Use of informatica session

If you want the workflow to store the last 20 logs, set the Config Object in the session, configure the log options, save session log: sessions run ; saveessio log for these runs: 20
There is a tracing level tracing level in the source below the session
:
Terse Normal: There is some load information in the Intergration service. 
Each piece of information in the load in Verbose data: source will be recorded in the log
Verbose Initalization: The index that is useful in the target will be recorded in the log. In general, we choose normal
target load type:
bulk, which means that the data from source to target is directly submitted in batches, and the target in the DB cannot have index, primary key
normal: record redo, undo log, generally recommended
1) Reusable session: in It is added in the task designer of workflow, click the task in the menu bar, create can be created. A reusable session can be used multiple times in different workflows.
Non-reusable session: add it in the workflow designer, click the task in the menu bar, and create it.
If you need to perform expression processing on the source data, from the source qualifier to the expression link, the general practice is to drag all the fields into the expression, and the processing that needs to be processed is directly output to the target without processing. Rare practice: direct columns that do not require expression processing from source qualifier to target.
2) The setting of the session log options option
save session log by:
When set to session runs, a log file will be generated for each run, which can be saved up to 20 times in the production environment, save session log for these runs=20
when the session is set When the timestamp is used, there is only one log file, and it will be appended every time according to the timestamp. If this time is selected, the file will be large and rarely used.
3) recovery strategy:
set fail parent if the task fail or fail in the general option parent if the task does not run, recovery strategy=file task and continue workflow,
then even if the session fails, the workflow will be executed and failed may be displayed.