Test Db as subset of big production DB
Hello, I need to create a test DB from a large production DB (over 2TB). I am looking for a way to get a random spread of records from the tables of production DB to use in test (less than 1TB). I am considering BCP, some sort of select into (two separate servers with access to/from). Trying to find the method with the least impact on production. Any ideas would be appreciated. Thanks, rick_806
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rick_806
8/19/2008 3:01:54 PM
sybase.ase.administration
7058 articles. 
2 followers.
3 Replies
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On Aug 19, 8:01=A0pm, rick_806 wrote: > Hello, > > I need to create a test DB from a large production DB (over > 2TB). I am looking for a way to get a random spread of > records from the tables of production DB to use in test > (less than 1TB). I am considering BCP, some sort of select > into (two separate servers with access to/from). Trying to > find the method with the least impact on production. Any > ideas would be appreciated. > You can try creating views with "where" conditions on primary key columns so that only subset of records are selected and bcp out those recods from view and bcp in into test server. -HTH Manish Negandhi [TeamSybase]
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Manish
8/19/2008 3:22:24 PM
rick_806 wrote: > Hello, > > I need to create a test DB from a large production DB (over > 2TB). I am looking for a way to get a random spread of > records from the tables of production DB to use in test > (less than 1TB). I am considering BCP, some sort of select > into (two separate servers with access to/from). Trying to > find the method with the least impact on production. Any > ideas would be appreciated. > > Thanks, > rick_806 One approach to get a reasonable distribution of data might be to use optdiag to extract the statistics for the table, then parse out from that file the primary key values for each step. From those values, generate a series of select statements select top <n> * from table where <primarykey> > <value> <n> would be sized by how much data you wanted. You could create a proxy table on the test box that maps to the real table and do the series of "insert <localtesttable> select top <n> * from <proxytable> where <primarykey> > <value>" as an easy way to move the data across. Another approach would be to come up with some kind of hashing/filter function, build a view based on that, and bcp out of the view. For instance, to bcp out about 1/3rd of the values from prod table, assuming a numeric primary key and even distribution of primary key values create view bcpoutview as select * from productiontable where primarykey % 3 = 1 go
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Bret
8/19/2008 3:29:52 PM
Hi, Thanks for the ideas. I will try it with a view. > On Aug 19, 8:01=a0pm, rick_806 wrote: > > Hello, > > > > I need to create a test DB from a large production DB > > (over 2TB). I am looking for a way to get a random > > spread of records from the tables of production DB to > > use in test (less than 1TB). I am considering BCP, some > > sort of select into (two separate servers with access > > to/from). Trying to find the method with the least > > impact on production. Any ideas would be appreciated. > > > You can try creating views with "where" conditions on > primary key columns so that only subset of records are > selected and bcp out those recods from view and bcp in > into test server. > > -HTH > Manish Negandhi > [TeamSybase]
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rick_806
8/20/2008 11:04:29 PM
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