c8-source-oracle 0.0.2

Pipelinewise tap for reading from oracle databases. This includes support for PDBs.

c8-source-oracle

Singer tap that extracts data from a Oracle database and produces JSON-formatted data following the Singer spec.

How to use it

Run and configuration of this Singer Tap depends of the desired replication mode (INCREMENTAL or STREAMING)

Prerequisites : Create user on targeted PDB

Connect to CDB, then switch to targetted PDB

SQL> show con_name

CON_NAME
------------------------------
CDB$ROOT


SQL> alter session set container=wms17;

Session altered.

SQL> show con_name

CON_NAME
------------------------------
WMS17

Tap-Oracle user need to be created with the following rights on DB :

• CREATE_SESSION system privilege

grant CREATE SESSION to singer_user;

• SELECT right on V_$DATABASE

grant select on V_$DATABASE to singer_user;

You can also grant select on table to singer, table by table or via SELECT ANY TABLE privilege (up to you)

• SELECT ANY TABLE system privilege

grant SELECT ANY TABLE to singer_user;

Log based replication

Tap-Oracle Log-based replication requires some configuration changes in Oracle database:

• Enable ARCHIVELOG mode

• Set retention period a reasonable and long enough period, ie. 1 day, 3 days, etc.

• Enable Supplemental logging

Setting up Log-based replication on a self hosted Oracle Database:

To verify the current archiving mode, if the result is ARCHIVELOG, archiving is enabled:

  SQL> SELECT LOG_MODE FROM V$DATABASE

To enable ARCHIVELOG mode (if not enabled yet):

  SQL> SHUTDOWN IMMEDIATE
  SQL> STARTUP MOUNT
  SQL> ALTER DATABASE ARCHIVELOG
  SQL> ALTER DATABASE OPEN

To set retention period, use RMAN:

  RMAN> CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 1 DAYS;

To enable supplemental logging:

  SQL> ALTER DATABASE ADD SUPPLEMENTAL LOG DATA (ALL) COLUMNS

Install and Run

First, make sure Python 3 is installed on your system or follow these installation instructions for Mac or Ubuntu.

It's recommended to use a virtualenv:

  python3 -m venv venv
  pip install extended-tap-oracle

or

  python3 -m venv venv
  . venv/bin/activate
  pip install --upgrade pip
  pip install .

Configuration

Running the the tap requires a config.json file.

Example with the minimal settings:

  {
    "host": "foo.com",
    "port": 1521,
    "user": "my_user",
    "password": "password",
    "sid": "ORCL",
    "filter_schemas": "HR" # Lets get only the HR sample schema
  }

You can run a discover run using the previous config.json file to acquire all the tables definition

tap-oracle --config /tmp/config.json --discover >> /tmp/catalog.json

Then use the catalog.json to run a full export:

tap-oracle --config /tmp/config.json --catalog /tmp/catalog.json