- We must not consider Auto Scaling for Database Tier. It may not be applicable. It needs distributed architecture ; might be suitable for certain NoSQL DBs. Needs a test case prior to take decision for Production.
- For very small EC2 instance we must not consider Auto Scaling. Rather a bit lager EC2 instance can fix the issue.
- For very frequent changes, EC2 auto scaling may not be right choice. e.g: Cricket match update. Need to plan for CDN.
Logged operations are replicated. These include, but are not limited to: DDL DML Create/alter table space Create/alter storage group Create/alter buffer pool XML data. Logged LOBs Not logged operations are not replicated. These include, but are not limited to: Database configuration parameters (this allows primary and standby databases to be configured differently). "Not logged initially" tables Not logged LOBs UDF (User Defined Function) libraries. UDF DDL is replicated. But the libraries used by UDF (such as C or Java libraries) are not replicated, because they are not stored in the database. Users must manually copy the libraries to the standby. Note: You can use database configuration parameter BLOCKNONLOGGED to block not logged operations on the primary.
Comments