Oracle
1Z0-888 · Question #11
1Z0-888 Question #11: Real Exam Question with Answer & Explanation
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Performance Tuning
Question
After analysis on the slow query log on a high-end OLTP service, the table identified in the slow queries is: CREATE TABLE transactions ( User VARCHAR (255) NOT NULL, Amount DECIMAL (16,2) NOT NULL, Date DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP () ENGINE=MyISAM; What are the two most likely reasons for the slowness given this output?
Options
- AThe Date should be a TIMESTAMP field for better performance.
- BThe User field is too long for most names.
- CThe engine type is not appropriate to the application use.
- DUsing default values for DATETIME causes table scans.
- ENo indexes are defined.
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Topics
#Schema Design#Storage Engines#OLTP Performance#Data Types