Reusing Column Buffers with Oracle and VW: Video
Today's Smalltalk Daily looks at reusing column buffers with Oracle (version 9 and up) with VisualWorks. This is an upcoming feature of VisualWorks, scheduled for VW 7.7.1. If you're looking for a particular topic, you can find it with the Media Search application on our site.
The code used is below; To watch, click on the viewer:
"Connect to an Oracle database." conn := OracleConnection new. conn username: 'username'; password: 'password'; environment: 'ORACLEDB'. conn connect. sess := conn getSession. "The default is false meaning not to reuse." sess reuseColumnBuffers: false. t1 := Time millisecondsToRun:[ " | conn sess ansStrm |" 100 timesRepeat: [ sess prepare: 'select * from sys.all_tables where TABLE_NAME=''DUAL'''. sess execute. ansStrm := sess answer. res := ansStrm upToEnd. ]. ]. Transcript cr; show: 'Time spent without reusing row buffers: ', t1 asFloat printString. "Set to reuse the column buffers." sess reuseColumnBuffers: true. t2 := Time millisecondsToRun:[ " | conn sess ansStrm |" 100 timesRepeat: [ sess prepare: 'select * from sys.all_tables where TABLE_NAME=''DUAL'''. sess execute. ansStrm := sess answer. res := ansStrm upToEnd. ]. ]. Transcript cr; show: 'Time spent with reusing row buffers: ', t2 asFloat printString.
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