Longer explanation of the experimental scenario.
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.NH
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Indexes
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.LP
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.so macros.roff
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.TITLE Brief performance analysis of Document Oriented DataBase (DODB)
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.AUTHOR Philippe P.
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.ABSTRACT1
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DODB is a database-as-library, enabling a very simple way to store applications' data: storing serialized
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.I documents
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(basically any data type) in plain files.
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To speed-up searches, attributes of these documents can be used as indexes which leads to create a few symbolic links
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.I symlinks ) (
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on the disk.
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.br
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See the \f[CW]README\f[] for a longer explanation.
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This document briefly presents an experiment to understand the performances we can get with this approach.
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.br
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.UL Status :
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WIP
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.ABSTRACT2
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.SECTION Experimental scenario
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.LP
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The following experiment shows the performance of DODB based on quering durations.
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Data can be searched via
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.I indexes ,
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as for SQL databases.
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Three possible indexes exist in DODB:
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(a) basic indexes, representing 1 to 1 relations, the document's attribute is related to a value and each value of this attribute is unique,
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(b) partitions, representing 1 to n relations, the attribute has a value and this value can be shared by other documents,
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(c) tags, representing n to n relations, enabling the attribute to have multiple values whose are shared by other documents.
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The scenario is simple: adding values to a database with indexes (basic, partitions and tags) then query 100 times a value based on the different indexes.
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Loop and repeat.
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Four instances of DODB are tested:
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.BULLET \fIuncached database\f[] shows the achievable performance with a strong memory constraint (nothing can be kept in-memory) ;
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.BULLET \fIuncached data but cached index\f[] shows the improvement you can expect by having a cache on indexes ;
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.BULLET \fIcached database\f[] shows the most basic use of DODB\*[*] ;
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.BULLET \fIRAM only\f[], the database doesn't have a representation on disk (no data is written on it).
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The \fIRAM only\f[] instance shows a possible way to use DODB: to keep a consistent API to store data, including in-memory data with a lifetime related to the application's.
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.ENDBULLET
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.FOOTNOTE1
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Having a cached database will probably be the most widespread use of DODB.
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When memory isn't scarce, there is no point not using it to achieve better performance.
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.FOOTNOTE2
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The computer on which this test is performed\*[*] is a AMD PRO A10-8770E R7 (4 cores), 2.8 GHz.When mentioned, the
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.I disk
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is actually a
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.I "temporary file-system (tmpfs)"
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to enable maximum efficiency.
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.FOOTNOTE1
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A very simple $50 PC, buyed online.
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Nothing fancy.
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.FOOTNOTE2
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The library is written in Crystal and so is the benchmark (\f[CW]spec/benchmark-cars.cr\f[]).
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Nonetheless, despite a few technicalities, the objective of this document is to provide an insight on the approach used in DODB more than this particular implementation.
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The manipulated data type can be found in \f[CW]spec/db-cars.cr\f[].
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.SOURCE Ruby ps=9 vs=9p
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class Car
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property name : String # 1-1 relation
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property color : String # 1-n relation
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property keywords : Array(String) # n-n relation
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end
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.SOURCE
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.
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.SECTION Basic indexes (1 to 1 relations)
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.LP
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An index enables to match a single value based on a small string.
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Since there is only one value to retrieve, the request is quick and time is almost constant.
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When the value and the index are kept in memory (see \f[CW]RAM only\f[] and \f[CW]Cached db\f[]), the retrieval is almost instantaneous (about 50 to 120 ns).
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In case the value is on the disk, deserialization takes about 15 µs (see \f[CW]Uncached db, cached index\f[]).
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The request is a little longer when the index isn't cached, in this case DODB walks the file-system to find the right symlink to follow, thus slowing the process even more, by up to 20%.
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.G1
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frame invis ht 3 wid 4 left solid bot solid
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.bp
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.SECTION Partitions (1 to n relations)
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.SECTION Tags (n to n relations)
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.br
|
||||
..XX
|
||||
..
|
||||
.de AUTHOR
|
||||
. AU
|
||||
. ie !'\\$1'' \\$*
|
||||
..
|
||||
.de FOOTNOTE1
|
||||
. FS
|
||||
..
|
||||
.de FOOTNOTE2
|
||||
. FE
|
||||
..
|
||||
.de VOCABULARY1
|
||||
. KS
|
||||
. BULLET
|
||||
. UL "\\$*" :
|
||||
..
|
||||
.de VOCABULARY2
|
||||
. KE
|
||||
..
|
||||
.
|
||||
.
|
||||
.de HIGHLIGHT
|
||||
.
|
||||
. nr @wd \w'\\$1'
|
||||
. nr x1 0
|
||||
. nr y1 (\\n[rst]u - \\n[rsb]u + .4m)
|
||||
. nr x2 (\\n[@wd]u + .4m)
|
||||
. nr y2 0
|
||||
. nr x3 0
|
||||
. nr y3 (\\n[rst]u - \\n[rsb]u + .4m)
|
||||
. nr x4 (\\n[@wd]u + .4m)
|
||||
. nr y4 0
|
||||
.
|
||||
\h'.2m'\
|
||||
\h'-.2m'\v'(.2m - \\n[rsb]u)'\
|
||||
\M[color_box]\
|
||||
\D'P \\n[x1] -\\n[y1]u \\n[x2]u \\n[y2]u \\n[x3]u \\n[y3]u -\\n[x4]u \\n[y4]u '\
|
||||
\h'.2m'\v'-(.2m - \\n[rsb]u)'\
|
||||
\M[]\
|
||||
\\$1\
|
||||
\h'.2m'
|
||||
..
|
||||
.
|
||||
.
|
||||
.
|
||||
.ds SPACE_SS_NUMBER_TITLE 0.5\" not a number register because of leading 0
|
||||
.nr CURRENT_SECTION 0 +1
|
||||
.nr CURRENT_APPENDIX 0
|
||||
.af CURRENT_APPENDIX I
|
||||
.nr CURRENT_SUBSECTION 0 +1
|
||||
.nr CURRENT_SSSECTION 0 +1
|
||||
.rm SECTION
|
||||
.de SECTION
|
||||
. nr CURRENT_SUBSECTION 0 \" reset current subsection numbering
|
||||
. nr CURRENT_SSSECTION 0 \" reset current subsubsection numbering
|
||||
. ie !(\\n[CURRENT_SECTION]=0) .sp +1
|
||||
. br
|
||||
. ie (\\n[APPENDIX_TIME]=0) \
|
||||
. ds RH \\n+[CURRENT_SECTION].\h'\\*[SPACE_SS_NUMBER_TITLE]' \\$*
|
||||
. el \{
|
||||
. ds RH \\n[CURRENT_APPENDIX].\h'\\*[SPACE_SS_NUMBER_TITLE]' \\$*
|
||||
. bp \}
|
||||
. ps +2
|
||||
. fam H \" helvetica family
|
||||
. ft B
|
||||
. ne 4 \" should be at least a few lines left at the bottom of the page
|
||||
\\*[RH]
|
||||
. ft
|
||||
. fam \" back to previous font family
|
||||
. ps -2
|
||||
. PARAGRAPH_INDENTED
|
||||
..
|
||||
.nr APPENDIX_TIME 0
|
||||
.de APPENDIX
|
||||
. nr CURRENT_APPENDIX +1
|
||||
. nr APPENDIX_TIME 1
|
||||
. SECTION \\$*
|
||||
..
|
||||
.de SS
|
||||
. nr CURRENT_SSSECTION 0
|
||||
. ie (\\n[APPENDIX_TIME]=0) \
|
||||
. SUBSECTION_NO_NUMBER \\n[CURRENT_SECTION].\
|
||||
\\n+[CURRENT_SUBSECTION]\h'\\*[SPACE_SS_NUMBER_TITLE]' \\$*
|
||||
.el \
|
||||
. SUBSECTION_NO_NUMBER \\n[CURRENT_APPENDIX].\
|
||||
\\n+[CURRENT_SUBSECTION]\h'\\*[SPACE_SS_NUMBER_TITLE]' \\$*
|
||||
..
|
||||
.de SSS
|
||||
. br
|
||||
. ps -2
|
||||
. fam H \" helvetica family
|
||||
. ft B
|
||||
. ie (\\n[APPENDIX_TIME]=0) \
|
||||
. SUBSECTION_NO_NUMBER \\n[CURRENT_SECTION].\
|
||||
\\n[CURRENT_SUBSECTION].\\n+[CURRENT_SSSECTION]\h'\
|
||||
\\*[SPACE_SS_NUMBER_TITLE]' \\$*
|
||||
. el \
|
||||
\\n[CURRENT_APPENDIX].\
|
||||
\\n[CURRENT_SUBSECTION].\\n+[CURRENT_SSSECTION]\h'\
|
||||
\\*[SPACE_SS_NUMBER_TITLE]' \\$*
|
||||
. ft
|
||||
. fam \" back to previous font family
|
||||
. ps +2
|
||||
. PARAGRAPH_INDENTED
|
||||
..
|
||||
.de INNERBULLET
|
||||
. in +1
|
||||
. br
|
||||
\(bu
|
||||
. in +1
|
||||
. sp -1
|
||||
\\$*
|
||||
. in -2
|
||||
..
|
||||
.de EENUM \" Numbered list
|
||||
. nr ENUM_INDENTATION 2
|
||||
. ie !(\\n[LIST_NUMBER]=0) .in -\\n[ENUM_INDENTATION]
|
||||
. br
|
||||
\\n+[LIST_NUMBER].
|
||||
. in +\\n[ENUM_INDENTATION]
|
||||
. sp -1
|
||||
\\$*
|
||||
..
|
||||
.de EENDENUM
|
||||
. nr LIST_NUMBER 0
|
||||
. in -\\n[ENUM_INDENTATION]
|
||||
..
|
||||
.nr legendps 2
|
||||
.de LEGEND1
|
||||
. QP
|
||||
. vs -\\n[legendps]p
|
||||
. ps -\\n[legendps]
|
||||
. in -1.2
|
||||
. ll +1.2
|
||||
. br
|
||||
..
|
||||
.de LEGEND2
|
||||
. br
|
||||
. vs +\\n[legendps]p
|
||||
. ps +\\n[legendps]
|
||||
. br
|
||||
. LP
|
||||
..
|
||||
.de IEME
|
||||
\\$1\u\s-4\\$2\s+4\d
|
||||
..
|
||||
.de CENTERED
|
||||
. ce
|
||||
\\$*
|
||||
. br
|
||||
..
|
||||
.de GIVEEXAMPLE1
|
||||
. in +1
|
||||
. ll -1
|
||||
. KS \" start a keep
|
||||
. \" .ft I \" citation in italics
|
||||
. mk C \" set a marker for line drawing
|
||||
. in +1 \" indent a bit
|
||||
. gcolor citation
|
||||
..
|
||||
.de GIVEEXAMPLE2
|
||||
. mk D \" set second marker to come back here
|
||||
. \" .ft \" back to previous font
|
||||
. in -1 \" remove indent
|
||||
. gcolor black\" remove previous color
|
||||
. gcolor citationbar
|
||||
. \" r = move upward
|
||||
. \" Z D t = drawing thickness
|
||||
. \" L = draw the line
|
||||
\r\
|
||||
\Z'\D't 1p''\
|
||||
\L'|\\nCu' \" draw line
|
||||
. gcolor black \" remove previous color
|
||||
. sp -2 \" get two lines back
|
||||
\Z'\D't 0.5p'' \" get the previous drawing thickness back
|
||||
. KE \" end of the keep
|
||||
. ll +1
|
||||
. in -1
|
||||
..
|
||||
.de ST
|
||||
.nr ww \w'\\$1'
|
||||
\Z@\v'-.25m'\l'\\n[ww]u'@\\$1
|
||||
..
|
||||
.de INCREMENT
|
||||
.br
|
||||
.in \\*[PINCREMENT]
|
||||
.br
|
||||
\h'-\\*[DECALAGE]'\\*[CHARACTER]\h'|0'\\$*
|
||||
..
|
||||
.de D
|
||||
.ds DECALAGE 1.0
|
||||
.ds PINCREMENT 2
|
||||
.ds CHARACTER \(bu
|
||||
.INCREMENT \\$*
|
||||
..
|
||||
.de DD
|
||||
.ds DECALAGE 1.0
|
||||
.ds PINCREMENT 3
|
||||
.ds CHARACTER \(bu
|
||||
.INCREMENT \\$*
|
||||
..
|
||||
.de AA
|
||||
.ds DECALAGE 1.5
|
||||
.ds PINCREMENT 3
|
||||
.ds CHARACTER \(->
|
||||
.INCREMENT \\$*
|
||||
..
|
||||
.de AAA
|
||||
.ds DECALAGE 1.5
|
||||
.ds PINCREMENT 4
|
||||
.ds CHARACTER \(->
|
||||
.INCREMENT \\$*
|
||||
..
|
||||
.de ED
|
||||
.br
|
||||
.in 0
|
||||
..
|
||||
Loading…
Reference in New Issue
Block a user