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dump all clickhouse databases and tables
#!/bin/bash
OUTDIR=.
while read -r db ; do
while read -r table ; do
if [ "$db" == "system" ]; then
echo "skip system db"
continue 2;
fi
if [[ "$table" == ".inner."* ]]; then
echo "skip materialized view $table ($db)"
continue;
fi
echo "export table $table from database $db"
# dump schema
clickhouse-client -q "SHOW CREATE TABLE ${db}.${table}" > "${OUTDIR}/${db}_${table}_schema.sql"
# dump
clickhouse-client -q "SELECT * FROM ${db}.${table} FORMAT TabSeparated" | pigz > "${OUTDIR}/${db}_${table}_data.tsv.gz"
done < <(clickhouse-client -q "SHOW TABLES FROM $db")
done < <(clickhouse-client -q "SHOW DATABASES")
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