> -----Original Message----- > From: Albe Laurenz [mailto:laurenz.albe@xxxxxxxxxx] > Sent: Mittwoch, 24. Juni 2015 13:44 > To: Marc Mamin; Postgres General > Subject: RE: Counting the occurences of a substring within a very large > text > > Marc Mamin wrote: > > I'd like to count the number linebreaks within a string, but I get a > > memory allocation error when using regexp_matches or > regexp_split_to_table. > > > > Any idea for an alternative to this problem ? > > > > select count(*)-1 from > > ( select regexp_split_to_table(full_message,'(\n)', 'g') > > from mytable > > where id =-2146999703 > > )foo; > > > > ERROR: invalid memory alloc request size 1447215584 > > Does any of these two work: > > SELECT length(regexp_replace(full_message, '[^\n]', '', 'g')) FROM > mytable WHERE id = -2146999703; > > or > > SELECT length(full_message) - length(replace(full_message, E'\n', '')) > FROM mytable WHERE id = -2146999703; no, they both yeld the same error. a new string functions for this would be nice, as it could certainly be implemented in a more efficient way... BTW: the text to check is a single 350 MB error message from a log file :) > > Yours, > Laurenz Albe -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
