Generally salts of the 2A or alakaline earth metals tend to be more soluble as it go down the group.
Therefore we can summarize it as:
Ra salts> Ba salts> Sr salts> Ca salts> Mg salts> Be salts
The results can be related to its electronegativity. Barium salts are the most ionic form of group 2A salts. Size matters as well, the larger the metal ion it is the more polarizable the molecule.
Hope this helps :)