Search Components
When we configure the search in SharePoint
2013,we need to assign the roles and distribute the components in between the
servers, In this article I am explaining in detail the roles of the search
components.
Please go through the link
provided to know what are the components for search.
Crawl component
The crawl component crawls the content sources. You
can crawl a wide variety of content sources, for example file shares,
SharePoint content, line of business applications and many more. To retrieve
information, the crawl component connects to the content sources by invoking
the appropriate indexing connector or protocol handler. After retrieving the
content, the crawl component passes crawled items to the content processing
component.
Content processing component
The content processing component processes crawled
items and sends these items to the index component. The content processing
component performs operations such as document parsing and property mapping. It
also performs linguistics processing such as language detection and entity
extraction. The component transforms crawled items into artifacts that are
included in the search index. The content processing component also writes
information about links and URLs to the link database. In turn, the analytics processing
component writes information related to the relevance of these links and URLs
to the search index through the content processing component.
Analytics processing component
The analytics processing component analyzes crawled
items, which is referred to as search analytics, and how users interact with
search, which is referred to as usage analytics. Examples of search analytics
are links, anchor texts and metadata. An example of usage analytics is the
number of times an item is viewed. The analytics processing component analyzes
search analytics and usage analytics. Search analytics information is stored in
the link database and usage analytics information in the analytics reporting
database.
Index component
The index component is the logical representation of
an index replica. In the search topology, you have to provision one index
component for each index replica. The index component receives processed items
from the content processing component and writes those items to an index file.
Index files are stored on a disk in an index replica. The index component
receives queries from the query processing component and returns result sets.
You can divide the search index into discrete portions, called index
partitions. Each index partition holds one or more index replicas. The search
index is the aggregation of all index partitions.
Query processing component
The query component analyzes and processes queries and
results. When the query processing component receives a query, it analyzes and
processes the query to optimize precision, recall and relevance. The processed
query is submitted to the index component. The index component returns a result
set based on the processed query to the query processing component, which in
turn processes that result set, before returning it to the front-end.
Search administration component
The search administration component runs the system
processes for search. This component performs provisioning, which is to add and
initialize instances of the other search components.
Crawl database
The crawl database stores tracking information and
details about crawled items. For example, it stores information about the last
crawl time, the last crawl ID and the type of update during the last crawl.
Link database
The link database stores information extracted by the
content processing component. It also stores information about the number of
times people have clicked on a search result. The information is stored
unprocessed; the analytics processing component performs the analysis.
Analytics reporting database
The analytics reporting database stores the results of
usage analytics and extracts information from the link database when it is
required.
Search administration database
The search administration database stores search
configuration data and the access control list (ACL) for the crawl component.
There can be only one search administration database per search service
application.
Source from: http://www.c-sharpcorner.com/UploadFile/Roji.Joy/enterprise-search-configuration-in-sharepoint-2013/
Thanks to Destin for the great Article.
I hope the above information will help you to resolve the issue, in case of any queries/questions regarding the above mentioned information then please let me know. I would be more than happy to help you as well as resolves your issues, Thank you.
