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10 Cards in this Set
- Front
- Back
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3 Main techniques used in Page-Level Compression
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1. row-level data compression
2. prefix compression (repeating data within columns) 3. dictionary compression (repeating patterns in page) |
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4 Main techniques used in Row-Level Data Compression
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1. Reduce metadata used to store row
2. Store fixed length numerics as variable length 3. Store CHAR as variable length 4. Don't store NULL or 0 values |
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Which objects can be compressed in SQL 2008?
A. Table stored as heap B. table stored as clustered index C. non-clustered index D. indexed view E. Partitioned tables and indexes |
All listed: A,B,C,D,E
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Disadvantages of Backup Compression (2)
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1. Increased CPU utilization
2. If already using row/page compression heavily or using TDE, wont be much benefit to backup compression |
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T-SQL commands for turning on backup compression
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SP_CONFIGURE 'backup compression default',1
GO RECONFIGURE GO |
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Which SQL Versions support backup compression (backup? restore?)
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Only Enterprise allows compressing backups. All versions can restore a compressed backup.
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Which of the following are valid values for 'format /A:#'
A: 4096 B: 8K C: 16K D: 65536 |
A, C
values 16K and over use 'K' |
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Which parameter is necessary for formatting a volume which will store compressed filestream objects?
A: /C B: /c C: /compress D: All the above |
B
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T-SQL statement for limiting a query to using two processors
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OPTION (MaxDop 2)
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How do you set the Max DOP at the database instance level
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EXEC sp_configure 'show advanced option', '1'
RECONFIGURE GO sp_configure 'max degree of parallelism', 8 RECONFIGURE GO |
