Pending mutations clickhouse
Find stuck ALTER/DELETE mutations with failure reason; blocks schema changes
clickhouse-client -q "SELECT database, table, mutation_id, latest_fail_reason FROM system.mutations WHERE is_done=0"
more clickhouse
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Connect to clickhouse-client
clickhouse-client -h clickhouse -u default --password <pass> --database mydb
Show databases
clickhouse-client -q 'SHOW DATABASES'
Show tables
clickhouse-client -q 'SHOW TABLES FROM mydb'
Table size
clickhouse-client -q "SELECT table, formatReadableSize(sum(bytes)) AS size FROM system.parts WHERE active AND database='mydb' GROUP BY table ORDER BY sum(bytes) DESC"
Running queries
clickhouse-client -q 'SELECT query_id, user, elapsed, query FROM system.processes ORDER BY elapsed DESC'