- What's New
- Function Overview
- Service Overview
- Billing
- Getting Started
-
User Guide
- Permissions Management
- Logging in to a DB Instance
-
MySQL
- Account Management
- Database Management
- SQL Operations
- Table Management
- View Management
- Stored Procedure Management
- Event Management
- Trigger Management
- Function Management
- Data Import and Export
- Data Generator (Not Promoted)
- Tracking and Rolling Back Data (Not Promoted)
- Task Management
- Table Structure Comparison and Synchronization (Not Promoted)
- Intelligent O&M (New Version)
- Intelligent O&M (Old Version)
- RDS for SQL Server
- PostgreSQL
-
RDS for MariaDB
- Account Management
- Database Management
- SQL Operations
- Table Management
- View Management
- Stored Procedure Management
- Event Management
- Trigger Management
- Function Management
- Data Import and Export
- Data Generator (Not Promoted)
- Task Management
- Table Structure Comparison and Synchronization (Not Promoted)
- Intelligent O&M
- GaussDB
-
TaurusDB
- Account Management
- Database Management
- SQL Operations
- Table Management
- View Management
- Event Management
- Stored Procedure Management
- Function Management
- Trigger Management
- Data Import and Export
- Data Generator (Not Promoted)
- Task Management
- Table Structure Comparison and Synchronization (Not Promoted)
- Intelligent O&M
- GeminiDB Cassandra
- GaussDB(DWS) (Unavailable Soon)
- DDS
- DDM
- Audit
- Event Monitoring
- Best Practices
-
API Reference
- Before You Start
- API Overview
- Calling APIs
-
APIs (in OBT)
- API Version Queries
-
Cloud DBA
- Registering a Database User
- Modifying a Database User
- Deleting a Database User
- Querying Intelligent O&M Quotas
- Querying Database User Information
- Querying Database Users
- Killing Sessions
- Querying the SQL Execution Plan (GET Request)
- Querying the SQL Execution Plan (POST Request)
- Querying Metadata Locks
- Querying Instance Sessions
- Querying InnoDB Lock Waits
- Enabling or Disabling SQL Explorer and Slow Query Log
- Querying Whether SQL Explorer and Slow Query Log Are Enabled
- Exporting Slow Query Logs
- Exporting SQL Explorer Data
- Querying Whether SQL Statement Concurrency Control Is Enabled
- Enabling or Disabling SQL Statement Concurrency Control
- Querying Concurrency Control Rules of SQL Statements
- Generate Keywords of a Concurrency Control Rule from the Original SQL Statement
- Creating a Concurrency Control Rule for SQL Statements
- Deleting a Concurrency Control Rule of SQL Statements
- Querying SQL Statement Concurrency Control Tasks
- Exporting the Top SQL Template List
- Exporting SQL Execution Time Distribution
- Exporting the Slow SQL Template List
- Viewing the Instance List on the Intelligent O&M Page
- Setting a Shared Link
- Deleting a Shared Link
- Executing a SQL Diagnosis
- Obtaining Diagnosis Results
- Creating an Instance Diagnosis Task
- Querying Instance Diagnosis Reports
- Obtaining an Instance Diagnosis Report
- Synchronizing the Instance List
- Deprecated APIs
- Permissions Policies and Supported Actions
- Appendixes
-
FAQs
-
Product Consulting
- How Is DAS Billed?
- Which Data Sources Does DAS Support?
- Does DAS Support Multi-Region Access?
- Where Is SQL Execution Records Saved If I Enable This Function?
- What Should I Enter in the Database Column to Log In to a PostgreSQL DB Instance on the DAS Console?
- Will I Be Changed If I Enable Collect Metadata Periodically and Show Executed SQL Statements on the Add Login Page?
-
Managing connections
- What Should I Do If I Can't Connect to My DB Instance Due to Insufficient Permissions?
- What Should I Do If I Can't Connect to My RDS for MySQL Instance?
- What Should I Do If I Can't Connect to My ECS (MySQL) Instance?
- What Should I Do If I Can't Connect to My RDS for SQL Server Instance?
- What Should I Do If I Can't Connect to My ECS (Microsoft SQL Server) Instance?
- What Should I Do If I Can't Connect to My RDS for PostgreSQL Instance?
- What Should I Do If I Can't Connect to My ECS (PostgreSQL) Instance?
- What Should I Do If I Can't Connect to My DDS Instance?
- What Should I Do If I Can't Connect to My GaussDB(for MySQL) Instance?
- What Should I Do If I Can't Connect to My GaussDB Instance?
- What Should I Do If I Can't Connect to My DDM Instance?
- How Do I View and Modify ECS Security Group Rules?
- How Do I View and Modify Firewall Rules?
- What Should I Do If My Connection Fails?
-
Usage
- What Can I Do If Garbled Characters Are Displayed in the Exported Database Result Set?
- What Are the Precautions for Connecting DAS to a Third-Party Client?
- What Are the Username and Password for DAS?
- What Should I Do If Table Obtaining Times Out?
- How Do I Modify the Collation?
- When a user creates a data tracking task, an error message indicating that the current user does not have the OBS operator permissions is displayed.
- Resource Freezing, Release, Deletion, and Unsubscription
-
Product Consulting
- Glossary
- Videos
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More Documents
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User Guide (ME-Abu Dhabi Region)
- Service Overview
- Getting Started
-
User Guide
- Permissions Management
- Logging In to the DAS Console
- Adding Login Information
- Modifying Login Information
- Deleting Login Information
- Logging In to Databases Shared by Others
- MySQL DB Instance Management (Development Tool)
- Microsoft SQL Server DB Instance Management (Development Tool)
- PostgreSQL DB Instance Management (Development Tool)
- DDS DB Instance Management (Development Tool)
- Enterprise Change Approval
- Intelligent O&M
- FAQs
- Change History
-
User Guide (Kuala Lumpur Region)
- Service Overview
- Getting Started
-
User Guide
- Permissions Management
- Logging in to a DB Instance
-
MySQL
- Account Management
- Database Management
- SQL Operations
- Table Management
- View Management
- Stored Procedure Management
- Event Management
- Trigger Management
- Function Management
- Data Import and Export
- Data Generator (Not Promoted)
- Tracking and Rolling Back Data (Not Promoted)
- Task Management
- Table Structure Comparison and Synchronization (Not Promoted)
- Intelligent O&M (New Version)
- Intelligent O&M
- RDS for SQL Server
- PostgreSQL
- DDS
- DDM
- Audit
-
FAQs
-
Managing connections
- What Should I Do If I Can't Connect to My RDS for MySQL Instance?
- What Should I Do If I Can't Connect to My ECS (MySQL) Instance?
- What Should I Do If I Can't Connect to My RDS for PostgreSQL Instance?
- What Should I Do If I Can't Connect to My ECS (PostgreSQL) Instance?
- What Should I Do If I Can't Connect to My DDS Instance?
- What Can I Do If a GaussDB(for MySQL) Instance Fails to Be Connected?
- What Should I Do If I Can't Connect to My GaussDB Instance?
- What Should I Do If I Can't Connect to My DDM Instance?
- How Do I View and Modify ECS Security Group Rules?
- How Do I View and Modify Firewall Rules?
- What Should I Do If My Connection Fails?
- Usage
-
Managing connections
- Change History
-
User Guide (ME-Abu Dhabi Region)
- General Reference
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Maintaining a Table
While working with a database, you do a lot of changes to tables such as inserting, updating and deleting data. This occupies disk space and deteriorates database performance. To handle this, periodic maintenance is required.
Functions
- Check
Allows you to check whether there are errors in database tables using the CHECK TABLE statement. You can check a table with any of the following methods: Check, Quick, Fast, Changed, and Extended.
- Check: scans rows to verify that deleted links are valid. Alternatively, calculate a key checksum for the rows and verifies the validity using the obtained checksum.
- Fast: neither scans rows nor checks for incorrect links.
- Quick: checks only tables that have not been closed properly.
- Changed: checks only the tables that have been changed since the last check and the tables that have not been closed properly.
- Extended: searches for keywords in each row.
The CHECK TABLE statement adds a read-only lock to the table.
- Repair
Allows you to use the REPAIR TABLE statement to repair possibly corrupted or incorrect tables. You can repair tables using any of the following three methods: Check, Quick, and Extended.
- Check: a simple repair, which repairs data and index files.
- Quick: the quickest repair, which repairs only index files, but not data files.
- Extended: the slowest repair, which creates indexes row by row to repair data and index files.
Check
- Log in to the Huawei Cloud console.
- Click
in the upper left corner and select a region and project.
- Click
in the upper left corner, and under Databases, click Data Admin Service.
- In the navigation pane on the left, choose Development Tool.
You can also click Go to Development Tool on the overview page.
- Locate the DB instance that you want to log in to and click Log In in the Operation column.
- On the top menu bar, choose Database Management. On the displayed Objects tab, choose Tables on the left.
- In the right pane, locate the table you want to maintain and choose More > Maintain > Check in the Operation column.
- Select a check method as required.
You can check a table with any of the following methods: Check, Quick, Fast, Changed, and Extended.Figure 1 Selecting a check method
- In the displayed dialog box, click Yes.
Repair
- Log in to the Huawei Cloud console.
- Click
in the upper left corner and select a region and project.
- Click
in the upper left corner, and under Databases, click Data Admin Service.
- In the navigation pane on the left, choose Development Tool.
You can also click Go to Development Tool on the overview page.
- Locate the DB instance that you want to log in to and click Log In in the Operation column.
- On the top menu bar, choose Database Management.
- On the displayed Objects tab, choose Tables on the left.
- Locate the table you want to repair and choose More > Maintain > Repair in the Operation column.
Figure 2 Repair
- Select a repair method as required.
You can repair tables using any of the following three methods: Check, Quick, and Extended.Figure 3 Selecting a repair method
- In the displayed dialog box, click Yes.
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