On Mon, Mar 23, 2020 at 3:24 AM pinker <pinker@xxxxxxx> wrote:
time for i in datafiles/*; do
psql -c "\copy json_parts(json_data) FROM $i"&
done
Don't know whether this is faster but it does avoid spinning up a connection multiple times.
#bash, linux
function append_each_split_file_to_etl_load_script() {
for filetoload in ./*; do
ronumber="$(basename $filetoload)"
# only process files since subdirs can be present
if [[ -f "$filetoload" ]]; then
echo ""
echo "\set invoice"' `cat '"'""$filetoload""'"'`'
echo ", ('$ronumber',:'invoice')"
fi >> "$PSQLSCRIPT"
done
echo "" >> "$PSQLSCRIPT"
echo ";" >> "$PSQLSCRIPT"
echo "" >> "$PSQLSCRIPT"
}
for filetoload in ./*; do
ronumber="$(basename $filetoload)"
# only process files since subdirs can be present
if [[ -f "$filetoload" ]]; then
echo ""
echo "\set invoice"' `cat '"'""$filetoload""'"'`'
echo ", ('$ronumber',:'invoice')"
fi >> "$PSQLSCRIPT"
done
echo "" >> "$PSQLSCRIPT"
echo ";" >> "$PSQLSCRIPT"
echo "" >> "$PSQLSCRIPT"
}
There is a bit other related code that is needed (for my specific usage) but this is the core of it. Use psql variables to capture the contents of each file into a variable and then just perform a normal insert (specifically, a VALUES (...), (...) variant). Since you can intermix psql and SQL you basically output a bloody long script, that has memory issues at scale - but you can divide and conquer - and then "psql --file bloody_long_script_part_1_of_100000.psql".
David J.
