Deadly Sins of MySQL Operations

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Step 3 • Research the range <strong>of</strong> reasonable values for the corresponding configura,on variable. • Make a modest change. – For example, this variable was 256KB by default. Let’s raise it to 384KB. mysql> SET GLOBAL sort_buffer_size = 384*1024;
Step 4 • Re-‐measure the rate <strong>of</strong> increase: 80 60 40 20 0 13:00 13:01 13:02 13:03 13:04 Sort merge passes 13:05 13:06 13:07 13:08 13:09 13:10 13:11 13:12 13:13 13:14 13:15 13:16
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 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 31 and 32: Replica(on Dri\ Happens • Data
Page 33: Solu8ons to Prevent Data Dri\
Page 36: MySQL Opera,ons Mistakes INDEX H
Page 39 and 40: Too Many Indexes • Consumes sp
Page 41 and 42: Duplicate Indexes • MySQL allow
Page 43 and 44: Detec8ng Duplicate Indexes • My
Page 45 and 46: Unused Indexes • Consume more
Page 47 and 48: Detec8ng Unused Indexes • Use
Page 49 and 50: Clean Up Regularly • Check for
Page 52 and 53: Types of BoYlenecks Disk-‐Bou
Page 54 and 55: Measure Capacity • Disk size c
Page 56 and 57: Test Disk Health • Use smartct
Page 58 and 59: Service Interrup8ons • ALTER TAB
Page 60 and 61: Solu8ons for Upgrades • MySQL
Page 62 and 63: That was only 8 deadly sins!
Page 64 and 65: Thank You! • Please remember t

Deadly Sins of MySQL Operations

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