Hi, I have been doing my master degree research and I am using Postgresql 8.2.5. I would appreciate if anyone could help me, ASAP, concerning the following question:
How can I obtain the time spent by the Postgresql EXECUTOR during a given time interval? I am trying to get the above information in the following way:: Using the BenchmarkSQL Software, I submit random transactions (by simulating the TPC-C benchmark) during a time interval (say 30 seconds). PostgreSQL then generates statistics for each phase that a SQL Command is executed. In thje following, it is shown the time duration of the EXECUTE Phase of some SQL Command: . . . . 2007-10-11 15:49: 05.221 BRT [46994] LOG: duration: 0.012 ms execute S_1: BEGIN 2007-10-11 15:49:05.430 BRT [46994] LOG: duration: 94.073 ms execute <unnamed>: SELECT c_discount, c_last, c_credit, w_tax FROM customer, warehouse WHERE w_id = $1 AND w_id = c_w_id AND c_d_id = $2 AND c_id = $3 2007-10-11 15:49:05.462 BRT [46994] LOG: duration: 13.662 ms execute <unnamed>: SELECT d_next_o_id, d_tax FROM district WHERE d_id = $1 AND d_w_id = $2 FO R UPDATE 2007-10-11 15:49:05.562 BRT [46994] LOG: duration: 98.818 ms execute <unnamed>: INSERT INTO NEW_ORDER (no_o_id, no_d_id, no_w_id) VALUES ( $1, $2, $3) 2007-10-11 15:49:05.579 BRT [46994] LOG: duration: 15.459 ms execute <unnamed>: UPDATE district SET d_next_o_id = d_next_o_id + 1 WHERE d_id = $1 AND d_w _id = $2 2007-10-11 15:49:05.748 BRT [46994] LOG: duration: 122.387 ms execute <unnamed>: INSERT INTO OORDER (o_id, o_d_id, o_w_id, o_c_id, o_entry_d, o_ol_cnt, o _all_local) VALUES ($1, $2, $3, $4, $5, $6, $7) 2007-10-11 15:49:05.779 BRT [46994] LOG: duration: 29.787 ms execute <unnamed>: SELECT i_price, i_name , i_data FROM item WHERE i_id = $1 2007-10-11 15:49: 05.846 BRT [46994] LOG: duration: 64.963 ms execute <unnamed>: SELECT s_quantity, s_data, s_dist_01, s_dist_02, s_dist_03, s_dist_04, s_d ist_05, s_dist_06, s_dist_07, s_dist_08, s_dist_09, s_dist_10 FROM stock WHERE s_i_id = $1 AND s_w_id = $2 FOR UPDATE 2007-10-11 15:49:05.882 BRT [46994] LOG: duration: 33.865 ms execute <unnamed>: SELECT i_price, i_name , i_data FROM item WHERE i_id = $1 2007-10-11 15:49:05.931 BRT [46994] LOG: duration: 48.075 ms execute <unnamed>: SELECT s_quantity, s_data, s_dist_01, s_dist_02, s_dist_03, s_dist_04, s_d ist_05, s_dist_06, s_dist_07, s_dist_08, s_dist_09, s_dist_10 FROM stock WHERE s_i_id = $1 AND s_w_id = $2 FOR UPDATE 2007-10-11 15:49:05.962 BRT [46994] LOG: duration: 28.782 ms execute <unnamed>: SELECT i_price, i_name , i_data FROM item WHERE i_id = $1 2007-10-11 15:49:06.002 BRT [46994] LOG: duration: 38.026 ms execute <unnamed>: SELECT s_quantity, s_data, s_dist_01, s_dist_02, s_dist_03, s_dist_04, s_d ist_05, s_dist_06, s_dist_07, s_dist_08, s_dist_09, s_dist_10 FROM stock WHERE s_i_id = $1 AND s_w_id = $2 FOR UPDATE 2007-10-11 15:49:06.027 BRT [46994] LOG: duration: 23.220 ms execute <unnamed>: SELECT i_price, i_name , i_data FROM item WHERE i_id = $1 2007-10-11 15:49:06.043 BRT [46994] LOG: duration: 14.308 ms execute <unnamed>: SELECT s_quantity, s_data, s_dist_01, s_dist_02, s_dist_03, s_dist_04, s_d ist_05, s_dist_06, s_dist_07, s_dist_08, s_dist_09, s_dist_10 FROM stock WHERE s_i_id = $1 AND s_w_id = $2 FOR UPDATE . . . . Trying to answer my initial question, I am doing something like this: 1. Through the statements TIMESTAMP, I calculate the total time interval in which all the statments had been executed: (END TIMESTAMP(2007-10-11 15:49: 06.043) - BEGIN TIMESTAMP (2007-10-11 15:49:05.221)) 2. Then I sum all the 'duration' fields of all EXECUTOR Sections of all statements executed. This, in thesis, give me the amount of time that the executor had been used during the total time interval in which the statements had been executed) The problem I have encountered is that the sum of executor's duration time is, *sometimes*, bigger than the total time interval in which the statements had been executed!! And this makes no sense! In some tests I have done, I have found these results: - Total Time interval which BenchmarkSQL submitted queries = 30 seconds - sum of executor's duration time during this period of time = 2 minutes and 36 seconds!! (5x longer than total time) How could the sum of duration time of executor be longer than the sum of duration of the statements that use it? Can anyone, please, help me to solve this? Many thanks, Camilo _________________________________________________________________ Veja mapas e encontre as melhores rotas para fugir do trânsito com o Live Search Maps! http://www.livemaps.com.br/index.aspx?tr=true
