Magento – How to move products, categories and attributes from one store to another – Magento 1.8.1

This one worked for me in Magento ver. 2.1.0

SET FOREIGN_KEY_CHECKS = 0;

TRUNCATE TABLE catalog_category_entity;

TRUNCATE TABLE catalog_category_entity_datetime; 
TRUNCATE TABLE catalog_category_entity_decimal; 
TRUNCATE TABLE catalog_category_entity_int; 
TRUNCATE TABLE catalog_category_entity_text; 
TRUNCATE TABLE catalog_category_entity_varchar; 
TRUNCATE TABLE catalog_category_product; 
TRUNCATE TABLE catalog_category_product_index;

INSERT INTO `catalog_category_entity` (`entity_id`, `attribute_set_id`, `parent_id`, `created_at`, `updated_at`, `path`, `position`, `level`, `children_count`) VALUES ('1', '0', '0', CURRENT_TIMESTAMP, CURRENT_TIMESTAMP, '1', '0', '0', '1'),
('2', '3', '1', CURRENT_TIMESTAMP, CURRENT_TIMESTAMP, '1/2', '1', '1', '0');

INSERT INTO `catalog_category_entity_int` (`value_id`, `attribute_id`, `store_id`, `entity_id`, `value`) VALUES 
('1', '69', '0', '1', '1'),
('2', '46', '0', '2', '1'),
('3', '69', '0', '2', '1');

INSERT INTO `catalog_category_entity_varchar` (`value_id`, `attribute_id`, `store_id`, `entity_id`, `value`) VALUES 
('1', '45', '0', '1', 'Root Catalog'),
('2', '45', '0', '2', 'Default Category');

SET FOREIGN_KEY_CHECKS = 1;

DELETE FROM url_rewrite WHERE entity_type = 'category';

Seem that we need to increase the memory limit when running re-index a large of number database:

1) Reset db: open your PHP Admin or Mysql GUI tool

update indexer_state set status = 'invalid' where status != 'valid';

2) Re-index again:

php -dmemory_limit=2048M bin/magento indexer:reindex