PowerShell script for Create Content DB & attach site collection

Create Content DB
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New-SPContentDatabase "Test_sitecollection_Content"-DatabaseServer "sp2010sql_sys" -WebApplication "http://Test_WebApplication/"

Create site collection in  Content DB
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New-SPSite -URL "http://Test_WebApplication/sites/Test_sitecollection" -OwnerAlias "sureshkumar" -SecondaryOwnerAlias "admin1" -ContentDatabase "Test_sitecollection_Content"