How take daily snapshot of table in SQL Server?

How take daily snapshot of table in SQL Server?

1 Answer

1. Create a new table each day, and copy the data of your table in it;
2. Create one new table with the same structure as your table, plus one additional date column, to store the date of the snapshot taken, then each day copy your table along with the current system date;

How do I make a snapshot table?

CREATE SNAPSHOT emp_snap as select * from emp; Complex snapshot : In complex snapshot, a row may be based on more than one row in a remote table via GROUP BY operation or result of Multi-Table Join. This consists of joined tables, views, or grouped and complex SELECT statement queries.

What is table snapshot?

A snapshot table holds the same raw, transactional data as its source in the transactional system, with additional fields for tracking the snapshot date. Snapshot tables are populated nightly with those rows of data that are considered effective (i.e., current) in the source table at the time of the extract.

How are snapshots used to track data changes?

By snapshotting your sources, you can maximize the amount of data that you track, and in turn, maximize your modeling optionality. By contrast, a snapshot that runs on top of a model will record changes to “transformed” data. If the logic in a model upstream of a snapshot changes, then the snapshot operation will record different data.

How to track data changes with DBT snapshots?

Snapshots are simple select statements which define a dataset. Every time you run the dbt snapshot command, dbt will run your select statement and check if the dataset has changed compared to its last known state. If the records have changed, then dbt will create a new entry in the snapshot table for the new state of the record.

How to take daily snapshot of table in SQL Server?

One of the tables has to be a hierarchy of product reps and their assigned area. Orese reps and their area change every day, and I need to keep track of what exactly that table looks like every day. I will need to take snapshots of the table daily.

Is there a way to know when data has changed?

Some data sources do not include a reliable timestamp that indicates when a record has changed. If this is the case for your data, you can instead use the check strategy. This strategy works by comparing the values of a list of columns between their current and snapshotted values.