Tag Archives: aurora

Amazon Aurora (MySQL) 推出的 Asynchronous Key Prefetch

Amazon Aurora (MySQL) 推出新的效能改善,可以改善 JOIN 時的效能:「Amazon Aurora (MySQL) Speeds Join Queries by More than 10x with Asynchronous Key Prefetch」。 看起來像是某個情況的 optimization,將可能的 random access 換成 sequential access 而得到大量的效能: This feature applies to queries that require use of the Batched Key Access … Continue reading

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Amazon Aurora 也支援 PostgreSQL 了

AWS 宣佈 Amazon Aurora 也支援 PostgreSQL 了,相容於 9.6.3 的版本 (應該就是改自這個版本):「Now Available – Amazon Aurora with PostgreSQL Compatibility」。 效能上一樣有提昇,不過數字參考用: On the performance side, you can expect up to 3x the throughput that you’d get if you ran PostgreSQL on your own … Continue reading

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Amazon Aurora 支援快速複製

Amazon Aurora 宣佈支援快速複製:「Amazon Aurora Fast Database Cloning」。 對於 2TB 的資料大約五分鐘就完成了: This means my 2TB snapshot restore job that used to take an hour is now ready in about 5 minutes – and most of that time is spent provisioning a … Continue reading

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Amazon Aurora 可以 clone 了...

Amazon Aurora 可以 clone 複製資料庫了:「Amazon Aurora Introduces Database Cloning Capabilities」。 而且是 COW 架構 (Copy on write),所以複製出來的部份不需要額外付儲存費用,只有修改的部份才要付費,這點相當殺啊: A cloning operation does not incur any storage charges. You will only be charged for additional storage space if you make data changes. 這對於「測試」這件事情變出不少變化可以用...

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Amazon Aurora 的論文

AWS 老大介紹自家產品 Amazon Aurora 的論文:「Weekend Reading: Amazon Aurora: Design Considerations for High Throughput Cloud-Native Relational Databases.」,論文在「Amazon Aurora: Design Considerations for High Throughput Cloud-Native Relational Databases」這邊可以取得。 Amazon Aurora 算是用很特別的架構達到高可靠架構的需求,主要用了一堆已經很強大的底層,像是用 Amazon S3 來交換一堆資料。 不過 AWS 在論文裡的比較的事情其實並不合現實,因為現在的 MySQL 在做分散式架構時的方式其實並不一樣 (i.e. Galera Cluster),論文裡提的很多比較的項目,其實都不是其他方式會遇到的問題,所以就看看就好,畢竟是在推銷自家產品...

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Amazon Aurora 改善 ALTER TABLE 時增加 column 的速度

Amazon Aurora (MySQL) 提昇了增加 column 操作的速度:「Amazon Aurora Supports Fast DDL Operations」,細節可以在「Amazon Aurora Under the Hood: Fast DDL」這邊看到。 這次加速是限制在 nullable 欄位: We’re addressing this mess, starting with the most common DDL operation we’ve seen: adding a nullable column at the end … Continue reading

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Amazon Aurora 支援更小的 t2.small

Amazon Aurora 本來最小台只支援到 t2.medium,現在則是多支援到 t2.small 了,對於更小的需求會更方便:「Amazon Aurora Cuts Entry-Level Pricing in Half With Support for T2.Small Instances」。 不過如果真的要小,而且不考慮會急速成長擴充的話,還是會往標準的 RDS 靠吧... 價錢上還是比較便宜。

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Amazon Aurora 支援 Auditing

AWS 的人把 auditing plugin 移植到 Amazon Aurora 的 MySQL 環境上了:「Auditing an Amazon Aurora Cluster」。 官方宣稱的效能很好,打開後不會掉太多: 主要原因是把寫 auditing log 這塊改寫掉: 這樣看起來頗不錯,平常其實可以開起來讓他記錄?

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Amazon Aurora 支援 PostgreSQL

Amazon Aurora 宣佈支援 PostgreSQL:「Amazon Aurora Update – PostgreSQL Compatibility」。 宣稱效能是原來的兩倍: Performance – Aurora delivers up to 2x the performance of PostgreSQL running in traditional environments. 目前是 Preview 版本,需要另外申請才能用。

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Amazon Aurora 支援 Reader Endpoint

Amazon Aurora 支援 Reader Endpoint,讓讀的部份可以打散掉:「New Reader Endpoint for Amazon Aurora – Load Balancing & Higher Availability」。 讀的部份比較容易 scale (常見的方式是透過 replication 做到),而現在很多 database framework (包括各類的 ORM framework) 都支援讀寫分離,這個支援對於系統的 scale 來說幫忙頗大。 不過不知道會不會有 replication lag 的問題,我猜是會有...

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