Re: Export tab delimited from mysql to postgres. - Mailing list pgsql-sql

<p><font size="2">Thanks for all your comments,</font><p>        <font size="2">I have beent trying the insert within a
transactionblock, however it does not seem to reduce the time it takes to process each records. Mind you there are 80
columnand the insert statement explicitly defines the column to insert into.</font><p>        <font size="2">I need any
tipI can get help me transform the text file into a format postgres copy will successfully read. </font><p><font
size="2">Hereis sample of the current format of a mysql tab delimited dump..</font><p><font size="2">columnA columnB
</font><br/><font size="2">1               What a day!</font><br /><font size="2">2               What a week it
has</font><br/><font size="2">been!</font><br /><font size="2">3               What the!</font><p><font size="2">As you
cansee row 2 has a value that holds a CR value which ends up wrapping around onto the third line. Postgres copy command
doesnot like this and mysql is unable to replace the value with another type of delimiter, like a \r.</font><p><font
size="2">SoI gather I have to some how manually replace the carriage return with something postgres understand \r...
</font><p><fontsize="2">columnA columnB </font><br /><font size="2">1               What a day!</font><br /><font
size="2">2              What a week it has \r been!</font><br /><font size="2">3               What the!</font><p><font
size="2">Howdo I do this without getting a text file that looks like this </font><br /><font size="2">1       What a
day!\r\n2               What a week it has \r been!\r\n3                What the!\r\n</font><p><font size="2">Any help
wouldbe appreciated.</font><p><font size="2">Theo</font><p><font size="2">-----Original Message-----</font><br /><font
size="2">From:Christopher Browne [<a href="mailto:cbbrowne@acm.org">mailto:cbbrowne@acm.org</a>] </font><br /><font
size="2">Sent:Tuesday, 12 October 2004 10:46 AM</font><br /><font size="2">To: pgsql-sql@postgresql.org</font><br
/><fontsize="2">Subject: Re: [SQL] Export tab delimited from mysql to postgres.</font><br /><p><font size="2">Quoth
Theo.Galanakis@lonelyplanet.com.au(Theo Galanakis):</font><br /><font size="2">>         Could you provide a example
ofhow to do this?</font><br /><font size="2">></font><br /><font size="2">>         I actually ended up exporting
thedata as Insert statements,</font><br /><font size="2">> which strips out cf/lf within varchars. However it takes
aneternity </font><br /><font size="2">> to import 200,000 records... 24 hours infact???? Is this
normal?</font><p><fontsize="2">I expect that this results from each INSERT being a separate transaction.</font><p><font
size="2">Ifyou put a BEGIN at the start and a COMMIT at the end, you'd doubtless see an ENORMOUS
improvement.</font><p><fontsize="2">That's not even the _big_ improvement, either.  The _big_ improvement would involve
reformattingthe data so that you could use the COPY statement, which is _way_ faster than a bunch of INSERTs.  Take a
lookat the documentation to see the formatting that is needed:</font><p><font size="2"><a
href="http://techdocs.postgresql.org/techdocs/usingcopy.php"
target="_blank">http://techdocs.postgresql.org/techdocs/usingcopy.php</a></font><br/><font size="2"><a
href="http://www.faqs.org/docs/ppbook/x5504.htm"target="_blank">http://www.faqs.org/docs/ppbook/x5504.htm</a></font><br
/><fontsize="2"><a href="http://www.postgresql.org/docs/7.4/static/sql-copy.html"
target="_blank">http://www.postgresql.org/docs/7.4/static/sql-copy.html</a></font><br/><font size="2">-- </font><br
/><fontsize="2">output = ("cbbrowne" "@" "ntlug.org") <a href="http://www3.sympatico.ca/cbbrowne/lsf.html"
target="_blank">http://www3.sympatico.ca/cbbrowne/lsf.html</a></font><br/><font size="2">Question: How many surrealists
doesit take to change a light bulb?</font><p><font size="2">Answer: Two, one to hold the giraffe, and the other to fill
thebathtub</font><br /><font size="2">        with brightly colored machine tools.</font><p><font
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