Executive's Guide to Web Services by Eric A. Marks PDF

By Eric A. Marks

ISBN-10: 0471266523

ISBN-13: 9780471266525

The idea of this e-book is that the adoption of net providers aren't in accordance with the need to enforce a "new technology," yet fairly at the technology's skill to bring strategic enterprise worth.

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PostgreSQL-based sharding PostgreSQL cannot shard data out of the box, but it has all the interfaces and means required to allow sharding through add-ons. One of these add-ons, which is widely used, is called PL/Proxy. It has been around for many years, and offers superior transparency as well as good scalability. It was originally developed by Skype to scale up their infrastructure. The idea behind PL/Proxy is basically to use a local virtual table to hide an array of servers making up the table.

The goal is to run a transaction inserting a single row. If a crash happens shortly after COMMIT, no data will be in danger because nothing has happened. Even if a crash happens shortly after the INSERT statement but before COMMIT, nothing can happen. The user has not issued a COMMIT command yet, so the transaction is known to be running and thus unfinished. If a crash occurs, the application will notice that things were unsuccessful and (hopefully) react accordingly. Also keep in mind that every transaction that is not committed will eventually end up as ROLLBACK.

However, we simply want to point out that performance is not the only component in the bigger picture. [ 38 ] Chapter 2 All the way to the disk To understand issues related to data loss and consistency, we have to see how a chunk of data is sent to the disk. The following diagram illustrates how this happens: When PostgreSQL wants to read or write a block, it usually has to go through a couple of layers. When a block is written, it will be sent to the operating system. The operating system will cache the data and perform some operation on it.

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Executive's Guide to Web Services by Eric A. Marks

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