binaryÆÄÀÏ > binlog.sql

2. Master DB¿¡¼­µµ À§ ¹æ¹ý´ë·Î ¹ÙÀ̳ʸ® ·Î±×¸¦ sql ÆÄÀÏ·Î export ÇÑ´Ù.

/usr/local/mysql/bin/mysqlbinlog --start-datetime="2008-12-15 02:00:00" --stop-datetime='2008-12-15 02:30:00' /data/mysql_data/binaryÆÄÀÏ > binlog.sql

3. Backup DB¿¡¼­ exportÇÑ sql ÆÄÀÏÀ» ¿¡µðÅÍ·Î ¿­¾î¼­ È®ÀÎÇØ º»´Ù.

# at 576856551
#060824  2:18:30 server id 1  log_pos 576856551     Intvar
SET INSERT_ID=136;
# at 576856579
#060824  2:18:30 server id 1  log_pos 576856579     Query   thread_id=16587969  exec_time=16157 error_code=0
SET TIMESTAMP=1156353510;

...

# at 576856919

ÃÖÃÊ¿¡ Backup DB¿¡¼­ Dump¹ÞÀº ÆÄÀÏ¿¡ ±â·ÏµÈ Æ÷Áö¼Ç Á¤º¸¸¦ ã´Â´Ù.

4. Master DB¿¡¼­ export ÇÑ sql ÆÄÀÏÀ» ¿¡µðÅÍ·Î ¿­¾î¼­ µ¿ÀÏÇÑ Æ÷Áö¼ÇÀ» ã´Â´Ù.

# at 576375776
#060824  2:18:30 server id 1  log_pos 576375776         Intvar
SET INSERT_ID=136;
# at 576375804
#060824  2:18:30 server id 1  log_pos 576375804         Query   thread_id=16587969      exec_time=0     error_code=0
SET TIMESTAMP=1156353510;


Backup DB¿¡¼­ ÇØ´ç Æ÷Áö¼Ç¿¡ ±â·ÏµÈ TIMESTAMP°ª°ú µ¿ÀÏÇÑ Á¤º¸¸¦ Master DB¿¡¼­ exportÇÑ sql ÆÄÀÏ¿¡¼­ ã´Â´Ù.
À§ÀÇ °æ¿ì¿¡´Â 576375776ÀÌ Æ÷Áö¼Ç ¹øÈ£°¡ µÈ´Ù.

5. ÃÖÃÊ¿¡ Dump ¹ÞÀº Dump DataÀÇ ¹ÙÀ̳ʸ® ÆÄÀϰú Æ÷Áö¼ÇÀ» ¼öÁ¤ÇØ ÁØ´Ù.

CHANGE MASTER TO MASTER_LOG_FILE='¸¶½ºÅÍDBÀÇ binaryÆÄÀÏ', MASTER_LOG_POS=576375776;

À§¿Í °°ÀÌ µÇ¾ú´Ù¸é, Dump ¹ÞÀº ÆÄÀÏÀº ¾ðÁ¦¶óµµ Master DB¿¡ ºÙ¿©¼­ replicationÀ» µ¿±âÈ­ ½Ãų ¼ö ÀÖ´Â Áغñ°¡ µÈ »óÅÂÀÌ´Ù.
¸¸ÀÏ »õ·Î¿î Àåºñ¸¦ µé¿©¿Í¼­ Dump Data·Î º¹±¸¸¦ Çß´Ù¸é, À§ ¸í·É¾î¸¦ ³»¸° ÈÄ slave¸¦ start ½Ã۸é, Master DBÀÇ ÇØ´ç Æ÷Áö¼Ç ºÎÅÍ sync¸¦ ¸ÂÃç°¡±â ½ÃÀÛÇÑ´Ù.
Master DBÀÇ Æ÷Áö¼ÇÀ» ¸ðµÎ ´Ù µû¶ó°¬´Ù°í ÆÇ´ÜµÇ¸é Slave DB¸¦ ¼­ºñ½º¿¡ ÅõÀÔ½ÃŰ¸é ³¡ÀÌ´Ù.




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