ãã®ãªã¼ãã¯å¿ ãã½ã¼ãããã¦ç¶æ ã§ç®¡çããã¦ãããããã«ããã¼ã¿ã®æ¿å ¥ãæ´æ°ã§ãªã¼ãåå²ã«ããã¤ã³ããã¯ã¹ã®ããã©ã¼ãã³ã¹å£åãçºçããããã§ããã¾ãããã®è§£æãããããããã«åä¸ãããã¯å ãããã¯è¿ãã®ãããã¯å ã«ã¯ç¬¬ä¸ãã¼ãåããã®ãããã¾ã£ã¦åå¨ãã¾ãããããããè¤åç´¢å¼ã®å ´åã¯ã第ä¸ãã¼ã®ã¿ã«ãã SELECT æã§ããå¹çããã¢ã¯ã»ã¹ãå¯è½ï¼ INDEX RANGE SCAN ï¼ã§ãéã«ç¬¬äºãã¼ã®ã¿ã«ãã SELECT æã§ã¯ãããã¤ãã®ãããã¯ãèªãï¼ INDEX SKIP SCAN ããã㯠TABE FULL SCAN ï¼å¿ è¦ãã§ã¦ããããã§ãã è¦ã¦ã®éããåä¸ãããã¯å ã®ç¬¬ä¸ãã¼ã®åä¸å¤ãã»ã¼å ¨ã¦ç¶²ç¾ ããã¦ãã¾ããOracle ã¯ãããã¯åä½ã§ I/O 管çããã¦ãããããä¸è¨ã®ä¾ã 㨠where ID=1 ã®ããã«ç¬¬ä¸ãã¼ã®ç価è©ä¾¡ã«ããçµãè¾¼ã¿ãè¡ãå ´åããããã¯ã
{{#tags}}- {{label}}
{{/tags}}