> ## Documentation Index
> Fetch the complete documentation index at: https://private-7c7dfe99-fix-nav-issues.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

> 0.5조 개의 레코드로 구성된 WikiStat 데이터셋을 살펴봅니다.

# WikiStat

이 데이터셋에는 0.5조 개의 레코드가 포함되어 있습니다.

FOSDEM 2023 비디오를 확인하세요: [https://www.youtube.com/watch?v=JlcI2Vfz\_uk](https://www.youtube.com/watch?v=JlcI2Vfz_uk)

발표 자료: [https://presentations.clickhouse.com/fosdem2023/](https://presentations.clickhouse.com/fosdem2023/)

데이터 소스: [https://dumps.wikimedia.org/other/pageviews/](https://dumps.wikimedia.org/other/pageviews/)

링크 목록 가져오기:

```shell theme={null}
for i in {2015..2023}; do
  for j in {01..12}; do
    echo "${i}-${j}" >&2
    curl -sSL "https://dumps.wikimedia.org/other/pageviews/$i/$i-$j/" \
      | grep -oE 'pageviews-[0-9]+-[0-9]+\.gz'
  done
done | sort | uniq | tee links.txt
```

데이터 다운로드:

```shell theme={null}
sed -r 's!pageviews-([0-9]{4})([0-9]{2})[0-9]{2}-[0-9]+\.gz!https://dumps.wikimedia.org/other/pageviews/\1/\1-\2/\0!' \
  links.txt | xargs -P3 wget --continue
```

(약 3일 정도 소요됩니다)

테이블 생성:

```sql theme={null}
CREATE TABLE wikistat
(
    time DateTime CODEC(Delta, ZSTD(3)),
    project LowCardinality(String),
    subproject LowCardinality(String),
    path String CODEC(ZSTD(3)),
    hits UInt64 CODEC(ZSTD(3))
)
ENGINE = MergeTree
ORDER BY (path, time);
```

데이터 로드:

```shell theme={null}
clickhouse-local --query "
  WITH replaceRegexpOne(_path, '^.+pageviews-(\\d{4})(\\d{2})(\\d{2})-(\\d{2})(\\d{2})(\\d{2}).gz$', '\1-\2-\3 \4-\5-\6')::DateTime AS time, 
       extractGroups(line, '^([^ \\.]+)(\\.[^ ]+)? +([^ ]+) +(\\d+) +(\\d+)$') AS values
  SELECT 
    time, 
    values[1] AS project,
    values[2] AS subproject,
    values[3] AS path,
    (values[4])::UInt64 AS hits
  FROM file('pageviews*.gz', LineAsString)
  WHERE length(values) = 5 FORMAT Native
" | clickhouse-client --query "INSERT INTO wikistat FORMAT Native"
```

또는 정리 데이터를 로드할 때:

```sql theme={null}
INSERT INTO wikistat WITH
    parseDateTimeBestEffort(extract(_file, '^pageviews-([\\d\\-]+)\\.gz$')) AS time,
    splitByChar(' ', line) AS values,
    splitByChar('.', values[1]) AS projects
SELECT
    time,
    projects[1] AS project,
    projects[2] AS subproject,
    decodeURLComponent(values[2]) AS path,
    CAST(values[3], 'UInt64') AS hits
FROM s3(
    'https://clickhouse-public-datasets.s3.amazonaws.com/wikistat/original/pageviews*.gz',
    LineAsString)
WHERE length(values) >= 3
```