Take into account the following behaviours when using the Aggregation profile:
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The contents of the buttons in the menu bar may change depending on which configuration type has been opened in the currently active tab. The Aggregation profile uses the standard buttons that are visible for all configurations, and these are described in Build View.
Session Tab
In the Session tab you can browse and select a Session UDR Type and configure the Storage selection settings.
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Storage Host | Select a Storage Host from the drop-down list. For storage of aggregation sessions select either a specific EC Group or Automatic. If you select Automatic, the same EC Group that has been used by the running workflow will be applied. Alternatively, if the Aggregation Session Inspector is used, a storage host is selected automatically. Refer to Aggregation Session Inspector for further information on the Aggregation Session Inspector.
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Directory | Enter the directory on the Storage Host where you want the aggregation data to be stored.
If this field is greyed out with a stated directory, it means that the directory path has been hard coded using the
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Partial File Count | In this field, you can enter the maximum number of partial files that you want to store. Consider the following: Startup: All the files are read at startup. It takes longer if there are many partial files. Transaction commitment: When the transactions are committed, many small files (large Partial File Count) increase performance. In a batch workflow, use this variable to tune performance.
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Max Cached Sessions | Enter the maximum number of sessions to keep in the memory cache. This is a performance-tuning parameter that determines the memory usage of the Aggregation agent. Set this value to be low enough so that there is still enough space for the cache in memory, but not too low, as this will cause performance to deteriorate. For further information see the section below, Performance Tuning with File Storage. |
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Sometimes, you may notice that file storage takes up more space than expected. This is expected behaviour. Read through this note for an overall understanding of the way file storage in Aggregation works. When session data is stored, it is appended to the session file. This means that old session data from the session file is still present in the storage and the current version is added to the file. Removal of old data is done only under certain conditions because otherwise, aggregation handling would be too slow. This is why file storage takes up more space than calculated with session number and single session object size. The session files on the disk grow up to a certain threshold ( 50MB by default) and then a new file is created and used. The old session file will be deleted when no more active sessions are stored in it. The accepted size of a session file can be adjusted by using aggregation.min_session_file_size parameter. For instance, aggregation.min_session_file_size=20000000 will set it to 20MB. This parameter is set with the mzsh topo command on EC, cell or container level. Old files are removed during the storage commit. Also, since there is a possibility that there will be old session files present because of some long-lived sessions stored there, a defragmentation algorithm is implemented. It runs occasionally and moves those long-lived sessions to new session files so that old session files can be deleted. This is why aggregation storage takes up a lot of disk space. It is designed to provide higher performance at the expense of higher disk space consumption. |
Couchbase Storage
The Aggregation profile configuration dialog - Couchbase Storage
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| Setting | Description | ||||||||||||||||||||||
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| Profile | Select an SQL profile. This profile is used to access the storage for aggregation sessions.
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| Index Fields | Click the Add | ||||||||||||||||||||||
| Table SQL Script | This text box will generate the SQL statements for the selected UDRs' table schema and indexes for Id, TxId. The schema will be generated based on the number of UDRs in the UDR Type Mapping table.
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