Èñ¸Á³ª¶ó (¹ÚÀçÈñ)
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carno´Â Áߺ¹µÇÁö ¾ÊÀ¸¹Ç·Î
carnoÀÇ À妽º¸¸ »ç¿ëÇصµ ¹®Á¦¾øÀ»µí ÇÕ´Ï´Ù.
company, workman Àº Áߺ¹ÀԷµɼö ÀÖÀ¸¹Ç·Î À妽º·Î¼´Â °¡Ä¡°¡ ¾÷¾îº¸ÀÔ´Ï´Ù.Á¤ ÇÊ¿äÇÏ´Ù¸é º¹ÇÕÀε¥½ºÀ» »ç¿ë.
Âü°í¸¸ Çϼ¼¿ä.
2017-10-13 ¿ÀÈÄ 5:50:32
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¸¶À½ÀÌ (ÇÑÈñ¼÷)
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°¨»çÇÕ´Ï´Ù. ÇÑ°¡Áö ´õ ¿©Âá°Ô¿ä.
Â÷·®¿îÇà³»¿ª Å×À̺íÀÔ´Ï´Ù.
carno |company |workman
-------------------------
77°¡1234 | ȸ»ç1 |È«±æµ¿
77°¡1234 | ȸ»ç1 |ÀÓ²©Á¤
77°¡1234 | ȸ»ç2 |È«±æµ¿
55¶ó7777 | ȸ»ç3 |ÀÓ²©Á¤
55¶ó7777 | ȸ»ç4 |ÀÌ»óÇØ
A: index(carno), index(company), index(workman)
B: index(carno,company,workman)
À§ÀÇ A,B µÎ°¡Áö·Î À妽º ÁÖ¸é ¾î¶³±î¿ä?
workman Çϳª¸¸ °Ë»öÇϰųª
company Çϳª¸¸ °Ë»öÇϱ⵵ Çؼ¿ä.
Çϳª¸¸ °Ë»öÇÒ °æ¿ì¿¡´Â A¹æ½ÄÀÇ À妽º¸¦ Ÿ°ÔÇÏ°í
2°¡Áö ÀÌ»óÀÇ Çʵå·Î °Ë»ö½Ã¿¡´Â BŸÀÔÀ¸·Î °Ë»öµÇ°Ô²û¿ä.
firebird 2.1À» »ç¿ëÇÏ°í Àִµ¥¿ä, À§Ã³·³ À妽º ¼³Á¤ÇßÀ»¶§
¿ÉƼ¸¶ÀÌÁ®°¡ ¾Ë¾Æ¼ ó¸®ÇÏ°Ú´ÂÁö¿ä?
2017-10-14 ¿ÀÀü 11:34:11
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Èñ¸Á³ª¶ó (¹ÚÀçÈñ)
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¸ÕÀú Å×À̺íÀ» ¾î¶»°Ô °ü¸®ÇÏ´À³Ä°¡ ´õ Áß¿äÇÒ°Í °°½À´Ï´Ù.
Â÷·®°ü¸®Å×À̺í
create table Car(
iNo int identity not null CONSTRAINT PK_iNo PRIMARY KEY NonClustered
,Carno varchar(10)
)
sp_help Car
create table Carrent(
iNo int identity --Carno¿¡ ´ëÇÑ ino
,serial int Not null -- Carno¿¡ ´ëÇÑ ino °¡ ´ë¿©µÈ ¼ø¼
,company varchar(10) null
,workman varchar(10) null
)
Create NonClustered INDEX IX_iNoserial ON Carrent (iNo,serial) --NonClustered »öÀÎ »ý¼º
select Cr.* from Carrent Cr inner join Car Ca
on Cr.iNo = Ca.iNo
where Ca.Carno ='12345'
Å×½ºÆ®´Â Çغ¸Áö ¾Ê¾Æ¼ ¼º´ÉÀº ¸ð¸£°Ú³×¿ä. 2017-10-14 ¿ÀÈÄ 4:59:46
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¸¶À½ÀÌ (ÇÑÈñ¼÷)
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Èñ¸Á³ª¶ó´Ô, Á¤±Ôȸ¦ °í·ÁÇÏÁö ¸øÇѵ¥¿¡
ÀÚ¼¼ÇÑ ¼³¸í °¨»çÇÕ´Ï´Ù.
firebird 2.1 À» »ç¿ëÁß¿¡ Àִµ¥¿ä,
Á¶°ÇÀý(where~)ÀÌ ¾Æ·¡Ã³·³ ¿©·¯ °æ¿ì°¡ ÀÖ½À´Ï´Ù.
where carno='xx' order by carno
where company='xx' order by company
where workman='xx' order by workman
where carno='xx' and company='xx' order by carno,company
where carno='xx' and company='xx' and workman='xx' order by carno,workman
À§ÀÇ È¿À²ÀûÀΠ󸮸¦ À§ÇÑ À妽º¸¦
index(carno)
index(company)
index(workman)
index(carno,company)
index(carno,company,workman)
ó·³ ÁÖ¾ú´Âµ¥
À妽º¼³Á¤À» ÀûÀýÈ÷ ÇØ ÁÖ¾ú´ÂÁö
ºÁÁֽðí, firebird¿¡¼µµ ¹®Á¦¾øÀÌ À§ À妽º°¡
Á¦´ë·Î µ¿ÀÛÇÏ´ÂÁö ¿©Â庸°í ½Í¾î¿ä~ 2017-10-16 ¿ÀÀü 10:32:37
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¹ø°³ (¼Å¿í)
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carno°¡ Çʼö¶ó¸é carno¸¸ À妽º ¼³Á¤Çϼ¼¿ä
carno°¡ Çʼö°¡ ¾Æ´Ï¶ó¸é Ç׸ñº°·Î °¢°¢ À妽º ¼³Á¤Çϼ¼¿ä 2017-10-16 ¿ÀÈÄ 6:20:20
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¼º´È£ (¼º´È£)
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FireBird ¶ÇÇÑ º¸ÆíÀûÀÎ RDBMS ¿Í ºñ½ÁÇÏ´Ù´Â ÀüÁ¦ÇÏ¿¡,
index(carno) -> »èÁ¦
index(company)
index(workman)
index(carno,company) -> »èÁ¦
index(carno,company,workman)
Çϼŵµ µÇ°Ú½À´Ï´Ù. 2017-10-16 ¿ÀÈÄ 9:24:35
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¸¶À½ÀÌ (ÇÑÈñ¼÷)
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°¨»çÇÕ´Ï´Ù.
¸¶Áö¸·À¸·Î ÇÑ°¡Áö¸¸..
º¹ÇÕÀ妽º¸¦ index(carno,company,workman)
·Î ¼³Á¤ÇÏ´õ¶óµµ, ¾Æ·¡Ã³·³ whereÀý óÀ½¿¡ sDate¸¦ Ãß°¡ÇÑ´Ù¸é ´ç¿¬È÷ ¾Æ·¡ Äõ¸®´Â À妽º¸¦ ŸÁö ¾Ê°ÚÁö¿ä?
where sDate > 2017-10-17 and carno='xx' and company='xx' and workman='xx' order by carno,workman 2017-10-17 ¿ÀÈÄ 6:46:54
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³ªµµÇѶ§´Â (ÀÌÁßö)
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¾Æ´Ï¿ä ¸Å¿ì Àß Å¾´Ï´Ù. 2017-10-18 ¿ÀÀü 10:44:38
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¸¶À½ÀÌ (ÇÑÈñ¼÷)
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°¨»çÇÕ´Ï´Ù.ÀÌÁßö´Ô. ±Ùµ¥ Á¶±Ý Çê°¥¸®³×¿ä.
º¸ÆíÀûÀÎ RDBMS ¿¡¼¿ä..
[ù¹ø°Áú¹®]
Ä®·³ a, b, c, d, e
À妽º¸¦ idx1(a), idx2(b), idx3(c), idx4(d), idx5(e) °¢°¢ ÁÖ¾úÀ»¶§
WHERE a = 1 and b = 2 and c = 3 and d = 4 and e = 5
À§ Äõ¸®¿¡¼ ù¹ø° idx1(Áï a=1)¸¸ À妽º Ÿ´Â°ÍÀÌ ¾Æ´ÑÁö¿ä?
[µÎ¹ø°Áú¹®]
Ä®·³ a, b, c, d, e
À妽º¸¦ idx1(a), idx4(b,c,d,e) ·Î ÇßÀ»¶§
WHERE a = 1 and b = 2 and c = 3 and d = 4 and e = 5
À§ Äõ¸®¿¡¼ idx1, idx4 ¸ðµÎ À妽º Ÿ´Â°¡¿ä?(idx4´Â º¹ÇÕÀ妽º)
[¼¼¹ø°Áú¹®]
Ä®·³ a, b, c, d, e
À妽º¸¦ idx4(b,c,d,e) ·Î ÇßÀ»¶§ (a´Â À妽º ¼³Á¤¾ÈÇÔ)
WHERE a = 1 and b = 2 and c = 3 and d = 4 and e = 5
À§ Äõ¸®¿¡¼ idx4 °¡ À妽º Ÿ´Â°¡¿ä?(idx4´Â º¹ÇÕÀ妽º) 2017-10-18 ¿ÀÈÄ 5:07:10
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³ªµµÇѶ§´Â (ÀÌÁßö)
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[ù¹ø°Áú¹®]
Å×À̺í Ç®½ºÄµ ¹× 5°³Áß¿¡¼ Åë°è°ªÀÌ °¡Àå ÁÁÀº°ÍÀ» ¼±ÅÃÇÕ´Ï´Ù.
[µÎ¹ø°Áú¹®]
Å×À̺í Ç®½ºÄµ ¹× 2°³Áß¿¡¼ Åë°è°ªÀÌ °¡Àå ÁÁÀº°ÍÀ» ¼±ÅÃÇÕ´Ï´Ù.
[¼¼¹ø°Áú¹®]
Å×À̺í Ç®½ºÄµ ¹× 1°³Áß¿¡¼ Åë°è°ªÀÌ °¡Àå ÁÁÀº°ÍÀ» ¼±ÅÃÇÕ´Ï´Ù.
Áï DB ¿£ÁøÀÌ ÆÇ´ÜÇϱ⸦ °¡Àå ÄÚ½ºÆ®°¡ ÀûÀº °ÍÀÌ ¹«¾ùÀÎÁö ÆÇ´ÜÇؼ ¼öÇàµË´Ï´Ù.
µÎ¹ø°Áú¹®À» ¿¹·Î µç´Ù¸é ¸¸¾à a Ä÷³ÀÌ ÇØ´ç Å×ÀÌºí¿¡ À¯´ÏÅ©ÇÑ KEY °ªÀ̶ó¸é ´ëºÎºÐ idx4¸¦ ŸÁö ¾ÊÀ¸¸ç idx1¸¦ Ÿ°Ô µË´Ï´Ù.
±×°ÍÀÌ ÄÚ½ºÆ®°¡ Àû°Ô µç´Ù°í DB ¿£ÁøÀÌ ÆÇ´ÜÇϱ⠶§¹®ÀÔ´Ï´Ù. 2017-10-18 ¿ÀÈÄ 6:07:10
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¸¶À½ÀÌ (ÇÑÈñ¼÷)
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ÀÌÁßö´Ô ÀÚ¼¼ÇÑ ´äº¯ °¨»çÇÕ´Ï´Ù.
firebird 2.1.4µµ »ç¿ëÇØ º¸¼Ì´ÂÁö¿ä?
À§ÀÇ ±ÔÄ¢À» µû¸£°ÚÁö¿ä?
firebird ¹®¼¸¦ »ìÆ캸¾Ò´Âµ¥¿ä,
¿µ¹®Çؼ®ÀÌ Á¦°¡ ºÎÁ·Çؼ º¸ÆíÀûÀÎ RDBMS¿Í
ºñ½ÁÇÑ °Í °°Àºµ¥... ±×·¡µµ ¸íÈ®ÇÏ°Ô
¾Ë ÇÊ¿ä°¡ ÀÖÀ»µí ½Í¾î¼¿ä..
IBExpert·Î Å×½ºÆ®Çغ¸·Á´Âµ¥ À妽ºÅ¸´ÂÁö
È®ÀÎÇÏ´Â ±â´ÉÀº »ó¿ë¿¡¸¸ Àֳ׿ä¤Ð 2017-10-18 ¿ÀÈÄ 7:17:26
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³ªµµÇѶ§´Â (ÀÌÁßö)
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¸¶À½ÀÌ (ÇÑÈñ¼÷)
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³Ê¹« °¨»çÇÕ´Ï´Ù.
»çÀÌÆ® ÂüÁ¶Çؼ °øºÎÇغ¸°Ú½À´Ï´Ù. 2017-10-19 ¿ÀÈÄ 12:27:20
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¼º´È£ (¼º´È£)
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¿äÁò µ¨¸¶´ç¿¡¼ º¸±â Èûµç ÈÆÈÆÇÑ ¸ð½ÀÀ̳×À¯ ¤§¤§¤§ 2017-10-19 ¿ÀÈÄ 11:46:52
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