Um einen ersten Überblick um die Laufzeit von SQL Statements, genauer gesagt über die Elapsed_time pro Execution, zu bekommen, nutze ich folgende kleines SQL Abfrage. Dadurch sind zum einen Ausreißer schnell ersichtlich und zum anderen bekommt man einer fremden DB schnell einen Überblick, welche DB User die größten Laufzeiten haben.
Es ist natürlich auch klar, dass dies nur einen Überblick verschafft. Wenn die RunTime (RT) = Elapsed_time / Executions hoch ist, wird in dieser Übersicht natürlich nicht sofort ersichtlich, wo die Zeit wirklich verbraucht wird. Einzig der durchschnittliche CPU Verbrauch gibt ein Indiz dafür, wieviel für die Wartezeit verbraucht wurde, z.B. auf IO Wait, oder Cluster Wait, oder …
Dieses muss dann in weiteren, detaillierten Abfragen genauer untersucht werden.
Auch habe ich hier bewusst auf die SQL_ID verzichtet, um bei gleichen SQL mit nur unterschiedlichen Werten (anstelle von Binds) nicht unzählig viele Zeilen zu bekommen. Deshalb habe ich stellvertretend dazu die ersten 20 Zeichen des SQL-Textes eingesetzt.
Wenn man die Abfrage auf ein paar Schema einschränken kann, wird natürlich die Ergebnismenge kleiner und aussagekräftiger, der erste Teile DATA des With-Clause dafür um so performanter:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 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, round(Q.CPU_TIME_DELTA/1000/Q.EXECUTIONS_DELTA) AS CPU , Q.EXECUTIONS_DELTA AS EXECS , Q.PARSE_CALLS_DELTA AS PARSE_CALLS , Q.ROWS_PROCESSED_DELTA AS ROWS_PROCESSED , Q.FETCHES_DELTA AS FETCHES FROM dba_hist_sqlstat q , dba_hist_snapshot s , dba_hist_sqltext t WHERE 1=1 AND Q.PARSING_SCHEMA_NAME NOT IN ('DBSNMP') AND Q.PARSING_SCHEMA_NAME NOT LIKE 'SYS%' AND Q.EXECUTIONS_DELTA > 0 AND Q.DBID = S.DBID AND Q.INSTANCE_NUMBER = S.INSTANCE_NUMBER AND Q.SNAP_ID = S.SNAP_ID AND Q.DBID = T.DBID AND Q.SQL_ID = T.SQL_ID AND (S.BEGIN_INTERVAL_TIME >= trunc(SYSTIMESTAMP-7)) ) , D1 AS (SELECT DBID , INST_ID , SNAP_ID , SQLTYPE , USRNAME , SQLTEXT , COUNT(*) H1 FROM DATA WHERE RT <= 1 GROUP BY DBID , INST_ID , SNAP_ID , SQLTYPE , USRNAME , SQLTEXT ) , D10 AS (SELECT DBID , INST_ID , SNAP_ID , SQLTYPE , USRNAME , SQLTEXT , COUNT(*) H10 FROM DATA WHERE RT <= 10 AND RT > 1 GROUP BY DBID , INST_ID , SNAP_ID , SQLTYPE , USRNAME , SQLTEXT ) , D50 AS (SELECT DBID , INST_ID , SNAP_ID , SQLTYPE , USRNAME , SQLTEXT , COUNT(*) H50 FROM DATA WHERE RT <= 50 AND RT > 10 GROUP BY DBID , INST_ID , SNAP_ID , SQLTYPE , USRNAME , SQLTEXT ) , D100 AS (SELECT DBID , INST_ID , SNAP_ID , SQLTYPE , USRNAME , SQLTEXT , COUNT(*) H100 FROM DATA WHERE RT <= 100 AND RT > 50 GROUP BY DBID , INST_ID , SNAP_ID , SQLTYPE , USRNAME , SQLTEXT ) , D500 AS (SELECT DBID , INST_ID , SNAP_ID , SQLTYPE , USRNAME , SQLTEXT , COUNT(*) H500 FROM DATA WHERE RT <= 500 AND RT > 100 GROUP BY DBID , INST_ID , SNAP_ID , SQLTYPE , USRNAME , SQLTEXT ) , D1000 AS (SELECT DBID , INST_ID , SNAP_ID , SQLTYPE , USRNAME , SQLTEXT , COUNT(*) H1000 FROM DATA WHERE RT <= 1000 AND RT > 500 GROUP BY DBID , INST_ID , SNAP_ID , SQLTYPE , USRNAME , SQLTEXT ) , D5000 AS (SELECT DBID , INST_ID , SNAP_ID , SQLTYPE , SQLTEXT , USRNAME , COUNT(*) H5000 FROM DATA WHERE RT <= 5000 AND RT > 1000 GROUP BY DBID , INST_ID , SNAP_ID , SQLTYPE , USRNAME , SQLTEXT ) , D10000 AS (SELECT DBID , INST_ID , SNAP_ID , SQLTYPE , USRNAME , SQLTEXT , COUNT(*) H10000 FROM DATA WHERE RT <= 10000 AND RT > 5000 GROUP BY DBID , INST_ID , SNAP_ID , SQLTYPE , USRNAME , SQLTEXT ) , D50000 AS (SELECT DBID , INST_ID , SNAP_ID , SQLTYPE , USRNAME , SQLTEXT , COUNT(*) H50000 FROM DATA WHERE RT <= 50000 AND RT > 10000 GROUP BY DBID , INST_ID , SNAP_ID , SQLTYPE , USRNAME , SQLTEXT ) , DREST AS (SELECT DBID , INST_ID , SNAP_ID , SQLTYPE , USRNAME , SQLTEXT , COUNT(*) HREST FROM DATA WHERE RT > 50000 GROUP BY DBID , INST_ID , SNAP_ID , SQLTYPE , USRNAME , SQLTEXT ) , DALL AS (SELECT DBID , INST_ID , SNAP_ID , STARTTIME , SQLTYPE , USRNAME , SQLTEXT , round( AVG(PARSE_CALLS), 2) AS AVG_PARSE , round( AVG(ROWS_PROCESSED), 2) AS AVG_ROWS , round( AVG(FETCHES), 2) AS AVG_FETCH , round( AVG(CPU),2) AS AVGCPU , round( AVG(RT), 2) AS AVGRT , round( MIN(RT), 2) AS MINRT , round( MAX(RT), 2) AS MAXRT , SUM(EXECS) AS EXECS , COUNT(*) AS HALL FROM DATA GROUP BY DBID , INST_ID , SNAP_ID , STARTTIME , SQLTYPE , USRNAME , SQLTEXT ) SELECT da.INST_ID , da.snap_id , da.STARTTIME , da.USRNAME , da.SQLTYPE , da.SQLTEXT , da.HALL "ALL" , da.Execs "Execs" , da.AVG_PARSE "AvgParses" , da.AVG_ROWS "AvgRows" , da.AVG_FETCH "AvgFetches" , da.avgcpu "AvgCPU(ms)" , da.MINRT "Min(ms)" , da.AVGRT "Avg(ms)" , da.MAXRT "Max(ms)" , H1 "<=1ms" , H10 "<=10ms" , H50 "<=50ms" , H100 "<=100ms" , H500 "<=500ms" , H1000 "<=1sec" , H5000 "<=5sec" , H10000 "<=10sec" , H50000 "<=50sec" , HREST "Rest" FROM DALL da , D1 d1 , D10 d2 , D50 d3 , D100 d4 , D500 d5 , D1000 d6 , D5000 d7 , D10000 d8 , D50000 d9 , DREST d WHERE (da.DBID = d1.DBID (+)) AND (da.INST_ID = d1.INST_ID (+)) AND (da.SNAP_ID = d1.SNAP_ID (+)) AND (da.SQLTYPE = d1.SQLTYPE (+)) AND (da.USRNAME = d1.USRNAME (+)) AND (da.SQLTEXT = d1.SQLTEXT (+)) -- AND (da.DBID = d2.DBID (+)) AND (da.INST_ID = d2.INST_ID (+)) AND (da.SNAP_ID = d2.SNAP_ID (+)) AND (da.SQLTYPE = d2.SQLTYPE (+)) AND (da.USRNAME = d2.USRNAME (+)) AND (da.SQLTEXT = d2.SQLTEXT (+)) -- AND (da.DBID = d3.DBID (+)) AND (da.INST_ID = d3.INST_ID (+)) AND (da.SNAP_ID = d3.SNAP_ID (+)) AND (da.SQLTYPE = d3.SQLTYPE (+)) AND (da.USRNAME = d3.USRNAME (+)) AND (da.SQLTEXT = d3.SQLTEXT (+)) -- AND (da.DBID = d4.DBID (+)) AND (da.INST_ID = d4.INST_ID (+)) AND (da.SNAP_ID = d4.SNAP_ID (+)) AND (da.SQLTYPE = d4.SQLTYPE (+)) AND (da.USRNAME = d4.USRNAME (+)) AND (da.SQLTEXT = d4.SQLTEXT (+)) -- AND (da.DBID = d5.DBID (+)) AND (da.INST_ID = d5.INST_ID (+)) AND (da.SNAP_ID = d5.SNAP_ID (+)) AND (da.SQLTYPE = d5.SQLTYPE (+)) AND (da.USRNAME = d5.USRNAME (+)) AND (da.SQLTEXT = d5.SQLTEXT (+)) -- AND (da.DBID = d6.DBID (+)) AND (da.INST_ID = d6.INST_ID (+)) AND (da.SNAP_ID = d6.SNAP_ID (+)) AND (da.SQLTYPE = d6.SQLTYPE (+)) AND (da.USRNAME = d6.USRNAME (+)) AND (da.SQLTEXT = d6.SQLTEXT (+)) -- AND (da.DBID = d7.DBID (+)) AND (da.INST_ID = d7.INST_ID (+)) AND (da.SNAP_ID = d7.SNAP_ID (+)) AND (da.SQLTYPE = d7.SQLTYPE (+)) AND (da.USRNAME = d7.USRNAME (+)) AND (da.SQLTEXT = d7.SQLTEXT (+)) -- AND (da.DBID = d8.DBID (+)) AND (da.INST_ID = d8.INST_ID (+)) AND (da.SNAP_ID = d8.SNAP_ID (+)) AND (da.SQLTYPE = d8.SQLTYPE (+)) AND (da.USRNAME = d8.USRNAME (+)) AND (da.SQLTEXT = d8.SQLTEXT (+)) -- AND (da.DBID = d9.DBID (+)) AND (da.INST_ID = d9.INST_ID (+)) AND (da.SNAP_ID = d9.SNAP_ID (+)) AND (da.SQLTYPE = d9.SQLTYPE (+)) AND (da.USRNAME = d9.USRNAME (+)) AND (da.SQLTEXT = d9.SQLTEXT (+)) -- AND (da.DBID = d.DBID (+)) AND (da.INST_ID = d.INST_ID (+)) AND (da.SNAP_ID = d.SNAP_ID (+)) AND (da.SQLTYPE = d.SQLTYPE (+)) AND (da.USRNAME = d.USRNAME (+)) AND (da.SQLTEXT = d.SQLTEXT (+)) -- ORDER BY da.STARTTIME DESC , da.INST_ID , da.USRNAME , da.SQLTYPE , da.SQLTEXT , da.HALL |
Ein mögliches Ergebnis kann dann so aussehen:
