Pdf abap performance tuning

Avoid the use of ranges in selects. While this is unrealistic in many cases, a limit of 8K oracle select statement exists and large ranges will cause ABAP programs to abend in production. As time goes on the range values tend to grow and larger and larger SQL statements are created. Avoid the use of NOT as index support is not provided.

An index is a search help to find data in the database. Every database table has a primary index consisting of all key fields. A database can have secondary indexes.

These are defined in the ABAP dictionary. Up to 16 indexes can be created - be careful!! When to create a secondary index. Fields are selected without index support. Often do SORTs without index support. Index Design a Index must be selective. In order to get the best usage of an index, specify all index fields within the WHERE clause "without gaps" i. The columns specified in the WHERE clause should also be in the same order as they are specified in the index.

Index Usage Guidelines 1. Specify field values without gaps. Do not use an OR operator for a field which is relevant for the index. Construct VIEWs with index usage in mind. Sorts on the database server will effect all users. The exception is huge sets of data e. In the case of large data sets, the DBMS can use an index and process more efficiently.

Also, if an index can be used for the sorting, there is hardly any additional cost for sorting on the database server. Take load off database where possible a Table buffering. To avoid expensive type conversions, always specify a type for formal parameters in subroutines. A binary search breaks a table into logical units based on the key defined. This allows the READ to jump through the table to find the required entry instead of sequentially reading each table row until the required entry is found.

Outer join can be created using this addition to the where clause in a select statement. It speeds up the performance tremendously, but the cons of using this variation are listed below. Duplicates are automatically removed from the resulting data set. Hence care should be taken that the unique key of the detail line items should be given in the select statement. If the table on which the For All Entries IN clause is based is empty, all rows are selected into the destination table.

Hence it is advisable to check before-hand that the first table is not empty. If the table on which the For All Entries IN clause is based is very large, the performance will go down instead of improving. Hence attempt should be made to keep the table size to a moderate level.

When a base table has multiple indices, the where clause should be in the order of the index, either a primary or a secondary index. To choose an index, the optimizer checks the field names specified in the where clause and then uses an index that has the same order of the fields.

One more tip is that if a table begins with MANDT, while an index does not, there is a high possibility that the optimizer might not use that index. In certain scenarios, it is advisable to check whether a new index can speed up the performance of a program. This will come handy in programs that access data from the finance tables. Instead of using the move-corresponding clause it is advisable to use the move statement instead.

Attempt should be made to move entire internal table headers in a single shot, rather than moving the fields one by one.

When multiple SAP tables are logically joined, it is always advisable to use inner join to read the data from them. Then give the Object name for which we want to trace the performance. Step1 : Go to tcode SE Give the program name and measurement restriction then execute it. It is recommended that we should create three measurement variants:. The measurement restriction has below three tabs:. Step 2 : After the test p rogram has finished , navigate back to the start screen of the ABAP Trace, where you will find the latest trace file.

Step 3 : During evaluation of the trace you will first see the overview screen. Including online book edition in dedicated reader application. In this book, you'll learn about: Analysis Tools Learn when and how to use analysis tools properly—including Code Inspector, performance trace, ABAP trace, and single records statistics.

Programming Technologies Get detailed information on parallel processing, internal tables, SQL data processing, and much more, and learn how these technologies affect performance.

Database Tuning Understand the database architecture and the technical background of database accesses, and master the tuning options for database accesses. Highlights include: Code and Memory Inspector. Reading Sample. Table of Contents. There's more to ABAP than procedural programming.

If you're ready to leap into the world of object-oriented programming OOP and ABAP Objects—or are already there and just need a refresher—then this is the book you've been looking for.