Ini hampir pasti merupakan penyebab pertanyaan saya yang lain , tetapi saya pikir layak untuk memisahkan keduanya karena saya memiliki hipotesis berdasarkan log berikut yang ingin saya palsukan atau verifikasi.
Hipotesis saya adalah bahwa kebuntuan lainnya sebenarnya adalah hasil dari pertanyaan berikut, dengan permintaan asli disembunyikan berdasarkan pemahaman saya status innodb hanya menunjukkan transaksi terbaru (apakah ini benar?).
Berdasarkan log, saya telah memeriksa kode kami dan menemukan dua pertanyaan berikut dieksekusi secara berurutan:
db.Execute("UPDATE people SET iphone_device_id=NULL WHERE iphone_device_id=@0 AND people_id<>@1", DeviceID, m_User.people_id);
// I have hard coded this query in this snippet to simplify things
db.Execute("UPDATE people SET company_id = 444, name = 'Dad', password = '<pass>', temp_password = NULL, reset_password_hash = NULL, email = '<redacted>@gmail.com', phone = NULL, mobile = NULL, iphone_device_id = 'iphone:<device_id_blah>', iphone_device_time = '2011-06-06 19:12:29', last_checkin = '2011-06-07 02:49:47', location_lat = <lat>, location_long = <lng>, gps_strength = 66, picture_blob_id = 1661, authority = 1, active = 1, date_created = '2011-03-20 19:18:34', last_login = '2011-06-07 11:15:01', panic_mode = 0, battery_level = 0.55, battery_state = 'unplugged' WHERE people_id = 666");
Di mana db.Execute pada dasarnya melakukan ExecuteNonQuery pada objek System.Data DbCommand .
Jadi apakah urutan pertanyaan ini akan menghasilkan jalan buntu? Hipotesis saya adalah bahwa dua perintah lapangan yang berbeda dalam dua kueri menyebabkan masalah? Bisakah saya menyelesaikan dua pertanyaan dalam transaksi untuk menyelesaikan kebuntuan?
------------------------
LATEST DETECTED DEADLOCK
------------------------
110607 11:15:01
*** (1) TRANSACTION:
TRANSACTION 0 45674214, ACTIVE 0 sec, OS thread id 2584 starting index read
mysql tables in use 1, locked 1
LOCK WAIT 3 lock struct(s), heap size 1216, 2 row lock(s)
MySQL thread id 109, query id 4044915 localhost 127.0.0.1 famdev Searching rows for update
UPDATE people SET iphone_device_id=NULL WHERE iphone_device_id='iphone:<device_id_blah>' AND people_id<>666
*** (1) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 0 page no 4611 n bits 152 index `PRIMARY` of table `family`.`people` trx id 0 45674214 lock_mode X locks rec but not gap waiting
Record lock, heap no 7 PHYSICAL RECORD: n_fields 25; compact format; info bits 0
0: len 8; hex 8000000000000941; asc A;; 1: len 6; hex 000002b8eedf; asc ;; 2: len 7; hex 00000002801064; asc d;; 3: len 8; hex 80000000000004c6; asc ;; 4: len 3; hex 446164; asc Dad;; 5: len 30; hex <data0>; asc <data1>;...(truncated); 6: SQL NULL; 7: SQL NULL; 8: len 17; hex <data2>; asc <redacted>@gmail.com;; 9: SQL NULL; 10: SQL NULL; 11: len 30; hex <data3>; asc iphone:<data4>;...(truncated); 12: len 8; hex <data5>; asc J] };; 13: len 8; hex <data6>; asc J] ;; 14: len 8; hex <data7>; asc ~t g C@;; 15: len 8; hex <data8>; asc G I &S ;; 16: len 2; hex 8042; asc B;; 17: len 8; hex <data9>; asc };; 18: len 4; hex <data10>; asc ;; 19: len 1; hex 81; asc ;; 20: len 8; hex <data11>; asc JL} Z;; 21: len 8; hex <data12>; asc J] M;; 22: len 1; hex 80; asc ;; 23: len 8; hex <data13>; asc ?;; 24: len 9; hex <data14>; asc unplugged;;
*** (2) TRANSACTION:
TRANSACTION 0 45674209, ACTIVE 0 sec, OS thread id 3804 starting index read, thread declared inside InnoDB 500
mysql tables in use 1, locked 1
5 lock struct(s), heap size 1216, 2 row lock(s), undo log entries 1
MySQL thread id 110, query id 4044916 localhost 127.0.0.1 famdev Updating
UPDATE people SET company_id = 444, name = 'Dad', password = '<pass>', temp_password = NULL, reset_password_hash = NULL, email = '<redacted>@gmail.com', phone = NULL, mobile = NULL, iphone_device_id = 'iphone:<device_id_blah>', iphone_device_time = '2011-06-06 19:12:29', last_checkin = '2011-06-07 02:49:47', location_lat = <lat>, location_long = <lng>, gps_strength = 66, picture_blob_id = 1661, authority = 1, active = 1, date_created = '2011-03-20 19:18:34', last_login = '2011-06-07 11:15:01', panic_mode = 0, battery_level = 0.55, battery_state = 'unplugged' WHERE people_id = 666
*** (2) HOLDS THE LOCK(S):
RECORD LOCKS space id 0 page no 4611 n bits 152 index `PRIMARY` of table `family`.`people` trx id 0 45674209 lock mode S locks rec but not gap
Record lock, heap no 7 PHYSICAL RECORD: n_fields 25; compact format; info bits 0
0: len 8; hex 8000000000000941; asc A;; 1: len 6; hex 000002b8eedf; asc ;; 2: len 7; hex 00000002801064; asc d;; 3: len 8; hex 80000000000004c6; asc ;; 4: len 3; hex 446164; asc Dad;; 5: len 30; hex <data0>; asc <data1>;...(truncated); 6: SQL NULL; 7: SQL NULL; 8: len 17; hex <data2>; asc <redacted>@gmail.com;; 9: SQL NULL; 10: SQL NULL; 11: len 30; hex <data3>; asc iphone:<data4>;...(truncated); 12: len 8; hex <data5>; asc J] };; 13: len 8; hex <data6>; asc J] ;; 14: len 8; hex <data7>; asc ~t g C@;; 15: len 8; hex <data8>; asc G I &S ;; 16: len 2; hex 8042; asc B;; 17: len 8; hex <data9>; asc };; 18: len 4; hex <data10>; asc ;; 19: len 1; hex 81; asc ;; 20: len 8; hex <data11>; asc JL} Z;; 21: len 8; hex <data12>; asc J] M;; 22: len 1; hex 80; asc ;; 23: len 8; hex <data13>; asc ?;; 24: len 9; hex <data14>; asc unplugged;;
*** (2) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 0 page no 4611 n bits 152 index `PRIMARY` of table `family`.`people` trx id 0 45674209 lock_mode X locks rec but not gap waiting
Record lock, heap no 7 PHYSICAL RECORD: n_fields 25; compact format; info bits 0
0: len 8; hex 8000000000000941; asc A;; 1: len 6; hex 000002b8eedf; asc ;; 2: len 7; hex 00000002801064; asc d;; 3: len 8; hex 80000000000004c6; asc ;; 4: len 3; hex 446164; asc Dad;; 5: len 30; hex <data0>; asc <data1>;...(truncated); 6: SQL NULL; 7: SQL NULL; 8: len 17; hex <data2>; asc <redacted>@gmail.com;; 9: SQL NULL; 10: SQL NULL; 11: len 30; hex <data3>; asc iphone:<data4>;...(truncated); 12: len 8; hex <data5>; asc J] };; 13: len 8; hex <data6>; asc J] ;; 14: len 8; hex <data7>; asc ~t g C@;; 15: len 8; hex <data8>; asc G I &S ;; 16: len 2; hex 8042; asc B;; 17: len 8; hex <data9>; asc };; 18: len 4; hex <data10>; asc ;; 19: len 1; hex 81; asc ;; 20: len 8; hex <data11>; asc JL} Z;; 21: len 8; hex <data12>; asc J] M;; 22: len 1; hex 80; asc ;; 23: len 8; hex <data13>; asc ?;; 24: len 9; hex <data14>; asc unplugged;;