This document discusses databases and search engines. It provides definitions for databases as structured sets of data accessible in various ways that are stored in an organized manner using database management systems. Search engines are programs that search for and identify items in a database corresponding to specified keywords or characters. While databases and search engines have different purposes, they also share similarities like searching through large amounts of data, query processing, data loading, and data indexing.

1. Otherdatabases
What isdatabase?
Structuredsetof data heldina computer,especiallyone thatisaccessible invariousways. (Dicform)
Database is a data structure that storesinformationinanorganizedmanner.
Maximumnumberof databasescontainmultipletables.
Most of the sitesuse database managementsystem.
DBMS issoftware thathandlesthe storage,retrieval,andupdatingof dataina computersystem.
What isdatabase engines?
Database engine isanunderlyingsoftware componentthatadatabase managementsystem(DBMS)
usesto create,read,update anddelete (CRUD) datafroma database.
Searchengine:
A programthat searchesfor;and identifiesitemsinadatabase thatcorrespondto keywordsor
characters specifiedbythe user.
Why searchengine wasdeveloped.
The newfull- textdidnotfitwell intothe oldtable-style databases,therefore,the needfor
unstructuredfull-textsearchingwasobvious.
Some otherdifference betweendatabase andsearchengine.
Databases Searchengines
Database Collection,Document,Index orCatalog
Tables SegmentorPartition
Record Document,Page,URL, Record,Match or Hit
Index Collection, Full textindex
Field Field,Metadata
Technical Similarities betweendatabase andsearchengines
While relationaldatabase systemsandfull-textsearchenginesare optimizedtoprocess
fundamentallydifferenttypesof data,there are a numberof similaritiesbetweenthe two.
- Both can searchthroughlarge amountsof data
- QueryProcessing,ReturnMatchingRecords
- Data Loading
- Data Indexing
Glossarysection:
Data Load: is the processthat involvestakingthe transformeddataandloadingitwhere the users
can access it.

2. Index:analphabetical listof names,subjects,etc.withreference tothe pageson whichtheyare
mentioned.
Tables:setof facts or figuressystematicallydisplayed,especiallyincolumns.
Segments:eachof the parts intowhichsomethingisormaybe divided,
Metadata: a setof data that describesandgivesinformationaboutotherdata.
Data indexing:datastructure whichisusedtoquicklylocate andaccessthe data in a database table.
Data loading:Data Load isthe processthat involvestakingthe transformeddataandloadingit
where the userscan accessit.
Queryprocessing: QueryProcessingisatranslationof high-level queriesintolow-level expression.It
isa stepwise processthatcan be usedat the physical level of the file system, queryoptimization
and actual executionof the querytogetthe result.
Medline:Medical Literature AnalysisandRetrieval SystemOnline
Premierbibliographicdatabase thatcontainsmore than25 millionreferencestojournal articlesin
life scienceswith aconcentrationonbiomedicine.
MEDLINE isthe primarycomponentof PubMed®,partof the Entrezseriesof databasesprovidedby
the NLM National CenterforBiotechnologyInformation(NCBI).
Medline Medicine’sbibliographicdatabase coversthe fieldssuchas:
• Medicine
• Nursing
• Alliedhealth
• Pre-clinicalsciencesetc.
A distinctivefeature of MEDLINE
- Recordsare indexedwithNLMMedical SubjectHeadings(MeSH®).
- MeSH termsprovide aconsistentwayof retrievinginformationthatusesdifferent
terminologyforthe same concept.
Service Duration:
MEDLINE isthe online counterparttoMEDLARS® (MEDical Literature AnalysisandRetrieval System)-
originatedin1964.
Citations:
 From more than 5,200 worldwide journals.

3. Language:
 40 languages (recent)
 60 languages (forolderjournals)
Updates:
 Citationsare addedtoPubMed7 daysa week.
 More than 813,500 citationswere addedtoMEDLINE in 2017.
 Updatesare suspendedfortwoweeksduringNovemberasNLM makesthe transitiontoa
newyearof Medical SubjectHeadings(MeSH) vocabularyusedtoindex the articles.
The scope of Medline:
Availability:
MEDLINE isthe primarycomponentof PubMed.
Free searchlistof citations includingauthors,title,source,andoftenanabstract and journal articles.
Searchingisfree of charge and doesnot require registration.
Indicationof free electronicfull-textisavailable;followingthe citationscontainalinktothe free full
textof the article archivedinPubMedCentral® ortoothersites.
For articlesnotfreelyavailable onthe Web:
the "Loansome Doc®"feature inPubMedprovidesaneasywayto place an electronicorderthrough
the National Networkof Librariesof Medicine® (NN/LM®) forthe full-textcopy of anarticle citedin
MEDLINE; Registrationisrequiredandlocal feesmayapplyforthisservice.
Simple search:
- Go to webpage
- www.ncbi.nlm.nih.gov/pubmed/
- LimitPubmedsearchtoMedline only
- Searchfor full textresources –or -
- Use appropriate filterstonarrow downyoursearch
- You can clickadvancedsettingsandcreate a search builderbyselectingrequiredbuilder.
How to use MeSH inpubmed/Medline
- Go to www.pubmed.gov
- Go to MeSH
- Use
- Enter desiredtopicrelatedkeyword anditwill retrieve results.(mostrelevantheadings
wouldbe the firstthree or four)
- Clickingontermwill give more information
- Firstwill be the listof subheadings
- Secondisthe MeSH term higherkey(locatedatthe bottom)
- Addthe term at search builderandif youcannotfindanythinguseful ignore all
- Addmore terms at searchbar

4. - Addin searchbuilder
- Filterfurtherif requiredbyusingotheroptions
- Openthe desiredpage andyoucan furthercheckMeSH term at the below of the abstract
- Andthenadd inpubmedsearch
You can use MeSH at ovidmedline andproQuestmedline aswell. (Registration
required/affiliationwithaninstitute)
For any confusionthe youtube tutorial linkisonrighttopcornerat advancedpage to help
youassesthe searchengine.
Journal/publication selection criteria:
The great majorityof journalsare selectedforMEDLINEbasedon the recommendationof the
Literature SelectionTechnical ReviewCommittee (LSTRC)
Some additional journalsandnewslettersare selectedbasedonNLM-initiatedreviews.
MEDLINE PolicyonIndexingElectronicJournals
 Provide NLMwithXML-taggeddata of itsbibliographiccitations.
 Provide robustcurrentaccessto all of itscontent.
 Have an acceptable arrangementforpermanentpreservationof,andaccessto,the content.
 Andrulesfollowedbythe factsheetforselection
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