Clone a MySQL database to a new database on the same server without using a dump file. This is much faster than using mysqldump.
#!/bin/bash | |
DBUSER="root"; | |
DBPASS=""; | |
DBHOST="localhost"; | |
DB_OLD=mydatabase | |
DB_NEW=clone_mydatabase | |
DBCONN="--host=${DBHOST} --user=${DBUSER} --password=${DBPASS}"; | |
MYSQL_CREATE='set foreign_key_checks = 0'; | |
MYSQL_INSERT='set foreign_key_checks = 0'; | |
echo "Begin database clone (may take a while)"; | |
echo -n "-- Do you want to create destination database? (if exists will be dropped) (y/n)?"; | |
read answer | |
if echo "$answer" | grep -iq "^y" ;then | |
DATABASE_COLLATION=$(echo "SELECT @@character_set_database, @@collation_database;" | mysql $DBCONN $DB_OLD | tail -n 1 | awk '{ print $2 }'); | |
echo "DROP DATABASE IF EXISTS ${DB_NEW}; CREATE DATABASE ${DB_NEW} COLLATE ${DATABASE_COLLATION}" | mysql ${DBCONN}; | |
[ $? -ne 0 ] && exit $?; | |
fi | |
echo -e "\n -- Select source table schemas"; | |
MYSQL_TABLES=$(echo "SHOW FULL TABLES WHERE Table_Type = 'BASE TABLE'" | mysql $DBCONN $DB_OLD | tail -n +2 | awk '{ print $1 }'); | |
[ $? -ne 0 ] && exit $?; | |
COUNT=0 | |
for TABLE in $MYSQL_TABLES; do | |
echo -n "${TABLE}"; | |
TABLE="\`${TABLE}\`"; | |
MYSQL_INSERT="${MYSQL_INSERT}; ALTER TABLE ${DB_NEW}.${TABLE} DISABLE KEYS"; | |
MYSQL_INSERT="${MYSQL_INSERT}; INSERT INTO ${DB_NEW}.${TABLE} SELECT * FROM ${DB_OLD}.${TABLE}"; | |
MYSQL_INSERT="${MYSQL_INSERT}; ALTER TABLE ${DB_NEW}.${TABLE} ENABLE KEYS"; | |
CREATE_SQL=$(echo "SHOW CREATE TABLE ${TABLE}" | mysql -B -r ${DBCONN} ${DB_OLD} |tail -n +2 | cut -f 2- | sed -e "s/NOT NULL DEFAULT '0000-00-00 00:00:00'/NOT NULL/g" | sed -e "s/NOT NULL DEFAULT '0000-00-00'/NOT NULL/g"); | |
MYSQL_CREATE="${MYSQL_CREATE}; ${CREATE_SQL}"; | |
[ $? -ne 0 ] && echo && exit $?; | |
echo -e "\t [ok]"; | |
COUNT=$((COUNT+1)) | |
done; | |
echo "-- Total ${COUNT} tables will be cloned ..." | |
MYSQL_CREATE="${MYSQL_CREATE}; set foreign_key_checks = 1"; | |
MYSQL_INSERT="${MYSQL_INSERT}; set foreign_key_checks = 1"; | |
[ $COUNT -gt 1 ] && echo " ]"; | |
echo "-- Create destination table schemas"; | |
echo "${MYSQL_CREATE};" | mysql $DBCONN $DB_NEW | |
[ $? -ne 0 ] && exit $?; | |
echo "-- Insert source data into destination tables"; | |
echo "${MYSQL_INSERT};" | mysql $DBCONN $DB_NEW | |
[ $? -ne 0 ] && exit $?; | |
echo "Done."; |
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You're still saving the sql in the shell then running it. It'll be no quicker than a |
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I'm running into an error when the script tries to insert data into a table with a generated column. Do you if there's a way to detect and omit generated columns from the inserts?
ERROR 3105 (HY000) at line 1: The value specified for generated column 'column_name' in table 'table' is not allowed.
Either way, this is incredibly useful, especially for big databases. Thanks a lot for putting it together.