MySQL sudden loss of data
It is second time that records are lost in MySQL specific table.
I am having Master-Slave MySQL replication.
For the 1st time, one of my tables partially lost records on 6 May.
The weird part is, the Master instance records loss is not replicated to the Slave. It couldn't be SQL injection or script issue. I can't really remember much details as it is 2 months ago.
And recently (2nd time), the data loss happens again in another table. The data lost for records after 2015-06-05, and about 60% of the records gone. This time, the Slave has the data loss too.
I checked the Slave mysqlbinlog file, there is no DELETE FROM table command executed during that period.
Both tables are InnoDB, running MySQL server in Ubuntu instance.
I realised the data loss issue only after multiple users reporting the software behaving incorrectly.
May I know what happen to MySQL? This is frightening if the data can be lost out of nowhere. I managed to recover the data with daily backup, but this is definitely not a good option.
mysql
edited Aug 1 '17 at 8:15
joanolo
9,68842152
asked Aug 1 '17 at 7:52
neobieneobie
10614
add a comment |
It is second time that records are lost in MySQL specific table.
I am having Master-Slave MySQL replication.
For the 1st time, one of my tables partially lost records on 6 May.
The weird part is, the Master instance records loss is not replicated to the Slave. It couldn't be SQL injection or script issue. I can't really remember much details as it is 2 months ago.
And recently (2nd time), the data loss happens again in another table. The data lost for records after 2015-06-05, and about 60% of the records gone. This time, the Slave has the data loss too.
I checked the Slave mysqlbinlog file, there is no DELETE FROM table command executed during that period.
Both tables are InnoDB, running MySQL server in Ubuntu instance.
I realised the data loss issue only after multiple users reporting the software behaving incorrectly.
May I know what happen to MySQL? This is frightening if the data can be lost out of nowhere. I managed to recover the data with daily backup, but this is definitely not a good option.
mysql
edited Aug 1 '17 at 8:15
joanolo
9,68842152
asked Aug 1 '17 at 7:52
neobieneobie
10614
1
Is it possible that you have some table with aREFERENCEScontraint withON DELETE CASCADE? See 13.1.18.6 Using FOREIGN KEY Constraints. Deleting from a parent (referenced) table might have deleted from some children (referencing) tables, if there's anON DELETE CASCADE.
– joanolo
Aug 1 '17 at 8:17
I did not assign any Foreign Key.
– neobie
Aug 1 '17 at 13:24
I'dCHECKtables... this looks like something is corrupted, and this corruption is made visible when some row is inserted or updated.
– joanolo
Aug 1 '17 at 13:26
Perhaps add a trigger to record the date-time and username whenever a delete-row action is taken on that table, as a way to debug. While I don't know about the capabilities of MySQL, certainly you could do this in Postgres or other such databases.
– Basil Bourque
Aug 7 '17 at 5:07
add a comment |
It is second time that records are lost in MySQL specific table.
I am having Master-Slave MySQL replication.
For the 1st time, one of my tables partially lost records on 6 May.
The weird part is, the Master instance records loss is not replicated to the Slave. It couldn't be SQL injection or script issue. I can't really remember much details as it is 2 months ago.
And recently (2nd time), the data loss happens again in another table. The data lost for records after 2015-06-05, and about 60% of the records gone. This time, the Slave has the data loss too.
I checked the Slave mysqlbinlog file, there is no DELETE FROM table command executed during that period.
Both tables are InnoDB, running MySQL server in Ubuntu instance.
I realised the data loss issue only after multiple users reporting the software behaving incorrectly.
May I know what happen to MySQL? This is frightening if the data can be lost out of nowhere. I managed to recover the data with daily backup, but this is definitely not a good option.
mysql
edited Aug 1 '17 at 8:15
joanolo
9,68842152
asked Aug 1 '17 at 7:52
neobieneobie
10614
It is second time that records are lost in MySQL specific table.
I am having Master-Slave MySQL replication.
For the 1st time, one of my tables partially lost records on 6 May.
The weird part is, the Master instance records loss is not replicated to the Slave. It couldn't be SQL injection or script issue. I can't really remember much details as it is 2 months ago.
And recently (2nd time), the data loss happens again in another table. The data lost for records after 2015-06-05, and about 60% of the records gone. This time, the Slave has the data loss too.
I checked the Slave mysqlbinlog file, there is no DELETE FROM table command executed during that period.
Both tables are InnoDB, running MySQL server in Ubuntu instance.
I realised the data loss issue only after multiple users reporting the software behaving incorrectly.
May I know what happen to MySQL? This is frightening if the data can be lost out of nowhere. I managed to recover the data with daily backup, but this is definitely not a good option.
mysql
mysql
edited Aug 1 '17 at 8:15
joanolo
9,68842152
asked Aug 1 '17 at 7:52
neobieneobie
10614
edited Aug 1 '17 at 8:15
joanolo
9,68842152
asked Aug 1 '17 at 7:52
neobieneobie
10614
edited Aug 1 '17 at 8:15
joanolo
9,68842152
edited Aug 1 '17 at 8:15
joanolo
9,68842152
edited Aug 1 '17 at 8:15
joanolo
9,68842152
9,68842152
asked Aug 1 '17 at 7:52
neobieneobie
10614
asked Aug 1 '17 at 7:52
neobieneobie
10614
asked Aug 1 '17 at 7:52
neobieneobie
10614
10614
1
Is it possible that you have some table with aREFERENCEScontraint withON DELETE CASCADE? See 13.1.18.6 Using FOREIGN KEY Constraints. Deleting from a parent (referenced) table might have deleted from some children (referencing) tables, if there's anON DELETE CASCADE.
– joanolo
Aug 1 '17 at 8:17
I did not assign any Foreign Key.
– neobie
Aug 1 '17 at 13:24
I'dCHECKtables... this looks like something is corrupted, and this corruption is made visible when some row is inserted or updated.
– joanolo
Aug 1 '17 at 13:26
Perhaps add a trigger to record the date-time and username whenever a delete-row action is taken on that table, as a way to debug. While I don't know about the capabilities of MySQL, certainly you could do this in Postgres or other such databases.
– Basil Bourque
Aug 7 '17 at 5:07
add a comment |
1
Is it possible that you have some table with aREFERENCEScontraint withON DELETE CASCADE? See 13.1.18.6 Using FOREIGN KEY Constraints. Deleting from a parent (referenced) table might have deleted from some children (referencing) tables, if there's anON DELETE CASCADE.
– joanolo
Aug 1 '17 at 8:17
I did not assign any Foreign Key.
– neobie
Aug 1 '17 at 13:24
I'dCHECKtables... this looks like something is corrupted, and this corruption is made visible when some row is inserted or updated.
– joanolo
Aug 1 '17 at 13:26
Perhaps add a trigger to record the date-time and username whenever a delete-row action is taken on that table, as a way to debug. While I don't know about the capabilities of MySQL, certainly you could do this in Postgres or other such databases.
– Basil Bourque
Aug 7 '17 at 5:07
1
1
Is it possible that you have some table with a
REFERENCES contraint with ON DELETE CASCADE? See 13.1.18.6 Using FOREIGN KEY Constraints. Deleting from a parent (referenced) table might have deleted from some children (referencing) tables, if there's an ON DELETE CASCADE.– joanolo
Aug 1 '17 at 8:17
Is it possible that you have some table with a
REFERENCES contraint with ON DELETE CASCADE? See 13.1.18.6 Using FOREIGN KEY Constraints. Deleting from a parent (referenced) table might have deleted from some children (referencing) tables, if there's an ON DELETE CASCADE.– joanolo
Aug 1 '17 at 8:17
I did not assign any Foreign Key.
– neobie
Aug 1 '17 at 13:24
I did not assign any Foreign Key.
– neobie
Aug 1 '17 at 13:24
I'd
CHECK tables... this looks like something is corrupted, and this corruption is made visible when some row is inserted or updated.– joanolo
Aug 1 '17 at 13:26
I'd
CHECK tables... this looks like something is corrupted, and this corruption is made visible when some row is inserted or updated.– joanolo
Aug 1 '17 at 13:26
Perhaps add a trigger to record the date-time and username whenever a delete-row action is taken on that table, as a way to debug. While I don't know about the capabilities of MySQL, certainly you could do this in Postgres or other such databases.
– Basil Bourque
Aug 7 '17 at 5:07
Perhaps add a trigger to record the date-time and username whenever a delete-row action is taken on that table, as a way to debug. While I don't know about the capabilities of MySQL, certainly you could do this in Postgres or other such databases.
– Basil Bourque
Aug 7 '17 at 5:07
add a comment |
1 Answer
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Passo pelo mesmo problema sem solução a não ser migrar para outro SGDB.
answered 7 mins ago
PatrickPatrick
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Passo pelo mesmo problema sem solução a não ser migrar para outro SGDB.
answered 7 mins ago
PatrickPatrick
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Patrick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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Passo pelo mesmo problema sem solução a não ser migrar para outro SGDB.
answered 7 mins ago
PatrickPatrick
1
New contributor
Patrick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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add a comment |
Passo pelo mesmo problema sem solução a não ser migrar para outro SGDB.
answered 7 mins ago
PatrickPatrick
1
New contributor
Patrick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Passo pelo mesmo problema sem solução a não ser migrar para outro SGDB.
answered 7 mins ago
PatrickPatrick
1
New contributor
Patrick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 7 mins ago
PatrickPatrick
1
New contributor
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Check out our Code of Conduct.
answered 7 mins ago
PatrickPatrick
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answered 7 mins ago
PatrickPatrick
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New contributor
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1
Is it possible that you have some table with a
REFERENCEScontraint withON DELETE CASCADE? See 13.1.18.6 Using FOREIGN KEY Constraints. Deleting from a parent (referenced) table might have deleted from some children (referencing) tables, if there's anON DELETE CASCADE.– joanolo
Aug 1 '17 at 8:17
I did not assign any Foreign Key.
– neobie
Aug 1 '17 at 13:24
I'd
CHECKtables... this looks like something is corrupted, and this corruption is made visible when some row is inserted or updated.– joanolo
Aug 1 '17 at 13:26
Perhaps add a trigger to record the date-time and username whenever a delete-row action is taken on that table, as a way to debug. While I don't know about the capabilities of MySQL, certainly you could do this in Postgres or other such databases.
– Basil Bourque
Aug 7 '17 at 5:07