By Dennis Shasha, Philippe Bonnet
Tuning your database for optimum functionality capacity greater than following a number of brief steps in a vendor-specific advisor. for max development, you would like a large and deep wisdom of uncomplicated tuning rules, the facility to assemble information in a scientific manner, and the ability to make your method run quicker. this can be an artwork in addition to a technological know-how, and Database Tuning: rules, Experiments, and Troubleshooting concepts can assist you increase moveable talents that might let you song a wide selection of database structures on a mess of and working structures. additional, those abilities, mixed with the scripts supplied for validating effects, are precisely what you want to review competing database items and to decide on the fitting one.
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Extra info for Database tuning principles, experiments, and troubleshooting techniques
Further, different reads by a single transaction to the same data will not be repeatable, that is, they may return different values. Writes may overwrite the dirty data of other transactions. A transaction holds a write lock on x while writing x , then releases the lock immediately thereafter. 2. Degree 1 read uncommitted: Reads may read dirty data and will not be repeatable. Writes may not overwrite other transactions’ dirty data. 3. Degree 2 read committed: Reads may access only committed data, but reads are still not repeatable because an access to a data item x at time T2 may read from a different committed transaction than the earlier access to x at T1 .
The two-phase condition should apply to reads as well as writes. ) give a default behavior in which write locks are held until the transaction completes, but read locks are released as soon as the data item is read (degree 2 isolation). This example shows that this can lead to faulty behavior. This means that if you want concurrent correctness, you must sometimes request nondefault behavior. 2 Lock Tuning Lock tuning should proceed along several fronts. 1. Use special system facilities for long reads.
TEAM LinG - Live, Informative, Non-cost and Genuine! 38 CHAPTER TWO Tuning the Guts survive power failures. Such media are called durable. As a second step, in order to survive failures of durable media, such as disk crashes, the data must be replicated on several units of durable media, such as redundant disks. Achieving transaction atomicity Algorithms to achieve transaction atomicity are based on two simple principles. 1. Before a given transaction commits, it must be possible to undo the effects of that transaction, even if random access memory fails.