Download e-book for kindle: Access 2003: World's Quick Reference Software Guide by John Hales, Inc. Barcharts

By John Hales, Inc. Barcharts

ISBN-10: 1572228016

ISBN-13: 9781572228016

Laminated speedy research consultant for entry 2003. comprises: Tables & Queries, New beneficial properties, Getting help,Standard Toolbar Icons, Terminology, Database items, Database Toolbar Icons, making a Database & tables, desk layout Toolbar, facts forms, universal box houses, basic keys, growing Queries, question layout View,Query layout Toolbar, question layout, Specifying standards, Viewing SQL Code,Common Keyboard shortcuts, and extra.

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This section will explore the various options we can tweak depending on our tolerance for event data loss. Write concern MongoDB has a configurable write concern. This capability allows you to balance the importance of guaranteeing that all writes are fully re‐ corded in the database with the speed of the insert. For example, if you issue writes to MongoDB and do not require that the database issue any response, the write operations will return very fast (since the application needs to wait for a response from the data‐ base) but you cannot be certain that all writes succeeded.

Deleting such an order, however, presents a problem. remove({'order_id': '11223'}) Of course, this can leave dangling order_items documents around if an exception occurs between the remove calls, and other processes can end up seeing orphaned order_items documents if they happen to query that collection between our operations. remove({'_id': '1123'}) Although this guarantees that we won’t have “garbage” items in our database, it also introduces the problem of having partially deleted orders, where some or all of the line items are deleted but the order itself remains.

It’s easy to miss a par‐ ticular failure scenario, and there are many opportunities to miss a race condition and introduce inconsistency into your data, by a small over‐ sight in design or a bug in implementation. As a rule of thumb, whenever it’s possible to structure your schema such that all your atomic updates occur within a document boundary, you should do so, but it’s nice to know you can still fall back to two-phase commit if you absolutely have to. A better approach to this problem is to emulate transactions in the data model.

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Access 2003: World's Quick Reference Software Guide by John Hales, Inc. Barcharts


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