- What's New
- Service Overview
- Getting Started
-
User Guide
- Database Evaluation
- Object Migration
- SQL Statement Conversion
- Conversion Configuration
- SQL Audit
- Data Source Management
- Permissions Management
- Interconnection with CTS
- Best Practices
- Security White Paper
-
API Reference
- Before You Start
- API Types
- Calling APIs
-
API
- API Version Management
- Quota Management
- SQL Statement Conversion
- Evaluation Project
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Migration Project
- Creating a Migration Project
- Querying Migration Projects
- Querying the Status of a Migration Project
- Checking Target Database Permissions
- Querying Permission Check Results
- Querying Migration Project Details
- Submitting Syntax Conversion of Objects
- Querying Syntax Conversion Progress of Objects
- Submitting Verification
- Querying the Verification Progress
- Downloading a Migration Error Report
- Deleting a Migration Project
- Permissions Policies and Supported Actions
- Appendixes
- SDK Reference
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FAQs
-
Product Consulting
- Instance Freezing, Release, and Deletion
- Which Schemas in Source Databases Are Ignored for Migration?
- What Are the Differences Between Syntax Conversion and Migration & Verification in a Migration Project?
- What Are the Database Schema Changes After an Oracle Database Is Migrated to the Target Database?
- Why Cannot I Use Some Functions?
- What Is the Function of the dsc_ora_ext Schema Generated After Migration to the Target Database?
- What Should I Do If Data Collection Fails or Is Slow Due to the Small Values of Certain Oracle SGA Parameters?
- What Should I Do If Data Collection Fails and a Message SNAPSHOT TOO OLD Is Displayed?
- What Is the Mapping Between the GaussDB Versions Displayed on the UGO Console and Self-built GaussDB Versions?
- What Are VPCEP Resource Quotas?
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Database Connections
- What Should I Do If I Cannot Connect to the Source Oracle Database During Database Evaluation Project Creation?
- What Should I Do If I Failed To Connect to the Source Database as User sys?
- How Do I Create GaussDB Databases Compatible with Source Databases?
- What Should I Do If My Database Fails to be Connected?
- SQL Server Connection Test Failed (Error Code=0, SQLState=08S01)
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Evaluation Project
- How Do I Select a Connection Method?
- How Does UGO Collect Data from Source Databases?
- How Does UGO Check Database Permissions?
- What Are the Possible Causes for an Object Collection Failure?
- In GaussDB, How Do I Configure a Search Path If A Statement Without Schema Name Fails To Be Executed?
- What Is Native Compatibility, Conversion Compatibility, Partial Compatibility, or Incompatibility?
- What Is the Relationship Between Migration Risk (Top 10 risk SQL) and Risky SQL Summary?
- What Are Reconstruction Statistics and How Are Reconstruction Points Measured?
- What Should I Do If An Object Collection Error (Closed Connection) Is Displayed During Evaluation Project Creation?
- What Should I Do If "ErrorCode=4036" Is Displayed During Evaluation Project Creation?
- What Should I Do If "ErrorCode=17002" Is Displayed During Evaluation Project Creation?
- What Do I Do If the Assessment Task Is Connected but the Pre-check Fails?
- What Is the Impact of the Collection on the Source Database?
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Migration Project
- Why Is There No Available Evaluation Project During Migration Project Creation?
- When Should I Use the Conversion Config Function?
- What Should I Do If SQL Modifications Failed to Be Saved During Object Correction?
- How Do I Solve ERROR: syntax error at or near "@"?
- What Are the Possible Causes for an Object Verification Failure?
- What Are the Impacts of GUC Parameter Settings of GaussDB on Migration?
- How Do I Set GaussDB GUC Parameters?
- Why Is the Number of Indexes Different After Oracle Data is Migrated to GaussDB?
- What Should I Do If There Are ctid, xc_node_id, and tableoid Columns in GaussDB?
- Why Is Data Inconsistent When SELECT Statements Without ORDER BY Are Used for Query in Distributed GaussDB?
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Product Consulting
- Videos
- General Reference
Copied.
Preparing for the Migration
Permissions
- The permission check for the source database must be passed. Table 1 lists the permissions that need to be checked when the source database type is Oracle.
Table 1 Required checks Check Item
Description
Mandatory
DBMS_METADATA
Permission to retrieve metadata from the Oracle database dictionary. This permission is used to obtain the DDL of schema objects.
Granting the DBA permission:
Yes
Dynamic View
Permission to access various dynamic performance views. This permission is used to obtain basic database information.
DBA permission needs to be granted.
Yes
Schema Objects
Permission to check schema objects to be evaluated. At least one object needs to be evaluated.
Yes
DBA
DBA permission required for subsequent operations.
No
If Check Result is Alarm, some objects could not be collected because of permissions, but the evaluation project can still be created successfully.
- When connecting to the target database, you must have the permissions needed to create, delete, and modify databases objects, such as schemas, tables, programs, indexes, users, functions, and views.
- You have the permissions needed to create an evaluation project. For details, see Permission Management.
Network Settings
- Network settings for a source database:
Currently, schemas of Oracle databases can be migrated to Huawei Cloud GaussDB databases only over a public network.
You need to enable public access for your on-premises Oracle database.
- Network settings for a target database:
If a source database attempts to access the GaussDB database over a public network, no additional network settings are required.
Security Rules
- EIP of a UGO instance:
Log in to the UGO console. Choose Schema Migration > DB Evaluation and click Create Project. On the Basic Details tab page, you can see the EIP.
- Security rules for a source database:
Add the UGO instance EIP to the trustlist of the source Oracle database.
- Security rules for the target database:
Add the UGO instance EIP to the trustlist of the target GaussDB database.
The preceding database trustlist is used only for UGO-based collection and migration. After the collection and migration, you can delete the EIP from the trustlist.
Other
- You are advised to use a database in a non-production environment.
- You have obtained the IP address, port number, username, and password of the Oracle database to be migrated.
- System databases are maintained by the database system. An object cannot be created on the system databases, so they are not recommended for object migration.
- The target database to be connected is normal and has no arrears or suspension.
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