Optimize MySQL update statement
I have an update query that selects data from a table (HST) and updates it into another table (PCL). The PCL table contains ~30000 rows while the HST table contains about 1.5 million rows. I have multiple (composite) indexes on HST and despite being a large table all queries on it are fairly quick (~2-3 sec). However, when I attempt to select rows from this table and update PCL, it takes 3-4 hours, and in most cases I get "Lock wait timeout exceeded; try restarting transaction" errors and I have to keep trying until it works.
UPDATE PCL
SET `T2A` = (SELECT HST.`Date` from `HST` WHERE HST.`SYM`=PCL.INST AND
HST.`DATE` >= PCL.Date AND HST.`HP` >= PCL.T2 order by HST.`Date` limit 1)
WHERE `BS` = 'B' AND `T1A` IS NOT NULL;
Is there a way I can rewrite the above query so that it runs faster?
This is the structure of the PCL table
SrNo, int(6) | Created, datetime | Time, datetime | CNo, varchar(6) |
Date, date | A1, varchar(4) | A2, varchar(4) | A3, varchar(4) |
F1, varchar(6) | INST, varchar(20) | BS, char(1) | CAB, char(2) |
CM, float(8,2) | CMSQL, float(8,2) | T1, float(8,2) | T2, float(8,2) |
T3, float(8,2) | SL, float(8,2) | FSL, float(8,2) | P1, int(4) |
P2, int(4) | TT, char(1) | P1C, date | P2C, date | DateP1, date |
DateP2, date | P1C, date | P2C, date | T1A, date | T2A, date |
T3A, date | SLH, date | TT, float | TSt, char(3) | TA, float |
S10K, float | CV, float | R%, float | C1, char(1) | L1, varchar(6) |
This is the HST table
SrNo, int(11) | SYM, varchar(20) | Date, date | PC, float(8,2) |
OP, float(8,2) | HP, float(8,2) | LP, float(8,2) | CP, float(8,2) |
mysql optimization mysql-5.6 update
asked 17 mins ago
QuarkQuark
1
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I have an update query that selects data from a table (HST) and updates it into another table (PCL). The PCL table contains ~30000 rows while the HST table contains about 1.5 million rows. I have multiple (composite) indexes on HST and despite being a large table all queries on it are fairly quick (~2-3 sec). However, when I attempt to select rows from this table and update PCL, it takes 3-4 hours, and in most cases I get "Lock wait timeout exceeded; try restarting transaction" errors and I have to keep trying until it works.
UPDATE PCL
SET `T2A` = (SELECT HST.`Date` from `HST` WHERE HST.`SYM`=PCL.INST AND
HST.`DATE` >= PCL.Date AND HST.`HP` >= PCL.T2 order by HST.`Date` limit 1)
WHERE `BS` = 'B' AND `T1A` IS NOT NULL;
Is there a way I can rewrite the above query so that it runs faster?
This is the structure of the PCL table
SrNo, int(6) | Created, datetime | Time, datetime | CNo, varchar(6) |
Date, date | A1, varchar(4) | A2, varchar(4) | A3, varchar(4) |
F1, varchar(6) | INST, varchar(20) | BS, char(1) | CAB, char(2) |
CM, float(8,2) | CMSQL, float(8,2) | T1, float(8,2) | T2, float(8,2) |
T3, float(8,2) | SL, float(8,2) | FSL, float(8,2) | P1, int(4) |
P2, int(4) | TT, char(1) | P1C, date | P2C, date | DateP1, date |
DateP2, date | P1C, date | P2C, date | T1A, date | T2A, date |
T3A, date | SLH, date | TT, float | TSt, char(3) | TA, float |
S10K, float | CV, float | R%, float | C1, char(1) | L1, varchar(6) |
This is the HST table
SrNo, int(11) | SYM, varchar(20) | Date, date | PC, float(8,2) |
OP, float(8,2) | HP, float(8,2) | LP, float(8,2) | CP, float(8,2) |
mysql optimization mysql-5.6 update
asked 17 mins ago
QuarkQuark
1
New contributor
Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I have an update query that selects data from a table (HST) and updates it into another table (PCL). The PCL table contains ~30000 rows while the HST table contains about 1.5 million rows. I have multiple (composite) indexes on HST and despite being a large table all queries on it are fairly quick (~2-3 sec). However, when I attempt to select rows from this table and update PCL, it takes 3-4 hours, and in most cases I get "Lock wait timeout exceeded; try restarting transaction" errors and I have to keep trying until it works.
UPDATE PCL
SET `T2A` = (SELECT HST.`Date` from `HST` WHERE HST.`SYM`=PCL.INST AND
HST.`DATE` >= PCL.Date AND HST.`HP` >= PCL.T2 order by HST.`Date` limit 1)
WHERE `BS` = 'B' AND `T1A` IS NOT NULL;
Is there a way I can rewrite the above query so that it runs faster?
This is the structure of the PCL table
SrNo, int(6) | Created, datetime | Time, datetime | CNo, varchar(6) |
Date, date | A1, varchar(4) | A2, varchar(4) | A3, varchar(4) |
F1, varchar(6) | INST, varchar(20) | BS, char(1) | CAB, char(2) |
CM, float(8,2) | CMSQL, float(8,2) | T1, float(8,2) | T2, float(8,2) |
T3, float(8,2) | SL, float(8,2) | FSL, float(8,2) | P1, int(4) |
P2, int(4) | TT, char(1) | P1C, date | P2C, date | DateP1, date |
DateP2, date | P1C, date | P2C, date | T1A, date | T2A, date |
T3A, date | SLH, date | TT, float | TSt, char(3) | TA, float |
S10K, float | CV, float | R%, float | C1, char(1) | L1, varchar(6) |
This is the HST table
SrNo, int(11) | SYM, varchar(20) | Date, date | PC, float(8,2) |
OP, float(8,2) | HP, float(8,2) | LP, float(8,2) | CP, float(8,2) |
mysql optimization mysql-5.6 update
asked 17 mins ago
QuarkQuark
1
New contributor
Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have an update query that selects data from a table (HST) and updates it into another table (PCL). The PCL table contains ~30000 rows while the HST table contains about 1.5 million rows. I have multiple (composite) indexes on HST and despite being a large table all queries on it are fairly quick (~2-3 sec). However, when I attempt to select rows from this table and update PCL, it takes 3-4 hours, and in most cases I get "Lock wait timeout exceeded; try restarting transaction" errors and I have to keep trying until it works.
UPDATE PCL
SET `T2A` = (SELECT HST.`Date` from `HST` WHERE HST.`SYM`=PCL.INST AND
HST.`DATE` >= PCL.Date AND HST.`HP` >= PCL.T2 order by HST.`Date` limit 1)
WHERE `BS` = 'B' AND `T1A` IS NOT NULL;
Is there a way I can rewrite the above query so that it runs faster?
This is the structure of the PCL table
SrNo, int(6) | Created, datetime | Time, datetime | CNo, varchar(6) |
Date, date | A1, varchar(4) | A2, varchar(4) | A3, varchar(4) |
F1, varchar(6) | INST, varchar(20) | BS, char(1) | CAB, char(2) |
CM, float(8,2) | CMSQL, float(8,2) | T1, float(8,2) | T2, float(8,2) |
T3, float(8,2) | SL, float(8,2) | FSL, float(8,2) | P1, int(4) |
P2, int(4) | TT, char(1) | P1C, date | P2C, date | DateP1, date |
DateP2, date | P1C, date | P2C, date | T1A, date | T2A, date |
T3A, date | SLH, date | TT, float | TSt, char(3) | TA, float |
S10K, float | CV, float | R%, float | C1, char(1) | L1, varchar(6) |
This is the HST table
SrNo, int(11) | SYM, varchar(20) | Date, date | PC, float(8,2) |
OP, float(8,2) | HP, float(8,2) | LP, float(8,2) | CP, float(8,2) |
mysql optimization mysql-5.6 update
mysql optimization mysql-5.6 update
asked 17 mins ago
QuarkQuark
1
New contributor
Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 17 mins ago
QuarkQuark
1
New contributor
Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 17 mins ago
QuarkQuark
1
New contributor
Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 17 mins ago
QuarkQuark
1
asked 17 mins ago
QuarkQuark
1
1
New contributor
Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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Check out our Code of Conduct.
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