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pg_xlogdump
Name
pg_xlogdump—Displayahuman-readablerenderingofthewrite-aheadlogofaPostgreSQL
databasecluster
Synopsis
pg_xlogdump
[
option
...][
startseg
[
endseg
]]
Description
pg_xlogdump
displaysthewrite-aheadlog(WAL)andismainlyusefulfordebuggingoreducational
purposes.
Thisutilitycanonlyberunbytheuserwhoinstalledtheserver,becauseitrequiresread-onlyaccess
tothedatadirectory.
Options
Thefollowingcommand-lineoptionscontrolthelocationandformatoftheoutput:
startseg
Startreadingatthespecifiedlogsegmentfile.Thisimplicitlydeterminesthepathinwhichfiles
willbesearchedfor,andthetimelinetouse.
endseg
Stopafterreadingthespecifiedlogsegmentfile.
-b
--bkp-details
Outputdetailedinformationaboutbackupblocks.
-e
end
--end=
end
Stopreadingatthespecifiedlogposition,insteadofreadingtotheendofthelogstream.
-f
--follow
AfterreachingtheendofvalidWAL,keeppollingoncepersecondfornewWALtoappear.
-n
limit
--limit=
limit
Displaythespecifiednumberofrecords,thenstop.
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pg_xlogdump
-p
path
--path=
path
Directoryinwhichtofindlogsegmentfiles.Thedefaultistosearchfortheminthe
pg_xlog
subdirectoryofthecurrentdirectory.
-r
rmgr
--rmgr=
rmgr
Onlydisplayrecords generatedbythespecifiedresourcemanager.If
list
ispassedasname,
printalistofvalidresourcemanagernames,andexit.
-s
start
--start=
start
Logpositionatwhichtostartreading.The defaultis tostartreadingthefirstvalidlogrecord
foundintheearliestfilefound.
-t
timeline
--timelime=
timeline
Timelinefromwhichtoreadlogrecords.Thedefaultistousethevaluein
startseg
,ifthatis
specified;otherwise,thedefaultis1.
-V
--version
Printthepg_xlogdumpversionandexit.
-x
xid
--xid=
xid
OnlydisplayrecordsmarkedwiththegivenTransactionId.
-?
--help
Showhelpaboutpg_xlogdumpcommandlinearguments,andexit.
Notes
Cangivewrongresultswhentheserverisrunning.
Onlythespecifiedtimelineisdisplayed(orthedefault,ifnoneisspecified).Recordsinothertimelines
areignored.
See Also
Section29.5
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VB.NET PDF Library SDK to view, edit, convert, process PDF file
Feel free to define text or images on PDF document and extract accordingly. Capable of adding PDF file navigation features to your VB.NET program.
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Appendix H. External Projects
PostgreSQL is a complex software project, and managing the project is difficult. We have found
thatmanyenhancementstoPostgreSQLcanbemoreefficientlydevelopedseparatelyfromthecore
project.
H.1. Client Interfaces
ThereareonlytwoclientinterfacesincludedinthebasePostgreSQLdistribution:
libpq is included becauseitis the primary Clanguage interface,andbecause many other client
interfacesarebuiltontopofit.
ECPGisincludedbecauseitdependsontheserver-sideSQLgrammar,andisthereforesensitive
tochangesinPostgreSQLitself.
Allotherlanguageinterfacesareexternalprojectsandaredistributedseparately.TableH-1includesa
listofsomeoftheseprojects.Notethatsomeofthesepackagesmightnotbereleasedunderthesame
licenseasPostgreSQL.Formoreinformationoneachlanguageinterface,includinglicensingterms,
refertoitswebsiteanddocumentation.
TableH-1.ExternallyMaintainedClientInterfaces
Name
Language
Comments
Website
DBD::Pg
Perl
PerlDBIdriver
http://search.cpan.org/dist/DBD-
Pg/
JDBC
JDBC
Type4JDBCdriver
http://jdbc.postgresql.org/
libpqxx
C++
New-styleC++
interface
http://pqxx.org/
Npgsql
.NET
.NETdataprovider
http://www.npgsql.org/
pgtclng
Tcl
http://sourceforge.net/projects/pgtclng/
psqlODBC
ODBC
ODBCdriver
https://odbc.postgresql.org/
psycopg
Python
DBAPI2.0-compliant
http://initd.org/psycopg/
H.2. Administration Tools
ThereareseveraladministrationtoolsavailableforPostgreSQL.ThemostpopularispgAdminIII
1
,
andthereareseveralcommerciallyavailableonesaswell.
1. http://www.pgadmin.org/
2930
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Create new page to PDF document in both ASP.NET web server-side application and .NET Windows Forms. Support adding PDF page number.
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AppendixH.ExternalProjects
H.3. Procedural Languages
PostgreSQL includes several procedural languages withthe base distribution: PL/pgSQL,PL/Tcl,
PL/Perl,andPL/Python.
Inaddition,therearea numberofprocedurallanguages thataredevelopedandmaintainedoutside
thecorePostgreSQL distribution.TableH-2lists someofthesepackages.Note thatsomeofthese
projectsmightnotbereleasedunderthesamelicenseasPostgreSQL.Formoreinformationoneach
procedurallanguage,includinglicensinginformation,refertoitswebsiteanddocumentation.
TableH-2.ExternallyMaintainedProceduralLanguages
Name
Language
Website
PL/Java
Java
https://github.com/tada/pljava
PL/PHP
PHP
http://www.commandprompt.com/community/plphp/
PL/Py
Python
http://python.projects.postgresql.org/backend/
PL/R
R
http://www.joeconway.com/plr/
PL/Ruby
Ruby
http://raa.ruby-
lang.org/project/pl-ruby/
PL/Scheme
Scheme
http://plscheme.projects.postgresql.org/
PL/sh
Unixshell
https://github.com/petere/plsh
H.4. Extensions
PostgreSQLisdesignedtobeeasilyextensible.Forthisreason,extensionsloadedintothedatabase
can functionjust like features that are built in. The
contrib/
directory shippedwith the source
codecontainsseveralextensions,whicharedescribedinAppendixF.Otherextensionsaredeveloped
independently,likePostGIS
2
.EvenPostgreSQLreplicationsolutionscanbedevelopedexternally.For
example, Slony-I
3
is apopularmaster/standbyreplicationsolutionthatis developedindependently
fromthecoreproject.
2. http://postgis.net/
3. http://www.slony.info
2931
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VB.NET PDF: VB Code to Create PDF Windows Viewer Using DocImage
PDF page in many ways, like adding rectangle, line view, annotate, process, save and scan images (supporting JPEG and BMP) and document files (TIFF, PDF and Word
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Appendix I. The Source Code Repository
ThePostgreSQLsourcecodeisstoredandmanagedusingtheGitversioncontrolsystem.Apublic
mirrorofthemasterrepositoryisavailable;itisupdatedwithinaminuteofanychangetothemaster
repository.
Ourwiki,http://wiki.postgresql.org/wiki/Working_with_Git, has some discussion on workingwith
Git.
NotethatbuildingPostgreSQLfromthesourcerepositoryrequiresreasonablyup-to-dateversionsof
bison,flex,andPerl.Thesetoolsarenotneededtobuildfromadistributiontarballsincethefilesthey
areusedtobuildareincludedinthetarball.OthertoolrequirementsarethesameasshowninChapter
15.
I.1. Getting The Source via Git
WithGityouwillmakeacopyoftheentirecoderepositoryonyourlocalmachine,soyouwillhave
accesstoallhistoryandbranchesoffline.Thisisthefastestandmostflexiblewaytodeveloportest
patches.
Git
1. Youwill need aninstalled version ofGit,which youcan get fromhttp://git-scm.com.Many
systems alreadyhavea recentversionofGitinstalledbydefault,oravailableintheirpackage
distributionsystem.
2. TobeginusingtheGitrepository,makeacloneoftheofficialmirror:
git clone git://git.postgresql.org/git/postgresql.git
This willcopy the fullrepository toyourlocalmachine,so itmay take a while tocomplete,
especiallyifyouhaveaslowInternetconnection.Thefileswillbeplacedinanewsubdirectory
postgresql
ofyourcurrentdirectory.
TheGitmirrorcanalsobereachedviatheHTTPprotocol,ifforexampleafirewallisblocking
accesstotheGitprotocol.JustchangetheURLprefixto
http
,asin:
git clone http://git.postgresql.org/git/postgresql.git
TheHTTPprotocolislessefficientthantheGitprotocol,soitwillbeslowertouse.
3. Wheneveryouwanttogetthelatestupdatesinthesystem,
cd
intotherepository,andrun:
git fetch
Gitcandoalotmorethingsthanjustfetchthe source.Formoreinformation,consulttheGitman
pages,orseethewebsiteathttp://git-scm.com.
2932
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C# PDF: PDF Document Viewer & Reader SDK for Windows Forms
After adding WinViewer DLL into Visual Studio Toolbox, you link to see more C# PDF imaging project converting, compressing and stroing images, documents and
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Appendix J. Documentation
PostgreSQLhasfourprimarydocumentationformats:
Plaintext,forpre-installationinformation
HTML,foron-linebrowsingandreference
PDForPostScript,forprinting
manpages,forquickreference.
Additionally,a numberofplain-text
README
files canbe foundthroughoutthePostgreSQLsource
tree,documentingvariousimplementationissues.
HTMLdocumentationandmanpagesarepartofastandarddistributionandareinstalledbydefault.
PDFandPostScriptformatdocumentationisavailableseparatelyfordownload.
J.1. DocBook
ThedocumentationsourcesarewritteninDocBook,whichisamarkuplanguagesuperficiallysimilar
toHTML.BothoftheselanguagesareapplicationsoftheStandardGeneralizedMarkupLanguage,
SGML,whichis essentiallya languagefordescribingotherlanguages.Inwhatfollows,the terms
DocBookandSGMLarebothused,buttechnicallytheyarenotinterchangeable.
DocBookallowsanauthortospecifythestructureandcontentofatechnicaldocumentwithoutwor-
ryingaboutpresentationdetails.Adocumentstyledefineshowthatcontentisrenderedintooneof
severalfinalforms.DocBookismaintainedbythe OASISgroup
1
.The officialDocBooksite
2
has
goodintroductoryandreferencedocumentationandacompleteO’Reillybookforyouronlineread-
ingpleasure.The NewbieDocDocbookGuide
3
isveryhelpfulforbeginners.The FreeBSDDocu-
mentationProject
4
alsousesDocBookandhassomegoodinformation,includinganumberofstyle
guidelinesthatmightbeworthconsidering.
J.2. Tool Sets
Thefollowingtoolsareusedtoprocessthedocumentation.Somemightbeoptional,asnoted.
DocBookDTD
5
This isthedefinitionofDocBookitself.Wecurrentlyuseversion4.2;youcannotuselateror
earlierversions.YouneedtheSGMLvariantoftheDocBookDTD,buttobuildmanpagesyou
alsoneedtheXMLvariantofthesameversion.
1. http://www.oasis-open.org
2. http://www.oasis-open.org/docbook/
3. http://newbiedoc.sourceforge.net/metadoc/docbook-guide.html
4. http://www.freebsd.org/docproj/docproj.html
5. http://www.oasis-open.org/docbook/
2933
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at the page level, like TIFF page adding & deleting controls, PDF document, image to pdf files and converting, compressing and stroing images, documents and more
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AppendixJ.Documentation
ISO8879characterentities
6
Theseare requiredbyDocBookbutare distributedseparatelybecausetheyaremaintainedby
ISO.
DocBookDSSSLStylesheets
7
ThesecontaintheprocessinginstructionsforconvertingtheDocBooksourcestootherformats,
suchasHTML.
DocBookXSLStylesheets
8
ThisisanotherstylesheetforconvertingDocBooktootherformats.Wecurrentlyusethistopro-
ducemanpagesandoptionallyHTMLHelp.YoucanalsousethistoolchaintoproduceHTML
orPDFoutput,butofficialPostgreSQLreleasesusetheDSSSLstylesheetsforthat.
Theminimumrequiredversioniscurrently1.74.0.
OpenJade
9
ThisisthebasepackageofSGMLprocessing.ItcontainsanSGMLparser,aDSSSLprocessor
(thatis,aprogramtoconvertSGMLtootherformats usingDSSSL stylesheets),aswell asa
numberofrelatedtools.Jadeis nowbeing maintained by the OpenJade group,nolongerby
JamesClark.
Libxslt
10
for
xsltproc
ThisistheprocessingtooltousewiththeXSLTstylesheets(like
jade
istheprocessingtoolfor
DSSSLstylesheets).
JadeTeX
11
Ifyouwantto,youcanalsoinstallJadeTeXtouseTeXasaformattingbackendforJade.JadeTeX
cancreatePostScriptorPDFfiles(thelatterwithbookmarks).
However,theoutputfromJadeTeXisinferiortowhatyougetfromtheRTFbackend.Particular
problemareasaretablesandvariousartifactsofverticalandhorizontalspacing.Also,thereisno
opportunitytomanuallypolishtheresults.
Wehavedocumentedexperiencewithseveralinstallationmethodsforthevarioustoolsthatareneeded
toprocess thedocumentation.Thesewillbedescribedbelow.Theremightbesomeotherpackaged
distributions forthesetools.Pleasereportpackagestatustothedocumentationmailinglist,andwe
willincludethatinformationhere.
J.2.1.Linux RPM Installation
Most vendors provide a complete RPM set for DocBook processing in their distribution. Look
for an “SGML” option while installing, or the following packages:
sgml-common
,
docbook
,
stylesheets
,
openjade
(or
jade
).You may also need
sgml-tools
and either
xsltproc
or
libxslt
.Ifyour distributor does not provide these then you shouldbe able to make use of the
packagesfromsomeother,reasonablycompatiblevendor.
6. http://www.oasis-open.org/cover/ISOEnts.zip
7. http://wiki.docbook.org/DocBookDssslStylesheetDocs
8. http://wiki.docbook.org/DocBookXslStylesheets
9. http://openjade.sourceforge.net
10. http://xmlsoft.org/XSLT/
11. http://jadetex.sourceforge.net
2934
AppendixJ.Documentation
J.2.2.FreeBSD Installation
TheFreeBSDDocumentationProjectis itselfaheavyuserofDocBook,soitcomesas nosurprise
thatthereisafullsetof“ports”ofthedocumentationtoolsavailableonFreeBSD.Thefollowingports
needtobeinstalledtobuildthedocumentationonFreeBSD.
textproc/sp
textproc/openjade
textproc/iso8879
textproc/dsssl-docbook-modular
textproc/docbook-420
Anumberofthingsfrom
/usr/ports/print
(
tex
,
jadetex
)mightalsobeofinterest.
It’s
possible
that the
ports
do
not
update
the
main
catalog
file
in
/usr/local/share/sgml/catalog.ports
or that the order isn’t proper. Be sure to have the
followinglinesinthebeginningofthefile:
CATALOG "openjade/catalog"
CATALOG "iso8879/catalog"
CATALOG "docbook/dsssl/modular/catalog"
CATALOG "docbook/4.2/catalog"
Ifyoudonotwanttoeditthefileyoucanalsosettheenvironmentvariable
SGML_CATALOG_FILES
toacolon-separatedlistofcatalogfiles(suchastheoneabove).
MoreinformationabouttheFreeBSDdocumentationtoolscanbefoundinthe FreeBSDDocumen-
tationProject’sinstructions
12
.
J.2.3.Debian Packages
ThereisafullsetofpackagesofthedocumentationtoolsavailableforDebianGNU/Linux.Toinstall,
simplyuse:
apt-get install docbook docbook-dsssl docbook-xsl openjade1.3 opensp xsltproc
J.2.4.OS X
IfyouuseMacPorts,thefollowingwillgetyousetup:
sudo port install docbook-dsssl docbook-sgml-4.2 docbook-xml-4.2 docbook-xsl libxslt openjade opensp
12. http://www.freebsd.org/doc/en_US.ISO8859-1/books/fdp-primer/tools.html
2935
AppendixJ.Documentation
J.2.5.ManualInstallation from Source
The manualinstallationprocess ofthe DocBook tools is somewhat complex,so ifyou have pre-
builtpackagesavailable,usethem.Wedescribehereonlyastandardsetup,withreasonablystandard
installationpaths,and no“fancy”features.Fordetails,you should studythe documentationofthe
respectivepackage,andreadSGMLintroductorymaterial.
J.2.5.1.InstallingOpenJade
1. TheinstallationofOpenJadeoffersaGNU-style
./configure; make; make install
build
process.DetailscanbefoundintheOpenJadesourcedistribution.Inanutshell:
./configure --enable-default-catalog=/usr/local/share/sgml/catalog
make
make install
Besuretorememberwhereyouputthe“defaultcatalog”;youwillneeditbelow.Youcanalso
leaveitoff,but thenyou willhave tosetthe environmentvariable
SGML_CATALOG_FILES
to
pointtothefilewheneveryouusejadelateron.(This methodis alsoanoptionifOpenJadeis
alreadyinstalledandyouwanttoinstalltherestofthetoolchainlocally.)
Note:SomeusershavereportedencounteringasegmentationfaultusingOpenJade1.4de-
veltobuildthePDFs,withamessagelike:
openjade:./stylesheet.dsl:664:2:E: flow object not accepted by port; only display flow objects accepted
make:
***
[postgres-A4.tex-pdf] Segmentation fault
DowngradingtoOpenJade1.3shouldgetridofthiserror.
2.
Additionally, you should install the files
dsssl.dtd
,
fot.dtd
,
style-sheet.dtd
,
and
catalog
from
the
dsssl
directory
somewhere,
perhaps
into
/usr/local/share/sgml/dsssl
.It’sprobablyeasiesttocopytheentiredirectory:
cp -R dsssl /usr/local/share/sgml
3. Finally,createthefile
/usr/local/share/sgml/catalog
andaddthislinetoit:
CATALOG "dsssl/catalog"
(Thisisarelativepathreferencetothefileinstalledinstep2.Besuretoadjustitifyouchose
yourinstallationlayoutdifferently.)
J.2.5.2.InstallingtheDocBookDTDKit
1. Obtainthe DocBookV4.2distribution
13
.
2. Createthe directory
/usr/local/share/sgml/docbook-4.2
andchange toit.(Theexact
locationisirrelevant,butthisoneisreasonablewithinthelayoutwearefollowinghere.)
$ mkdir /usr/local/share/sgml/docbook-4.2
$ cd /usr/local/share/sgml/docbook-4.2
3. Unpackthearchive:
$ unzip -a ...../docbook-4.2.zip
(Thearchivewillunpackitsfilesintothecurrentdirectory.)
13. http://www.docbook.org/sgml/4.2/docbook-4.2.zip
2936
AppendixJ.Documentation
4. Editthefile
/usr/local/share/sgml/catalog
(orwhateveryoutoldjadeduringinstalla-
tion)andputalinelikethisintoit:
CATALOG "docbook-4.2/docbook.cat"
5. Download the ISO8879characterentitiesarchive
14
,unpackit,andputthefiles inthe same
directoryyouputtheDocBookfilesin:
$ cd /usr/local/share/sgml/docbook-4.2
$ unzip ...../ISOEnts.zip
6. RunthefollowingcommandinthedirectorywiththeDocBookandISOfiles:
perl -pi -e ’s/iso-(.
*
).gml/ISO\1/g’ docbook.cat
(ThisfixesamixupbetweenthenamesusedintheDocBookcatalogfileandtheactualnamesof
theISOcharacterentityfiles.)
J.2.5.3.InstallingtheDocBookDSSSLStyleSheets
Toinstallthestylesheets,unzipanduntarthedistributionandmoveittoasuitableplace,forexample
/usr/local/share/sgml
.(Thearchivewillautomaticallycreateasubdirectory.)
$ gunzip docbook-dsssl-1.
xx
.tar.gz
$ tar -C /usr/local/share/sgml -xf docbook-dsssl-1.
xx
.tar
Theusualcatalogentryin
/usr/local/share/sgml/catalog
canalsobemade:
CATALOG "docbook-dsssl-1.
xx
/catalog"
Becausestylesheetschangeratheroften,andit’ssometimesbeneficialtotryoutalternativeversions,
PostgreSQLdoesn’tusethiscatalogentry.SeeSectionJ.2.6forinformationabouthowtoselectthe
stylesheetsinstead.
J.2.5.4.InstallingJadeTeX
ToinstallanduseJadeTeX,youwillneedaworkinginstallationofTeXandLaTeX2e,includingthe
supportedtoolsandgraphicspackages,Babel,AMSfontsandAMS-LaTeX,thePSNFSSextension
andcompanionkitof“the35fonts”,thedvipsprogramforgeneratingPostScript,themacropackages
fancyhdr,hyperref,minitoc,urlandot2enc.Allofthesecanbefoundonyourfriendlyneighborhood
CTANsite
15
.Theinstallationofthe TeXbasesystemis farbeyond the scopeofthis introduction.
BinarypackagesshouldbeavailableforanysystemthatcanrunTeX.
BeforeyoucanuseJadeTeXwiththePostgreSQLdocumentationsources,youwillneedtoincrease
thesize ofTeX’s internal data structures.Detailsonthis canbe foundintheJadeTeXinstallation
instructions.
OncethatisfinishedyoucaninstallJadeTeX:
$ gunzip jadetex-
xxx
.tar.gz
$ tar xf jadetex-
xxx
.tar
$ cd jadetex
$ make install
$ mktexlsr
14. http://www.oasis-open.org/cover/ISOEnts.zip
15. http://www.ctan.org
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