Performing a Schema Extraction

Prerequisites

Before extracting a schema, you must download the latest EDB DDL Extractor script from the Migration Portal Projects page or from the link provided in the DDL Extractor guide in the Portal Wiki. The script can be run in SQL Developer or SQL*Plus. It uses Oracle’s DBMS_METADATA built-in package to extract DDLs for different objects under schemas (specified while running the script). The EDB DDL extractor creates the DDL file that will be uploaded to the portal and analyzed for EDB Postgres compatibility.

Note: You must have SELECT CATALOG ROLE and SELECT ANY DICTIONARY privileges in the Oracle database.

For SQL*Plus

  1. Connect to SQL*Plus and run the command:

    SQL>@edb_ddl_extractor.sql

  2. Provide the schema name and the pathdirectory in which the extractor will store the extracted DDL. When extracting multiple schemas, use a comma (‘,’) as a delimiter.

Note

If you want to extract all the user schemas from the current database, do not mention any schema names while extracting. However, it is recommended to mention the schema names that you would like to extract.

  1. If you want to extract dependent objects from other schemas, enter yes or no.

    For example, on Linux:

    Enter SCHEMA NAME[S] to extract DDLs:

    HR, SCOTT, FINANCE

    Enter the PATH to store DDL file:

    /home/oracle/extracted_ddls/

    Extract dependent objects from other schemas? (yes/no): yes

    On Windows:

    Enter SCHEMA NAME[S] to extract DDLs:

    HR, SCOTT, FINANCE

    Enter the PATH to store DDL file:

    C:\Users\Example\Desktop\

    Extract dependent objects from other schemas? (yes/no): yes

For SQL Developer

  1. Connect to the SQL server and run the following command:

enter the path for linux or windows

Enter the path for Linux or Windows.

  1. Enter a comma-separated list of schemas:

migration portal image

Provide a list of schemas.

  1. Enter file path for the output file:

specify the output file path

Specify the output file path.

  1. Extract dependent objects from other schemas?(yes/no): yes

specify the output file path

Extracting dependent objects.

Note: You can also enter a single schema name in both the SQL*Plus and SQL Developer tools.

  1. The script iterates through the object types in the source database and once the task is completed, the .SQL output is stored at the entered location, i.e., c:\Users\Example\Desktop\.

Additional Notes

  • The EDB DDL Extractor does not extract objects that have names like:

    BIN$b54+4XIEYwPgUAB/AQBWwA= =$0

    To extract these objects, you must change the name of the objects and re-run the extraction process.

  • DDL Extractor extracts nologging tables as normal tables. Once these tables are migrated to Advanced Server, WAL log files will be created.

Supported Object Types

The migration portal supports the migration of the following object types:

  • Synonyms

  • DB Links

  • Types and Type Body

  • Sequences

  • Tables

  • Constraints

  • Indexes (Except LOB indexes and indexes on materialized views)

  • Views

  • Materialized Views

  • Triggers

  • Functions

  • Procedures

  • Packages

Note

COMMENTS on Columns, Tables, and Materialized Views are supported.

Unsupported Object Types

  • Editions

  • Operators

  • Schedulers

  • LOB indexes and Indexes on Materialized Views

  • XML Schemas

  • Profiles

  • Role and Object Grants

  • Tablespaces

  • Directories

  • Users

  • RLS Policy

  • Queues

Oracle System Schemas

EDB DDL Extractor script will ignore the following system schemas while extracting from Oracle:

ANONYMOUS

APEX_PUBLIC_USER

APEX_030200

APEX_040000

APEX_040200

APPQOSSYS

AUDSYS

BI

CTXSYS

DMSYS

DBSNMP

DIP

DVF

DVSYS

EXFSYS

FLOWS_FILES

FLOWS_020100

GSMADMIN_INTERNAL

GSMCATUSER

GSMUSER

IX

LBACSYS

MDDATA

MDSYS

MGMT_VIEW

OE

OJVMSYS

OLAPSYS

ORDPLUGINS

ORDSYS

ORDDATA

OUTLN

ORACLE_OCM

OWBSYS

OWBYSS_AUDIT

PM

RMAN

SH

SI_INFORMTN_SCHEMA

SPATIAL_CSW_ADMIN_USR

SPATIAL_WFS_ADMIN_USR

SYS

SYSBACKUP

SYSDG

SYSKM

SYSTEM

SYSMAN

TSMSYS

WKPROXY

WKSYS

WK_TEST

WMSYS

XDB

XS$NULL