tencent cloud

TDSQL Boundless

Release Notes
Product Introduction
Overview
Scenarios
Product Architecture
Instance Types
Compatibility Notes
Kernel Features
Kernel Overview
Kernel Version Release Notes
Functionality Features
Performance Features
Billing
Billing Overview
Purchase Method
Pricing Details
Renewal
Overdue Payments
Refund
Getting Started
Creating an Instance
Connect to Instances
User Guide
Data Migration
Data Subscription
Instance Management
Configuration Change
Parameter Configuration
Account Management
Security Group
Backup and Restoration
Database Auditing
Tag Management
Use Cases
Technical Evolution and Usage Practices of Online DDL
Lock Mechanism Analysis and Troubleshooting Practices
Data Intelligent Scheduling and Related Practices for Performance Optimization
TDSQL Boundless Selection Guide and Practical Tutorial
Developer Guide
Developer Guide (MySQL Compatibility Mode)
Developer Guide (HBase Compatibility Mode)
Performance Tuning
Performance Tuning Overview
SQL Tuning
DDL Tuning
Performance White Paper
Performance Overview
TPC-C Test
Sysbench Test
API Documentation
History
Introduction
API Category
Making API Requests
Instance APIs
Security Group APIs
Task APIs
Backup APIs
Rollback APIs
Parameter APIs
Database APIs
Data Types
Error Codes
General Reference
System Architecture
SQL Reference
Database Parameter Description
TPC-H benchmark data model reference
Error Code Information
Security and Compliance
FAQs
Agreements
Service Level Agreement
Terms of Service
Privacy Policy
Data Processing And Security Agreement
Contact Us
Glossary
DokumentasiTDSQL BoundlessGeneral ReferenceDatabase Parameter Descriptiontdstore_user_cf_level0_stop_writes_trigger

tdstore_user_cf_level0_stop_writes_trigger

PDF
Mode fokus
Ukuran font
Terakhir diperbarui: 2026-03-27 19:14:34

Feature Description

TDStore uses the LSM-tree structure to organize and store data. The LSM-tree organizes data in hierarchical levels, ranging from Level 0 to Level N. Newly written data is first flushed to Level 0. The LSM-tree periodically initiates compaction operations to reorganize stored data, gradually moving data from upper levels to lower levels to maintain an optimal state. During this process, expired versions of data are cleaned up to release redundant disk space, achieving optimal read and write performance. When the database experiences excessive write pressure and compaction operations cannot reorganize newly written data in time, the LSM-tree structure degrades, leading to reduced read and write performance. Upon reaching a certain threshold, TDStore automatically enters a write-throttling state (limiting the speed of write requests) or even a write-rejection state (rejecting all write requests). At this point, TDStore's write performance reaches a bottleneck.
tdstore_user_cf_level0_stop_writes_trigger is used to set the threshold for TDStore to enter the write-rejection state. When the number of data files at LSM-tree level 0 exceeds this parameter, TDStore will enter the write-rejection state and reject all write requests. By properly setting tdstore_user_cf_level0_stop_writes_trigger, you can control the threshold for entering the write-rejection state, thereby optimizing system performance and resource utilization.

Attribute Description

Required
Description
Parameter Type
UINT
Default Value
128
Value Range
1 ~ 2147483647
Effective Scope
GLOBAL
Restart Required
No
Topik sebelumnya: tdstore_user_cf_level0_slowdown_writes_triggerTopik selanjutnya: tdstore_user_cf_soft_pending_compaction_bytes_limit

Bantuan dan Dukungan

Apakah halaman ini membantu?

masukan