Optimizing SQL Insert Performance - GSE Belux
Optimizing SQL Insert Performance - GSE Belux
Optimizing SQL Insert Performance - GSE Belux
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MAXROWS n<br />
• Optimisation to avoid wasteful space search on partitioned tablespace in fixed<br />
length compressed and true variable length row insert<br />
• Must carefully estimate ‘average’ row size and how many ‘average’ size rows will<br />
fit comfortably in a single data page<br />
• When MAXROWS n is reached the page is marked full and out of space search<br />
• But introduces on going maintenance challenges<br />
– Could waste space?<br />
– What happens if compression is removed?<br />
– What happens if switch from uncompressed to compressed?<br />
– What happens when new columns are added?<br />
22<br />
© 2010 IBM Corporation
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