JChem can be used in various multiuser configurations with different databases. However this versatility also means that the administrator of a JChem database should learn a few things about the property table.
The JChem property table contains information about JChem's tables, registration information and some details about the database. Simply, this table identifies a JChem "environment" or "configuration". There can be one or more property table for a database, located under the same or different schemas, if the database supports it. This means a lot of possibilities, the following sections describe some of the most useful ones.
This "multiuser" mode can be used for testing, or places where security is not an issue.
In this case there's only one property table and only one user name (for example "jcuser"), but several people log in with this username into the database and work simultaneously.
The database can be split into groups of tables: tables created using property table "jchemprop1" for example won't be accessible using "jchemprop2". Remember that every user can use any property table, so this is just for convenience and not for security.
In these cases the users get individual login names from the database administrator.
JChem relies on the security functions of the database software, because it provides better security than building these features into a high-level application. However, it also means that database administrators have to manage JChem users themselves. Note that there are differences between using certain databases.
We can categorize common databases into two categories: with and without schemas.
In these databases there is a common space for all users, so the solution is quite straightforward:
The database administrator provides access to the common single property table for all JChem users.
In these databases (like Oracle for example), the best solution is to create a special admin user (for example "jcadmin"). This user will own the property table, full access must be granted to all other users. This admin user might also own the common data tables and share them, although individual users have this ability too.