snowflake backup

snowflake/README.md

@@ -15,3 +15,31 @@ https://docs.snowflake.com/en/user-guide/snowsql
 
 ## Connections 
 https://docs.snowflake.com/en/user-guide/ecosystem-etl  
+
+
+## System Setup
+https://docs.snowflake.com/en/sql-reference/parameters
+
+
+## Backup
+* https://docs.snowflake.com/en/user-guide/data-time-travel
+* ➕ cloned objects are independent of each other
+* SELECT ... AT|BEFORE TIMESTAMP|OFFSET|STATEMENT
+* CREATE ... CLONE ... AT|BEFORE https://docs.snowflake.com/en/sql-reference/sql/create-clone
+* UNDROP TABLE|SCHEMA|DATABASE ...
+
+    SHOW DATABASES HISTORY;
+
+    CREATE OR REPLACE TABLE MyTable_V2 CLONE MyTable;
+
+    CREATE SCHEMA mytestschema_clone_restore CLONE testschema BEFORE (TIMESTAMP => TO_TIMESTAMP(40*365*86400));
+
+
+
+## Restore
+
+### UNDROP
+https://www.snowflake.com/blog/undrop-a-table-database-or-schema/
+    UNDROP TABLE <tablename>;
+    UNDROP SCHEMA <schema name>;
+    UNDROP DATABASE <db name>;