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For a single application, for example, it s not uncommon to see base tables in one schema, code in another schema, and metadata or summary data in a third schema Isolating these might allow procedural code updates to the code schema to be done without significant (if any) impact on the other schemas Likewise, building new summary data structures would have little impact on the procedural and data schemas And, finally, backups may be more frequently done on the data schema as the data probably changes more often than do the procedural and code structures It s not our intent here to illustrate all the possible ways or possible reasons (barring the security reason) to separate objects into different schemas Architecture and application design and implementation is as much an art as it is a science The important point conveyed here is not so much stating the laws on how to organize schemas, but that you should apply a functional and logical organization to your schemas
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You should understand security implications associated with schemas, as this is critical to ensuring a secure application design and implementation It s important that we point out that no objectlevel security within a database schema guards itself from itself The schema owner has full access to all the objects within the schema It may sound a bit ridiculous to say this, because, naturally, that is why you may decide to co-locate the objects, code, and so forth The obvious interrelationships and interactions among objects that are necessary for the application to work need to exist without security barriers It is a fairly common worst practice to allow users general application users in this reference to log into the object owner accounts (that is, the schemas where the objects reside) When this is done, the thinking is usually that the application code will protect the objects from any malicious or malevolent user intent It is most often done to expedite development and minimize execution errors that may arise from an incorrectly or improperly configured database Unfortunately, there is no way to distinguish between an improper configuration and a genuine security exception until it happens NOTE It is a bad practice to allow general application users to connect directly to the schema that owns the objects This is a bad practice for several reasons First and foremost, when users are executing within the object owner s schema, no database security will prevent users from having their way with the data or the data structures (recognizing that fine-grained access controls do provide a safety net here, but the point is still valid) Second, as stated earlier, you want layers of security Turning off the database access security by way of improper design creates a huge risk As you can see in Figure 1-1 for a Sales History (SH) schema, you should not allow application users to connect to the database by way of the SH schema If you do, nothing in the database will prevent users from mutilating the data structures and basically having their way with everything contained within the SH Obviously, your application would need to provide some sort of security, but even with some security present, allowing user to access the database via the schema is a bad idea
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User access accounts are the schemas in which end users connect to the database These user connections generally occur in one of two ways: The users may be directly connected to the database via a program such as SQL*Plus, or the users may be connected via an application,
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FIGURE 1-1 A security worst-practice is to allow application users to connect directly to the schema that contains the data structures, objects, and code of the application
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typically running through an application server that is utilizing some form of connection pool, connection sharing, and/or connection cache For simplicity, consider only that from the database s perspective, the end user is connected to a schema
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