Created
July 28, 2011 21:12
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Script to transfer a database table quickly without temporary files
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#!/bin/sh | |
# Modify the source and target variables, and run: | |
# $./transfer table_name | |
# Note that this will only run on the same machine as the target MySQL server machine. | |
SOURCE_MYSQL_HOST= | |
SOURCE_MYSQL_PORT= | |
SOURCE_MYSQL_USERNAME= | |
SOURCE_MYSQL_PASSWORD= | |
SOURCE_MYSQL_DATABASE=source | |
TARGET_MYSQL_HOST=localhost | |
TARGET_MYSQL_PORT=3306 | |
TARGET_MYSQL_USERNAME=root | |
TARGET_MYSQL_PASSWORD= | |
TARGET_MYSQL_DATABASE=target | |
TABLE=$1 | |
MYSQL_CLI=`which mysql` | |
SOURCE_CLI="$MYSQL_CLI --host=$SOURCE_MYSQL_HOST --port=$SOURCE_MYSQL_PORT --user=$SOURCE_MYSQL_USERNAME --password=$SOURCE_MYSQL_PASSWORD --database=$SOURCE_MYSQL_DATABASE -BCN" | |
TARGET_CLI="$MYSQL_CLI --host=$TARGET_MYSQL_HOST --port=$TARGET_MYSQL_PORT --user=$TARGET_MYSQL_USERNAME --password=$TARGET_MYSQL_PASSWORD --database=$TARGET_MYSQL_DATABASE -BCN" | |
echo "Recreating table structure for" $TABLE | |
$TARGET_CLI -e "DROP TABLE IF EXISTS $TABLE" | |
CREATE_SQL=`$SOURCE_CLI -qe "SHOW CREATE TABLE $TABLE" | sed '1s/.*CREATE TABLE/CREATE TABLE/'` | |
$TARGET_CLI -e "$CREATE_SQL" 1> /dev/null | |
echo "Transferring table" $TABLE | |
$SOURCE_CLI -qe "SELECT 'Number of records to import:', COUNT(1) FROM $TABLE" | |
PIPE_FILENAME=$PWD/mysql_pipe.csv | |
mkfifo $PIPE_FILENAME | |
$SOURCE_CLI -qe "SELECT * FROM $TABLE" | perl -pe 's/\r/\\r/g;s/(^|\t)NULL(?=\t|$)/\1\\N/g' > $PIPE_FILENAME & | |
time $TARGET_CLI -qe "LOAD DATA INFILE '$PIPE_FILENAME' INTO TABLE $TABLE FIELDS TERMINATED BY '\t'" | |
rm $PIPE_FILENAME | |
$TARGET_CLI --batch -e "SELECT 'Number of imported records:', COUNT(1) FROM $TABLE" |
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