The uncompressed_cache_size server setting defines the size of the cache of uncompressed blocks. Possible values: Any positive integer. Default value: 128 ✕ 8192. merge_tree_max_bytes_to_use_cache If ClickHouse should read more than merge_tree_max_bytes_to_use_cache bytes in one ...
SELECTtable, formatReadableSize(sum(bytes))assize,min(min_date)asmin_date,max(max_date)asmax_dateFROMsystem.partsWHEREactiveGROUPBYtable; How do I query the size of cold data? To query the size of cold data, you can execute the following sample statement: ...
Themax_execution_timeparameter can be a bit tricky to understand. It operates based on interpolation relative to the current query execution speed (this behaviour is controlled bytimeout_before_checking_execution_speed). ClickHouse will interrupt a query if the projected execution time exceeds the sp...
sudo cp opt/zookeeper/conf/* /etc/zookeeper cat <<EOF | sudo tee /etc/zookeeper/zoo.cfg initLimit=20 syncLimit=10 maxSessionTimeout=60000000 maxClientCnxns=2000 preAllocSize=131072 snapCount=3000000 dataDir=/var/lib/zookeeper/data dataLogDir=/var/lib/zookeeper/logs # use low-latency disk!
ClickHouse的资源使用都是从查询thread级别就开始进行追踪,主要的相关代码在 ThreadStatus 类中。每个查询线程都会有一个thread local的ThreadStatus对象,ThreadStatus对象中包含了对内存使用追踪的 MemoryTracker、profile cpu time的埋点对象 ProfileEvents、以及监控thread 热点线程栈的 QueryProfiler。
Describe what's wrong You can use max_parser_depth to control the stack size. It's default value is 1000. User can increase it if there are really large queries that exceed this limit. But setting it too high (in my example below to 100,...
max_open_files max_table_size_to_drop merge_tree openSSL part_log path query_log query_thread_log trace_log query_masking_rules remote_servers timezone tcp_port tcp_port_secure mysql_port tmp_path tmp_policy uncompressed_cache_size user_files_path users_config zookeeper use_minimalistic_part_...
During AST fuzzer test we cannot access minio for 10 times with exponential backoff retry interval from 50 ms up to 12800 ms. This sums up to 28 seconds, which exceed query execution timeout 10 seconds, so an exception is thrown and QueryPipeline is destructed, after which we got not fin...
kafka_max_block_size No The maximum size of Kafka messages that can be written to the table in each batch. Default value: 65536. Unit: bytes. kafka_skip_broken_messages No The tolerance of the Kafka message parser to dirty data. Default value: 0. If you set kafka_skip_broken_...
Now we have a new storage setting max_partitions_to_read for tables in the MergeTree family. It limits the max number of partitions that can be accessed in one query. A user setting force_max_partition_limit is also added to enforce this constraint. #18712 (Amos Bird). Add query_id col...