How to remove duplicates when serializing?
hi,
I think this has been asked before but have not been able to find the answer in the forums or google..
I'd like to save space when serializing a structure to disk, as the storage medium is slow and it is expensive to deserialize large objects. I know that the thing I'm serializing has the same object duplicated in it several times and that its being written out several times.
is there any way to do this (3rd party libraries etc..)?
ideally you'd also be able to configure whether objects are duplicated or not by identity or .equals equality?
thanks,
asjf
hi,
I think this has been asked before but have not been
n able to find the answer in the forums or google..
I'd like to save space when serializing a structure
to disk, as the storage medium is slow and it is
expensive to deserialize large objects. I know that
the thing I'm serializing has the same object
duplicated in it several times and that its being
written out several times.When you say "same," do you mean by identity or by equals? I'm pretty sure that serialization by default does not duplicate the same object (by identity). If you want to avoid serializing "same by equals" you'll probably have to roll your own, overriding readObject/writeObject or whatever methods the docs say to override for custom serialization.
Be aware though, that "same by equals" doesn't really mean the objects will behave the same way. I'd be very careful using that.
Similar Messages
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How does remove duplicates option in sort transformation behaves?
Hi
I am currently on a performance tuning task and I am in the process of replacing the existing transformation (especially SORT, aggregate since it is blocking) into a Stored Procedures (SP). I am not getting the exact results as that of the SORT transformation (remove duplicates) when using the methods in the SP to remove duplicates such as DISTINCT clause, HAVING COUNT>1 option, ROWNUMBER() using OVER PARTITION BY ORDER BY clauses.
Could any of one help me how exactly does the SORT transformation with remove duplicate options work in SSIS?
Please let me know if you need any more information.
Thanks in Advance
MervynHi
I am currently on a performance tuning task and I am in the process of replacing the existing transformation (especially SORT, aggregate since it is blocking) into a Stored Procedures (SP). I am not getting the exact results as that of the SORT transformation (remove duplicates) when using the methods in the SP to remove duplicates such as DISTINCT clause, HAVING COUNT>1 option, ROWNUMBER() using OVER PARTITION BY ORDER BY clauses.
Could any of one help me how exactly does the SORT transformation with remove duplicate options work in SSIS?
Please let me know if you need any more information.
Thanks in Advance
Mervyn
There's an important thing to understand about using the "remove duplicates" feature of the Sort transform - the results are arbitrary. For example, take the following dataset:
ID | Name
3 | Mervyn
2 | Bharani
1 | Nitesh
2 | Jamie
Now, if you use the Sort transform to sort on ID and then remove duplicates then you *might* end up with the following result:
ID | Name
1 | Nitesh
2 | Bharani
3 | Mervyn
or, you *might* end up with this:
ID | Name
1 | Nitesh
2 | Jamie
3 | Mervyn
notice how it arbitrarily picks either "Jamie" or "Bharani" because they both have the same ID. I've never seen any requirement, ever, that says "arbitrarily pick a result, I don't care which one I get".
I guess the point I'm ultimately trying to make is this - are you *sure* that what you want to do is replicate this behaviour? There is no construct in T-SQL that replicates the arbitrary nature of the Sort transfom (and nor should there be), with T-SQL you absolutely have to tell it whether (in the above example) you would want "Jamie" or "Bharani".
Hope that helps.
-Jamie
http://sqlblog.com/blogs/jamie_thomson/ | http://jamiethomson.spaces.live.com/ | @jamiet -
How to remove duplicates in iphoto 7.1.5 and aperture 2.1.4 on same hard drive
How to remove duplicates from iPhoto 7.1.5 and Aperture 2.1.4 on same hard drive?
For iPhoto duplicate annihalitor is a good solution
For Aperture it is best to ask in the aperture forum
LN -
TS3999 how to remove duplicate Birthday entries in icloud on my PC
how to remove duplicate Birthday entries in icloud on my PC
The Birthday entries on my iPad are ok.Welcome to the Apple Community.
The following article(s) may help you.
Resolving duplicate calendars -
How to Remove Duplicates Without Changing Album?
Hello All,
I see a lot of topics on how to remove duplicate songs but there is one thing I would like to know if its possible...
I would like to remove my duplicates but I still want to see the songs as part of the albums. Example: lets say the same song is present in 3 different albums. I would like to remove 2 of them but have them still showing up as part of the 3 albums. This way the albums remain "complete".
Is there any way to tool available that can do that? Maybe keeping something like a symbolic link in place of the songs that were deleted?
Any help would be appreciated.
Thanks!Not possible and has been asked before.
MJ -
How to remove duplicates records from output ?
how to remove duplicates records from output ? i used delete adjacent but duplicates records are coming again ..suggest me
hi shruthi,
thanks for ur answer ..but duplicates records coming again
here is my code >> plz check it out
*& Report ZCRM_TROUBLE_TICKET
REPORT zcrm_trouble_ticket.
TYPES : BEGIN OF ty_qmih,
qmnum TYPE qmnum,
equnr TYPE equnr,
iloan TYPE iloan,
ausvn TYPE ausvn,
ausbs TYPE ausbs,
auztv TYPE auztv,
auztb TYPE auztb,
iwerk TYPE iwerk,
END OF ty_qmih,
BEGIN OF ty_qmel,
qmnum TYPE qmnum,
qmtxt TYPE qmtxt,
indtx TYPE indltx,
priok TYPE priok,
strmn TYPE strmn,
strur TYPE strur,
ltrmn TYPE ltrmn,
ltrur TYPE ltrur,
objnr TYPE qmobjnr,
arbpl TYPE lgwid,
vkorg TYPE vkorg,
vtweg TYPE vtweg,
spart TYPE spart,
END OF ty_qmel,
BEGIN OF ty_ihpa,
parnr TYPE i_parnr,
parvw TYPE parvw,
objnr TYPE qmobjnr,
END OF ty_ihpa,
BEGIN OF ty_crhd,
arbpl TYPE arbpl,
objid TYPE cr_objid,
END OF ty_crhd,
BEGIN OF ty_crtx,
ktext TYPE cr_ktext,
objid TYPE cr_objid,
END OF ty_crtx,
BEGIN OF ty_qmfe,
fecod TYPE fecod,
fegrp TYPE fegrp,
qmnum TYPE qmnum,
END OF ty_qmfe,
BEGIN OF ty_qmur,
urcod TYPE urcod,
urgrp TYPE urgrp,
urtxt TYPE urstx,
qmnum TYPE qmnum,
END OF ty_qmur,
BEGIN OF ty_iloa,
tplnr TYPE tplnr,
iloan TYPE iloan,
END OF ty_iloa,
BEGIN OF ty_output,
qmnum TYPE qmnum,
equnr TYPE equnr,
iloan TYPE iloan,
ausvn TYPE ausvn,
ausbs TYPE ausbs,
auztv TYPE auztv,
auztb TYPE auztb,
iwerk TYPE iwerk,
qmtxt TYPE qmtxt,
indtx TYPE indltx,
priok TYPE priok,
strmn TYPE strmn,
strur TYPE strur,
ltrmn TYPE ltrmn,
ltrur TYPE ltrur,
objnr TYPE qmobjnr,
arbpl TYPE lgwid,
vkorg TYPE vkorg,
vtweg TYPE vtweg,
spart TYPE spart,
parnr TYPE i_parnr,
parvw TYPE parvw,
arbpl TYPE arbpl,
objid TYPE cr_objid,
arbpl1 TYPE arbpl,
ktext TYPE cr_ktext,
fecod TYPE fecod,
fegrp TYPE fegrp,
urcod TYPE urcod,
urgrp TYPE urgrp,
urtxt TYPE urstx,
tplnr TYPE tplnr,
END OF ty_output.
DATA : it_qmih TYPE STANDARD TABLE OF ty_qmih,
it_qmel TYPE STANDARD TABLE OF ty_qmel,
it_ihpa TYPE STANDARD TABLE OF ty_ihpa,
it_crhd TYPE STANDARD TABLE OF ty_crhd,
it_crtx TYPE STANDARD TABLE OF ty_crtx,
it_qmfe TYPE STANDARD TABLE OF ty_qmfe,
it_qmur TYPE STANDARD TABLE OF ty_qmur,
it_iloa TYPE STANDARD TABLE OF ty_iloa,
it_output TYPE STANDARD TABLE OF ty_output,
wa_qmih TYPE ty_qmih,
wa_qmel TYPE ty_qmel,
wa_ihpa TYPE ty_ihpa,
wa_crhd TYPE ty_crhd,
wa_crtx TYPE ty_crtx,
wa_qmfe TYPE ty_qmfe,
wa_qmur TYPE ty_qmur,
wa_iloa TYPE ty_iloa,
wa_output TYPE ty_output.
INITIALIZATION.
REFRESH : it_qmih,
it_qmel,
it_ihpa,
it_crhd,
it_crtx,
it_qmfe,
it_qmur,
it_iloa,
it_output.
CLEAR: wa_qmih,
wa_qmel,
wa_ihpa,
wa_crhd,
wa_crtx,
wa_qmfe,
wa_qmur,
wa_iloa,
wa_output.
start-of-selection.
SELECT qmnum
equnr
iloan
ausvn
ausbs
auztv
auztb
iwerk
FROM qmih
INTO TABLE it_qmih.
SORT it_qmih BY qmnum .
DELETE ADJACENT DUPLICATES FROM it_qmih COMPARING qmnum equnr iloan ausvn ausbs auztv auztb iwerk.
SELECT qmnum
qmtxt
indtx
priok
strmn
strur
ltrmn
ltrur
objnr
arbpl
vkorg
vtweg
spart
FROM qmel
INTO TABLE it_qmel
FOR ALL ENTRIES IN it_qmih
WHERE qmnum = it_qmih-qmnum.
SORT it_qmel BY qmnum.
DELETE ADJACENT DUPLICATES FROM it_qmel COMPARING qmnum
qmtxt
indtx
strmn
strur
ltrmn
ltrur
objnr
arbpl
vkorg
vtweg
spart.
IF it_qmel IS NOT INITIAL.
SELECT parnr
parvw
objnr
FROM ihpa
INTO TABLE it_ihpa
FOR ALL ENTRIES IN it_qmel
WHERE objnr = it_qmel-objnr.
ENDIF.
DELETE ADJACENT DUPLICATES FROM it_ihpa COMPARING parnr
parvw
objnr.
IF it_qmel IS NOT INITIAL.
SELECT arbpl
objid
FROM crhd
INTO TABLE it_crhd
FOR ALL ENTRIES IN it_qmel
WHERE objid = it_qmel-arbpl.
ENDIF.
DELETE ADJACENT DUPLICATES FROM it_crhd COMPARING arbpl
objid.
IF it_qmel IS NOT INITIAL.
SELECT ktext
objid
FROM crtx
INTO TABLE it_crtx
FOR ALL ENTRIES IN it_crhd
WHERE objid = it_crhd-objid.
ENDIF.
DELETE ADJACENT DUPLICATES FROM it_crtx COMPARING ktext
objid.
IF it_qmih IS NOT INITIAL.
SELECT fecod
fegrp
qmnum
FROM qmfe
INTO TABLE it_qmfe
FOR ALL ENTRIES IN it_qmih
WHERE qmnum = it_qmih-qmnum.
ENDIF.
SORT it_qmfe BY qmnum.
DELETE ADJACENT DUPLICATES FROM it_qmfe COMPARING fecod
fegrp.
IF it_qmih IS NOT INITIAL.
SELECT urcod
urgrp
urtxt
qmnum
FROM qmur
INTO TABLE it_qmur
FOR ALL ENTRIES IN it_qmih
WHERE qmnum = it_qmih-qmnum.
ENDIF.
SORT it_qmur BY qmnum.
DELETE ADJACENT DUPLICATES FROM it_qmur COMPARING urcod
urgrp
urtxt.
IF it_qmih IS NOT INITIAL.
SELECT tplnr
iloan
FROM iloa
INTO TABLE it_iloa
FOR ALL ENTRIES IN it_qmih
WHERE iloan = it_qmih-iloan.
ENDIF.
DELETE ADJACENT DUPLICATES FROM it_iloa COMPARING tplnr
iloan.
LOOP AT it_qmih INTO wa_qmih.
wa_output-qmnum = wa_qmih-qmnum.
wa_output-equnr = wa_qmih-equnr.
wa_output-iloan = wa_qmih-iloan.
wa_output-ausvn = wa_qmih-ausvn.
wa_output-ausbs = wa_qmih-ausbs.
wa_output-auztv = wa_qmih-auztv.
wa_output-auztb = wa_qmih-auztb.
wa_output-iwerk = wa_qmih-iwerk.
APPEND wa_output TO it_output.
CLEAR wa_output.
READ TABLE it_qmel INTO wa_qmel WITH KEY qmnum = wa_qmih-qmnum.
wa_output-qmtxt = wa_qmel-qmtxt.
wa_output-indtx = wa_qmel-indtx.
wa_output-priok = wa_qmel-priok.
wa_output-strmn = wa_qmel-strmn.
wa_output-strur = wa_qmel-strur.
wa_output-ltrmn = wa_qmel-ltrmn.
wa_output-ltrur = wa_qmel-ltrur.
wa_output-objnr = wa_qmel-objnr.
wa_output-arbpl = wa_qmel-arbpl.
wa_output-vkorg = wa_qmel-vkorg.
wa_output-vtweg = wa_qmel-vtweg.
wa_output-spart = wa_qmel-spart.
APPEND wa_output TO it_output.
CLEAR wa_output.
READ TABLE it_ihpa INTO wa_ihpa WITH KEY objnr = wa_qmel-objnr.
wa_output-parnr = wa_ihpa-parnr.
wa_output-parvw = wa_ihpa-parvw.
APPEND wa_output TO it_output.
CLEAR wa_output.
READ TABLE it_crhd INTO wa_crhd WITH KEY objid = wa_qmel-arbpl.
wa_output-arbpl = wa_crhd-arbpl.
APPEND wa_output TO it_output.
CLEAR wa_output.
READ TABLE it_crtx INTO wa_crtx WITH KEY objid = wa_crhd-objid.
wa_output-ktext = wa_crtx-ktext.
APPEND wa_output TO it_output.
CLEAR wa_output.
READ TABLE it_qmfe INTO wa_qmfe WITH KEY qmnum = wa_qmih-qmnum.
wa_output-fecod = wa_qmfe-fecod.
wa_output-fegrp = wa_qmfe-fegrp.
APPEND wa_output TO it_output.
CLEAR wa_output.
READ TABLE it_qmur INTO wa_qmur WITH KEY qmnum = wa_qmih-qmnum.
wa_output-urcod = wa_qmur-urcod.
wa_output-urgrp = wa_qmur-urgrp.
wa_output-urtxt = wa_qmur-urtxt.
APPEND wa_output TO it_output.
CLEAR wa_output.
READ TABLE it_iloa INTO wa_iloa WITH KEY iloan = wa_qmih-iloan.
wa_output-tplnr = wa_iloa-tplnr.
APPEND wa_output TO it_output.
CLEAR wa_output.
ENDLOOP.
DELETE ADJACENT DUPLICATES FROM it_output COMPARING qmnum
equnr
ausvn
ausbs
auztv
auztb
iwerk
qmtxt
indtx
priok
strmn
strur
ltrmn
ltrur
vkorg
vtweg
spart
parnr
parvw
arbpl
ktext
fecod
fegrp
urcod
urgrp
urtxt
tplnr.
*CALL FUNCTION 'STATUS_TEXT_EDIT'
EXPORTING
CLIENT = SY-MANDT
FLG_USER_STAT = ' '
objnr =
ONLY_ACTIVE = 'X'
spras = en
BYPASS_BUFFER = ' '
IMPORTING
ANW_STAT_EXISTING =
E_STSMA =
LINE =
USER_LINE =
STONR =
EXCEPTIONS
OBJECT_NOT_FOUND = 1
OTHERS = 2
*IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
*ENDIF.
*CALL FUNCTION 'READ_TEXT'
EXPORTING
CLIENT = SY-MANDT
id =
language =
name =
object =
ARCHIVE_HANDLE = 0
LOCAL_CAT = ' '
IMPORTING
HEADER =
tables
lines =
EXCEPTIONS
ID = 1
LANGUAGE = 2
NAME = 3
NOT_FOUND = 4
OBJECT = 5
REFERENCE_CHECK = 6
WRONG_ACCESS_TO_ARCHIVE = 7
OTHERS = 8
*IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
*ENDIF.
*LOOP AT IT_OUTPUT INTO WA_OUTPUT.
*WRITE : / WA_OUTPUT-qmnum,
WA_OUTPUT-equnr,
WA_OUTPUT-iloan,
WA_OUTPUT-ausvn,
WA_OUTPUT-ausbs,
WA_OUTPUT-auztv,
WA_OUTPUT-auztb,
WA_OUTPUT-qmtxt,
WA_OUTPUT-indtx,
WA_OUTPUT-strmn,
WA_OUTPUT-strur,
WA_OUTPUT-ltrmn,
WA_OUTPUT-ltrur,
WA_OUTPUT-objnr,
WA_OUTPUT-arbpl,
WA_OUTPUT-parnr,
WA_OUTPUT-parvw,
WA_OUTPUT-objid,
WA_OUTPUT-ktext,
WA_OUTPUT-fecod,
WA_OUTPUT-fegrp,
WA_OUTPUT-urcod,
WA_OUTPUT-urgrp,
WA_OUTPUT-urtxt,
WA_OUTPUT-tplnr.
*ENDLOOP.
CALL FUNCTION 'GUI_DOWNLOAD'
EXPORTING
BIN_FILESIZE =
filename = 'E:\CRM1.TXT'
FILETYPE = 'ASC'
APPEND = ' '
write_field_separator = '|'
HEADER = '00'
TRUNC_TRAILING_BLANKS = ' '
WRITE_LF = 'X'
COL_SELECT = ' '
COL_SELECT_MASK = ' '
DAT_MODE = ' '
CONFIRM_OVERWRITE = ' '
NO_AUTH_CHECK = ' '
CODEPAGE = ' '
IGNORE_CERR = ABAP_TRUE
REPLACEMENT = '#'
WRITE_BOM = ' '
TRUNC_TRAILING_BLANKS_EOL = 'X'
WK1_N_FORMAT = ' '
WK1_N_SIZE = ' '
WK1_T_FORMAT = ' '
WK1_T_SIZE = ' '
WRITE_LF_AFTER_LAST_LINE = ABAP_TRUE
IMPORTING
FILELENGTH =
TABLES
data_tab = it_output
FIELDNAMES =
EXCEPTIONS
FILE_WRITE_ERROR = 1
NO_BATCH = 2
GUI_REFUSE_FILETRANSFER = 3
INVALID_TYPE = 4
NO_AUTHORITY = 5
UNKNOWN_ERROR = 6
HEADER_NOT_ALLOWED = 7
SEPARATOR_NOT_ALLOWED = 8
FILESIZE_NOT_ALLOWED = 9
HEADER_TOO_LONG = 10
DP_ERROR_CREATE = 11
DP_ERROR_SEND = 12
DP_ERROR_WRITE = 13
UNKNOWN_DP_ERROR = 14
ACCESS_DENIED = 15
DP_OUT_OF_MEMORY = 16
DISK_FULL = 17
DP_TIMEOUT = 18
FILE_NOT_FOUND = 19
DATAPROVIDER_EXCEPTION = 20
CONTROL_FLUSH_ERROR = 21
OTHERS = 22
IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF. -
How to remove duplicates that appear on my Library?
How to remove duplicates that appear on my library?
On the PC or Mac in iTunes, in the File-menu, select "Show Duplicates". Clean them there and resync to your iPod.
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How to remove duplicate songs in iTunes?
Please advise me how to remove duplicate songs in iTunes? Thank you
THIS is how you remove them, Once you done this...Press and Hold Command on All Music and then Delete and your Done.
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How to eliminate duplicates when merging photos?
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OK, time to move over to the Aperture Discussions Group.
It's at this link - https://discussions.apple.com/community/professional_applications/aperture
This group you are in now is for Lion discussions, and over in the Aperture group, you'll meet skilled people who will help. Especially if you state your questions clearly and provide sufficient context such that the reader can figure out what is needed.
Make sure you spend some time reading the Aperture User Guide before asking really basic questions, and search the PDF version using Preview.
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My contacts and groups are not duplicated in iCloud but my groups are duplicated on iPhone and iPad. Any ideas on how to remove duplicate groups or why they are duplicating?
Welcome to the Apple Community.
Check that you don't have more than one account in your contacts, such as 'iCloud' and 'On My Phone'. -
How we remove duplicate segments from an idoc
how we remove duplicate segments from an idoc.
Hi Manju.
Go to T-code WE19------->Give your Existing Idoc Number or Basic Type --->Get in Select your (Nodes) segment and Click on "Delete Indicator"
Regards,
Seegal -
How can I remove duplicate songs from the iPhone4. The duplicates are not listed in the computer iTunes library.
The simplest thing may be to back-up and then restore the iPhone. If you don't fancy that then remove all media that is currently synced to it, then double check and manually remove any media that remains on the device, before reselecting your sync options.
If you've been manually managing the device and your library doesn't contain copies of all your media then see Recover your iTunes library from your iPod or iOS device.
tt2 -
How to remove duplicate items ?
ok so ive moved my iTunes library from the NAS drive I bought (after finding out that wouldnt work) onto my new laCie external drive, but ive found some of my albums have triple copies?
i know how to show duplicates but im not sure how to safely remove duplicates without deleting all copies?Oh boy.
I'm sure there are better ways to do it than this and it will take time, but to avoid all possible loss of data, what I would do is first consolidate all of your libraries.
• Open the iTunes Library you think is most correct by holding down the OPTION key when you open the iTunes application, which should bring up a dialogue like this: http://cl.ly/image/2i2Q3o0Z0Y3C
• Then go to preferences and make sure it looks like this: http://cl.ly/image/2C2Z0u0C3T3c
I would recommend keeping your main iTunes library on your main hard drive (for me that's my internal), unless you definitely can't fit it.
• Now go to the File menu >Library > Import Playlist
• Navigate to another of the libraries, and click on the iTunes Library.xml file and import it. Do this for each of your libraries, except the one you are currently using.
• Now that you've got everything imported into the one library, the fun part starts.
Do what i said in my previous post and remove all the duplicates.
• Once that's done, check all the other libraries to make sure you haven't missed anything, and send them on their way to the Trash, and empty it to reclaim all that space.
I really hope you get this sorted, I went through an ordeal like this myself recently, so it's going to take time, but it feels good when it's all cleaned up and finished!
xeni
PS. After writing all this I thought, hmm, why didn't I just Google it instead of figuring it out myself? ;P
I found this, and it might help if my instructions weren't clear enough. https://bitly.com/LpqFPq
Also, if you don't already, I urge you to use Time Machine backup. Read more here: http://www.apple.com/osx/apps/#timemachine and http://pondini.org/TM/FAQ.html -
How to remove duplicate songs from Itunes
I've consolidates my music in Itunes 11.01. Playlists are just getting crazy with duplicates.
I want to eliminate duplicate music files, as well as eliminate the references in the interface.
Then sync my new IPad.
When I manually erase a duplicate in Windows Explorer, I'm left with a "!" indication in Itunes that the file cannot be found... duh.
I want to find either an easier way to eliminate duplicates without Windows Explorer, or
a way to select all the "!" references in Itunes interface and delete.
Help please from a completely organized person who hates Apples "intelligence" at thinking it knows what I want, and not providing
adequate help under "remove duplicates" in its help index.
Thanks.How to find and remove duplicate items in your iTunes library - http://support.apple.com/kb/HT2905
Posts by turingtest2 about different types of duplicates and techniques - https://discussions.apple.com/thread/3555601 and https://discussions.apple.com/message/16042406 (Note: The DeDuper script is for Windows).
May 2014 post on iCloud duplicates - https://discussions.apple.com/message/25867873
Show exact duplicates (Mac and Windows) - https://discussions.apple.com/message/16951281
http://dougscripts.com/itunes/itinfo/dupin.php (commercial)
iTunes Duplicate Song Manager - http://sourceforge.net/projects/itunesdsm/
http://www.hardcoded.net/dupeguru_me/
http://www.wideanglesoftware.com/tunesweeper/index.php
http://www.araxis.com/find-duplicate-files (commercial, free trial) - finds duplicate files on computer, not specifically iTunes
I would do it manually. As you can see from turingtest2's post, some duplicates are not really duplicates.
I would also review how you add media to iTunes. It should not be producing all that many duplicates.
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