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Lepinsky on PL/SQL Performance

Oracle developer expert Roger Lepinski has published an outstanding document on PL/SQL tuning tips:

 

http://home.earthlink.net/~rodger22/RLHighSpeedPLSQL.pdf 

 

In this, he lists several “principles” for high-speed PL/SQL:

 

PRINCIPLE NUMBER ONE - HARD DRIVES ARE SLOW

 

• Yet, so many developers worry about trimming lines

from their source code, but never reduce reads to the

hard drives.

 

• At best, this can only give marginal increases in

speed.

 

• When tuning SQL or PLSQL, always try to reduce the

number of reads to the hard drive.

 

PRINCIPLE NUMBER TWO - FOR PERFORMANCE, PUT THE HEAVY WORK ONTO THE DATABASE SERVER.

 

• Avoid dragging lots of data into the client and doing

the processing there.

 

• This principle still applies to java.

 

• Object layer population times 

 

PRINCIPLE THREE: READ THE DATA ONCE

 

• Avoid nested loops retrieving small amounts of data.

 

• The faster method is to read the data en masse.

 

• Retrieve everything in one big SQL query or cursor..
 


 

 
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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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