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http://viralpatel.net/blogs/oracle-index-skip-scan/ in 11g the same sql use index skip scan but in 10g it use index rang scan ,it seem the same sql ,1 阅读全文
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SQL TYPE 1:for bind value sql , first create a good plan with literal and with good profile. then use sqlT to replace the profile‘’s good plan to bind 阅读全文
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3. When lowering the value of COMPATIBLE: You cannot start the database with lower compatibility, unless restoring from a backup. This is because data 阅读全文