diff --git a/CHANGELOG.md b/CHANGELOG.md
index f32a782..024eef1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Development
 
+## 0.4.1 (2021-05-27)
+
+* [#19](https://github.com/rheinwerk-verlag/postgresql-anonymizer/pull/19): Make chunk size in the table definition dynamic ([halilkaya](https://github.com/halilkaya))
+
 ## 0.4.0 (2021-05-05)
 
 * [#18](https://github.com/rheinwerk-verlag/postgresql-anonymizer/pull/18): Specify (SQL WHERE) search_condition, to filter the table for rows to be anonymized ([bobslee](https://github.com/bobslee))
diff --git a/README.rst b/README.rst
index 6954bb8..d356290 100644
--- a/README.rst
+++ b/README.rst
@@ -146,7 +146,7 @@ After that you can pass a schema file to the container, using Docker volumes, an
 .. _schema documentation: https://python-postgresql-anonymizer.readthedocs.io/en/latest/schema.html
 .. _YAML sample schema: https://github.com/rheinwerk-verlag/postgresql-anonymizer/blob/master/sample_schema.yml
 
-.. |python| image:: https://img.shields.io/pypi/pyversions/pganonymize 
+.. |python| image:: https://img.shields.io/pypi/pyversions/pganonymize
     :alt: PyPI - Python Version
 
 .. |license| image:: https://img.shields.io/badge/license-MIT-green.svg
@@ -158,6 +158,6 @@ After that you can pass a schema file to the container, using Docker volumes, an
 .. |downloads| image:: https://static.pepy.tech/personalized-badge/pganonymize?period=total&units=international_system&left_color=blue&right_color=black&left_text=Downloads
     :target: https://pepy.tech/project/pganonymize
     :alt: Download count
-    
+
 .. |build| image:: https://github.com/rheinwerk-verlag/postgresql-anonymizer/workflows/Test/badge.svg
     :target: https://github.com/rheinwerk-verlag/postgresql-anonymizer/actions
diff --git a/docs/schema.rst b/docs/schema.rst
index 689244b..732348c 100644
--- a/docs/schema.rst
+++ b/docs/schema.rst
@@ -3,14 +3,56 @@ Schema
 
 ``pganonymize`` uses a YAML based schema definition for the anonymization rules.
 
+Top level
+---------
+
 ``tables``
 ~~~~~~~~~~
 
 On the top level a list of tables can be defined with the ``tables`` keyword. This will define
 which tables should be anonymized.
 
-On the table level you can specify the tables primary key with the keyword ``primary_key`` if it
-isn't the default ``id``.
+**Example**::
+
+    tables:
+     - table_a:
+        fields:
+         - field_a: ...
+         - field_b: ...
+     - table_b:
+        fields:
+         - field_a: ...
+         - field_b: ...
+
+``truncate``
+~~~~~~~~~~~~
+
+You can also specify a list of tables that should be cleared instead of anonymized with the  `truncated` key. This is
+useful if you don't need the table data for development purposes or the reduce the size of the database dump.
+
+**Example**::
+
+    truncate:
+     - django_session
+     - my_other_table
+
+If two tables have a foreign key relation and you don't need to keep one of the table's data, just add the
+second table and they will be truncated at once, without causing a constraint error.
+
+Table level
+-----------
+
+``primary_key``
+~~~~~~~~~~~~~~~
+
+Defines the name of the primary key field for the current table. The default is ``id``.
+
+**Example**::
+
+    tables:
+     - my_table:
+        primary_key: my_primary_key
+        fields: ...
 
 ``fields``
 ~~~~~~~~~~
@@ -23,7 +65,6 @@ be treated.
 
     tables:
      - auth_user:
-        primary_key: id
         fields:
          - first_name:
             provider:
@@ -39,7 +80,7 @@ be treated.
 ~~~~~~~~~~~~
 
 For each table you can also specify a list of ``excludes``. Each entry has to be a field name which contains
-a list of exclude patterns. If one of these patterns matches, the whole table row won't ne anonymized.
+a list of exclude patterns. If one of these patterns matches, the whole table row won't be anonymized.
 
 **Example**::
 
@@ -57,22 +98,6 @@ a list of exclude patterns. If one of these patterns matches, the whole table ro
 This will exclude all data from the table ``auth_user`` that have an ``email`` field which matches the
 regular expression pattern (the backslash is to escape the string for YAML).
 
-``truncate``
-~~~~~~~~~~~~
-
-In addition to the field level providers you can also specify a list of tables that should be cleared with
-the  `truncated` key. This is useful if you don't need the table data for development purposes or the reduce
-the size of the database dump.
-
-**Example**::
-
-    truncate:
-     - django_session
-     - my_other_table
-
-If two tables have a foreign key relation and you don't need to keep one of the table's data, just add the
-second table and they will be truncated at once, without causing a constraint error.
-
 ``search``
 ~~~~~~~~~~
 
@@ -89,11 +114,59 @@ This is useful if you need to anonymize one or more specific records, eg for "Ri
             provider:
               name: clear
 
-Providers
----------
+``chunk_size``
+~~~~~~~~~~~~~~
+
+Defines how many data rows should be fetched for each iteration of anonymizing the current table. The default is 2000.
+
+**Example**::
+
+    tables:
+     - auth_user:
+        chunk_size: 5000
+        fields: ...
+
+Field level
+-----------
+
+``provider``
+~~~~~~~~~~~~
+
+Providers are the tools, which means functions, used to alter the data within the database. You can specify on field
+level which provider should be used to alter the specific field. The reference a provider you will have can use the
+``name`` attribute.
+
+**Example**::
+
+    tables:
+     - auth_user:
+        fields:
+         - first_name:
+            provider:
+              name: set
+              value: "Foo"
 
-Providers are the tools, which means functions, used to alter the data within the database.
-The following provider are currently supported:
+
+For a complete list of providers see the next section.
+
+``append``
+~~~~~~~~~~
+
+This argument will append a value at the end of the altered value:
+
+**Example usage**::
+
+    tables:
+     - auth_user:
+        fields:
+         - email:
+            provider:
+              name: md5
+            append: "@example.com"
+
+
+Provider
+--------
 
 ``choice``
 ~~~~~~~~~~
@@ -225,23 +298,3 @@ The value can also be a dictionary for JSONB columns::
             provider:
               name: set
               value: '{"foo": "bar", "baz": 1}'
-
-Arguments
----------
-
-In addition to the providers there is also a list of arguments that can be added to each provider:
-
-``append``
-~~~~~~~~~~
-
-This argument will append a value at the end of the altered value:
-
-**Example usage**::
-
-    tables:
-     - auth_user:
-        fields:
-         - email:
-            provider:
-              name: md5
-            append: "@example.com"
diff --git a/pganonymizer/constants.py b/pganonymizer/constants.py
index 0d6fbc1..0eb14d8 100644
--- a/pganonymizer/constants.py
+++ b/pganonymizer/constants.py
@@ -9,3 +9,6 @@
 
 # Filename of the default schema
 DEFAULT_SCHEMA_FILE = 'schema.yml'
+
+# Default chunk size for data fetch
+DEFAULT_CHUNK_SIZE = 2000
diff --git a/pganonymizer/utils.py b/pganonymizer/utils.py
index 671d2f0..5a90275 100644
--- a/pganonymizer/utils.py
+++ b/pganonymizer/utils.py
@@ -14,7 +14,7 @@
 from psycopg2.errors import BadCopyFileFormat, InvalidTextRepresentation
 from six import StringIO
 
-from pganonymizer.constants import COPY_DB_DELIMITER, DEFAULT_PRIMARY_KEY
+from pganonymizer.constants import COPY_DB_DELIMITER, DEFAULT_CHUNK_SIZE, DEFAULT_PRIMARY_KEY
 from pganonymizer.exceptions import BadDataFormat
 from pganonymizer.providers import get_provider
 
@@ -37,11 +37,13 @@ def anonymize_tables(connection, definitions, verbose=False):
         column_dict = get_column_dict(columns)
         primary_key = table_definition.get('primary_key', DEFAULT_PRIMARY_KEY)
         total_count = get_table_count(connection, table_name)
-        data, table_columns = build_data(connection, table_name, columns, excludes, search, total_count, verbose)
+        chunk_size = table_definition.get('chunk_size', DEFAULT_CHUNK_SIZE)
+        data, table_columns = build_data(connection, table_name, columns, excludes, search, total_count, chunk_size,
+                                         verbose)
         import_data(connection, column_dict, table_name, table_columns, primary_key, data)
 
 
-def build_data(connection, table, columns, excludes, search, total_count, verbose=False):
+def build_data(connection, table, columns, excludes, search, total_count, chunk_size, verbose=False):
     """
     Select all data from a table and return it together with a list of table columns.
 
@@ -51,6 +53,7 @@ def build_data(connection, table, columns, excludes, search, total_count, verbos
     :param list[dict] excludes: A list of exclude definitions.
     :param str search: A SQL WHERE (search_condition) to filter and keep only the searched rows.
     :param int total_count: The amount of rows for the current table
+    :param int chunk_size: Number of data rows to fetch with the cursor
     :param bool verbose: Display logging information and a progress bar.
     :return: A tuple containing the data list and a complete list of all table columns.
     :rtype: (list, list)
@@ -67,7 +70,7 @@ def build_data(connection, table, columns, excludes, search, total_count, verbos
     data = []
     table_columns = None
     while True:
-        records = cursor.fetchmany(size=2000)
+        records = cursor.fetchmany(size=chunk_size)
         if not records:
             break
         for row in records:
diff --git a/pganonymizer/version.py b/pganonymizer/version.py
index d19983d..ffca15b 100644
--- a/pganonymizer/version.py
+++ b/pganonymizer/version.py
@@ -1,3 +1,3 @@
 # -*- coding: utf-8 -*-
 
-__version__ = '0.4.0'
+__version__ = '0.4.1'
diff --git a/poetry.lock b/poetry.lock
index 8f49b24..8fa9116 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -39,14 +39,14 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [package.extras]
-dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "furo", "sphinx", "pre-commit"]
 docs = ["furo", "sphinx", "zope.interface"]
 tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
 tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six"]
+dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "furo", "sphinx", "pre-commit"]
 
 [[package]]
 name = "babel"
-version = "2.9.0"
+version = "2.9.1"
 description = "Internationalization utilities"
 category = "dev"
 optional = true
@@ -65,15 +65,15 @@ python-versions = "*"
 
 [[package]]
 name = "backports.functools-lru-cache"
-version = "1.6.1"
+version = "1.6.4"
 description = "Backport of functools.lru_cache"
 category = "dev"
 optional = false
 python-versions = ">=2.6"
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=3.5,<3.7.3 || >3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pytest-black-multipy", "pytest-cov"]
+docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
+testing = ["pytest (>=4.6)", "pytest-black (>=0.3.7)", "pytest-mypy", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "pytest-checkdocs (>=2.4)"]
 
 [[package]]
 name = "backports.shutil-get-terminal-size"
@@ -85,7 +85,7 @@ python-versions = "*"
 
 [[package]]
 name = "certifi"
-version = "2020.11.8"
+version = "2020.12.5"
 description = "Python package for providing Mozilla's CA Bundle."
 category = "dev"
 optional = true
@@ -93,11 +93,11 @@ python-versions = "*"
 
 [[package]]
 name = "chardet"
-version = "3.0.4"
+version = "4.0.0"
 description = "Universal encoding detector for Python 2 and 3"
 category = "dev"
 optional = true
-python-versions = "*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
 name = "colorama"
@@ -119,7 +119,7 @@ python-versions = "*"
 future = {version = ">=0.14.0", markers = "python_version < \"3\""}
 
 [package.extras]
-test = ["flake8 (3.7.8)", "hypothesis (3.55.3)"]
+test = ["flake8 (==3.7.8)", "hypothesis (==3.55.3)"]
 
 [[package]]
 name = "configparser"
@@ -131,7 +131,7 @@ python-versions = ">=2.6"
 
 [package.extras]
 docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=3.5,<3.7.3 || >3.7.3)", "pytest-checkdocs (>=1.2)", "pytest-flake8", "pytest-black-multipy"]
+testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2)", "pytest-flake8", "pytest-black-multipy"]
 
 [[package]]
 name = "contextlib2"
@@ -143,7 +143,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "coverage"
-version = "5.3"
+version = "5.5"
 description = "Code coverage measurement for Python"
 category = "dev"
 optional = false
@@ -160,9 +160,17 @@ category = "dev"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*"
 
+[[package]]
+name = "decorator"
+version = "5.0.7"
+description = "Decorators for Humans"
+category = "dev"
+optional = false
+python-versions = ">=3.5"
+
 [[package]]
 name = "docutils"
-version = "0.16"
+version = "0.17.1"
 description = "Docutils -- Python Documentation Utilities"
 category = "dev"
 optional = true
@@ -178,11 +186,11 @@ python-versions = "*"
 
 [[package]]
 name = "execnet"
-version = "1.7.1"
+version = "1.8.0"
 description = "execnet: rapid multi-Python deployment"
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.dependencies]
 apipkg = ">=1.4"
@@ -199,28 +207,28 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.dependencies]
-ipaddress = {version = "*", markers = "python_version < \"3.3\""}
 python-dateutil = ">=2.4"
-six = ">=1.10"
 text-unidecode = "1.3"
+six = ">=1.10"
+ipaddress = {version = "*", markers = "python_version < \"3.3\""}
 
 [[package]]
 name = "flake8"
-version = "3.8.4"
+version = "3.9.1"
 description = "the modular source code checker: pep8 pyflakes and co"
 category = "dev"
 optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
 
 [package.dependencies]
-configparser = {version = "*", markers = "python_version < \"3.2\""}
+pyflakes = ">=2.3.0,<2.4.0"
 enum34 = {version = "*", markers = "python_version < \"3.4\""}
-functools32 = {version = "*", markers = "python_version < \"3.2\""}
+typing = {version = "*", markers = "python_version < \"3.5\""}
 importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 mccabe = ">=0.6.0,<0.7.0"
-pycodestyle = ">=2.6.0a1,<2.7.0"
-pyflakes = ">=2.2.0,<2.3.0"
-typing = {version = "*", markers = "python_version < \"3.5\""}
+pycodestyle = ">=2.7.0,<2.8.0"
+functools32 = {version = "*", markers = "python_version < \"3.2\""}
+configparser = {version = "*", markers = "python_version < \"3.2\""}
 
 [[package]]
 name = "funcsigs"
@@ -279,10 +287,10 @@ optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
 
 [package.dependencies]
-configparser = {version = ">=3.5", markers = "python_version < \"3\""}
 contextlib2 = {version = "*", markers = "python_version < \"3\""}
 pathlib2 = {version = "*", markers = "python_version < \"3\""}
 zipp = ">=0.5"
+configparser = {version = ">=3.5", markers = "python_version < \"3\""}
 
 [package.extras]
 docs = ["sphinx", "rst.linker"]
@@ -320,28 +328,28 @@ python-versions = "*"
 
 [package.dependencies]
 appnope = {version = "*", markers = "sys_platform == \"darwin\""}
+win-unicode-console = {version = ">=0.5", markers = "sys_platform == \"win32\" and python_version < \"3.6\""}
+pathlib2 = {version = "*", markers = "python_version == \"2.7\" or python_version == \"3.3\""}
 "backports.shutil-get-terminal-size" = {version = "*", markers = "python_version == \"2.7\""}
+traitlets = ">=4.2"
+simplegeneric = ">0.8"
+pygments = "<2.6"
 colorama = {version = "*", markers = "sys_platform == \"win32\""}
-decorator = "*"
-pathlib2 = {version = "*", markers = "python_version == \"2.7\" or python_version == \"3.3\""}
+prompt-toolkit = ">=1.0.4,<2.0.0"
 pexpect = {version = "*", markers = "sys_platform != \"win32\""}
 pickleshare = "*"
-prompt-toolkit = ">=1.0.4,<2.0.0"
-pygments = "<2.6"
-simplegeneric = ">0.8"
-traitlets = ">=4.2"
-win-unicode-console = {version = ">=0.5", markers = "sys_platform == \"win32\" and python_version < \"3.6\""}
+decorator = "*"
 
 [package.extras]
+nbformat = ["nbformat"]
 all = ["nbformat", "ipykernel", "pygments (<2.6)", "testpath", "notebook", "nbconvert", "ipyparallel", "qtconsole", "Sphinx (>=1.3)", "requests", "nose (>=0.10.1)", "ipywidgets"]
-doc = ["Sphinx (>=1.3)"]
 kernel = ["ipykernel"]
-nbconvert = ["nbconvert"]
-nbformat = ["nbformat"]
+doc = ["Sphinx (>=1.3)"]
 notebook = ["notebook", "ipywidgets"]
-parallel = ["ipyparallel"]
+nbconvert = ["nbconvert"]
 qtconsole = ["qtconsole"]
 test = ["nose (>=0.10.1)", "requests", "testpath", "pygments (<2.6)", "nbformat", "ipykernel", "mock", "numpy"]
+parallel = ["ipyparallel"]
 
 [[package]]
 name = "ipython"
@@ -352,28 +360,28 @@ optional = false
 python-versions = ">=3.5"
 
 [package.dependencies]
-appnope = {version = "*", markers = "sys_platform == \"darwin\""}
 backcall = "*"
-colorama = {version = "*", markers = "sys_platform == \"win32\""}
-decorator = "*"
-jedi = ">=0.10"
+appnope = {version = "*", markers = "sys_platform == \"darwin\""}
+win-unicode-console = {version = ">=0.5", markers = "sys_platform == \"win32\" and python_version < \"3.6\""}
 pexpect = {version = "*", markers = "sys_platform != \"win32\""}
-pickleshare = "*"
-prompt-toolkit = ">=2.0.0,<2.1.0"
-pygments = "*"
 traitlets = ">=4.2"
-win-unicode-console = {version = ">=0.5", markers = "sys_platform == \"win32\" and python_version < \"3.6\""}
+jedi = ">=0.10"
+pygments = "*"
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+prompt-toolkit = ">=2.0.0,<2.1.0"
+pickleshare = "*"
+decorator = "*"
 
 [package.extras]
+nbformat = ["nbformat"]
 all = ["testpath", "nbformat", "numpy", "notebook", "ipyparallel", "nbconvert", "ipywidgets", "pygments", "requests", "nose (>=0.10.1)", "qtconsole", "ipykernel", "Sphinx (>=1.3)"]
-doc = ["Sphinx (>=1.3)"]
 kernel = ["ipykernel"]
-nbconvert = ["nbconvert"]
-nbformat = ["nbformat"]
+doc = ["Sphinx (>=1.3)"]
 notebook = ["notebook", "ipywidgets"]
-parallel = ["ipyparallel"]
+nbconvert = ["nbconvert"]
 qtconsole = ["qtconsole"]
 test = ["nose (>=0.10.1)", "requests", "testpath", "pygments", "nbformat", "ipykernel", "numpy"]
+parallel = ["ipyparallel"]
 
 [[package]]
 name = "ipython-genutils"
@@ -396,8 +404,8 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 futures = {version = "*", markers = "python_version < \"3.2\""}
 
 [package.extras]
-pipfile = ["pipreqs", "requirementslib"]
 pyproject = ["toml"]
+pipfile = ["pipreqs", "requirementslib"]
 requirements = ["pipreqs", "pip-api"]
 xdg_home = ["appdirs (>=1.4.0)"]
 
@@ -413,12 +421,12 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 parso = ">=0.7.0,<0.8.0"
 
 [package.extras]
-qa = ["flake8 (3.7.9)"]
+qa = ["flake8 (==3.7.9)"]
 testing = ["Django (<3.1)", "colorama", "docopt", "pytest (>=3.9.0,<5.0.0)"]
 
 [[package]]
 name = "jinja2"
-version = "2.11.2"
+version = "2.11.3"
 description = "A very fast and expressive template engine."
 category = "dev"
 optional = true
@@ -455,13 +463,13 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [package.dependencies]
-funcsigs = {version = ">=1", markers = "python_version < \"3.3\""}
 six = "*"
+funcsigs = {version = ">=1", markers = "python_version < \"3.3\""}
 
 [package.extras]
-build = ["twine", "wheel", "blurb"]
-docs = ["sphinx"]
 test = ["pytest", "pytest-cov"]
+docs = ["sphinx"]
+build = ["twine", "wheel", "blurb"]
 
 [[package]]
 name = "more-itertools"
@@ -476,7 +484,7 @@ six = ">=1.0.0,<2.0.0"
 
 [[package]]
 name = "more-itertools"
-version = "8.6.0"
+version = "8.7.0"
 description = "More routines for operating on iterables, beyond itertools"
 category = "dev"
 optional = false
@@ -484,7 +492,7 @@ python-versions = ">=3.5"
 
 [[package]]
 name = "packaging"
-version = "20.7"
+version = "20.9"
 description = "Core utilities for Python packages"
 category = "dev"
 optional = false
@@ -513,8 +521,8 @@ optional = false
 python-versions = "*"
 
 [package.dependencies]
-scandir = {version = "*", markers = "python_version < \"3.5\""}
 six = "*"
+scandir = {version = "*", markers = "python_version < \"3.5\""}
 
 [[package]]
 name = "pep8"
@@ -602,7 +610,7 @@ python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
 
 [[package]]
 name = "ptyprocess"
-version = "0.6.0"
+version = "0.7.0"
 description = "Run a subprocess in a pseudo terminal"
 category = "dev"
 optional = false
@@ -610,7 +618,7 @@ python-versions = "*"
 
 [[package]]
 name = "py"
-version = "1.9.0"
+version = "1.10.0"
 description = "library with cross-python path, ini-parsing, io, code, log facilities"
 category = "dev"
 optional = false
@@ -618,7 +626,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "pycodestyle"
-version = "2.6.0"
+version = "2.7.0"
 description = "Python style guide checker"
 category = "dev"
 optional = false
@@ -626,7 +634,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "pyflakes"
-version = "2.2.0"
+version = "2.3.1"
 description = "passive checker of Python programs"
 category = "dev"
 optional = false
@@ -657,21 +665,21 @@ optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
 
 [package.dependencies]
-atomicwrites = ">=1.0"
-attrs = ">=17.4.0"
-colorama = {version = "*", markers = "sys_platform == \"win32\" and python_version != \"3.4\""}
-funcsigs = {version = ">=1.0", markers = "python_version < \"3.0\""}
-importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 more-itertools = [
     {version = ">=4.0.0,<6.0.0", markers = "python_version <= \"2.7\""},
     {version = ">=4.0.0", markers = "python_version > \"2.7\""},
 ]
+six = ">=1.10.0"
+funcsigs = {version = ">=1.0", markers = "python_version < \"3.0\""}
+py = ">=1.5.0"
+wcwidth = "*"
 packaging = "*"
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
+colorama = {version = "*", markers = "sys_platform == \"win32\" and python_version != \"3.4\""}
+attrs = ">=17.4.0"
 pathlib2 = {version = ">=2.2.0", markers = "python_version < \"3.6\""}
 pluggy = ">=0.12,<1.0"
-py = ">=1.5.0"
-six = ">=1.10.0"
-wcwidth = "*"
+atomicwrites = ">=1.0"
 
 [package.extras]
 testing = ["argcomplete", "hypothesis (>=3.56)", "nose", "requests", "mock"]
@@ -690,18 +698,18 @@ pytest = ">=2.2"
 
 [[package]]
 name = "pytest-cov"
-version = "2.10.1"
+version = "2.11.1"
 description = "Pytest plugin for measuring coverage."
 category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.dependencies]
-coverage = ">=4.4"
 pytest = ">=4.6"
+coverage = ">=5.2.1"
 
 [package.extras]
-testing = ["fields", "hunter", "process-tests (2.0.2)", "six", "pytest-xdist", "virtualenv"]
+testing = ["fields", "hunter", "process-tests (==2.0.2)", "six", "pytest-xdist", "virtualenv"]
 
 [[package]]
 name = "pytest-pep8"
@@ -712,9 +720,9 @@ optional = false
 python-versions = "*"
 
 [package.dependencies]
+pytest-cache = "*"
 pep8 = ">=1.3"
 pytest = ">=2.4.2"
-pytest-cache = "*"
 
 [[package]]
 name = "pytest-pythonpath"
@@ -740,7 +748,7 @@ six = ">=1.5"
 
 [[package]]
 name = "pytz"
-version = "2020.4"
+version = "2021.1"
 description = "World timezone definitions, modern and historical"
 category = "dev"
 optional = true
@@ -763,27 +771,27 @@ optional = true
 python-versions = "*"
 
 [package.dependencies]
-commonmark = ">=0.8.1"
 docutils = ">=0.11"
 sphinx = ">=1.3.1"
+commonmark = ">=0.8.1"
 
 [[package]]
 name = "requests"
-version = "2.25.0"
+version = "2.25.1"
 description = "Python HTTP for Humans."
 category = "dev"
 optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.dependencies]
-certifi = ">=2017.4.17"
-chardet = ">=3.0.2,<4"
 idna = ">=2.5,<3"
+certifi = ">=2017.4.17"
+chardet = ">=3.0.2,<5"
 urllib3 = ">=1.21.1,<1.27"
 
 [package.extras]
 security = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)"]
-socks = ["PySocks (>=1.5.6,<1.5.7 || >1.5.7)", "win-inet-pton"]
+socks = ["PySocks (>=1.5.6,!=1.5.7)", "win-inet-pton"]
 
 [[package]]
 name = "scandir"
@@ -811,8 +819,8 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
 name = "snowballstemmer"
-version = "2.0.0"
-description = "This package provides 26 stemmers for 25 languages generated from Snowball algorithms."
+version = "2.1.0"
+description = "This package provides 29 stemmers for 28 languages generated from Snowball algorithms."
 category = "dev"
 optional = true
 python-versions = "*"
@@ -826,19 +834,19 @@ optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [package.dependencies]
-alabaster = ">=0.7,<0.8"
-babel = ">=1.3,<2.0 || >2.0"
-colorama = {version = ">=0.3.5", markers = "sys_platform == \"win32\""}
-docutils = ">=0.11"
 imagesize = "*"
-Jinja2 = ">=2.3"
+snowballstemmer = ">=1.1"
+babel = ">=1.3,<2.0 || >2.0"
+alabaster = ">=0.7,<0.8"
+six = ">=1.5"
 packaging = "*"
+docutils = ">=0.11"
 Pygments = ">=2.0"
-requests = ">=2.0.0"
-six = ">=1.5"
-snowballstemmer = ">=1.1"
+Jinja2 = ">=2.3"
 sphinxcontrib-websupport = "*"
 typing = {version = "*", markers = "python_version < \"3.5\""}
+colorama = {version = ">=0.3.5", markers = "sys_platform == \"win32\""}
+requests = ">=2.0.0"
 
 [package.extras]
 test = ["mock", "pytest", "pytest-cov", "html5lib", "flake8 (>=3.5.0)", "flake8-import-order", "enum34", "mypy", "typed-ast"]
@@ -883,34 +891,34 @@ optional = false
 python-versions = "*"
 
 [package.dependencies]
-decorator = "*"
 enum34 = {version = "*", markers = "python_version == \"2.7\""}
-ipython-genutils = "*"
 six = "*"
+ipython-genutils = "*"
+decorator = "*"
 
 [package.extras]
 test = ["pytest", "mock"]
 
 [[package]]
 name = "typing"
-version = "3.7.4.3"
+version = "3.10.0.0"
 description = "Type Hints for Python"
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, <3.5"
 
 [[package]]
 name = "urllib3"
-version = "1.26.2"
+version = "1.26.4"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
 category = "dev"
 optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
 
 [package.extras]
-brotli = ["brotlipy (>=0.6.0)"]
+socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 secure = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "certifi", "ipaddress"]
-socks = ["PySocks (>=1.5.6,<1.5.7 || >1.5.7,<2.0)"]
+brotli = ["brotlipy (>=0.6.0)"]
 
 [[package]]
 name = "wcwidth"
@@ -946,10 +954,13 @@ contextlib2 = {version = "*", markers = "python_version < \"3.4\""}
 docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
 testing = ["pathlib2", "unittest2", "jaraco.itertools", "func-timeout"]
 
+[extras]
+sphinx = []
+
 [metadata]
 lock-version = "1.1"
 python-versions = "~2.7 || ^3.5"
-content-hash = "9c666c6dd82943018963a04d95106c1d424434a14c9217e43f2fe0df37df1d12"
+content-hash = "64a38e16c92153dbcb558ebc25bbd105fae7432541e9233eb6026c4b6736b12d"
 
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 alabaster = [
@@ -973,28 +984,28 @@ attrs = [
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 pytest-pep8 = [
     {file = "pytest-pep8-1.0.6.tar.gz", hash = "sha256:032ef7e5fa3ac30f4458c73e05bb67b0f036a8a5cb418a534b3170f89f120318"},
@@ -1297,8 +1328,8 @@ python-dateutil = [
     {file = "python_dateutil-2.8.1-py2.py3-none-any.whl", hash = "sha256:75bb3f31ea686f1197762692a9ee6a7550b59fc6ca3a1f4b5d7e32fb98e2da2a"},
 ]
 pytz = [
-    {file = "pytz-2020.4-py2.py3-none-any.whl", hash = "sha256:5c55e189b682d420be27c6995ba6edce0c0a77dd67bfbe2ae6607134d5851ffd"},
-    {file = "pytz-2020.4.tar.gz", hash = "sha256:3e6b7dd2d1e0a59084bcee14a17af60c5c562cdc16d828e8eba2e683d3a7e268"},
+    {file = "pytz-2021.1-py2.py3-none-any.whl", hash = "sha256:eb10ce3e7736052ed3623d49975ce333bcd712c7bb19a58b9e2089d4057d0798"},
+    {file = "pytz-2021.1.tar.gz", hash = "sha256:83a4a90894bf38e243cf052c8b58f381bfe9a7a483f6a9cab140bc7f702ac4da"},
 ]
 pyyaml = [
     {file = "PyYAML-5.3.1-cp27-cp27m-win32.whl", hash = "sha256:74809a57b329d6cc0fdccee6318f44b9b8649961fa73144a98735b0aaf029f1f"},
@@ -1318,8 +1349,8 @@ recommonmark = [
     {file = "recommonmark-0.6.0.tar.gz", hash = "sha256:29cd4faeb6c5268c633634f2d69aef9431e0f4d347f90659fd0aab20e541efeb"},
 ]
 requests = [
-    {file = "requests-2.25.0-py2.py3-none-any.whl", hash = "sha256:e786fa28d8c9154e6a4de5d46a1d921b8749f8b74e28bde23768e5e16eece998"},
-    {file = "requests-2.25.0.tar.gz", hash = "sha256:7f1a0b932f4a60a1a65caa4263921bb7d9ee911957e0ae4a23a6dd08185ad5f8"},
+    {file = "requests-2.25.1-py2.py3-none-any.whl", hash = "sha256:c210084e36a42ae6b9219e00e48287def368a26d03a048ddad7bfee44f75871e"},
+    {file = "requests-2.25.1.tar.gz", hash = "sha256:27973dd4a904a4f13b263a19c866c13b92a39ed1c964655f025f3f8d3d75b804"},
 ]
 scandir = [
     {file = "scandir-1.10.0-cp27-cp27m-win32.whl", hash = "sha256:92c85ac42f41ffdc35b6da57ed991575bdbe69db895507af88b9f499b701c188"},
@@ -1342,8 +1373,8 @@ six = [
     {file = "six-1.15.0.tar.gz", hash = "sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259"},
 ]
 snowballstemmer = [
-    {file = "snowballstemmer-2.0.0-py2.py3-none-any.whl", hash = "sha256:209f257d7533fdb3cb73bdbd24f436239ca3b2fa67d56f6ff88e86be08cc5ef0"},
-    {file = "snowballstemmer-2.0.0.tar.gz", hash = "sha256:df3bac3df4c2c01363f3dd2cfa78cce2840a79b9f1c2d2de9ce8d31683992f52"},
+    {file = "snowballstemmer-2.1.0-py2.py3-none-any.whl", hash = "sha256:b51b447bea85f9968c13b650126a888aabd4cb4463fca868ec596826325dedc2"},
+    {file = "snowballstemmer-2.1.0.tar.gz", hash = "sha256:e997baa4f2e9139951b6f4c631bad912dfd3c792467e2f03d7239464af90e914"},
 ]
 sphinx = [
     {file = "Sphinx-1.8.5-py2.py3-none-any.whl", hash = "sha256:9f3e17c64b34afc653d7c5ec95766e03043cc6d80b0de224f59b6b6e19d37c3c"},
@@ -1366,12 +1397,13 @@ traitlets = [
     {file = "traitlets-4.3.3.tar.gz", hash = "sha256:d023ee369ddd2763310e4c3eae1ff649689440d4ae59d7485eb4cfbbe3e359f7"},
 ]
 typing = [
-    {file = "typing-3.7.4.3-py2-none-any.whl", hash = "sha256:283d868f5071ab9ad873e5e52268d611e851c870a2ba354193026f2dfb29d8b5"},
-    {file = "typing-3.7.4.3.tar.gz", hash = "sha256:1187fb9c82fd670d10aa07bbb6cfcfe4bdda42d6fab8d5134f04e8c4d0b71cc9"},
+    {file = "typing-3.10.0.0-py2-none-any.whl", hash = "sha256:c7219ef20c5fbf413b4567092adfc46fa6203cb8454eda33c3fc1afe1398a308"},
+    {file = "typing-3.10.0.0-py3-none-any.whl", hash = "sha256:12fbdfbe7d6cca1a42e485229afcb0b0c8259258cfb919b8a5e2a5c953742f89"},
+    {file = "typing-3.10.0.0.tar.gz", hash = "sha256:13b4ad211f54ddbf93e5901a9967b1e07720c1d1b78d596ac6a439641aa1b130"},
 ]
 urllib3 = [
-    {file = "urllib3-1.26.2-py2.py3-none-any.whl", hash = "sha256:d8ff90d979214d7b4f8ce956e80f4028fc6860e4431f731ea4a8c08f23f99473"},
-    {file = "urllib3-1.26.2.tar.gz", hash = "sha256:19188f96923873c92ccb987120ec4acaa12f0461fa9ce5d3d0772bc965a39e08"},
+    {file = "urllib3-1.26.4-py2.py3-none-any.whl", hash = "sha256:2f4da4594db7e1e110a944bb1b551fdf4e6c136ad42e4234131391e21eb5b0df"},
+    {file = "urllib3-1.26.4.tar.gz", hash = "sha256:e7b021f7241115872f92f43c6508082facffbd1c048e3c6e2bb9c2a157e28937"},
 ]
 wcwidth = [
     {file = "wcwidth-0.2.5-py2.py3-none-any.whl", hash = "sha256:beb4802a9cebb9144e99086eff703a642a13d6a0052920003a230f3294bbe784"},
diff --git a/pyproject.toml b/pyproject.toml
index b3408a3..1481773 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,9 +28,9 @@ pytest-pythonpath = "^0.7.3"
 ipdb = "^0.12.3"
 isort = "^4.3.21"
 wheel = "^0.33.6"
-Sphinx = {version = "<2.3.1", optional = true}
-recommonmark = {version = "^0.6.0", optional = true}
-sphinx_rtd_theme = {version = "^0.4.3", optional = true}
+Sphinx = "<2.3.1"
+recommonmark = "^0.6.0"
+sphinx_rtd_theme = "^0.4.3"
 
 [build-system]
 requires = ["poetry>=0.12"]
diff --git a/sample_schema.yml b/sample_schema.yml
index af4c192..25990ad 100644
--- a/sample_schema.yml
+++ b/sample_schema.yml
@@ -1,6 +1,7 @@
 tables:
  - auth_user:
     primary_key: id
+    chunk_size: 5000
     fields:
      - first_name:
         provider:
diff --git a/setup.py b/setup.py
index 9bc826a..b66266e 100755
--- a/setup.py
+++ b/setup.py
@@ -66,8 +66,8 @@ def run(self):
     long_description=read('README.rst'),
     author='Henning Kage',
     author_email='henning.kage@rheinwerk-verlag.de',
-    maintainer='Rheinwerk Verlag GmbH Webteam',
-    maintainer_email='webteam@rheinwerk-verlag.de',
+    maintainer='Henning Kage',
+    maintainer_email='henning.kage@rheinwerk-verlag.de',
     url='https://github.com/rheinwerk-verlag/postgresql-anonymizer',
     license='MIT license',
     classifiers=[