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pg_pageinspect_plus を作りました
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Haruka Takatsuka
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PostgreSQLで物理データ解析に使用する拡張 pageinspect を使いやすくする 拡張 pg_pageinspect_plus の紹介です。
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pg_pageinspect_plus を作りました
1.
1 pg_pageinspect_plus を作りました 2020-08-26 PostgreSQL アンカンファレンス 日本 PostgreSQL
ユーザ会 高塚 遥
2.
2 PostgreSQL の物理データ解析 ● PostgreSQL のデータが壊れた ● メモリ障害、ストレージ障害 ● ファイルシステム障害 ● PostgreSQL
のバグを踏んだ ● DRBD の類の誤動作、誤操作で壊した → どんな具合に壊れたか調べたい → 救出できるデータを救出したい
3.
3 contrib/pageinspect このテーブルの 物理データが こう見れる
4.
4 この関数が指定テーブル、指定ページの bytea 型データを返す。 他の PostgreSQL
データを読んで bytea 型データとして与えて 使うこともできる。 そうした方が良い。
5.
5 pg_pageinspect_plus pageinspect の tuple_data_split
関数に pg_pageinspect_plus の tuple_data_parse 関数を被せる。 人間に読める形式になる!
6.
6 個別の 変換関数 も提供 これらを 型キャストとして 提供しないの? トラブルの元に なりそう。 + 作者の調査不足。
7.
7 実装コードはとっても短い C コードの 一部抜粋
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