DB Tips

kenu
2004-09-01 09:45:24
[oracle]Å×À̺í Á¤º¸

select 'analyze table ' || tname || ' compute statistics;'
  from tab
 where tname not like 'TEMP%'
   and tname not like 'ITB%'

-- after analyze table

select table_name, num_rows, last_analyzed, avg_row_len from tabs;

Tag
tag´Â °Ô½Ã¹°ÀÇ ¼º°ÝÀ» ³ªÅ¸³»´Â Ű¿öµå¸¦ ÀÔ·ÂÇÏ´Â °ø°£ÀÔ´Ï´Ù.
tag´Â ·Î±×ÀÎ ÈÄ »ç¿ëÇÏ½Ç ¼ö ÀÖ½À´Ï´Ù.
  • analyze ´Â ¼±ÅÃÀº ÃßÈÄ Áö¼ÓÀûÀÎ analyze ¸¦ ÇÒ°ÍÀ̰í,
    Ãß°¡ÀûÀ¸·Î Áö¼ÓÀûÀÎ tuning ÀÛ¾÷À» ÇÏ¼Å¾ß ÇÕ´Ï´Ù.
    ´ë°³ ¿À¶óŬ ¼³Ä¡½Ã µðÆúÆ® ¸ðµå·Î...optimizer ¸¦ choose ¸ðµåÀ̰í,
    À̸»Àº Åë°è(statistics)Á¤º¸°¡ ÀÖ´Ù¸é, cbo(cost based optimizer) ¸ðµå·Î
    ¾ø´Ù¸é rbo(rule based optimizer) ¸ðµå·Î ¿î¿µ µÈ´Ù´Â ÀǹÌÀ̰í,
    ¼³Ä¡ ÀÌÈÄ Çѹøµµ analyze ¸¦ ÇÏÁö ¾ÊÀº µðºñ¿¡ ´ëÇØ¼­ ¾î´À³¯ °©ÀÚ±â
    analyze ¸¦ ½ÇÇà Çϸé, ±âÁ¸ÀÇ rbo base ¿¡¼­ Àß µÇ´ø app °¡ cbo base Àß ¾ÈµÉ °¡´É¼ºÀ»
    ³»Æ÷ Çϰí ÀÖ½À´Ï´Ù.
    analyze ½ÇÇà ÈÄ ¹Ýµå½Ã monitoring À» ÇÏ¼Å¾ß ÇÒ°Ì´Ï´Ù.
  • darkturtle
  • 2005-12-22 08:52:18
  • x
´ÙÀ½±Û mysql utf8 ¼³Á¤
>> 258 [oracle]Å×À̺í Á¤º¸  [1] kenu 5533 2004-09-01 09:45:24
ÀÌÀü±Û ½ÇÇà °èȹ(explan plan ) ȯ°æ ¼³Á¤¹× º¸±â