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Fixed the typos in the Redshift section.

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max 2016-10-08 12:58:48 -07:00
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@ -1165,7 +1165,7 @@ Redshift
- 🔹Redshift does not support multi-AZ deployments. Building multi-AZ clusters is not trivial. [Here](https://blogs.aws.amazon.com/bigdata/post/Tx13ZDHZANSX9UX/Building-Multi-AZ-or-Multi-Region-Amazon-Redshift-Clusters) is an example using Kinesis.
- 🔸Beware of storing multiple small tables in Redshift. The way Redshift tables are laid out on disk makes it impractical. The minimum space required to store a table (in MB) is nodes * slices/node * columns. For example, on a 16 node cluster an empty table with 20 columns will occupy 640MB on disk.
- ⏱ Query performance degrades significatly during data ingestion. [WLM (Workload Management)](http://docs.aws.amazon.com/redshift/latest/dg/c_workload_mngmt_classification.html) tweaks help to some extent. However, if you need consistent read performance, consider having replica clusters (at the extra cost) and swap them during update.
- ❗ Never resize a live cluster. The resize operation takes hours depending on the dataset size. In rare cases, the operation may also get stuck and you'll end up having the non-functional cluster. The safer approach is to create a new cluster from a snapshot, resize the new cluster and shut down the old one.
- ❗ Never resize a live cluster. The resize operation takes hours depending on the dataset size. In rare cases, the operation may also get stuck and you'll end up having a non-functional cluster. The safer approach is to create a new cluster from a snapshot, resize the new cluster and shut down the old one.
- Redshift has reserved keywords which are not present in Postgres (see full list [here](https://docs.aws.amazon.com/redshift/latest/dg/r_pg_keywords.html)). Watch out for DELTA ([Delta Encodings](https://docs.aws.amazon.com/redshift/latest/dg/c_Delta_encoding.html)).
- Redshift does not support many Postgres functions, most notably several date/time-related and aggregation functions. See the [full list here](https://docs.aws.amazon.com/redshift/latest/dg/c_unsupported-postgresql-functions.html).