wkaczurba
Cosmodb:
Generally the tutorial does not provide much examples information about how to use cosmodb for APPS.
I could not find how to read actual data from containers using azure cli.
Simple DB + container + item creation for NOSQL CosomosDB is here: https://github.com/wkaczurba/az204-cosmos
Consistency levels:
Supported APIs:
- NoSQL
- MongoDB
- PostgreSQL
- Apache Cassandra (column-oriented…)
- Table (replacement for Table storage)
- Apache Gremlin
RUs modes:
- Provisioned throughput mode (increments of 100RUs/sec); can change levels programatically
- Serverless mode
- Autoscale mode (for unpredictable traffice patterns that require SLAs on high performance and scale)
Database vs containers
Documentation from Microsoft is here
Database is a namespace that can hold group of contgainers.
- NOSQL API
- database
- container1
- container2
- container3…
- database2
- container4…
- container5…
- database
Stored procs
Official tutorial: Create stored procedures
- Tutorial exmaples are not always working as expected (returning errors)
- Original samples provided by Azure Portal work better.
Pre/post-triggers.
TODO: Pretrigger did not work as expected. Try it again.
Change feed
Official tutorial here: Explore change feed in Azure Cosmos DB
Push model:
- Azure Functions Azure Cosmos DB triggers: here Azure Functions bindings for Cosmos DB
- change feed processor library - .NET v3 or Java V4 SDK. Components:
- monitored container - container that has the data from which the change feed is generated. Any changes inserts/updates to the monitored container are reflected in the chnage feed of the container.
- lease container - container for tracking progress/coordination across workers
- compute instance - ref to actual host for code (VM, AKS pod, Azure App Service or actual physical machine)
- delegate - code the defines what to do once batch of changes is read.
Java - change feed tutorial: