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README
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NAME
Ora2Pg - Oracle to PostgreSQL database schema converter
DESCRIPTION
Ora2Pg is a free tool used to migrate an Oracle database to a PostgreSQL
compatible schema. It connects your Oracle database, scans it
automatically and extracts its structure or data, then generates SQL
scripts that you can load into your PostgreSQL database.
Ora2Pg can be used for anything from reverse engineering Oracle database
to huge enterprise database migration or simply replicating some Oracle
data into a PostgreSQL database. It is really easy to use and doesn't
require any Oracle database knowledge other than providing the
parameters needed to connect to the Oracle database.
FEATURES
Ora2Pg consist of a Perl script (ora2pg) and a Perl module (Ora2Pg.pm),
the only thing you have to modify is the configuration file ora2pg.conf
by setting the DSN to the Oracle database and optionally the name of a
schema. Once that's done you just have to set the type of export you
want: TABLE with constraints, VIEW, MVIEW, TABLESPACE, SEQUENCE,
INDEXES, TRIGGER, GRANT, FUNCTION, PROCEDURE, PACKAGE, PARTITION, TYPE,
INSERT or COPY, FDW, QUERY, KETTLE, SYNONYM.
By default Ora2Pg exports to a file that you can load into PostgreSQL
with the psql client, but you can also import directly into a PostgreSQL
database by setting its DSN into the configuration file. With all
configuration options of ora2pg.conf you have full control of what
should be exported and how.
Features included:
- Export full database schema (tables, views, sequences, indexes), with
unique, primary, foreign key and check constraints.
- Export grants/privileges for users and groups.
- Export range/list partitions and sub partitions.
- Export a table selection (by specifying the table names).
- Export Oracle schema to a PostgreSQL 8.4+ schema.
- Export predefined functions, triggers, procedures, packages and
package bodies.
- Export full data or following a WHERE clause.
- Full support of Oracle BLOB object as PG BYTEA.
- Export Oracle views as PG tables.
- Export Oracle user defined types.
- Provide some basic automatic conversion of PLSQL code to PLPGSQL.
- Works on any platform.
- Export Oracle tables as foreign data wrapper tables.
- Export materialized view.
- Show a report of an Oracle database content.
- Migration cost assessment of an Oracle database.
- Migration difficulty level assessment of an Oracle database.
- Migration cost assessment of PL/SQL code from a file.
- Migration cost assessment of Oracle SQL queries stored in a file.
- Generate XML ktr files to be used with Penthalo Data Integrator (Kettle)
- Export Oracle locator and spatial geometries into PostGis.
- Export DBLINK as Oracle FDW.
- Export SYNONYMS as views.
- Export DIRECTORY as external table or directory for external_file extension.
- Dispatch a list of SQL orders over multiple PostgreSQL connections
- Perform a diff between Oracle and PostgreSQL database for test purpose.
- MySQL/MariaDB and Microsoft SQL Server migration.
Ora2Pg does its best to automatically convert your Oracle database to
PostgreSQL but there's still manual works to do. The Oracle specific
PL/SQL code generated for functions, procedures, packages and triggers
has to be reviewed to match the PostgreSQL syntax. You will find some
useful recommendations on porting Oracle PL/SQL code to PostgreSQL
PL/PGSQL at "Converting from other Databases to PostgreSQL", section:
Oracle (http://wiki.postgresql.org/wiki/Main_Page).
See http://ora2pg.darold.net/report.html for a HTML sample of an Oracle
database migration report.
INSTALLATION
All Perl modules can always be found at CPAN (http://search.cpan.org/).
Just type the full name of the module (ex: DBD::Oracle) into the search
input box, it will brings you the page for download.
Releases of Ora2Pg stay at SF.net
(https://sourceforge.net/projects/ora2pg/).
Under Windows you should install Strawberry Perl
(http://strawberryperl.com/) and the OSes corresponding Oracle clients.
Since version 5.32 this Perl distribution include pre-compiled driver of
DBD::Oracle and DBD::Pg.
Requirement
The Oracle Instant Client or a full Oracle installation must be
installed on the system. You can download the RPM from Oracle download
center:
rpm -ivh oracle-instantclient12.2-basic-12.2.0.1.0-1.x86_64.rpm
rpm -ivh oracle-instantclient12.2-devel-12.2.0.1.0-1.x86_64.rpm
rpm -ivh oracle-instantclient12.2-jdbc-12.2.0.1.0-1.x86_64.rpm
rpm -ivh oracle-instantclient12.2-sqlplus-12.2.0.1.0-1.x86_64.rpm
or simply download the corresponding ZIP archives from Oracle download
center and install them where you want, for example:
/opt/oracle/instantclient_12_2/
You also need a modern Perl distribution (perl 5.10 and more). To
connect to a database and proceed to his migration you need the DBI Perl
module > 1.614. To migrate an Oracle database you need the DBD::Oracle
Perl modules to be installed.
To install DBD::Oracle and have it working you need to have the Oracle
client libraries installed and the ORACLE_HOME environment variable must
be defined.
If you plan to export a MySQL database you need to install the Perl
module DBD::MySQL which requires that the mysql client libraries are
installed.
If you plan to export a SQL Server database you need to install the Perl
module DBD::ODBC which requires that the unixODBC package is installed.
On some Perl distribution you may need to install the Time::HiRes Perl
module.
If your distribution doesn't include these Perl modules you can install
them using CPAN:
perl -MCPAN -e 'install DBD::Oracle'
perl -MCPAN -e 'install DBD::MySQL'
perl -MCPAN -e 'install DBD::ODBC'
perl -MCPAN -e 'install Time::HiRes'
otherwise use the packages provided by your distribution.
Optional
By default Ora2Pg dumps export to flat files, to load them into your
PostgreSQL database you need the PostgreSQL client (psql). If you don't
have it on the host running Ora2Pg you can always transfer these files
to a host with the psql client installed. If you prefer to load export
'on the fly', the perl module DBD::Pg is required.
Ora2Pg allows you to dump all output in a compressed gzip file, to do
that you need the Compress::Zlib Perl module or if you prefer using
bzip2 compression, the program bzip2 must be available in your PATH.
If your distribution doesn't include these Perl modules you can install
them using CPAN:
perl -MCPAN -e 'install DBD::Pg'
perl -MCPAN -e 'install Compress::Zlib'
otherwise use the packages provided by your distribution.
Instruction for SQL Server
For SQL Server you need to install the unixodbc package and the Perl
DBD::ODBC driver:
sudo apt install unixodbc
sudo apt install libdbd-odbc-perl
or
sudo yum install unixodbc
sudo yum install perl-DBD-ODBC
sudo yum install perl-DBD-Pg
then install the Microsoft ODBC Driver for SQL Server. Follow the
instructions relative to your operating system from here:
https://docs.microsoft.com/fr-fr/sql/connect/odbc/linux-mac/installing-the-microsoft-odbc-driver-for-sql-server?view=sql-server-ver16
Once it is done set the following in the /etc/odbcinst.ini file by
adjusting the SQL Server ODBC driver version:
[msodbcsql18]
Description=Microsoft ODBC Driver 18 for SQL Server
Driver=/opt/microsoft/msodbcsql18/lib64/libmsodbcsql-18.0.so.1.1
UsageCount=1
See ORACLE_DSN to know how to use the driver to connect to your MSSQL
database.
Installing Ora2Pg
Like any other Perl Module Ora2Pg can be installed with the following
commands:
tar xjf ora2pg-x.x.tar.bz2
cd ora2pg-x.x/
perl Makefile.PL
make && make install
This will install Ora2Pg.pm into your site Perl repository, ora2pg into
/usr/local/bin/ and ora2pg.conf into /etc/ora2pg/.
On Windows(tm) OSes you may use instead:
perl Makefile.PL
gmake && gmake install
This will install scripts and libraries into your Perl site installation
directory and the ora2pg.conf file as well as all documentation files
into C:\ora2pg\
To install ora2pg in a different directory than the default one, simply
use this command:
perl Makefile.PL PREFIX=<your_install_dir>
make && make install
then set PERL5LIB to the path to your installation directory before
using Ora2Pg.
export PERL5LIB=<your_install_dir>
ora2pg -c config/ora2pg.conf -t TABLE -b outdir/
Packaging
If you want to build the binary package for your preferred Linux
distribution take a look at the packaging/ directory of the source
tarball. There is everything to build RPM, Slackware and Debian
packages. See README file in that directory.
Installing DBD::Oracle
Ora2Pg needs the Perl module DBD::Oracle for connectivity to an Oracle
database from perl DBI. To get DBD::Oracle get it from CPAN a perl
module repository.
After setting ORACLE_HOME and LD_LIBRARY_PATH environment variables as
root user, install DBD::Oracle. Proceed as follow:
export LD_LIBRARY_PATH=/usr/lib/oracle/12.2/client64/lib
export ORACLE_HOME=/usr/lib/oracle/12.2/client64
perl -MCPAN -e 'install DBD::Oracle'
If you are running for the first time it will ask many questions; you
can keep defaults by pressing ENTER key, but you need to give one
appropriate mirror site for CPAN to download the modules. Install
through CPAN manually if the above doesn't work:
#perl -MCPAN -e shell
cpan> get DBD::Oracle
cpan> quit
cd ~/.cpan/build/DBD-Oracle*
export LD_LIBRARY_PATH=/usr/lib/oracle/11.2/client64/lib
export ORACLE_HOME=/usr/lib/oracle/11.2/client64
perl Makefile.PL
make
make install
Installing DBD::Oracle require that the three Oracle packages:
instant-client, SDK and SQLplus are installed as well as the libaio1
library.
If you are using Instant Client from ZIP archives, the LD_LIBRARY_PATH
and ORACLE_HOME will be the same and must be set to the directory where
you have installed the files. For example:
/opt/oracle/instantclient_12_2/
CONFIGURATION
Ora2Pg configuration can be as simple as choosing the Oracle database to
export and choose the export type. This can be done in a minute.
By reading this documentation you will also be able to:
- Select only certain tables and/or column for export.
- Rename some tables and/or column during export.
- Select data to export following a WHERE clause per table.
- Delay database constraints during data loading.
- Compress exported data to save disk space.
- and much more.
The full control of the Oracle database migration is taken though a
single configuration file named ora2pg.conf. The format of this file
consist in a directive name in upper case followed by tab character and
a value. Comments are lines beginning with a #.
There's no specific order to place the configuration directives, they
are set at the time they are read in the configuration file.
For configuration directives that just take a single value, you can use
them multiple time in the configuration file but only the last
occurrence found in the file will be used. For configuration directives
that allow a list of value, you can use it multiple time, the values
will be appended to the list. If you use the IMPORT directive to load a
custom configuration file, directives defined in this file will be
stores from the place the IMPORT directive is found, so it is better to
put it at the end of the configuration file.
Values set in command line options will override values from the
configuration file.
Ora2Pg usage
First of all be sure that libraries and binaries path include the Oracle
Instant Client installation:
export LD_LIBRARY_PATH=/usr/lib/oracle/11.2/client64/lib
export PATH="/usr/lib/oracle/11.2/client64/bin:$PATH"
By default Ora2Pg will look for /etc/ora2pg/ora2pg.conf configuration
file, if the file exist you can simply execute:
/usr/local/bin/ora2pg
or under Windows(tm) run ora2pg.bat file, located in your perl bin
directory. Windows(tm) users may also find a template configuration file
in C:\ora2pg
If you want to call another configuration file, just give the path as
command line argument:
/usr/local/bin/ora2pg -c /etc/ora2pg/new_ora2pg.conf
Here are all command line parameters available when using ora2pg:
Usage: ora2pg [-dhpqv --estimate_cost --dump_as_html] [--option value]
-a | --allow str : Comma separated list of objects to allow from export.
Can be used with SHOW_COLUMN too.
-b | --basedir dir: Set the default output directory, where files
resulting from exports will be stored.
-c | --conf file : Set an alternate configuration file other than the
default /etc/ora2pg/ora2pg.conf.
-C | --cdc_file file: File used to store/read SCN per table during export.
default: TABLES_SCN.log in the current directory. This
is the file written by the --cdc_ready option.
-d | --debug : Enable verbose output.
-D | --data_type str : Allow custom type replacement at command line.
-e | --exclude str: Comma separated list of objects to exclude from export.
Can be used with SHOW_COLUMN too.
-h | --help : Print this short help.
-g | --grant_object type : Extract privilege from the given object type.
See possible values with GRANT_OBJECT configuration.
-i | --input file : File containing Oracle PL/SQL code to convert with
no Oracle database connection initiated.
-j | --jobs num : Number of parallel process to send data to PostgreSQL.
-J | --copies num : Number of parallel connections to extract data from Oracle.
-l | --log file : Set a log file. Default is stdout.
-L | --limit num : Number of tuples extracted from Oracle and stored in
memory before writing, default: 10000.
-m | --mysql : Export a MySQL database instead of an Oracle schema.
-M | --mssql : Export a Microsoft SQL Server database.
-n | --namespace schema : Set the Oracle schema to extract from.
-N | --pg_schema schema : Set PostgreSQL's search_path.
-o | --out file : Set the path to the output file where SQL will
be written. Default: output.sql in running directory.
-O | --options : Used to override any configuration parameter, it can
be used multiple time. Syntax: -O "PARAM_NAME=value"
-p | --plsql : Enable PLSQL to PLPGSQL code conversion.
-P | --parallel num: Number of parallel tables to extract at the same time.
-q | --quiet : Disable progress bar.
-r | --relative : use \ir instead of \i in the psql scripts generated.
-s | --source DSN : Allow to set the Oracle DBI datasource.
-S | --scn SCN : Allow to set the Oracle System Change Number (SCN) to
use to export data. It will be used in the WHERE clause
to get the data. It is used with action COPY or INSERT.
-t | --type export: Set the export type. It will override the one
given in the configuration file (TYPE).
-T | --temp_dir dir: Set a distinct temporary directory when two
or more ora2pg are run in parallel.
-u | --user name : Set the Oracle database connection user.
ORA2PG_USER environment variable can be used instead.
-v | --version : Show Ora2Pg Version and exit.
-w | --password pwd : Set the password of the Oracle database user.
ORA2PG_PASSWD environment variable can be used instead.
-W | --where clause : Set the WHERE clause to apply to the Oracle query to
retrieve data. Can be used multiple time.
--forceowner : Force ora2pg to set tables and sequences owner like in
Oracle database. If the value is set to a username this one
will be used as the objects owner. By default it's the user
used to connect to the Pg database that will be the owner.
--nls_lang code: Set the Oracle NLS_LANG client encoding.
--client_encoding code: Set the PostgreSQL client encoding.
--view_as_table str: Comma separated list of views to export as table.
--estimate_cost : Activate the migration cost evaluation with SHOW_REPORT
--cost_unit_value minutes: Number of minutes for a cost evaluation unit.
default: 5 minutes, corresponds to a migration conducted by a
PostgreSQL expert. Set it to 10 if this is your first migration.
--dump_as_html : Force ora2pg to dump report in HTML, used only with
SHOW_REPORT. Default is to dump report as simple text.
--dump_as_csv : As above but force ora2pg to dump report in CSV.
--dump_as_json : As above but force ora2pg to dump report in JSON.
--dump_as_sheet : Report migration assessment with one CSV line per database.
--init_project name: Initialise a typical ora2pg project tree. Top directory
will be created under project base dir.
--project_base dir : Define the base dir for ora2pg project trees. Default
is current directory.
--print_header : Used with --dump_as_sheet to print the CSV header
especially for the first run of ora2pg.
--human_days_limit num : Set the number of person-days limit where the migration
assessment level switch from B to C. Default is set to
5 person-days.
--audit_user list : Comma separated list of usernames to filter queries in
the DBA_AUDIT_TRAIL table. Used only with SHOW_REPORT
and QUERY export type.
--pg_dsn DSN : Set the datasource to PostgreSQL for direct import.
--pg_user name : Set the PostgreSQL user to use.
--pg_pwd password : Set the PostgreSQL password to use.
--count_rows : Force ora2pg to perform a real row count in TEST,
TEST_COUNT and SHOW_TABLE actions.
--no_header : Do not append Ora2Pg header to output file
--oracle_speed : Use to know at which speed Oracle is able to send
data. No data will be processed or written.
--ora2pg_speed : Use to know at which speed Ora2Pg is able to send
transformed data. Nothing will be written.
--blob_to_lo : export BLOB as large objects, can only be used with
action SHOW_COLUMN, TABLE and INSERT.
--cdc_ready : use current SCN per table to export data and register
them into a file named TABLES_SCN.log per default. It
can be changed using -C | --cdc_file.
--lo_import : use psql \lo_import command to import BLOB as large
object. Can be use to import data with COPY and import
large object manually in a second pass. It is recquired
for BLOB > 1GB. See documentation for more explanation.
--mview_as_table str: Comma separated list of materialized views to export
as regular table.
--drop_if_exists : Drop the object before creation if it exists.
--delete clause : Set the DELETE clause to apply to the Oracle query to
be applied before importing data. Can be used multiple
time.
--oracle_fdw_prefetch: Set the oracle_fdw prefetch value. Larger values
generally result in faster data transfer at the cost
of greater memory utilisation at the destination.
See full documentation at https://ora2pg.darold.net/ for more help or
see manpage with 'man ora2pg'.
ora2pg will return 0 on success, 1 on error. It will return 2 when a
child process has been interrupted and you've gotten the warning
message: "WARNING: an error occurs during data export. Please check
what's happen." Most of the time this is an OOM issue, first try
reducing DATA_LIMIT value.
For developers, it is possible to add your own custom option(s) in the
Perl script ora2pg as any configuration directive from ora2pg.conf can
be passed in lower case to the new Ora2Pg object instance. See ora2pg
code on how to add your own option.
Note that performance might be improved by updating stats on oracle:
BEGIN
DBMS_STATS.GATHER_SCHEMA_STATS
DBMS_STATS.GATHER_DATABASE_STATS
DBMS_STATS.GATHER_DICTIONARY_STATS
END;
Generate a migration template
The two options --project_base and --init_project when used indicate to
ora2pg that he has to create a project template with a work tree, a
configuration file and a script to export all objects from the Oracle
database. Here a sample of the command usage:
ora2pg --project_base /app/migration/ --init_project test_project
Creating project test_project.
/app/migration/test_project/
schema/
dblinks/
directories/
functions/
grants/
mviews/
packages/
partitions/
procedures/
sequences/
synonyms/
tables/
tablespaces/
triggers/
types/
views/
sources/
functions/
mviews/
packages/
partitions/
procedures/
triggers/
types/
views/
data/
config/
reports/
Generating generic configuration file
Creating script export_schema.sh to automate all exports.
Creating script import_all.sh to automate all imports.
It create a generic config file where you just have to define the Oracle
database connection and a shell script called export_schema.sh. The
sources/ directory will contains the Oracle code, the schema/ will
contains the code ported to PostgreSQL. The reports/ directory will
contains the html reports with the migration cost assessment.
If you want to use your own default config file, use the -c option to
give the path to that file. Rename it with .dist suffix if you want
ora2pg to apply the generic configuration values otherwise, the
configuration file will be copied untouched.
Once you have set the connection to the Oracle Database you can execute
the script export_schema.sh that will export all object type from your
Oracle database and output DDL files into the schema's subdirectories.
At end of the export it will give you the command to export data later
when the import of the schema will be done and verified.
You can choose to load the DDL files generated manually or use the
second script import_all.sh to import those file interactively. If this
kind of migration is not something current for you it's recommended you
to use those scripts.
Oracle database connection
There's 5 configuration directives to control the access to the Oracle
database.
ORACLE_HOME
Used to set ORACLE_HOME environment variable to the Oracle libraries
required by the DBD::Oracle Perl module.
ORACLE_DSN
This directive is used to set the data source name in the form
standard DBI DSN. For example:
dbi:Oracle:host=oradb_host.myhost.com;sid=DB_SID;port=1521
or
dbi:Oracle:DB_SID
On 18c this could be for example:
dbi:Oracle:host=192.168.1.29;service_name=pdb1;port=1521
for the second notation the SID should be declared in the well known
file $ORACLE_HOME/network/admin/tnsnames.ora or in the path given to
the TNS_ADMIN environment variable.
For MySQL the DSN will lool like this:
dbi:mysql:host=192.168.1.10;database=sakila;port=3306
the 'sid' part is replaced by 'database'.
For MS SQL Server it will look like this:
dbi:ODBC:driver=msodbcsql18;server=mydb.database.windows.net;database=testdb;TrustServerCertificate=yes
ORACLE_USER et ORACLE_PWD
These two directives are used to define the user and password for
the Oracle database connection. Note that if you can it is better to
login as Oracle super admin to avoid grants problem during the
database scan and be sure that nothing is missing.
If you do not supply a credential with ORACLE_PWD and you have
installed the Term::ReadKey Perl module, Ora2Pg will ask for the
password interactively. If ORACLE_USER is not set it will be asked
interactively too.
To connect to a local ORACLE instance with connections "as sysdba"
you have to set ORACLE_USER to "/" and an empty password.
To make a connection using an Oracle Secure External Password Store
(SEPS), first configure the Oracle Wallet and then set both the
ORACLE_USER and ORACLE_PWD directives to the special value of
"__SEPS__" (without the quotes but with the double underscore).
USER_GRANTS
Set this directive to 1 if you connect the Oracle database as simple
user and do not have enough grants to extract things from the
DBA_... tables. It will use tables ALL_... instead.
Warning: if you use export type GRANT, you must set this
configuration option to 0 or it will not work.
TRANSACTION
This directive may be used if you want to change the default
isolation level of the data export transaction. Default is now to
set the level to a serializable transaction to ensure data
consistency. The allowed values for this directive are:
readonly: 'SET TRANSACTION READ ONLY',
readwrite: 'SET TRANSACTION READ WRITE',
serializable: 'SET TRANSACTION ISOLATION LEVEL SERIALIZABLE'
committed: 'SET TRANSACTION ISOLATION LEVEL READ COMMITTED',
Releases before 6.2 used to set the isolation level to READ ONLY
transaction but in some case this was breaking data consistency so
now default is set to SERIALIZABLE.
INPUT_FILE
This directive did not control the Oracle database connection or
unless it purely disables the use of any Oracle database by
accepting a file as argument. Set this directive to a file
containing PL/SQL Oracle Code like function, procedure or full
package body to prevent Ora2Pg from connecting to an Oracle database
and just apply his conversion tool to the content of the file. This
can be used with the most of export types: TABLE, TRIGGER,
PROCEDURE, VIEW, FUNCTION or PACKAGE, etc.
ORA_INITIAL_COMMAND
This directive can be used to send an initial command to Oracle,
just after the connection. For example to unlock a policy before
reading objects or to set some session parameters. This directive
can be used multiple times.
Data encryption with Oracle server
If your Oracle Client config file already includes the encryption
method, then DBD:Oracle uses those settings to encrypt the connection
while you extract the data. For example if you have configured the
Oracle Client config file (sqlnet.ora or .sqlnet) with the following
information:
# Configure encryption of connections to Oracle
SQLNET.ENCRYPTION_CLIENT = required
SQLNET.ENCRYPTION_TYPES_CLIENT = (AES256, RC4_256)
SQLNET.CRYPTO_SEED = 'should be 10-70 random characters'
Any tool that uses the Oracle client to talk to the database will be
encrypted if you setup session encryption like above.
For example, Perl's DBI uses DBD-Oracle, which uses the Oracle client
for actually handling database communication. If the installation of
Oracle client used by Perl is setup to request encrypted connections,
then your Perl connection to an Oracle database will also be encrypted.
Full details at
https://kb.berkeley.edu/jivekb/entry.jspa?externalID=1005
Testing connection
Once you have set the Oracle database DSN you can execute ora2pg to see
if it works:
ora2pg -t SHOW_VERSION -c config/ora2pg.conf
will show the Oracle database server version. Take some time here to
test your installation as most problems take place here, the other
configuration steps are more technical.
Troubleshooting
If the output.sql file has not exported anything other than the Pg
transaction header and footer there's two possible reasons. The perl
script ora2pg dump an ORA-XXX error, that mean that your DSN or login
information are wrong, check the error and your settings and try again.
The perl script says nothing and the output file is empty: the user
lacks permission to extract something from the database. Try to connect
to Oracle as super user or take a look at directive USER_GRANTS above
and at next section, especially the SCHEMA directive.
LOGFILE
By default all messages are sent to the standard output. If you give
a file path to that directive, all output will be appended to this
file.
Oracle schema to export
The Oracle database export can be limited to a specific Schema or
Namespace, this can be mandatory following the database connection user.
SCHEMA
This directive is used to set the schema name to use during export.
For example:
SCHEMA APPS
will extract objects associated to the APPS schema.
When no schema name is provided and EXPORT_SCHEMA is enabled, Ora2Pg
will export all objects from all schema of the Oracle instance with
their names prefixed with the schema name.
EXPORT_SCHEMA
By default the Oracle schema is not exported into the PostgreSQL
database and all objects are created under the default Pg namespace.
If you want to also export this schema and create all objects under
this namespace, set the EXPORT_SCHEMA directive to 1. This will set
the schema search_path at top of export SQL file to the schema name
set in the SCHEMA directive with the default pg_catalog schema. If
you want to change this path, use the directive PG_SCHEMA.
CREATE_SCHEMA
Enable/disable the CREATE SCHEMA SQL order at starting of the output
file. It is enable by default and concern on TABLE export type.
COMPILE_SCHEMA
By default Ora2Pg will only export valid PL/SQL code. You can force
Oracle to compile again the invalidated code to get a chance to have
it obtain the valid status and then be able to export it.
Enable this directive to force Oracle to compile schema before
exporting code. When this directive is enabled and SCHEMA is set to
a specific schema name, only invalid objects in this schema will be
recompiled. If SCHEMA is not set then all schema will be recompiled.
To force recompile invalid object in a specific schema, set
COMPILE_SCHEMA to the schema name you want to recompile.
This will ask to Oracle to validate the PL/SQL that could have been
invalidate after a export/import for example. The 'VALID' or
'INVALID' status applies to functions, procedures, packages and user
defined types. It also concern disabled triggers.
EXPORT_INVALID
If the above configuration directive is not enough to validate your
PL/SQL code enable this configuration directive to allow export of
all PL/SQL code even if it is marked as invalid. The 'VALID' or
'INVALID' status applies to functions, procedures, packages,
triggers and user defined types.
PG_SCHEMA
Allow you to defined/force the PostgreSQL schema to use. By default
if you set EXPORT_SCHEMA to 1 the PostgreSQL search_path will be set
to the schema name exported set as value of the SCHEMA directive.
The value can be a comma delimited list of schema name but not when
using TABLE export type because in this case it will generate the
CREATE SCHEMA statement and it doesn't support multiple schema name.
For example, if you set PG_SCHEMA to something like "user_schema,
public", the search path will be set like this:
SET search_path = user_schema, public;
forcing the use of an other schema (here user_schema) than the one
from Oracle schema set in the SCHEMA directive.
You can also set the default search_path for the PostgreSQL user you
are using to connect to the destination database by using:
ALTER ROLE username SET search_path TO user_schema, public;
in this case you don't have to set PG_SCHEMA.
SYSUSERS
Without explicit schema, Ora2Pg will export all objects that not
belongs to system schema or role:
SYSTEM,CTXSYS,DBSNMP,EXFSYS,LBACSYS,MDSYS,MGMT_VIEW,
OLAPSYS,ORDDATA,OWBSYS,ORDPLUGINS,ORDSYS,OUTLN,
SI_INFORMTN_SCHEMA,SYS,SYSMAN,WK_TEST,WKSYS,WKPROXY,
WMSYS,XDB,APEX_PUBLIC_USER,DIP,FLOWS_020100,FLOWS_030000,
FLOWS_040100,FLOWS_010600,FLOWS_FILES,MDDATA,ORACLE_OCM,
SPATIAL_CSW_ADMIN_USR,SPATIAL_WFS_ADMIN_USR,XS$NULL,PERFSTAT,
SQLTXPLAIN,DMSYS,TSMSYS,WKSYS,APEX_040000,APEX_040200,
DVSYS,OJVMSYS,GSMADMIN_INTERNAL,APPQOSSYS,DVSYS,DVF,
AUDSYS,APEX_030200,MGMT_VIEW,ODM,ODM_MTR,TRACESRV,MTMSYS,
OWBSYS_AUDIT,WEBSYS,WK_PROXY,OSE$HTTP$ADMIN,
AURORA$JIS$UTILITY$,AURORA$ORB$UNAUTHENTICATED,
DBMS_PRIVILEGE_CAPTURE,CSMIG,MGDSYS,SDE,DBSFWUSER
Following your Oracle installation you may have several other system
role defined. To append these users to the schema exclusion list,
just set the SYSUSERS configuration directive to a comma-separated
list of system user to exclude. For example:
SYSUSERS INTERNAL,SYSDBA,BI,HR,IX,OE,PM,SH
will add users INTERNAL and SYSDBA to the schema exclusion list.
FORCE_OWNER
By default the owner of the database objects is the one you're using
to connect to PostgreSQL using the psql command. If you use an other
user (postgres for example) you can force Ora2Pg to set the object
owner to be the one used in the Oracle database by setting the
directive to 1, or to a completely different username by setting the
directive value to that username.
FORCE_SECURITY_INVOKER
Ora2Pg use the function's security privileges set in Oracle and it
is often defined as SECURITY DEFINER. If you want to override those
security privileges for all functions and use SECURITY DEFINER
instead, enable this directive.
USE_TABLESPACE
When enabled this directive force ora2pg to export all tables,
indexes constraint and indexes using the tablespace name defined in
Oracle database. This works only with tablespace that are not TEMP,
USERS and SYSTEM.
WITH_OID
Activating this directive will force Ora2Pg to add WITH (OIDS) when
creating tables or views as tables. Default is same as PostgreSQL,
disabled.
LOOK_FORWARD_FUNCTION
List of schema to get functions/procedures meta information that are
used in the current schema export. When replacing call to function
with OUT parameters, if a function is declared in an other package
then the function call rewriting can not be done because Ora2Pg only
knows about functions declared in the current schema. By setting a
comma separated list of schema as value of this directive, Ora2Pg
will look forward in these packages for all
functions/procedures/packages declaration before proceeding to
current schema export.
NO_FUNCTION_METADATA
Force Ora2Pg to not look for function declaration. Note that this
will prevent Ora2Pg to rewrite function replacement call if needed.
Do not enable it unless looking forward at function breaks other
export.
Export type
The export action is perform following a single configuration directive
'TYPE', some other add more control on what should be really exported.
TYPE
Here are the different values of the TYPE directive, default is
TABLE:
- TABLE: Extract all tables with indexes, primary keys, unique keys,
foreign keys and check constraints.
- VIEW: Extract only views.
- GRANT: Extract roles converted to Pg groups, users and grants on all
objects.
- SEQUENCE: Extract all sequence and their last position.
- TABLESPACE: Extract storage spaces for tables and indexes (Pg >= v8).
- TRIGGER: Extract triggers defined following actions.
- FUNCTION: Extract functions.
- PROCEDURE: Extract procedures.
- PACKAGE: Extract packages and package bodies.
- INSERT: Extract data as INSERT statement.
- COPY: Extract data as COPY statement.
- PARTITION: Extract range and list Oracle partitions with subpartitions.
- TYPE: Extract user defined Oracle type.
- FDW: Export Oracle tables as foreign table for Oracle, MySQL and SQL Server FDW.
- MVIEW: Export materialized view.
- QUERY: Try to automatically convert Oracle SQL queries.
- KETTLE: Generate XML ktr template files to be used by Kettle.
- DBLINK: Generate oracle foreign data wrapper server to use as dblink.
- SYNONYM: Export Oracle's synonyms as views on other schema's objects.
- DIRECTORY: Export Oracle's directories as external_file extension objects.
- LOAD: Dispatch a list of queries over multiple PostgreSQl connections.
- TEST: perform a diff between Oracle and PostgreSQL database.
- TEST_COUNT: perform a row count diff between Oracle and PostgreSQL table.
- TEST_VIEW: perform a count on both side of number of rows returned by views.
- TEST_DATA: perform data validation check on rows at both sides.
- SEQUENCE_VALUES: export DDL to set the last values of sequences
Only one type of export can be perform at the same time so the TYPE
directive must be unique. If you have more than one only the last
found in the file will be registered.
Some export type can not or should not be load directly into the
PostgreSQL database and still require little manual editing. This is
the case for GRANT, TABLESPACE, TRIGGER, FUNCTION, PROCEDURE, TYPE,
QUERY and PACKAGE export types especially if you have PLSQL code or
Oracle specific SQL in it.
For TABLESPACE you must ensure that file path exist on the system
and for SYNONYM you may ensure that the object's owners and schemas
correspond to the new PostgreSQL database design.
Note that you can chained multiple export by giving to the TYPE
directive a comma-separated list of export type, but in this case
you must not use COPY or INSERT with other export type.
Ora2Pg will convert Oracle partition using table inheritance,
trigger and functions. See document at Pg site:
http://www.postgresql.org/docs/current/interactive/ddl-partitioning.
html
The TYPE export allow export of user defined Oracle type. If you
don't use the --plsql command line parameter it simply dump Oracle
user type asis else Ora2Pg will try to convert it to PostgreSQL
syntax.
The KETTLE export type requires that the Oracle and PostgreSQL DNS
are defined.
Since Ora2Pg v8.1 there's three new export types:
SHOW_VERSION : display Oracle version
SHOW_SCHEMA : display the list of schema available in the database.
SHOW_TABLE : display the list of tables available.
SHOW_COLUMN : display the list of tables columns available and the
Ora2PG conversion type from Oracle to PostgreSQL that will be
applied. It will also warn you if there's PostgreSQL reserved
words in Oracle object names.
Here is an example of the SHOW_COLUMN output:
[2] TABLE CURRENT_SCHEMA (1 rows) (Warning: 'CURRENT_SCHEMA' is a reserved word in PostgreSQL)
CONSTRAINT : NUMBER(22) => bigint (Warning: 'CONSTRAINT' is a reserved word in PostgreSQL)
FREEZE : VARCHAR2(25) => varchar(25) (Warning: 'FREEZE' is a reserved word in PostgreSQL)
...
[6] TABLE LOCATIONS (23 rows)
LOCATION_ID : NUMBER(4) => smallint
STREET_ADDRESS : VARCHAR2(40) => varchar(40)
POSTAL_CODE : VARCHAR2(12) => varchar(12)
CITY : VARCHAR2(30) => varchar(30)
STATE_PROVINCE : VARCHAR2(25) => varchar(25)
COUNTRY_ID : CHAR(2) => char(2)
Those extraction keywords are use to only display the requested
information and exit. This allows you to quickly know on what you
are going to work.
The SHOW_COLUMN allow an other ora2pg command line option: '--allow
relname' or '-a relname' to limit the displayed information to the
given table.
The SHOW_ENCODING export type will display the NLS_LANG and
CLIENT_ENCODING values that Ora2Pg will used and the real encoding
of the Oracle database with the corresponding client encoding that
could be used with PostgreSQL
Ora2Pg allow you to export your Oracle, MySQL or MSSQL table
definition to be use with the oracle_fdw, mysql_fdw or tds_fdw
foreign data wrapper. By using type FDW your tables will be exported
as follow:
CREATE FOREIGN TABLE oratab (
id integer NOT NULL,
text character varying(30),
floating double precision NOT NULL
) SERVER oradb OPTIONS (table 'ORATAB');
Now you can use the table like a regular PostgreSQL table.
Release 10 adds a new export type destined to evaluate the content
of the database to migrate, in terms of objects and cost to end the
migration:
SHOW_REPORT : show a detailed report of the Oracle database content.
Here is a sample of report: http://ora2pg.darold.net/report.html
There also a more advanced report with migration cost. See the
dedicated chapter about Migration Cost Evaluation.
ESTIMATE_COST
Activate the migration cost evaluation. Must only be used with
SHOW_REPORT, FUNCTION, PROCEDURE, PACKAGE and QUERY export type.
Default is disabled. You may want to use the --estimate_cost command
line option instead to activate this functionality. Note that
enabling this directive will force PLSQL_PGSQL activation.
COST_UNIT_VALUE
Set the value in minutes of the migration cost evaluation unit.
Default is five minutes per unit. See --cost_unit_value to change
the unit value at command line.
DUMP_AS_HTML
By default when using SHOW_REPORT the migration report is generated
as simple text, enabling this directive will force ora2pg to create
a report in HTML format.
See http://ora2pg.darold.net/report.html for a sample report.
HUMAN_DAYS_LIMIT
Use this directive to redefined the number of person-days limit
where the migration assessment level must switch from B to C.
Default is set to 10 person-days.
JOBS
This configuration directive adds multiprocess support to COPY,
FUNCTION and PROCEDURE export type, the value is the number of
process to use. Default is multiprocess disable.
This directive is used to set the number of cores to used to
parallelize data import into PostgreSQL. During FUNCTION or
PROCEDURE export type each function will be translated to plpgsql
using a new process, the performances gain can be very important
when you have tons of function to convert.
There's no limitation in parallel processing than the number of
cores and the PostgreSQL I/O performance capabilities.
Doesn't work under Windows Operating System, it is simply disabled.
ORACLE_COPIES
This configuration directive adds multiprocess support to extract
data from Oracle. The value is the number of process to use to
parallelize the select query. Default is parallel query disable.
The parallelism is built on splitting the query following of the
number of cores given as value to ORACLE_COPIES as follow:
SELECT * FROM MYTABLE WHERE ABS(MOD(COLUMN, ORACLE_COPIES)) = CUR_PROC
where COLUMN is a technical key like a primary or unique key where
split will be based and the current core used by the query
(CUR_PROC). You can also force the column name to use using the
DEFINED_PK configuration directive.
Doesn't work under Windows Operating System, it is simply disabled.
DEFINED_PK
This directive is used to defined the technical key to used to split
the query between number of cores set with the ORACLE_COPIES
variable. For example:
DEFINED_PK EMPLOYEES:employee_id
The parallel query that will be used supposing that -J or
ORACLE_COPIES is set to 8:
SELECT * FROM EMPLOYEES WHERE ABS(MOD(employee_id, 8)) = N
where N is the current process forked starting from 0.
PARALLEL_TABLES
This directive is used to defined the number of tables that will be
processed in parallel for data extraction. The limit is the number
of cores on your machine. Ora2Pg will open one database connection
for each parallel table extraction. This directive, when upper than
1, will invalidate ORACLE_COPIES but not JOBS, so the real number of
process that will be used is PARALLEL_TABLES * JOBS.
Note that this directive when set upper that 1 will also
automatically enable the FILE_PER_TABLE directive if your are
exporting to files. This is used to export tables and views in