Solution to the "Too many parts" Error in Data Tables

Troubleshooting

1. Log in to the ClickHouse client and check whether abnormal merge exists.

   select database, table, elapsed, progress, merge_type from system.merges;

2. Do not perform the INSERT operation too frequently, do not insert a small amount of data, and increase the interval for inserting data.
3. The data table partitions are not properly allocated. As a result, too many partitions are generated and data tables need to be re-partitioned.
4. If the MERGE operations are not triggered or slow, adjust the following parameters to accelerate them.

   For details, see Accelerating Merge Operations.

   Configuration Item	Reference Value
   max_threads	Number of CPU cores x 2
   background_pool_size	Number of CPU cores
   merge_max_block_size	The value is an integer multiple of 8192 and is adjusted based on the CPU and memory resources.
   cleanup_delay_period	Set this parameter to a value that is appropriately less than the default value 30.

Changing the Value of parts_to_throw_insert

Increase the value of this parameter only in special scenarios. This configuration acts as a warning for potential issues to some extent. If the cluster hardware resources are insufficient and this configuration is not adjusted properly, potential service issues cannot be detected in a timely manner, which may cause other faults and increase the difficulty of fault recovery.