Although neither Na + nor Cs + is in contact with the solid surface, they show ion-specific behavior. Cl − strongly adsorbs onto the silica surface. The results clearly support the existence of ion-specific effects under confinement, which can be explained by the properties of interfacial water. All simulations were conducted for 250 ns to capture the dynamics of ion adsorption and to obtain the equilibrium distribution of multiple ionic species (Na +, Cs +, and Cl −) within the pores. The only way to ensure the creation of new data storage objects on FG1 or FG2 without any additional consideration is to set the required filegroup as shown below.All-atom molecular dynamics simulations were employed for the study of the structure and dynamics of aqueous electrolyte solutions within slit-shaped silica nanopores with a width of 10.67 Å at ambient temperature.
It is essential to provide explicit instructions for creating the data storage objects in other than the default filegroup. If we want to create a data storage object in FG1 or FG2 then the only way is to specify the filegroup when creating the storage object.Ĭonsider the following scenario where we want to create a table without specifying the filegroup. Any new table or index will be created in the primary filegroup which is the default unless we specify the filegroup to use. SELECT groupName AS FileGroupName FROM sysfilegroupsĪt this point we have three file groups primary, FG1 and FG2 in our new database. IF exists (SELECT * FROM sys.databases WHERE NAME = 'MSSQLTip')ĪLTER DATABASE MSSQLTip ADD FILEGROUP FG1ĪLTER DATABASE MSSQLTip ADD FILEGROUP FG2
Script 1: Create DB and add additional file group So in this case, the primary filegroup will be the default filegroup. Although additional filegroups can be created when creating a database, I added the filegroups later for simplicity and illustration. The following script creates a database and then adds additional filegroups.
Let's analyze the problem for which we are required to change the default filegroup from primary to something else. When you have multiple filegroups, changing the default filegroup from PRIMARY to another one is a good idea, because it eliminates the need to specify the filegroup when objects are created and makes sure that new objects are created in the correct filegroup. However we can change the default filegroup to any other filegroup at any time. Note: only one filegroup at a time can be the default filegroup.īy default, the primary filegroup is the default filegroup, so all new objects are placed in this filegroup. When a table or index is created without specifying a filegroup, all pages will be allocated from the default filegroup. So based on this when creating a new database, the primary file group of a database is the default filegroup and the primary data file is created in it.
Filegroup - this is a container that is made up of one or more files to store database objects.File - a physical file that is used to store database objects or transaction logs.Database - is made up of multiple files for database objects and transaction logs.Before we get started, let me explain some terminology:
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