Aug 14, 2007
Hello,
The query included at the end of this post seems to use the 'wrong' index when executing and takes 2+ minutes to run. When I provide an index hint, it runs in under 1 second. This happens in both the Production and Development environments; both servers run SQL Server 2005 SP2.
When I run both the queries together in Query Analyzer (or SSMS), the Query Cost (relative to the batch) value for the query with the index hint = 83.24%.
Profiler stats for Original Query:
Duration = 130484 ms
CPU = 111141 ms
Reads = 85470
Profiler stats for Index Hint Query:
Duration = 64 ms
CPU = 687 ms
Reads = 5558
Statistics are updated every night (w/Fullscan)
Indexes are rebuilt/defragmented daily based on fragmentation levels.
What am I missing here/how do I fix this performance issue?
Doesn't Profiler take into account the "Subtree Cost" for the Index Seek (which Query Analyzer & SSMS consider to be so expensive)? What Events/Columns do I need to include in the Profiler trace to see this statistic when the query is executing?
Thanks much,
Smitha
------------------------------------------------------------------------
QUERY:
select min(AccessLevel)
from Groups-- WITH(INDEX = ByClassID)
where name = 'Student Leader'
and classid in (2067,2063,2069,2070,2079,2072,2073,2074,2075,2076,2077,2073,2079,2030,2039,2032,201,2034,2035,2036,2037,201,2039,2090,
202,2092,2093,2094,2095,2096,2097,2093,202,24,2909,2902,2903,2904,2905,25,2907,2903,2909,220,229,222,223,224,225,226,227,223,229,2920,2929,2922,2923,2924,22,2926,2927,2923,2929,2930,26,2932,291,2934,2935,28,2937,291,
26,2940,2949,211,2943,2944,2945,2946,2947,2943,2949,27,2959,2952,2953,2954,2955,2956,2957,2953,2959,2960,2969,2962,2963,2964,2965,2966,2967,2963,2969,2970,2979,2972,2973,2974,2975,2976,2977,2973,2979,2930,26,2932,291,2934,2935,28,
2937,291,26,220,229,222,223,224,225,226,227,223,229,2200,2209,2202,2203,2204,2205,34736,34739,34749,34742,34743,34744,34745,34746,34747,34743,34749,3471,34759,34392,34393,34396,34397,34962,34937,3491,346,3420,3429,3423,3424,35360,35695,35696,35709,
1056,1057,1223,4107,1256,1257,1259,1269,1262,1263,1265,1267,1263,1269,1270,1272,1273,1274,1275,1276,1277,1273,1279,1230,1239,1232,121,1234,1235,1236,1237,121,1290,122,1292,1293,1294,1295,1296,1293,122,1300,1309,1302,1303,1304,1305,1306,
1307,1494,1459,1469,1462,1466,1467,1469,1470,1472,1474,1475,1477,1432,141,1435,1436,1437,1439,1494,1496,1497,142,113,115,117,113,119,1590,152,1592,1593,1594,1595,1596,1593,152,1520,1529,1522,1523,1524,1525,1527,1539,151,1534,1536,
151,1540,1543,1544,1545,1547,1572,1573,1574,1576,1577,1573,1579,1539,53969,64763,67735,67736,63967,1529,1530,1532,151,1534,1535,1536,1537,151,1539,1540,1549,1542,1543,1545,1546,1547,1543,1549,151,1559,1553,1555,1557,1553,1559,1560,1569,1562,
1563,1564,1565,1566,1567,1563,1569,1570,1579,1572,1573,1574,1575,1576,1577,1573,1579,1530,1539,1532,151,1534,1535,1536,152,1609,1602,1603,1604,1605,1606,1607,1603,1609,1690,162,1692,1693,1694,1695,1696,1697,1693,162,1629,1622,1635,1637,
1640,1642,1646,1649,1652,1657,1669,1664,1667,1679,1634,1637,1693,1703,1706,172,1795,1793,1722,1726,1764,1392,1393,1394,1395,1396,132,1320,1329,1322,1323,3629,3622,3623,3624,3625,3626,3627,3623,3629,36200,36209,36202,36203,36204,36205,36206,36207,
36203,36209,36290,37093,37094,37095,37096,37097,37093,3702,37020,37029,37022,37023,37024,37025,37026,37027,37023,37029,37030,37039,37032,3701,37034,37035,37036,37037,3701,37039,37040,37049,37042,37043,37044,37045,37046,37047,37043,37049,3701,37059,37052,37053,37054,37055,37056,37057,
37053,37059,37060,37069,37062,37063,37064,37065,37066,37067,37063,37069,37070,37079,37072,37073,37074,37075,37076,37077,37073,37079,37030,37039,37032,3701,37034,37035,37036,37037,3701,37039,37090,3702,37092,37093,37094,37095,37096,37097,37093,3702,374,37909,37902,37903,37904,37905,
375,37907,37903,37909,3720,3729,3722,3723,3724,37320,37329,37322,37323,37324,37325,37326,37327,37329,3710,3719,3712,3713,3714,3715,3716,3717,3713,37340,37349,37342,37343,37344,37345,37346,37347,37343,37349,3731,37359,37352,37353,37354,37356,37357,37353,37359,37360,37369,
37362,37363,37364,37365,37366,37367,37363,37369,3715,3716,3717,3713,3719,37340,37349,37342,37343,37344,37345,37346,37347,37343,37349,3731,37359,37352,37353,37354,37355,37356,37357,37353,37359,37360,37369,37362,37363,37364,37365,37366,37367,37363,37369,37370,37379,37372,37373,37374,
37375,37376,37377,37373,37379,3710,3719,3712,3713,3714,3715,3716,3717,3713,3719,37390,3732,37392,37393,37394,37395,37396,37397,37393,3732,374,37909,37902,37903,37904,37905,375,37907,37903,37909,3720,3729,3722,3723,3724,3725,3726,3727,3723,3729,37920,37929,37922,
37923,37924,372,37926,37927,37923,37929,37930,376,37932,3791,37934,37935,378,37937,3791,376,37940,37949,3711,37943,37944,37945,37946,37947,37943,37949,377,37959,37952,37953,37954,37955,37956,37957,37953,37959,37960,37969,37962,37963,37964,37965,37966,37967,37963,37969,37970,
37979,37972,37973,37974,37975,37976,37977,37973,37979,37930,376,37932,3791,37934,37935,378,37937,3791,376,3720,3729,3722,3723,3724,3725,3726,3727,3723,3729,1000,1009,1002,1003,1004,1005,1006,1007,1003,1009,1090,102,1092,1093,1094,1095,1096,1097,1093,
102,1020,1029,1022,1023,1024,1025,1026,1027,1023,1029,1030,1039,1032,101,1034,1035,1036,1037,101,1039,1040,1049,1042,1043,1044,1045,1046,1047,1043,1049,101,1059,1052,1053,1054,1055,1056,1057,1053,191,1934,1935,18,1937,191,16,1940,
1949,111,1943,1944,1945,1946,1947,1943,1949,17,1959,1952,1953,1954,1955,1956,1957,1953,1959,1960,1969,1962,1963,1964,1965,1966,1967,1963,1969,1970,1979,1972,1973,1974,1975,1976,1977,1973,1979,1930,16,1932,191,1934,1935,18,1937,191,
16,120,129,122,123,124,125,126,127,123,129,1200,1209,1202,1203,1204,1205,1206,1207,1203,1209,1290,122,1292,1293,1294,1295,1296,1297,1293,122,1220,1229,1222,1223,1224,1225,1226,1227,1223,1229,1230,1239,1232,121,1234,1235,1236,
1237,121,1239,1240,1249,1242,1243,1244,1245,1246,1247,1243,1249,121,1259,1252,1253,1254,1255,1256,1257,1253,1259,1260,1269,1262,1263,1264,1265,1266,1267,1263,1269,1270,1279,1272,1273,1274,1275,1276,1277,1273,1279,1230,1239,1232,121,1234,
1235,1236,1237,121,1239,1290,122,1292,1293,1294,1295,1296,1297,1293,122,1300,1309,1302,1303,1304,1305,1306,1307,1303,1309,1390,132,1392,1393,1394,1395,1396,1397,1393,132,1320,1329,1322,1323,1324,1325,1326,1327,1323,1329,110,119,112,
113,114,115,116,117,113,119,1340,1349,1342,1343,1344,1345,1346,1347,1343,1349,131,1359,1352,1353,1354,1355,1356,1357,1353,1359,1360,1369,1362,1363,1364,1365,1366,1367,1363,1369,1370,1379,1372,1373,1374,1375,1377,1373,1379,110,119,
112,113,115,116,117,113,119,132,1392,1393,1729,1723,9441,94497,94493,9442,9410,9419,9412,9413,9414,9415,9416,9417,9413,9419,94590,9452,94593,94594,94595,94596,94597,95576,97396,97909,93057,4640,4653,4654,4656,4657,4653,4659,4660,4669,4662,
4663,4664,4665,4666,4669,4670,4679,4672,4673,4675,4676,4677,4639,4632,461,4634,4635,4636,4637,4639,5290,522,5294,5295,5296,5370,90742,20953,20959,2239,2234,222,2292,2293,2294,2296,2297,222,29209,29204,29205,29206,
29207,29203,29209,29292,29294,29295,29297,29223,29225,29226,29223,29229,29230,29239,2921,29234,23903,23909,2320,24393,2521,25252,25253,25256,25253,25269,25262,25264,25266,25267,25269,25270,25279,25272,25273,25274,25276,25277,25273,25230,25239,25232,
25235,25237,2521,25239,25290,25292,25293,25294,2790,2793,272,2729,2749,2745,2746,271,2759,2753,2755,2753,2759,2760,2762,2764,2766,2769,2770,2779,2772,2777,93029,8747,8743,8749,871,8759,8752,8755,8757,8769,8764,8765,
8766,8769,8770,8779,8773,8774,8775,8776,8777,8773,8779,8730,8739,8732,871,8734,8739,8790,872,8792,8795,8797,8793,872,8300,8309,8303,8304,8306,8307,8309,8394,8396,8397,832,8322,8326,8323,810,819,812,813,
814,937952,6045,6097,93203,93206,619,617,632,6395,6400,6403,6406,6490,6497,6422,6425,6423,6432,6434,6435,6437,6457,6453,6459,6460,6463,6464,6465,6466,6469,6470,6472,6473,6475,6477,6473,6430,6432,6434,6435,6437,
641,6439,6490,642,6492,6493,6494,6495,6497,6493,642,9370,9379,9372,9373,9374,9375,9376,9377,9373,9379,6590,6592,6594,6593,6520,6523,6524,6527,6523,6529,6539,651,6534,6535,6536,6539,6540,6544,6545,6547,6549,
6559,6552,6553,6555,6556,6557,6553,6560,6569,6564,6565,6567,6563,6570,6579,6572,6573,6574,6575,6577,6573,6530,651,6534,651,6590,652,6592,6594,6596,6597,6593,652,6609,6632,661,6634,6635,6636,6637,661,6647,
6643,6659,6652,6653,6654,6655,6656,6657,6653,6659,6669,6663,6664,6665,6666,6667,6663,6670,6672,6673,6675,6676,6677,6630,6632,661,6636,661,6693,6694,6695,6696,6697,6693,6700,6702,6703,6704,11439,11440,11449,11442,
11443,11444,11669,11679,11676,11677,1161,11635,11637,11639,1162,11697,11693,11709,11709,11790,11723,11727,11732,11735,11737,11749,11744,11743,1171,11300,11306,11307,11309,1132,11977,94170,94179,94172,945454,945934,946464,946465,946466,94123,94123,94139,
94134,94135,94143,9411,94153,94155,94157,7239,7232,721,7692,7694,7696,7697,7693,7703,7704,7705,7329,7324,7326,714,716,719,7359,7352,7359,7363,7367,7379,719,712,713,714,715,716,717,713,719,7390,732,7392,
7393,7394,7395,7396,7397,7393,732,74,7909,7902,7903,7929,7924,7923,7937,7947,7959,7953,7955,7957,7959,7962,7963,7964,7966,7967,7963,7969,7932,791,7935,791,722,723,9549,9543,952600,952629,952627,952629,952657,952653,
952662,952690,952697,952797,95272,952720,952724,952729,954597,954964,955669,955790,95572,955792,95629,957069)
INDEX Definition:
CREATE INDEX ByClassID ON Groups(ClassID) INCLUDE(Name,AccessLevel)
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