У меня есть приложение django, использующее MySQL, и в настоящее время у меня возникает проблема с отладкой тупика (я относительно новичок в SQL), который происходит спорадически (это не произойдет в течение часа или двух, а затем внезапно я получу10 тупиков подряд).Мое приложение транслирует в реальном времени информацию об акциях на ок.600 ценных бумаг, а затем для каждой ценной бумаги обновляется около 50 различных расчетов.
Похоже, это фрагмент кода, который вызывает проблему:
cursor.execute('UPDATE position_mgmt_securities '
'INNER JOIN position_mgmt_issuers ON position_mgmt_securities.issuer_id = position_mgmt_issuers.id '
'INNER JOIN position_mgmt_positions ON position_mgmt_securities.id = position_mgmt_positions.security_id '
'SET moneyness_pct = CONVERT(underlying_price / strike_price - 1, DECIMAL(12,5)) '
'WHERE (position_mgmt_securities.issuer_id IN '
'(SELECT id '
'FROM (SELECT * FROM position_mgmt_issuers) AS x '
'WHERE x.ticker = "{0}") AND position_mgmt_positions.close_date IS NULL AND position_mgmt_securities.security_type_id = "ECO")'.format(ticker.replace(' EQUITY', '')))
При запуске SHOW ENGINE INNODB STATUS я получаю следующую информацию о взаимоблокировке.
*** (1) TRANSACTION:
TRANSACTION 168976, ACTIVE 0 sec fetching rows
mysql tables in use 4, locked 4
LOCK WAIT 12 lock struct(s), heap size 1136, 265 row lock(s), undo log entries 2
MySQL thread id 58, OS thread handle 11068, query id 721547 localhost ::1 root Sending data
UPDATE position_mgmt_securities INNER JOIN position_mgmt_issuers ON position_mgmt_securities.issuer_id = position_mgmt_issuers.id INNER JOIN position_mgmt_positions ON position_mgmt_securities.id = position_mgmt_positions.security_id SET moneyness_pct = CONVERT(strike_price / underlying_price - 1, DECIMAL(12,5)) WHERE (position_mgmt_securities.issuer_id IN (SELECT id FROM (SELECT * FROM position_mgmt_issuers) AS x WHERE x.ticker = "TXT US") AND position_mgmt_positions.close_date IS NULL AND position_mgmt_securities.security_type_id = "EPO")
*** (1) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 48 page no 17 n bits 112 index PRIMARY of table `pyfmodel`.`position_mgmt_issuers` trx id 168976 lock mode S waiting
Record lock, heap no 7 PHYSICAL RECORD: n_fields 19; compact format; info bits 0
0: len 4; hex 80000100; asc ;;
1: len 6; hex 000000029412; asc ;;
2: len 7; hex 01000000d7141e; asc ;;
3: len 7; hex 49535247205553; asc ISRG US;;
4: len 22; hex 494e5455495449564520535552474943414c20494e43; asc INTUITIVE SURGICAL INC;;
5: len 8; hex 80000001e7006978; asc ix;;
6: len 3; hex 555344; asc USD;;
7: len 6; hex 333531303130; asc 351010;;
8: len 2; hex 3335; asc 35;;
9: len 3; hex 8fc6f2; asc ;;
10: SQL NULL;
11: len 5; hex 800100ae44; asc D;;
12: len 1; hex 80; asc ;;
13: SQL NULL;
14: len 30; hex 496e7475697469766520537572676963616c2c20496e632e206465736967; asc Intuitive Surgical, Inc. desig; (total 308 bytes);
15: SQL NULL;
16: SQL NULL;
17: len 8; hex 99a31c9b9d000000; asc ;;
18: SQL NULL;
*** (2) TRANSACTION:
TRANSACTION 168978, ACTIVE 0 sec fetching rows, thread declared inside InnoDB 4548
mysql tables in use 4, locked 4
18 lock struct(s), heap size 1136, 467 row lock(s), undo log entries 2
MySQL thread id 59, OS thread handle 24600, query id 721549 localhost ::1 root Sending data
UPDATE position_mgmt_securities INNER JOIN position_mgmt_issuers ON position_mgmt_securities.issuer_id = position_mgmt_issuers.id INNER JOIN position_mgmt_positions ON position_mgmt_securities.id = position_mgmt_positions.security_id SET moneyness_pct = CONVERT(strike_price / underlying_price - 1, DECIMAL(12,5)) WHERE (position_mgmt_securities.issuer_id IN (SELECT id FROM (SELECT * FROM position_mgmt_issuers) AS x WHERE x.ticker = "ISRG US") AND position_mgmt_positions.close_date IS NULL AND position_mgmt_securities.security_type_id = "EPO")
*** (2) HOLDS THE LOCK(S):
RECORD LOCKS space id 48 page no 17 n bits 112 index PRIMARY of table `pyfmodel`.`position_mgmt_issuers` trx id 168978 lock_mode X locks rec but not gap
Record lock, heap no 7 PHYSICAL RECORD: n_fields 19; compact format; info bits 0
0: len 4; hex 80000100; asc ;;
1: len 6; hex 000000029412; asc ;;
2: len 7; hex 01000000d7141e; asc ;;
3: len 7; hex 49535247205553; asc ISRG US;;
4: len 22; hex 494e5455495449564520535552474943414c20494e43; asc INTUITIVE SURGICAL INC;;
5: len 8; hex 80000001e7006978; asc ix;;
6: len 3; hex 555344; asc USD;;
7: len 6; hex 333531303130; asc 351010;;
8: len 2; hex 3335; asc 35;;
9: len 3; hex 8fc6f2; asc ;;
10: SQL NULL;
11: len 5; hex 800100ae44; asc D;;
12: len 1; hex 80; asc ;;
13: SQL NULL;
14: len 30; hex 496e7475697469766520537572676963616c2c20496e632e206465736967; asc Intuitive Surgical, Inc. desig; (total 308 bytes);
15: SQL NULL;
16: SQL NULL;
17: len 8; hex 99a31c9b9d000000; asc ;;
18: SQL NULL;
*** (2) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 48 page no 22 n bits 112 index PRIMARY of table `pyfmodel`.`position_mgmt_issuers` trx id 168978 lock mode S waiting
Record lock, heap no 10 PHYSICAL RECORD: n_fields 19; compact format; info bits 0
0: len 4; hex 800001c5; asc ;;
1: len 6; hex 000000029410; asc ;;
2: len 7; hex 02000001b81635; asc 5;;
3: len 6; hex 545854205553; asc TXT US;;
4: len 11; hex 54455854524f4e20494e43; asc TEXTRON INC;;
5: len 8; hex 80000000310036b0; asc 1 6 ;;
6: len 3; hex 555344; asc USD;;
7: len 6; hex 323031303130; asc 201010;;
8: len 2; hex 3230; asc 20;;
9: len 3; hex 8fc6f2; asc ;;
10: len 5; hex 8000003fa5; asc ? ;;
11: len 5; hex 8001003e55; asc >U;;
12: len 1; hex 80; asc ;;
13: SQL NULL;
14: len 30; hex 54657874726f6e20496e632e206973206120676c6f62616c2c206d756c74; asc Textron Inc. is a global, mult; (total 345 bytes);
15: SQL NULL;
16: SQL NULL;
17: len 8; hex 99a31c9bb4000000; asc ;;
18: len 3; hex 8fc6cd; asc ;;