133 lines
2.0 KiB
Plaintext
133 lines
2.0 KiB
Plaintext
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We use the LINEITEM relation from the TPC-H benchmark at scale factor 0.1
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lORDERKEY : 1
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lPARTKEY : 15519
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lSUPPKEY : 785
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lLINENUMBER : 1
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lQUANTITY : 17
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lEXTENDEDPRICE : 24386.67
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lDISCOUNT : 0.04
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lTAX : 0.02
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lRETURNFLAG : N
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lLINESTATUS : O
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lSHIPDATE : 1996-03-13
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lCOMMITDATE : 1996-02-12
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lRECEIPTDATE : 1996-03-22
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lSHIPINSTRUCT : DELIVER IN PERSON
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lSHIPMODE : TRUCK
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lCOMMENT : blithely regular ideas caj
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query LINEITEM feedproject[lORDERKEY, lPARTKEY, lSUPPKEY, lLINENUMBER,
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lQUANTITY, lEXTENDEDPRICE, lDISCOUNT, lTAX, lRETURNFLAG, lLINESTATUS,
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lSHIPDATE] count
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13.86, 13.66, 13.61 sec
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Estimate 16.76
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query LINEITEM feedproject[lORDERKEY] count
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2.95, 2.96, 2.95
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Estimate 5.95
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Time difference is 13.66 - 2.96 = 10.7
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Time per attribute is 10700 / (10 * 600572) ms = 0.0018
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let LINEITEMFirstAttr = LINEITEM feedproject[lORDERKEY] consume
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query LINEITEMFirstAttr feedproject[lORDERKEY] count
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2.32, 2.32, 2.32
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Estimate 2.39
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let LINEITEM10 = LINEITEM feed ten feed product remove[no] consume
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let LINEITEMFirstAttr10 = LINEITEMFirstAttr feed ten feed product
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remove[no] consume
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query LINEITEM10 feedproject[lORDERKEY] count
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57.22, 60.26, 58.39
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Estimate 59.5
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Tuplesize is 169.8
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query LINEITEMFirstAttr10 feedproject[lORDERKEY] count
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25.70, 22.70, 22.88
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Estimate is 23.9
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Tuplesize is 5
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Time difference is 58.5 - 22.8 = 35.7
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Difference in number of bytes is 164.8 * 6005720
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Time per byte is 35700 / (164.8 * 6005720) = 0.036 mikrosecs
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= 0.000036 ms per byte
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For this query:
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query LINEITEMFirstAttr10 feedproject[lORDERKEY] count
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total time for bytes is 6005720 * 0.000036 = 0.216 sec
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total time for attrs is 6005720 * 1 * 0.0018 = 10.81 sec
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Remaining time is 22.8 - 11 = 11.8 sec
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is 11800 / 6005720 = 0.002 ms per tuple
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Estimates for small relations are a bit too large because time
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per byte is measured for reading large relations from disk (not buffered).
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