What is temporary table in SAP HANA?

What is temporary table in SAP HANA?

Temporary Table: Temporary Tables lets you store and process intermediate results. Temporary tables only last as long as the session is alive. Data in temporary tables is automatically deleted at the end of the database session, even if it ends abnormally.

What is the use of temporary table?

A temporary table exist solely for storing data within a session. The best time to use temporary tables are when you need to store information within SQL server for use over a number of SQL transactions.

What is difference between a table and a temporary table?

Table variable can be used by the current user only. Temp table will be stored in the tempdb. Table variable will store in the physical memory for some of the data, then later when the size increases it will be moved to the tempdb. Temp table can do all the DDL operations.

How do I create a local temporary table?

A local temporary table is created using CREATE TABLE statement with the table name prefixed with single number sign (#table_name). In SQL Server, local temporary tables are visible only in the current session. So if you create a local temporary table in one session, you cannot access it in other sessions.

How do I drop a table in SAP HANA?

Use the DROP TABLE command to drop a table in the Spark context as well as delete the corresponding in-memory SAP HANA Vora table. This command allows you to free cluster memory. If the specified table is referenced more than once in the SAP HANA Vora catalog, the drop table action will fail.

How do you create a global table in SAP ABAP?

Procedure

1. In SQL Central, use the SQL Anywhere 17 plug-in to connect to the database.
2. Right-click Tables, and then click New Global Temporary Table .
3. Follow the instructions in the Create Global Temporary Table Wizard.
4. In the right pane, click the Columns tab and configure the table.
5. Click File Save .

What is the advantage of using temporary table instead of heap table?

They use indexes which make them faster. Temporary table : The temporary tables could be very useful in some cases to keep temporary data. Temporary table is that they will be deleted when the current client session terminates.

Does using temp tables improve performance?

Even if you can’t remove a temporary table, you may be able to drastically improve performance by making sure that the code that populates the temporary table is correctly filtering the data pulled from source tables.

Which is better temp table or table variable?

A temp table can have indexes, whereas a table variable can only have a primary index. If speed is an issue Table variables can be faster, but obviously if there are a lot of records, or the need to search the temp table of a clustered index, then a Temp Table would be better.

What is difference between local and global temporary table?

Local temporary tables are deleted after the user disconnects from the instance of SQL Server. Global temporary tables are visible to any user and any connection after they are created, and are deleted when all users that are referencing the table disconnect from the instance of SQL Server.

How do I drop a table in SAP?

DROP TABLE statement

1. ::= DROP TABLE []
2. If the name of the schema is not specified in the table name, the current schema is accepted/used.

How do you edit a table in SAP HANA?

1. To Create Table:
2. To View the data from the table:
3. To alter Column Store to Row Store table:
4. To alter Row Store to Column Store table:
5. Alter table to add an additional column.
6. Alter table to change the data type of an existing column.
7. To Alter Existing Column with NOT NULL.
8. To Add Primary Key for Existing table column.

How does a temporary table work in SAP HANA?

A Global table structure is shared with all sessions using the same connection but data is private to a session. A Local table structure and data is private to the session. A sap hana temporary table can be of type row or of type column. It exists as long as the session owner exists or until it has been dropped manually.

What happens when you leave a Hana session?

Actual data content is deleted/truncated when you leave the HANA session. For those who landed here while searching on temporary table topic: this limitation of local temporary tables has been fixed in current version of Hana, so that local temp tables can be created within the stored procedure.

How to create a table in HANA database?

Instead of a local temp. table you can use a table variable in most cases. By querying sys.table_columns view, you can get the list and properties of source table and build a dynamic CREATE script then Execute to create the table. You can find SQL codes for a sample case at Create Table Dynamically on HANA Database

Can a global temporary table be used as a temporary table?

You could instead use a global temporary table (only metadata is persistent) or a normal table (both metadata and data persists).