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ha_berkeley.cc source files. You can also find information in the online reference manual.
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Simply adding transaction support using the MySQL mechanisms is not the end of the story. Storage engines that use indexes8 must provide mechanisms to permit transactions. These operations must be capable of marking nodes that have been changed by operations in a transaction, saving the original values of the data that has changed until such time that the
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8. For the record, it is possible to have a stage 6 engine that does not support indexes. Indexes are not required for transaction processing. However, uniqueness should be a concern and performance will suffer.
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CHAPTER 7 BUILDING YOUR OWN STORAGE ENGINE
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transaction is complete. At this point, all of the changes are committed to the physical store (for both the index and the data). This will require making changes to the Spartan_index class. Clearly, implementing transactions in a pluggable storage engine requires a lot of careful thought and planning. I strongly suggest if you are going to implement transactional support in your storage engine that you spend some time studying the BDB and InnoDB storage engines as well as the online reference manual. You may even want to set up your debugger and watch the transactions execute. Whichever way you go with your implementation of transactions, rest assured that if you get it working you will have something special. There are few excellent storage engines that support transactions and none (so far) that exceed the capabilities of the native MySQL storage engines.
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In this chapter, I ve taken you on a tour of the pluggable storage engine source code and showed you how to create your own storage engine. Through the Spartan storage engine, you learned how to construct a storage engine that can read and write data and that supports concurrent access and indexing. Although I explain all of the stages of building this storage engine, I leave adding transactional support for you to experiment with. I have also not implemented all of the possible functions of a storage handler. Rather, I implemented just the basics. Now that you ve seen the basics in action and had a chance to experiment, I recommend studying the online documentation and the source code while you design your own storage engine. If you found this chapter a challenge, it s OK. Creating a database physical storage mechanism is not a trivial task. I hope you will come away from this chapter with a better understanding of what it takes to build a storage engine and a proper respect for those MySQL storage engines that implement indexing and transaction support. Neither of these tasks are trivial endeavors. Finally, I must tell you that I have seen several areas of improvement for the data and index classes I have provided. While the data class seems fine for most applications, the index class could be improved. If you plan to use these classes as a jumping-off point for your own storage engine, I suggest getting your storage engine working with the classes as they are now and then going back and either updating or replacing them. There are several areas in particular I recommend updating in the index class. Perhaps the most important change I recommend is changing the internal buffer to a more efficient tree structure. There are many to choose from, like the ubiquitous B-tree or hash mechanism. I also suggest that you change the way the class handles range queries. Lastly, there are several changes that need to be made to handle transaction support. The class needs to support whatever buffer mechanism you use to handle commits and rollbacks. In the next chapter, I ll examine one of the more popular extensions of the MySQL system. This includes adding your own user-defined functions (UDFs), extending an existing SQL command, and adding your own SQL commands to the server. These techniques permit the MySQL system to evolve even further to meet your specific needs for your environment.
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