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There s a lot of misinformation and confusion surrounding the proper management of permissions in OS X Discussions on the topic have been fairly heated since the migration to OS X from OS 9, which had very loose capabilities for delegating, assigning, and managing access to files and folders OS X, in contrast, was a native multiuser OS and, as such, permission-based restrictions were, and still are, at its heart and soul From a security perspective, file system permissions are your data s first line of defense in a multiuser environment A well-managed permission scheme ensures that your data is accessible and modifiable only by the proper people The file system, after all, is the gateway to your data An ineffective permission scheme is the equivalent of handing your data out to anyone who would express interest in it, or even worse, allowing them to destroy it.

BEGIN:VCALENDAR VERSION:2.0 BEGIN:VEVENT SUMMARY:Mom s Birthday Breakfast DTSTART:20100610T060000Z DTEND:20100610T070000Z END:VEVENT END:VCALENDAR

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In the first use, we include the entity reference to the CustomerType entity This is on the one side of the one-to-many association In the second use of Include(), we get the many side of the one-to-many association bringing along all the instances of the CustomerEmail entity for the customer By using the Include() method twice, we pull in all the referenced entities from both of the Customer s navigation properties To get the object graph from the CustomerType, we invoke Include() just once, but this time we pass in a path that includes both the Customers and the CustomerEmails Both of these queries resulted in a load of the entire object graph into the object context In our example, this wasn t much, but for databases with thousands or millions of customers, we could end up using lots of memory if we re not careful.

Furthermore, poorly implemented permissions can serve a different evil, preventing honest, hardworking Joe from accessing either his own documents or documents created by his collaborators Thus, file system permissions covers the triad of information security: confidentiality (ensuring your sensitive data isn t viewed by the wrong eyes), integrity (ensuring that data isn t manipulated by unwanted parties), and accessibility (ensuring that the right parties can access data consistently and reliably) This is no light matter: a small change to permissions on a directory toward the top of your file system hierarchy can have wide-sweeping effects in all three areas Suddenly, that chmod R 777 command that you read about online and are about to run might not seem like a good idea, and it probably isn t (if you don t understand what this means, don t worry, you will by the end of this chapter).

The Include() method has some important performance implications On the one hand, loading a large part of the object graph into the object context (that is, into memory), can end up using a lot of memory If we had millions of customers, this would definitely be a problem On the other hand, the Include() method loads the object graph in one trip to the database If your application will end up loading each entity in the graph separately, requiring lots of trips to the database, you may end up with a lot less database traffic with the use of the Include() method There is one more performance issue To get everything in one trip to the database, Entity Framework might construct a rather unwieldy SQL statement with lots of joins The SQL statement from our first query is shown in Listing 5-2.

Different calendaring programs have long had trouble with importing and exporting each other s calendar events, although the situation has improved in recent years. Despite the existence of a standard, different programs have added their own quirks, and some are better at dealing with those quirks than others. If your app is going to share calendar

Too many environments take a lax view on file system permissions simply because it s easier to not have to deal with them Unfortunately, many people don t realize the importance of data security until they have to reassemble the damage caused by poorly managed permissions on vulnerable data In this chapter, we will cover the ins and outs of file system discretionary access controls provided by Mac OS X version 106 Specifically, we will cover techniques utilizing all of Snow Leopard s tools (graphical and command line) to help ensure that your data is accessible by those who need to access it, and safe from manipulation by those who don t..

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