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Cluster parameters

Last Updated: Jun 25, 2021

This topic describes the current cluster parameters.

Parameters

Parameter

Description

sys_bkgd_io_low_percentage

Specifies the minimum percentage of system background I/Os. If the value is 0, the system automatically sets this parameter based on the environment.

clog_transport_compress_all

Specifies whether to compress transaction logs for transfer.

enable_rebalance

Specifies whether to enable automatic load balancing among partitions.

location_refresh_thread_count

Specifies the number of threads for refreshing the location cache.

location_cache_expire_time

Specifies the retention time of cached objects in the location cache.

force_refresh_location_cache_threshold

specifies the maximum numbers of location cache refreshes allowed in one second. Throttling is triggered when this threshold is reached.

max_stale_time_for_weak_consistency

Specifies the maximum delay allowed in weak consistency reads.

multiblock_read_gap_size

Specifies the maximum size of data that can be read from the block cache in one I/O aggregate read.

user_tab_col_stat_cache_priority

Specifies the priority of the statistics cache in the cache system.

multiblock_read_size

Specifies the I/O aggregate throughput in data access.

sys_bkgd_io_high_percentage

Specifies the maximum percentage of system background I/Os.

fuse_row_cache_priority

Specifies the priority of the fuse row cache in the cache system.

force_refresh_location_cache_interval

Specifies the maximum interval for refreshing the location cache.

sys_bkgd_net_percentage

Specifies the percentage of network bandwidth for background tasks.

index_cache_priority

Specifies the priority of the index in the cache system.

clog_cache_priority

Specifies the caching priority of transaction logs.

large_query_threshold

Specifies the execution time threshold at which a query is deemed a large query. When this threshold is reached, large query scheduling policies are executed.

micro_block_merge_verify_level

Specifies the validation level of macro blocks in a major compaction.

bf_cache_priority

Specifies the caching priority of the Bloom filter.

bf_cache_miss_count_threshold

Specifies the number of macro block misses that triggers the creation of the Bloom filter cache. When the value is set to 0, this feature is disabled.

user_block_cache_priority

Specifies the priority of the block index in the cache system.

memory_reserved

Specifies the size of the reserved memory.

builtin_db_data_verify_cycle

Specifies the cycle of bad block check in the unit of days. When the value is set to 0, bad block check is not performed.

partition_table_scan_batch_count

Specifies the number of replicas that can be pre-read in a batch during a partition table traversal.

sys_cpu_limit_trigger

Specifies the CPU utilization threshold at which background tasks will be suspended.

location_fetch_concurrency

Specifies the maximum number of concurrent location cache information updates.

index_clog_cache_priority

Specifies the priority of the transaction log index in the cache system.

virtual_table_location_cache_expire_time

Specifies the expiration time of the location cache of the virtual table.

location_cache_refresh_min_interval

Specifies the minimum interval for sending location cache refresh requests, to prevent excessive refresh requests from overloading the system.

clog_transport_compress_func

Specifies the algorithm for compressing transaction logs for internal transfer.

trx_try_wait_lock_timeout

Specifies the maximum amount of time that a statement waits for a locked row to be unlocked.