tencent cloud

TDSQL Boundless

Release Notes
Product Introduction
Overview
Scenarios
Product Architecture
Instance Types
Compatibility Notes
Usage specification recommendations
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
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 Descriptiontable_definition_cache

table_definition_cache

PDF
Mode fokus
Ukuran font
Terakhir diperbarui: 2026-03-27 17:54:08

Feature Description

table_definition_cache is used to set the number of cached table definition objects. The table definition cache stores metadata (such as column names and data types) of the tables in the database so that this information can be quickly accessed during query execution. When this limit is reached, the system disables the least recently used table definitions based on the least recently used (LRU) algorithm to free up space for new table definitions.
Note:
It is recommended to substitute table_open_cache for the table_definition_cache parameter.

Attribute Description

Required
Description
Parameter Type
ULONG
Default Value
4294967295
Value Range
400 ~ 4294967295
Effective Scope
GLOBAL
Restart Required
No
Topik sebelumnya: sql_require_primary_keyTopik selanjutnya: table_open_cache

Bantuan dan Dukungan

Apakah halaman ini membantu?

masukan