Deadly Sins of MySQL Operations

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Replica(on Dri\ Happens • Data on a replica,on slave may not be true. – Non-‐determinis,c queries update the slave. – Someone may change data on the slave. – Data discrepancies tend to compound. • <strong>MySQL</strong> has no built-‐in checks.
Page 1 and 2: 10 Deadly Sins of MySQL Databa
Page 3: Who Changed the Config? • Data
Page 6 and 7: More Readable • Your config fi
Page 8 and 9: MySQL Opera,ons Mistakes ABANDONE
Page 10 and 11: Abandoned Experiments • Change
Page 12 and 13: Leave It Alone • Defaults are
Page 14 and 15: MySQL Opera,ons Mistakes AIMLESS
Page 16 and 17: Step 1 • Choose a measurable
Page 18 and 19: Step 3 • Research the range o
Page 20 and 21: Tools • Use pt-mext for ad ho
Page 22 and 23: MySQL Opera,ons Mistakes BRITTLE
Page 24 and 25: False Posi8ves • Reviewing a s
Page 26 and 27: How to Verify? • Restore compl
Page 28 and 29: Don’t think of a backup stra
Page 32 and 33: Impact of Data Dri\ • Replica,
Page 35 and 36: Solu8ons to Correct Data Dri\
Page 38 and 39: Too Many Indexes • Consumes sp
Page 40 and 41: Too Many Indexes • Makes more
Page 42 and 43: Detec8ng Duplicate Indexes • My
Page 44 and 45: Detec8ng Duplicate Indexes • Us
Page 46 and 47: Detec8ng Unused Indexes • Use
Page 48 and 49: Detec8ng Unused Indexes • Use
Page 50: MySQL Opera,ons Mistakes NO CAPA
Page 53 and 54: Disk BoYlenecks • Greatest sing
Page 55 and 56: Measure Usage • Monitor usage
Page 57 and 58: MySQL Opera,ons Mistakes SERVICE
Page 59 and 60: Solu8ons for ALTER TABLE • MyS
Page 61 and 62: Solu8ons for Failover 61• Perco
Page 63 and 64: Bonus deadly sin • Not going
Page 65: License and Copyright Copyright

Deadly Sins of MySQL Operations

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