For operational reasons, you should familiarize yourself with the underlying database schema. The schema is implemented as two tables, Streams and Messages, and a number of indexes.

The Streams table contains the collection of unique streams in the store. As stream Ids are strings there are a number of optimisations applied:

1. The original stream Id is stored in column IdOriginal and limited to 1000 characters.

2. When a stream is appended for first time is it checked to see if it is parsable as a Guid. If so, then that is stored in the Id column. If not then a Sha1 hash of the Id is generated and used. This helps with stream lookups and the Id unique index constraint.

3. An IdInternal identity column is used for joins with the messages table.

Please refer to CreateSchema.sql for full schema details.

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