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Topic # 138110 20-Dec-2013 00:08
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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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  Reply # 955212 20-Dec-2013 06:54
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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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1494 posts

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+1 received by user: 221

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  Reply # 955244 20-Dec-2013 07:58
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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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