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 Sybase  |  Question 52 of 59    Print  
Update Statistics
Explain What is Update Statistics?


  
Total Answers and Comments: 2 Last Update: May 13, 2008     Asked by: srihari_d 
  
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March 26, 2008 00:13:46   #1  
wramakrishna Member Since: March 2008   Contribution: 1    

RE: Update Statistics
The update statistics command helps the server make the best decisions about which indexes to use when it processes a query, by providing information about the distribution of the key values in the indexes.   The update statistics commands create statistics, if there are no statistics for a particular column, or replaces existing statistics if they already exist. The statistics are stored in the system tables systabstats and sysstatistics.
 
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May 09, 2008 07:05:19   #2  
Rashmi121 Member Since: May 2008   Contribution: 2    

RE:
ASE uses two system tables for maintaining stats on tables for obtimized query and data retrival.
systabstats is used on table level and is maintained dynamically while sysstatistics maintains information on columns and is not maintained.Update statistcis is used to update the information in system tabels for ASE use.It shoudl be run in off-peak hours.

 
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 Related Questions

Latest Answer : Deferred updates are carried out by adaptive server. Generally in deferred updates the affected rows are analyzed and further updations needed on these rows are carried out by the adaptive server. In the process of deferred updates the log record is analyzed ...
Read Answers (1) | Asked by : keerthv

Explain What is Update Statistics? 
Latest Answer : ASE uses two system tables for maintaining stats on tables for obtimized query and data retrival.systabstats is used on table level and is maintained dynamically while sysstatistics maintains information on columns and is not maintained.Update statistcis ...


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