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¼º´É Çâ»óÀ» À§ÇÑ Æ®·£½ºÆ÷¸ÓÀÇ ÀçÀÛ¼º Àü·«¡ºTHE LOGICAL OPTIMIZER¡». Logical Optimizer´Â ¼º´É Çâ»óÀÇ ¸ñÀûÀ¸·Î SQLÀ» ÀçÀÛ¼ºÇϴ åÀ¸·Î, ¿ÉƼ¸¶ÀÌÁ®°¡ SQLÀ» Á÷Á¢ º¯°æ ÇÔÀ¸·Î½á SQLÀÇ ¼º´É¿¡ ¹ÌÄ¡´Â ¿µÇâÀº ´Ù·ç°í ÀÖ´Ù. Logical OptimizerÀÇ ÇÑ°è·Î ÀÎÇØ ¹ß»ýÇÏ´Â ¼º´É ¹®Á¦¸¦ ÇØ°áÇÏ´Â ¹æ¹ýÀ» Á¦½ÃÇÑ´Ù.
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Logical Optimizer´Â ¼º´É Çâ»óÀÇ ¸ñÀûÀ¸·Î SQLÀ» ÀçÀÛ¼º(º¯°æ)ÇÕ´Ï´Ù. ÇÏÁö¸¸ ¿ÉƼ¸¶ÀÌÁ®°¡ ¿Ïº®ÇÏÁö ¸øÇϹǷΠ¸¹Àº °æ¿ì¿¡ ¼º´ÉÀúÇϸ¦ ÀÏÀ¸Å°°Ô µË´Ï´Ù. ¿ÉƼ¸¶ÀÌÁ®°¡ SQLÀ» Á÷Á¢ º¯°æ ÇÔÀ¸·Î½á SQLÀÇ ¼º´É¿¡ ¹ÌÄ¡´Â ¿µÇâÀº Áö´ëÇÏÁö¸¸ Àü¼¼°èÀûÀ¸·Î ÀÌ°ÍÀ» Àü¹ÝÀûÀ¸·Î ´Ù·é ¼ÀûÀÌ ¾ø´Ù´Â Á¡°ú Logical OptimizerÀÇ ÇÑ°è·Î ÀÎÇØ ¹ß»ýÇÏ´Â ¼º´É ¹®Á¦¸¦ ÇØ°áÇϱâ À§ÇØ º»¼°¡ Ãâ°£µÇ¾ú½À´Ï´Ù.
º»¹®ÀÇ ³»¿ëÀ» ÀÍÈ÷¸é ´ÙÀ½°ú °°Àº ´É·ÂÀ» °¡Áö°Ô µÉ °ÍÀÔ´Ï´Ù.
ÀÌ Ã¥À» ÅëÇÏ¿© ¾òÀ» ¼ö ÀÖ´Â °Í
1. ¼º´ÉÇâ»óÀ» À§ÇÑ SQL ¼öÁ¤À» Æ©³Ê°¡ ¾Æ´Ñ ¿ÉƼ¸¶ÀÌÁ®¿¡°Ô ½ÃÅ°´Â ¹æ¹ý
2. º¯°æµÈ ½ÇÇà°èȹÀ» Á¤È®È÷ Àо´Â ´É·Â
3. SQL°ú Plan¸¸ º¸°í ¿ÉƼ¸¶ÀÌÁ®°¡ SQLÀ» ¾î¶»°Ô º¯°æ½ÃÄ×´ÂÁö ¾Ë ¼ö ÀÖ´Â ´É·Â
4. Æ©´×¿¡ ½ÇÆÐÇß´ø SQLÀ» Æ©´×ÇÒ ¼ö ÀÖ´Â ´É·Â
±Ã±ØÀûÀ¸·Î´Â ¿ÉƼ¸¶ÀÌÁ®¸¦ ÀÚÀ¯ÀÚÀç·Î Control ÇÒ ¼ö ÀÖ´Â ´É·Â
ÀÌ Ã¥ÀÇ ³À̵µ´Â Áß±Þ ¹× °í±ÞÀÔ´Ï´Ù. µû¶ó¼ ´ÙÀ½°ú °°Àº ºÐµé¿¡°Ô Àϵ¶À» ±ÇÇÕ´Ï´Ù.
ÀÌ Ã¥À» Àоî¾ß ÇÒ »ç¶÷
1. ¿À¶óŬÀ» »ç¿ëÇÏ´Â DBA, Áß±Þ ¹× °í±Þ °³¹ßÀÚ, DBMSÀÇ ¼º´É¿¡ °ü½ÉÀÌ ÀÖ´Â ¸ðµ¨·¯³ª ¼³°èÀÚ, Æ©³Ê, DBMS ÄÁ¼³ÅÏÆ®, Data Architect
2. Oracle ÀÌ¿ÜÀÇ DBMS¸¦ »ç¿ëÇÏ´Â DBA¶ó¸é OracleÀÇ SQL Transformation ±â´É°ú Ÿ DBMSÀÇ SQL Transformation ±â´ÉÀ» ºñ±³Çغ¼ ¼ö ÀÖ´Â ±âȸ°¡ µÉ °ÍÀÔ´Ï´Ù.
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Part 1 - Query Transformation Concept
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1.1 Logical Optimizer(Transformer)¶õ ¹«¾ùÀΰ¡
1.2 Query TransformationÀ» ¾Ë¾Æ¾ß ÇÏ´Â ÀÌÀ¯
1.3 Query TransformationÀÇ °³³ä
1.4 Query TransformerÀÇ ±¸Á¶
1.5 DBMS_XPLAN.DISPLAY_CURSOR
1.6 ³»°¡ »ç¿ëÇÑ Hint°¡ ¹«½ÃµÇ´Â ÀÌÀ¯
1.7 10053 Event Trace
Part 2 - Heuristic Query Transformation
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2.A Heuristic Query TransformationÀ̶õ?
2.1
CSE (Common Subexpression Elimination): Where Àý¿¡¼ or »ç¿ë½Ã ÁßøµÈ Á¶°ÇÀýÀº Á¦°ÅÇ϶ó
2.2 JE(Join Elimination) : Á÷Á¢ »ç¿ëÇÏÁö ¾Ê´Â Å×À̺íÀº SQL¿¡¼ »èÁ¦Ç϶ó
2.3 OE (Outer Join Table Elimination) : ºÒÇÊ¿äÇÑ OuterÂÊ Å×À̺íÀº »èÁ¦Ç϶ó
2.4 OJE(Outer-Join Elimination) : ÀÇ¹Ì ¾ø´Â Outer Á¶ÀÎÀ» Inner Á¶ÀÎÀ¸·Î ¹Ù²Ù¾î¶ó
2.5 OBYE(Order By Elimination) : ºÒÇÊ¿äÇÑ Order By¸¦ »èÁ¦Ç϶ó
2.6 DE (Distinct Elimination) : ºÒÇÊ¿äÇÑ Distinct¸¦ Á¦°ÅÇ϶ó
2.7
CNT(Count(column) To Count(*)):Count(Ä÷³) »ç¿ë½Ã ÇØ´ç Ä÷³ÀÌ Not NullÀÎ °æ¿ì Count(*)·Î ´ëüÇ϶ó
2.8 FPD (Filter Push Down) : Á¶°ÇÀýÀ» ÀζóÀÎºä ³»ºÎ·Î À̵¿½ÃÄѶó
2.9 TP* (Transitive Predicate) : Á¶ÀÎÀýÀ» ÀÌ¿ëÇÏ¿© ´Ù¸¥ Å×ÀÌºí¿¡ »ó¼öÁ¶°ÇÀ» »ý¼º½ÃÄѶó
2.10 SVM (Simple View Merging) : Simple View¸¦ ÇØüÇÏ¿© ¸ÞÀÎ Äõ¸®¿Í ÅëÇÕÇ϶ó
2.11 LV*(Lateral View) : ºä¸¦ Scalar ¼ºêÄõ¸®Ã³·³ »ç¿ëÇ϶ó
2.12 FOJC* (Full Outer Join Conversion) : Full Outer Á¶ÀÎÀ» Union All·Î º¯°æÇ϶ó
2.13 NFOJ* (Native Full Outer Join) : Full Outer Á¶Àνà Áߺ¹ ScanµÇ´Â Å×À̺íÀ» Á¦°ÅÇ϶ó
2.14 OT* (Operator Transformation) : ƯÁ¤ ¿¬»êÀÚ¸¦ ´Ù¸¥ ¿¬»êÀÚ·Î º¯È¯Ç϶ó
2.15 PM(Predicate Move Around): Where Á¶°ÇÀ» ´Ù¸¥ ºä¿¡ À̵¿½ÃÄѶó
2.16
WCOTR* (Where Current Of To Rowid) : Where Current Of ¸¦ »ç¿ëÇÏ¿© Index ScanÀ» ȸÇÇÇ϶ó
Heuristic Query Transformation for Subquery
2.17 SSU(Simple Subquery Unnesting) : ´Ü¼ø ¼ºêÄõ¸®¸¦ Á¶ÀÎÀ¸·Î ¹Ù²Ù¾î¶ó
2.18
CRSW (Correlated Removal Subquery Using Window Function): »ó°ü ¼ºêÄõ¸®¸¦ »ç¿ëÇÒ ¶§ ºÐ¼®ÇÔ¼ö¸¦ »ç¿ëÇÒ ¼ö ÀÖ´Â °æ¿ì ¼ºêÄõ¸®¸¦ Á¦°ÅÇ϶ó
2.19
URSW (Uncorrelated Removal Subquery Using Window Function): ºÐ¼®ÇÔ¼ö¸¦ »ç¿ëÇÒ ¼ö ÀÖ´Â °æ¿ì ºñ»ó°ü ¼ºêÄõ¸®¸¦ Á¦°ÅÇ϶ó
2.20 SJ (Semi Join) : ¼ºêÄõ¸®¸¦ Semi Á¶ÀÎÀ¸·Î º¯È¯Ç϶ó
2.21 AJ (Anti Join) : ºÎÁ¤Çü ¼ºêÄõ¸®¸¦ Anti Á¶ÀÎÀ¸·Î ¹Ù²Ù¾î¶ó
2.22
ANTI NA(Anti Join Null Aware) : Null Çã¿ë Ä÷³À¸·Î ¼ºêÄõ¸®¿Í Á¶Àνà Anti Á¶ÀÎÀÌ °¡´ÉÇÏ´Ù
2.23 OJTAJ*(Outer Join to Anti Join) : Outer Á¶ÀÎÀ» Anti Á¶ÀÎÀ¸·Î º¯È¯Ç϶ó
2.24
EJE*(Enhanced JE): Semi / Anti Á¶Àΰú ANSI Style·Î Á¶ÀÎ ÇÒ °æ¿ìµµ JE°¡ °¡´ÉÇÏ´Ù
2.25 JESJ*(Join Elimination Using Self Join): Self Join »ç¿ë½Ã¿¡µµ JE°¡ °¡´ÉÇÏ´Ù
2.26 SSTS*(Scalar Subquery To Subquery): ½ºÄ®¶ó ¼ºêÄõ¸®¸¦ ¼ºêÄõ¸®·Î º¯È¯Ç϶ó
2.27 SQC (Subquery Coalescing): ºÒÇÊ¿äÇÏ°Ô ºÐ¸®µÇ¾î ÀÖ´Â ¼ºêÄõ¸®¸¦ Çϳª·Î ÅëÇÕÇ϶ó
2.28
DSJ (Driving Semi Join): Semi JoinÀ» Bitmap À妽º¸¦ ÀÌ¿ëÇÏ¿© Driving Å×À̺í·Î ¹Ù²Ù¾î¶ó
2.29
SJR*, AJR*(Hash Join Right Semi/Anti) : Hash Semi/Anti Join ½Ã »ç¿ëµÇ´Â ¼ºêÄõ¸® ÁýÇÕÀ» Build Input ÁýÇÕÀ¸·Î º¯È¯Ç϶ó
Heuristic Query Transformation for Data Warehouse
2.30 PC* (Pivot Conversion) : Pivot ÀýÀ» Case + Group By·Î º¯È¯Ç϶ó
2.31 GBEP* (Group By Extension Pruning) : ºÒÇÊ¿äÇÑ Rollup À̳ª CUBE¸¦ »èÁ¦Ç϶ó
2.32
GSTT* (Grouping Sets Using Temp Table): Grouping Sets »ç¿ë½Ã Temp Å×ÀÌºí¿¡ ÀûÀçÈÄ À̸¦ ¹Ýº¹Çؼ ÀÌ¿ëÇ϶ó
2.33 GSTU* (Grouping Sets To UNION): Grouping Sets¸¦ UNION ALL·Î º¯È¯Ç϶ó
2.34 GSTR*(Grouping Sets To Rollup): Grouping SetsÀ» RollupÀ¸·Î º¯È¯Ç϶ó
2.B Part 2¸¦ ¸¶¹«¸® Çϸç
Part 3 - Cost Based Query Transformation
µé¾î°¡±â
3.A Cost Based Query TransformationÀ̶õ ¹«¾ùÀΰ¡
3.B Search Type°ú IterationÀ̶õ ¹«¾ùÀΰ¡
3.1 CBPPD*(Cost Based Predicate Push Down) : Complex View¿¡ Filter¸¦ ¹Ð¾î ³Ö¾î¶ó
3.2 PPU(Predicate Pull Up) : ºñ¿ëÀÌ ¸¹ÀÌ µå´Â Á¶°ÇÀýÀ» ºä ¿ÜºÎ·Î À̵¿½ÃÄѶó
3.3
OR-Expansion(OR To Union All Conversion) : OR Á¶°ÇÀ» ÀÌ¿ëÇÏ¿©Union All·Î º¯°æ½ÃÄѶó
3.4
OR-Expansion Using Function*(NVL, DECODE, RANK To Union All): NVL, DECODE, RANK ÇÔ¼ö¸¦ »ç¿ëÇÑ Á¶°ÇÀýÀ» ÀÌ¿ëÇÏ¿© Union All·Î º¯°æÇ϶ó
3.5
TE (Table Expansion): ¿©·¯ °³ÀÇ ÆÄƼ¼ÇÀ» ¾×¼¼½º ÇÒ ¶§ ÆÄƼ¼Ç ¸¶´Ù Union All·Î ºÐ¸®Çؼ Index scanÀ» ÇÒÁö FTS¸¦ ÇÒÁö ÆÇ´ÜÇ϶ó
3.6 SJC (Set To Join Conversion) : ÁýÇÕ¿¬»êÀ» Á¶ÀÎÀ¸·Î ¹Ù²Ù¾î¶ó
3.7 CSU (Complex Subquery Unnesting) : º¹ÀâÇÑ ¼ºêÄõ¸®¸¦ Á¶ÀÎÀ¸·Î ¹Ù²Ù¾î¶ó
3.8 CVM( Complex View Merging ) : Distinct³ª Group By°¡ ÀÖ´Â ºä¸¦ ÇØüÇ϶ó
3.9 JPPD Union View: UnionÀ» »ç¿ëÇÑ ºä¿¡ Á¶ÀÎ Á¶°ÇÀ» ħÅõ½ÃÄѶó
3.10 JPPD Union All View: Union AllÀ» »ç¿ëÇÑ ºä¿¡ Á¶ÀÎ Á¶°ÇÀ» ħÅõ½ÃÄѶó
3.11 JPPD Outer Join View: ºä¿¡ Outer Á¶ÀÎÀ» »ç¿ëÇÑ °æ¿ì Á¶ÀÎ Á¶°ÇÀ» ħÅõ ½ÃÄѶó
3.12
Multi Level JPPD: ºä ³»ºÎ¿¡ ¶Ç ´Ù¸¥ ºä°¡ ÀÖ´õ¶óµµ ¸ÞÀÎ Äõ¸®ÀÇ Á¶ÀÎ Á¶°ÇÀ» ħÅõ ½ÃÄѶó
3.13
JPPD Extension: Distinct ³ª Group By, Semi/Anti-joinÀ» »ç¿ëÇÑ ºä¿¡ Á¶ÀÎ Á¶°ÇÀ» ħÅõ½ÃÄѶó
3.14 GBP (Group By Placement) : Group By¸¦ ¸ÕÀú ¼öÇàÇÏ°í Join Ç϶ó
3.15 GBPD (Group By Push Down) : Parallel Query ¼öÇà ½Ã Group by¸¦ Çѹø ´õ ¼öÇàÇ϶ó
3.16
JF(Join Factorization) : Union / Union All »ç¿ë½Ã °øÅëÀ¸·Î »ç¿ëÇÏ´Â Å×À̺íÀ» ºÐ¸®½ÃÄѶó
3.17
ST ( Star Transformation ): From ÀýÀÇ Dimension Å×À̺íÀ» ¼ºêÄõ¸®·Î º¯È¯ÇÏ°í DSJ ±â´ÉÀ» ÀÌ¿ëÇÏ¿© Bitmap ¿¬»êÀ» ¼öÇàÇ϶ó
3.18
CBST (Cost Based Star Transformation): Star Transformation Àû¿ë½Ã Cost Based ȯ°æÀ» ÀÌ¿ëÇ϶ó
3.19
MVR(Materialized View Rewrite): Materialized View¸¦ »ç¿ëÇÏÁö ¾Ê´Â SQLÀ» Materialized View¸¦ »ç¿ëÇÏ´Â SQL·Î ¹Ù²Ù¾î¶ó
3.20
JBE (Join Back Elimination) : Bitmap Join Index¸¦ »ç¿ëÇÒ °æ¿ì ÇÊ¿ä ¾ø´Â Å×ÀÌºí ¾×¼¼½º¸¦ Á¦°ÅÇ϶ó
3.C Part 3À» ¸¶¹«¸® Çϸç
Part 4 - Cost Based Query Transformation Internal
µé¾î°¡±â
4.1 Search TypeÀÇ °³³ä°ú Á¾·ù
4.2 Search Type ºÐ¼®¿¡ »ç¿ëµÉ SQL
4.3 Exhaustive Type Àü·«
4.4 Iterative Type Àü·«
4.5 Linear Type Àü·«
4.6 Two_Pass Type Àü·«
4.7 Off Option Àü·«
4.8 On Option Àü·«
4.9 State Space¶õ ¹«¾ùÀΰ¡
4.10 CA*(Cost Annotation)¶õ ¹«¾ùÀΰ¡
4.11 ¸Þ¸ð¸® °ü¸®
4.12 Interleaving: ¼± º¯È¯ °úÁ¤ÀÌ ³¡³ª¸é ÈÄ º¯È¯ °úÁ¤À» ¿¬ÀÌ¾î ¼öÇàÇ϶ó
4.13 Juxtaposition: ¹èŸÀûÀÎ º¯È¯À» µ¿½Ã¿¡ °í·ÁÇÏ¿© Cost°¡ ³·Àº °ÍÀ» ¼±ÅÃÇ϶ó
4.14 ½Ç¹«¿¡ Àû¿ëÇϱâ
4.A Part 4¸¦ ¸¶¹«¸® Çϸç
ºÎ·Ï°ú »öÀÎ
½Ç¹«¿¡¼ÀÇ Query Transformation À̽´
¹ÌÇØ°á °úÁ¦
Epilogue
Bibliography
Index
º»¹®Áß¿¡¼
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