what is the difference between query cache and second level cache?
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Difference: Query Cache's sole purpose is to cache the queries whereas Second Cache can be used to cache for other caches also. Query cache is provided by Hibernate internally whereas for Second level cache you have to choose some external second level cache such as Infinispan, EHCache etc.
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L1 cache, or primary cache, is extremely fast but relatively small, and is usually embedded in the processor chip as CPU cache. ... Level 3 (L3) cache is specialized memory developed to improve the performance of L1 and L2. L1 or L2 can be significantly faster than L3, though L3 is usually double the speed of DRAM.
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A CPU cache is a hardware cache used by the central processing unit (CPU) of a computer to reduce the average cost (time or energy) to access data from the main memory. A cache is a smaller, faster memory, located closer to a processor core, which stores copies of the data from frequently used main memory locations.
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- Set-associative mapping the cache is divided into a number of sets of cache lines; each main memory block can be mapped into any line in a particular set. ... For a direct-mapped cache , a main memory address is viewed as consisting of three fields.
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A register holds instructions or data that the processor is working on or will be working on shortly. They form part of the processor and are capable of holding only one item at a time. A cache memory is an area in the computer where codes and instructions are stored.
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L3 cache – CPU caches are like small batches of memory that the processor keeps close by to speed up certain applications. ... Only Xeon processors support ECC RAM. More cores, multi CPU options – If your applications require as many CPU cores as possible, Xeon is what you need.
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Clear your cache Periodically clearing your cache, or temporarily stored internet data, from your Google Chrome browser ensures that it functions efficiently, as an overloaded cache can considerably slog down browsing speeds. And fortunately, clearing your cache is a quick and easy process that takes seconds to do.
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A site cache saves certain types of content and is controlled client-side. A browser cache saves the same types of content, and is saved on your computer, through your browser, and is controlled by the browser.
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Nested Subqueries Versus Correlated Subqueries : With a normal nested subquery, the inner SELECT query runs first and executes once, returning values to be used by the main query. A correlated subquery, however, executes once for each candidate row considered by the outer query.
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With Eager Loading, all the data is retrieved in a single query, which can then be cached to improve the Application performance. With Eager Loading, we are trading memory consumption for the database round trips. With Lazy Loading, we only retrieve just the amount of data, which we need in a single query.
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What is the browser cache? The browser requests some content from the web server. If the content is not in the browser cache then it is retrieved directly from the web server. If the content was previously cached, the browser bypasses the server and loads the content directly from its cache.
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The application-level caching in Drupal ensures that the cached pages are separately stored from the site content (which goes into the database). You can't set this up, except for guiding Drupal where to save cached pages explicitly.
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['Query Decomposition. The first layer decomposes the calculus query into an algebraic query on global relations. ... ', 'Data Localization. The input to the second layer is an algebraic query on global relations. ... ', 'Global Query Optimization. The input to the third layer is an algebraic query on fragments. ... ', 'Distributed Query Execution.']
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The main difference between get() vs load method is that get() involves database hit if an object doesn't exist in Session Cache and returns a fully initialized object which may involve several database calls while load method can return proxy in place and only initialize the object or hit the database if any method ...
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Difference between static cache and dynamic cache? If you cache the lookup table, you can choose to use a dynamic or static cache. By default, the lookup cache remains static and does not change during the session. With a dynamic cache, the Informatica Server inserts or updates rows in the cache during the session.
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Cookie is used to store information to track different characteristics related to user, while cache is used to make the loading of web pages faster. Cookies stores information such as user preferences, while cache will keep resource files such as audio, video or flash files.
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Memory cache is stored on RAM, which is faster to write and access, but will be wiped out when the computer turns off or in certain other situations. Disk cache is written to the hard drive, which is slower to read and write, but it will stay on the disk.