# Wikipedia data

```sh
./download-wikipedia-dump.sh
node --max-old-space-size=10096 database-wikipedia.js
```

## Utils

Show the first 10 line of sql file: `head -n 10 ./dump/page.sql`

Show the first 10 characters of sql file: `head -c 10 ./dump/page.sql`

To inspect volume size used by database: `docker system df -v | grep 'wikipedia-solver-mariadb-data'`

## Remove a volume

```sh
# List all volumes
docker volume ls

# Remove a volume
docker volume rm data_wikipedia-solver-mariadb-data

# Or by using docker compose down
docker-compose down --volumes
```

## MySQL Related

<https://stackoverflow.com/questions/43954631/issues-with-wikipedia-dump-table-pagelinks>

MySQL any way to import a huge (32 GB) sql dump faster?: <https://stackoverflow.com/questions/40384864/importing-wikipedia-dump-to-mysql>

Import data.sql MySQL Docker Container: <https://stackoverflow.com/questions/43880026/import-data-sql-mysql-docker-container>

<https://dba.stackexchange.com/questions/83125/mysql-any-way-to-import-a-huge-32-gb-sql-dump-faster>

## Dumps Links

- Database layout: <https://www.mediawiki.org/wiki/Manual:Database_layout>
- <https://en.wikipedia.org/wiki/Wikipedia:Database_download>
- <https://dumps.wikimedia.org/enwiki/>
- Run SQL queries against Wikipedia: <https://quarry.wmcloud.org/>

```sql
-- Get the sanitized title of a page linked in the page with title 'Node.js'
SELECT lt.lt_title FROM linktarget lt WHERE lt.lt_id = (
  SELECT pl.pl_target_id FROM pagelinks pl WHERE pl.pl_from = (
    SELECT p.page_id FROM page p WHERE p.page_title = 'Node.js' AND p.page_namespace = 0
  ) LIMIT 1
);
```

## `page.sql.gz` - MySQL full version up until inserts

```sql
-- MySQL dump 10.19  Distrib 10.3.38-MariaDB, for debian-linux-gnu (x86_64)
--
-- Host: db1206    Database: enwiki
-- ------------------------------------------------------
-- Server version	10.4.26-MariaDB-log

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;
/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
/*!40103 SET TIME_ZONE='+00:00' */;
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;

--
-- Table structure for table `page`
--

DROP TABLE IF EXISTS `page`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `page` (
  `page_id` int(8) unsigned NOT NULL AUTO_INCREMENT,
  `page_namespace` int(11) NOT NULL DEFAULT 0,
  `page_title` varbinary(255) NOT NULL DEFAULT '',
  `page_is_redirect` tinyint(1) unsigned NOT NULL DEFAULT 0,
  `page_is_new` tinyint(1) unsigned NOT NULL DEFAULT 0,
  `page_random` double unsigned NOT NULL DEFAULT 0,
  `page_touched` binary(14) NOT NULL,
  `page_links_updated` varbinary(14) DEFAULT NULL,
  `page_latest` int(8) unsigned NOT NULL DEFAULT 0,
  `page_len` int(8) unsigned NOT NULL DEFAULT 0,
  `page_content_model` varbinary(32) DEFAULT NULL,
  `page_lang` varbinary(35) DEFAULT NULL,
  PRIMARY KEY (`page_id`),
  UNIQUE KEY `page_name_title` (`page_namespace`,`page_title`),
  KEY `page_random` (`page_random`),
  KEY `page_len` (`page_len`),
  KEY `page_redirect_namespace_len` (`page_is_redirect`,`page_namespace`,`page_len`)
) ENGINE=InnoDB AUTO_INCREMENT=76684425 DEFAULT CHARSET=binary ROW_FORMAT=COMPRESSED;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `page`
--
```

## `pagelinks.sql.gz` - MySQL full version up until inserts

```sql
-- MySQL dump 10.19  Distrib 10.3.38-MariaDB, for debian-linux-gnu (x86_64)
--
-- Host: db1206    Database: enwiki
-- ------------------------------------------------------
-- Server version	10.4.26-MariaDB-log

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;
/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
/*!40103 SET TIME_ZONE='+00:00' */;
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;

--
-- Table structure for table `pagelinks`
--

DROP TABLE IF EXISTS `pagelinks`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `pagelinks` (
  `pl_from` int(8) unsigned NOT NULL DEFAULT 0,
  `pl_namespace` int(11) NOT NULL DEFAULT 0,
  `pl_title` varbinary(255) NOT NULL DEFAULT '',
  `pl_from_namespace` int(11) NOT NULL DEFAULT 0,
  `pl_target_id` bigint(20) unsigned DEFAULT NULL,
  PRIMARY KEY (`pl_from`,`pl_namespace`,`pl_title`),
  KEY `pl_namespace` (`pl_namespace`,`pl_title`,`pl_from`),
  KEY `pl_backlinks_namespace` (`pl_from_namespace`,`pl_namespace`,`pl_title`,`pl_from`),
  KEY `pl_target_id` (`pl_target_id`,`pl_from`),
  KEY `pl_backlinks_namespace_target_id` (`pl_from_namespace`,`pl_target_id`,`pl_from`)
) ENGINE=InnoDB DEFAULT CHARSET=binary ROW_FORMAT=COMPRESSED;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `pagelinks`
--
```