It minimizes the metadata column information, length, offsets, etc. Numeric data types and fixed length strings are stored in variable-length storage format, just like Varchar. Read more in the download. Page compression allows common data to be shared between rows for a given page.
It uses the following techniques to compress data:. For every column in a page, duplicate prefixes are identified. These prefixes are saved in compression information headers CI which reside after page headers. A reference number is assigned to these prefixes and that reference number is replaced wherever those prefixes are being used.
Dictionary compression searches for duplicate values throughout the page and stores them in CI. The main difference between prefix and dictionary compression is that prefix is only restricted to one column while dictionary is applicable to the complete page. Sign in Email. Forgot your password? Search within: Articles Quick Answers Messages. Tagged as SQL. Stats Please Sign up or sign in to vote. Read more in the download Page Compression Page compression allows common data to be shared between rows for a given page.
It uses the following techniques to compress data: Row compression Prefix Compression For every column in a page, duplicate prefixes are identified. Dictionary Compression Dictionary compression searches for duplicate values throughout the page and stores them in CI. Prior to joining Microsoft he was awarded Microsoft MVP award for three continuous years for his contribution in community.
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Each job may call any number of programs which individually update the database. Periodically, one of these programs may fail, so we want to put the database back to the state it was before any of the programs in the job ran. The only way I know how to do this is to backup the db prior to the job starting, or recover using the a prior backup the and associated log file.
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