Information About Default Operating Mode

Hello,
Someone can help me and give me a good documentation that explain what do the SETBASED mode, ROWBASED, ROWBASED (target only), with schemas it will be exellent.
I know a little the differences between but i will to learn that in detail.
I ask that because we have to make programs that are the most optimize (time of execution) and the Operating Mode is very important.

When a mapping runs in a set-based mode, the rows are processed as a single dataset, with a single SQL statement that is either completed successfully for all the rows or fails if there is a problem with even one row. This is generally the fastest way of processing data.
When a mapping runs in a row-based mode, the data can be extracted from the source one at a time, processed and inserted in the target. If there is a problem with some rows, this is logged and the processing continues.
Needless to say, the set based operating mode is faster in all cases, while the row based operating mode gives more control to the user, both in terms of logging row-by-row processing information as well as in terms of control over the management of incorrect data.
The default operating mode is the set based, fail over to row based mode in which Warehouse builder will attempt to use the better-performing set-based operating mode, but will fall back to the more granular row-based mode if data errors are encountered. This mode allows the user to get the speed of set based processing but when an unexpected error occurs it allows you to revert to row based mode.
The operating modes Row Based (Target Only) and Set Based Fail over to Row based (Target Only) are a compromise between the set based and the row based modes. The ‘target only’ modes will use a cursor to rapidly extract all the data from the source, but will then use a row-based mode to insert data into the target, where errors are more likely to occur. These modes should be used if there is a need to use the fast, set based mode to extract and transform the data as well as a need to extensively monitor the data errors.
I am currently writing a paper on OWB performance, and if you are interested, drop me an e-mail ([email protected]) and I will send you a draft version of it.
Regards:
Igor

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    <b>
    Choosing a Table Type</b>
    The table type (and particularly the access method) that you will use depends on how the typical internal table operations will be most frequently executed.
    <b>
    Standard tables</b>
    This is the most appropriate type if you are going to address the individual table entries using the index. Index access is the quickest possible access. You should fill a standard table by appending lines (ABAP APPEND statement), and read, modify and delete entries by specifying the index (INDEX option with the relevant ABAP command). The access time for a standard table increases in a linear relationship with the number of table entries. If you need key access, standard tables are particularly useful if you can fill and process the table in separate steps. For example, you could fill the table by appending entries, and then sort it. If you use the binary search option with key access, the response time is logarithmically proportional to the number of table entries.
    <b>Sorted tables</b>
    This is the most appropriate type if you need a table which is sorted as you fill it. You fill sorted tables using the INSERT statement. Entries are inserted according to the sort sequence defined through the table key. Any illegal entries are recognized as soon as you try to add them to the table. The response time for key access is logarithmically proportional to the number of table entries, since the system always uses a binary search. Sorted tables are particularly useful for partially sequential processing in a LOOP if you specify the beginning of the table key in the WHERE condition.
    <b>
    Hashed tables</b>
    This is the most appropriate type for any table where the main operation is key access. You cannot access a hashed table using its index. The response time for key access remains constant, regardless of the number of table entries. Like database tables, hashed tables always have a unique key. Hashed tables are useful if you want to construct and use an internal table which resembles a database table or for processing large amounts of data.
    regards,
    sai ramesh

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