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Outer table cost = 2517 Inner table cost = 631 Hash join cost = 3149 = 2517 + 631 + 1 The extra one is the Hash join one ptn (partition) cost. HA Join Outer table: resc: 2517 cdn: 68 rcz: 27 deg: 1 resp: 2517 Inner table: PARENT Alias: P resc: 631 cdn: 110 rcz: 27 deg: 1 resp: 631 using join:8 distribution:2 #groups:1 Hash join one ptn Resc: 1 Deg: 1 hash_area: 124 (max=2560) buildfrag: 1 probefrag: 1 ppasses: 1 Hash join Resc: 3149 Resp: 3149 We have now tried all three (four) join mechanisms, with the following best costs in each case: NL SM HA 2586 3151 3149
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So we report the cost of the cheapest option, and remember that as the cost of producing the intermediate data set. Join result: cost: 2586 cdn: 1 rcz: 54
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The optimizer only ever joins two tables so it s time to join the next table in the current join order to our intermediate data set. The Outer table isn t really a table, of course. Now joining: GRANDPARENT[GP]#2 ******* NL Join Outer table: cost: 2586 cdn: 1 rcz: 54 resp: 2586 Inner table: GRANDPARENT Alias: GP Access Path: table-scan Resc: 128 Join: Resc: 2714 Resp: 2714 Access Path: index (unique) Index: GP_PK rsc_cpu: 15589 rsc_io: 1 ix_sel: 5.0000e-004 ix_sel_with_filters: 5.0000e-004 NL Join: resc: 2587 resp: 2587 Access Path: index (eq-unique) Index: GP_PK rsc_cpu: 15789 rsc_io: 1 ix_sel: 0.0000e+000 ix_sel_with_filters: 0.0000e+000 NL Join: resc: 2587 resp: 2587 Best NL cost: 2587 resp: 2587 Using concatenated index cardinality for table GRANDPARENT
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Revised join selectivity: 5.0000e-004 = 8.3417e-005 * (1/2000) * (1/8.3417e-005) Join Card: 0.04 = outer (0.75) * inner (110.25) * sel (5.0000e-004) SM Join Outer table: resc: 2586 cdn: 1 rcz: 54 deg: 1 resp: 2586 Inner table: GRANDPARENT Alias: GP resc: 128 cdn: 110 rcz: 23 deg: 1 resp: 128 using join:1 distribution:2 #groups:1 SORT resource Sort statistics Sort width: 58 Area size: 208896 Max Area size: Degree: 1 Blocks to Sort: 1 Row size: 70 Total Rows: Initial runs: 1 Merge passes: 0 IO Cost / pass: Total IO sort cost: 0 Total CPU sort cost: 5000000 Total Temp space used: 0 SORT resource Sort statistics Sort width: 58 Area size: 208896 Max Area size: Degree: 1 Blocks to Sort: 1 Row size: 36 Total Rows: Initial runs: 1 Merge passes: 0 IO Cost / pass: Total IO sort cost: 0 Total CPU sort cost: 5033608 Total Temp space used: 0 Merge join Cost: 2716 Resp: 2716 HA Join Outer table: resc: 2586 cdn: 1 rcz: 54 deg: 1 resp: 2586 Inner table: GRANDPARENT Alias: GP resc: 128 cdn: 110 rcz: 23 deg: 1 resp: 128 using join:8 distribution:2 #groups:1 Hash join one ptn Resc: 1 Deg: 1 hash_area: 124 (max=2560) buildfrag: 1 probefrag: 1 ppasses: 1 Hash join Resc: 2714 Resp: 2714 Join result: cost: 2587 cdn: 1 rcz: 77
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We ve added the third table to the list, so now we add the fourth table to the intermediate result. Notice that the cost of the Outer table is now the cost of the join of the previous three tables. Now joining: GREATGRANDPARENT[GGP]#3 ******* NL Join Outer table: cost: 2587 cdn: 1 rcz: 77 resp: Inner table: GREATGRANDPARENT Alias: GGP Access Path: table-scan Resc: 64 Join: Resc: 2651 Resp: 2651
CHAPTER 14 THE 10053 TRACE FILE
Access Path: index (unique) Index: GGP_PK rsc_cpu: 15558 rsc_io: 1 ix_sel: 1.0000e-003 ix_sel_with_filters: 1.0000e-003 NL Join: resc: 2588 resp: 2588 Access Path: index (eq-unique) Index: GGP_PK rsc_cpu: 15758 rsc_io: 1 ix_sel: 0.0000e+000 ix_sel_with_filters: 0.0000e+000 NL Join: resc: 2588 resp: 2588 Best NL cost: 2588 resp: 2588 Join Card: 0.04 = outer (0.04) * inner (261.26) * sel (3.8168e-003) SM Join Outer table: resc: 2587 cdn: 1 rcz: 77 deg: 1 resp: 2587 Inner table: GREATGRANDPARENT Alias: GGP resc: 64 cdn: 261 rcz: 19 deg: 1 resp: 64 using join:1 distribution:2 #groups:1 SORT resource Sort statistics Sort width: 58 Area size: 208896 Max Area size: Degree: 1 Blocks to Sort: 1 Row size: 95 Total Rows: Initial runs: 1 Merge passes: 0 IO Cost / pass: Total IO sort cost: 0 Total CPU sort cost: 5000000 Total Temp space used: 0 SORT resource Sort statistics Sort width: 58 Area size: 208896 Max Area size: Degree: 1 Blocks to Sort: 1 Row size: 31 Total Rows: Initial runs: 1 Merge passes: 0 IO Cost / pass: Total IO sort cost: 0 Total CPU sort cost: 5094402 Total Temp space used: 0 Merge join Cost: 2653 Resp: 2653 HA Join Outer table: resc: 2587 cdn: 1 rcz: 77 deg: 1 resp: 2587 Inner table: GREATGRANDPARENT Alias: GGP resc: 64 cdn: 261 rcz: 19 deg: 1 resp: 64 using join:8 distribution:2 #groups:1 Hash join one ptn Resc: 1 Deg: 1 hash_area: 124 (max=2560) buildfrag: 1 probefrag: 1 ppasses: 1 Hash join Resc: 2652 Resp: 2652 Join result: cost: 2588 cdn: 1 rcz: 96
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