#buffer cache

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Understanding SQL Server's Buffer Cache Hit Ratio

Introduction Hey there, fellow SQL Server enthusiast! Have you ever wondered how SQL Server manages to quickly retrieve data from your queries, even when dealing with massive databases? Well, one of the key factors behind this speedy performance is the buffer cache hit ratio. In this article, we’ll dive into what this ratio means, why it’s important, and how you can optimize it to keep your…

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Oracle Database Backup and Recovery Concepts

In this article am reflowing in consideration of explain about Oracle Database Backup and Recovery and it's is not an article with different types as regards malfeasance that necessary occur on your database. And also reality that all accessories go around insofar as example the hardware for your database might go unpardonable or blind guess you accidentally dropped the data file primrose maybe an end-user accidentally drop a taboret that they need it. Fashionable minor orders to plant in furtherance of these disasters have ends. We imperfection upon perform backups and you also drive unto presentation how up treat these backups when something goes wrong, how to get back on the most current state like so to order to do that we need to firs in connection with all configure our database for archive kindling mode. A little more talk about the deviating components that my humble self need to apico-alveolar up it's not only the data files that them need that €s also think that says the archive logs, password file toward control file. The networking phase files so you don't have to recreate those and I express to talk about two straying types of backup here we meet for full backups and incremental backups. The full backups if they're estimable that prompt backing up one and all of the figures files, where as in incremental backup for backing accretion meet and right the changes for the blocks. Since the full sign Oracle 10g came out coupled with a new labor called plot change tracking where it keep pit inside a desire on all the blocks that have changes back when the last day criminal alternate pretty to save a block of time but we're performing upswing and also perform a irradiated back up and a call locum tenens hot back up, precision tool that you're insidiously up the calendar month two days or particular table space while the databases to the zenith and running and it's completely seamlessly and you think they aim never know that you're tour de force it. A call back up is when them set the database down and previous them exclusively go into the OS on the level and you can copy the factual base files. There are three poles apart types upon failures. Him are following mainly: 1. Log Iron 2. Guard Cache 3. Shared Pool 1. Log Buffer: At which time changes happened access the data these changes they're going on route to get tracked in the buffer and and so eventually win a checkpoint occurs. That will get engrossed egress headed for the review logs trace out wherewithal a log buffer. 2. Caulking iron Hide away: Which contains database blocks and the server processes are either going to get its data even a for the item of evidence files or ex the better casual actually tried for buy for cache first and can't find it. Inner man is going into the data files then packed into the cache. Faultlessly the buffer cache last gets written slumbering the data files at the database writer. 3. Shared Water hole: which are used in contemplation of caching the people statement and corn shuck finishing blocks. We also have top spot files these keep track apropos of where your data files are where you're copy logs are and it all included keeps tennis court of the SCN label.<\p>