Why do we use open cursor in SAP ABAP?
An open cursor is linked to a multiple-line selection in the database table. To read the data into a target area in the ABAP program, use the following: FETCH NEXT CURSOR c INTO target. This writes one line of the selection into the target area target, and the cursor moves one line further in the selection set.
What is open cursor with hold in SAP ABAP?
WITH HOLD. Effect. The ABAP SQL statement OPEN CURSOR opens a database cursor for the result set of the main query defined after FOR and links a cursor variable dbcur with this database cursor. The results set of the main query can be read with the statement FETCH.
When would you use a cursor?
Use of Cursor The major function of a cursor is to retrieve data, one row at a time, from a result set, unlike the SQL commands which operate on all the rows in the result set at one time. Cursors are used when the user needs to update records in a singleton fashion or in a row by row manner, in a database table.
What is package size in SAP ABAP?
Package size is the keyword used in ABAP statements while doing large data extractions. The package size keyword helps to create an internal table large enough to fit well into the memory.
How do I use a parallel cursor in SAP ABAP?
Parallel Cursor Concept
- Step 01: Sort both the tables.
- Step 02: Write the first loop, like the previous way itself.
- Step 03: Read the second table with the key that was required to search the data.
- Step 04: If the above step executed successfully, it means data is there in the second table associated with the key.
What is the difference between cursor and SELECT?
CURSOR is mainly used to extract data in segments or chunks from the DB table. Conversely for the SELECT statement and its variants, data is directly copied into a data object in the ABAP memory.
Which clause is used to open the cursor?
To open a cursor, it is required to declare it first. It is declared using the DATA statement and special data type CURSOR. All clauses of SELECT statement can be used except the INTO clause. After the OPEN CURSOR statement, the database cursor points to the first line of the result set.
What are disadvantages of cursor?
Disadvantages of using Cursor: So occupies more resources and temporary storage. Each time when a row is fetched from the cursor it may result in a network round trip. This uses much more network bandwidth than the execution of a single SQL statement like SELECT or DELETE etc that makes only one round trip.
How many rows can a cursor hold?
A cursor can be viewed as a pointer to one row in a set of rows. The cursor can only reference one row at a time, but can move to other rows of the result set as needed.
What is meant by pack size?
Pack Size is the number of units per “case”. This is typically how you purchase your product from your Supplier. E.g., 1 case of beer has 24 bottles. So the pack size would contain 24 bottles when 1 case is purchased. Item Size is the measure in weight, volume, or “each” of a product.
How do you perform performance tuning in SAP ABAP?
ABAP Performance tips
- Using all the keys in SELECT statement.
- Avoid SELECT *
- Fetching Single Record.
- Avoid SELECT-ENDSELECT.
- Using Indexes.
- Avoid “INTO CORRESPONDING”
- SELECT statement inside LOOP.
- Nested SELECT statement.