what is difference between rebuild index and reorganize in sql server?
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REORGANIZE is a pure cleanup operation which leaves all system state as is. There are a number of differences. Basically, rebuilding is a total rebuild of an index - it will build a new index, then drop the existing one, whereas reorganising it will simply, well... it will reorganise it.
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System copy and system refresh are closely related. The main difference is that a system refresh updates the target system periodically with data from the source system, while a system copy builds a new system based on an existing system as the source.
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Both Clustered Index and Nonclustered Indexes have same physical structure in SQL Server. Both are stored as a B-Tree structure in SQL Server. A Table can have ONLY 1 Clustered Index. ... A Primary Key constraint can also be enforced by Nonclustered Index, You can specify the index type while creating Primary Key.
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As verbs the difference between restore and recover is that restore is to reestablish, or bring back into existence while recover is to get back, regain (a physical thing lost etc) or recover can be to cover again.
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Redundant data wastes valuable space and creates troubling database maintenance problems. To eliminate redundant data from your Microsoft Access database, you must take special care to organize the data in your data tables. Normalization is a method of organizing your data to prevent redundancy.
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A unique index is just an index with a unique constraint, nothing more, nothing less. A clustered index orders the data phsyically on the disk to match the index. It is useful if you access the data in the table very often via just one column, e.g. via the primary key.
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Because Windows Update is its own little program, components within can break and throw the entire process off of its natural course. Running this tool might be able to fix those broken components, resulting in a faster update the next time around.
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An index is a logical namespace which maps to one or more primary shards and can have zero or more replica shards. Ok. ... The second concept relates to replicas and shards, the mechanism Elasticsearch uses to distribute data around the cluster. Let's explore the first concept, using indices to organize data.
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In short, an upgrade refers to a SQL Server instance upgrade which will result in the upgrade of user and system databases. ... Migration, on the other hand, refers to moving of databases between instances of SQL Servers either on the same Version\Edition of SQL Server or upgraded Version\Edition of SQL Server.
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The difference between them is to change or not change head, stage (index), working directory. Git reset --hard will change head, index and working directory. Git reset --soft will change head only. ... But after that you still have the changes from bad commit in your index and working directory.
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1) When there is a clustered index on the table and the column to be queried, both the MAX() operator and the query SELECT TOP 1 will have almost identical performance. 2) When there is no clustered index on the table and the column to be queried, the MAX() operator offers the better performance.
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1) A Clustered Index physically sort all rows while Nonclustered Index doesn't. 2) In SQL, one table can only have one Clustered Index but there is no such restriction on NonClustered Index. 3) In many relational databases, Clustered Index is automatically created on the primary key column.
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2 Answers. They are completely different. git-reset works with refs, on your working directory and the index, without touching any commit objects (or other objects). git-rebase on the other hand is used to rewrite previously made commit objects.
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2 Answers. A "sort merge" join is performed by sorting the two data sets to be joined according to the join keys and then merging them together. ... A hash join is performed by hashing one data set into memory based on join columns and reading the other one and probing the hash table for matches.
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In SQL the putting together the records from different input files is called a join. A match-merge also puts together records from different input files. However, the match-merge and the join use two entirely different techniques of matching the records from the input files. ... As its name implies SQL is a query language.
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The Database Engine automatically modifies indexes whenever insert, update, or delete operations are made to the underlying data. For example, the addition of rows in a table may cause existing pages in rowstore indexes to split to make room for the insertion of new key values.
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An index is an on-disk structure associated with a table or view that speeds retrieval of rows from the table or view. ... These keys are stored in a structure (B-tree) that enables SQL Server to find the row or rows associated with the key values quickly and efficiently.