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976 posts

Ultimate Geek
+1 received by user: 31


Topic # 138110 20-Dec-2013 00:08 Send private message

Hey Guys,

Develop a booking systems for niche markets.  I have one such marked that uses it very - vigorously.

They have been doing their annual bookings for the new year and suddenly I have 15,000 rows from a specific table dissapear.

The CPU was running high 100% for 2 day during peak times, could has have been the cause?  I have checked re-chekkd there is no other obvious cause!

Things in my mind I have been through

SQL injection, its very unlikely as always sanetize the code.  Also the table names are not obvious, and we are missing random amounts during a time i know the cpu was 100% for hours.
Bad code - this was my first though, and I have checked and check fory any DELETE, REPLACE even UPDATE on the table

Anybody got some thoughts,

I am running xt-small-RDS by Amazon AWS.  It was on a micro server but I have upgraded it and recoded to keep CPU below 50% now sits camly at 2-7%

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6520 posts

Uber Geek
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  Reply # 955212 20-Dec-2013 06:54 Send private message

I'd be very surprised if high CPU could make database row disappear. That's about the last place I'd look. Bugs, SQL injection, etc. Do you have logs of the SQL executed? Backups?




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976 posts

Ultimate Geek
+1 received by user: 31


  Reply # 955244 20-Dec-2013 07:58 Send private message

Backups yes, log no, turning it on now, need to upgrade to 5.6 for RDS.

It is a rather large table, 70,000 records, still somewhat confused!

The search continues! Will be going through more application code, but nothing is jumping out.

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