TaurusDB
TaurusDB
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- Function Overview
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User Guide
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- Database Management
- Account Management (Non-Administrator)
- Data Security
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- Data Restorations
- Connection Management
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Parameter Template Management
- Creating a Parameter Template
- Modifying a Parameter Template
- Exporting Parameters
- Comparing Parameter Templates
- Viewing Parameter Change History
- Replicating a Parameter Template
- Resetting a Parameter Template
- Applying a Parameter Template
- Viewing Application Records of a Parameter Template
- Editing a Parameter Template Description
- Deleting a Parameter Template
- Metrics and Alarms
- Interconnection with CTS
- Log Management
- Task Center
- Managing Tags
- Managing Quotas
- Change History
- Best Practices
- Performance White Paper
- Security White Paper
- SDK Reference
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API Reference
- Before You Start
- API Overview
- Calling APIs
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APIs (Recommended)
- DB Engine Version Queries
- Database Specification Queries
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Instance Management
- Creating a DB Instance
- Querying DB Instances
- Rebooting a DB Instance
- Deleting a DB Instance
- Querying Details of a DB Instance
- Querying Details of DB Instances in Batches
- Creating a Read Replica
- Deleting a Read Replica
- Scaling up Storage of a Yearly/Monthly DB Instance
- Changing a DB Instance Name
- Resetting a Database Password
- Changing DB Instance Specifications
- Querying Dedicated Resource Pools
- Querying Dedicated Resources
- Configuring the Monitoring By Seconds Function
- Querying the Configuration of Monitoring by Seconds
- Enabling or Disabling SSL
- Binding an EIP
- Unbinding an EIP
- Promoting a Read Replica to Primary
- Changing a Maintenance Window
- Modifying a Security Group
- Changing a Private IP Address
- Changing a Database Port
- Changing a DB Instance Description
- Backup Management
- Parameter Template Management
- Quota Management
- Log Management
- Tag Management
- Database User Management
- Database Management
- SQL Statement Concurrency Control
- Task Center
- APIs (Unavailable Soon)
- Permissions Policies and Supported Actions
- Appendix
- Change History
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FAQs
- Product Consulting
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Database Connections
- Can an External Server Access the GaussDB(for MySQL) Database?
- What Do I Do If the Number of GaussDB(for MySQL) Database Connections Reaches the Upper Limit?
- What Is the Maximum Number of Connections to a GaussDB(for MySQL) Instance?
- What Should I Do If an ECS Cannot Connect to a GaussDB(for MySQL) Instance?
- How Can I Connect to a MySQL Database Through JDBC?
- How Can I Create and Connect to an ECS?
- What Should I Do If a Database Client Problem Causes a Connection Failure?
- Why Cannot I Ping My EIP After It Is Bound to a DB Instance?
- What Can I Do If the Connection Test Failed?
- Can I Access a GaussDB(for MySQL) Instance over an Intranet Connection Across Regions?
- Are There Any Potential Risks If There Are Too Many Connections to a GaussDB(for MySQL) Instance?
- What Should I Do If an ECS and a GaussDB(for MySQL) instance Deployed in Different VPCs Cannot Communicate with Each Other?
- How Do I View All IP Addresses Connected to a Database?
- Client Installation
- Database Migration
- Database Permissions
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Database Performance
- What Should I Do If the CPU Usage of My Instance Is High?
- How Do I Handle Slow SQL Statements Caused by Inappropriate Composite Index Settings?
- How Do I Handle a Large Number of Temporary Tables Being Generated for Long Transactions and High Memory Usage?
- What Should I Do If Locks on Long Transactions Block the Execution of Subsequent Transactions?
- Database Usage
- Backups
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Database Parameter Modification
- How Can I Change the Time Zone?
- How Do I Configure a Password Expiration Policy for GaussDB(for MySQL) Instances?
- How Do I Ensure that the Database Character Set of a GaussDB(for MySQL) Instance Is Correct?
- How Do I Use the utf8mb4 Character Set to Store Emojis in a GaussDB(for MySQL) Instance?
- How Do I Set Case Sensitivity for GaussDB(for MySQL) Table Names?
- Can I Use SQL Commands to Modify Global Parameters?
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Network Security
- What Security Assurance Measures Does GaussDB(for MySQL) Have?
- How Can I Prevent Untrusted Source IP Addresses from Accessing GaussDB(for MySQL)?
- How Do I Configure a Security Group to Enable Access to a GaussDB(for MySQL) Instance?
- How Can I Import the Root Certificate to a Windows or Linux Server?
- How Do I Manage and Ensure GaussDB(for MySQL) Security?
- Log Management
- Version Upgrade
- Change History
-
Troubleshooting
-
Backup and Restoration Issues
- Insufficient Permissions During Data Export Using mysqldump
- How Do I use mysqlbinlog to Obtain Binlog Files?
- Canal Fails to Parse Binlogs
- Precautions for Exporting Large Tables Through mysqldump
- Commands for Exporting Data Through mysqldump
- System Inaccessible After Field Addition to a Database Table
- SQL Statements Such as SET @@SESSION.SQL_LOG_BIN Displayed After You Run mysqldump
- Insufficient Permissions Reported for Canal
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Connection Issues
- Login Failed After ssl_type of root Is Changed to ANY
- Failed to Connect to a DB Instance Using SSL
- Description of Each IP Address
- SSL Connection Failed Due to Inconsistent TLS Versions
- Error Message "connection established slowly"
- "Access denied" Displayed During Database Connection
- Failed to Connect to a Database Using mariadb-connector in SSL Mode
- Failed to Connect to a Database as User root
- Client Automatically Disconnected from a DB Instance
- Disconnection Occurs Every 45 Days Due to the istio-citadel Certificate Mechanism
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SQL Issues
- Invalid TIMESTAMP Default Value during Table Creation
- Failed to Change the VARCHAR Length Due to the Index Length Limit
- Slow SQL Queries After a Large Amount of Data Is Deleted from a Large Table
- Error 1366 Reported When Data Containing Emojis Is Updated
- Slow Stored Procedure Execution Due to Inconsistent Collations
- ERROR [1412] Reported for a DB Instance
- Failed to Delete a Table with a Foreign Key
- Incorrect GROUP_CONCAT Results
- Error Message "Too many keys specified" Displayed When a Secondary Index Is Created
- DISTINCT and GROUP BY Optimization
- Equivalent Comparison Failures with Floating-Point Numbers
- Tablespace Bloat
- ERROR 1396 Reported When a User Is Created
- Error Message Reported When alter table xxx discard/import tablespace Is Executed
- Native Error 1461 Reported by a DB Instance
- "Row size too large" Reported When a Table Failed to Be Created
- Parameter-related Issues
- Performance Issues
-
Basic Issues
- How Do I View Used Storage of My GaussDB(for MySQL) Instance?
- Renaming Databases and Tables
- Character Set and Collation Settings
- Auto-Increment Field Value Jump
- Starting Value and Increment of AUTO_INCREMENT
- Changing the AUTO_INCREMENT Value of a Table
- Failed to Insert Data Because Values for the Auto-increment Primary Key Field Reach the Upper Limit
- Auto-increment Field Values
- AUTO_INCREMENT Not Displayed in the Table Structure
- Impact of Creating an Empty Username
- No Scanned Rows Recorded in Slow Query Logs
- Change History
-
Backup and Restoration Issues
- Videos
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What Do I Do If the Number of GaussDB(for MySQL) Database Connections Reaches the Upper Limit?
What Do I Do If the Number of GaussDB(for MySQL) Database Connections Reaches the Upper Limit?
Updated on 2023-10-19 GMT+08:00
The number of database connections indicates the number of applications that can be simultaneously connected to a database, and is irrelevant to the maximum number of users allowed by your applications or websites.
If there is an excessive number of database connections, applications may fail to be connected, and the full and incremental backups may fail, affecting services.
Fault Locating
- Check whether applications are connected, optimize the connections, and release unnecessary connections.
- Check the specifications and scale them up if needed.
- Check whether any metrics are abnormal and whether any alarms are generated on the Cloud Eye console. Cloud Eye monitors database metrics, such as the CPU usage, memory usage, storage space usage, and database connections, and allows you to configure alarm policies to identify risks in advance if any alarms are generated. For details, see the Cloud Eye User Guide.
Solution
- Connect to an instance through a private network. Using a private network prevents congestion caused by insufficient bandwidth.
- On the console, set the parameter innodb_adaptive_hash_index to off to reduce lock wait time.
For details, see Modifying a Parameter Template.
- Optimize slow queries.
Parent topic: Database Connections
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