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QlikView Server Load Sharing (Clustering)


Clustering overview
Executable %ProgramFiles%\QlikView\Server\QVS.exe
Data %ProgramData%\QlikTech\QlikViewServer
Listens to QVP: 4747; QVP (tunneling): 4774; Broadcast: 14747; SNMP: 161
Uses/Controls -
Used by QDS, QMS, QVWS, QlikView Desktop/QlikView plugin/OCX


Settings and Configuration

Configuration files
File Description
Settings.ini Stores the QlikView Server (QVS) settings. Manual changes in this file require restart of QVS. This file is always stored in the “Data” folder.


QVS uses .pgo files to coordinate a cluster. The files are stored in the “Data” folder.

Cluster files
File Description
BorrowedCalData.pgo Keeps track of borrowed Client Access Licenses (CALs).
CalData.pgo Keeps track of CALs.
IniData.pgo Coordinated version of Settings.ini.
ServerCounters.pgo Keeps track of statistics.
TicketData.pgo Keeps track of tickets.


The logs are kept one per node in the cluster. The log files are stored in the “Data” folder by default.

Log files
File Description
Events_<computer_name>.log Event log.
Performance_<computer_name>.log Performance log.
Sessions_<computer_name>.log Session log.

Special Folders

The special folders are stored in the “Data” folder.

Special folders
Folder Description
Information note The Extensions folder has to be created manually.

By default, QVS looks for extensions in this folder. Extension objects are located in Extensions\Objects and document extensions are located in Extensions\Document. Use QlikView Management Console (QMC) to manage all extensions in one place in case of a cluster.

Temp By default, QVS puts temporary files in this folder (for example, when exporting using the AJAX client, a temporary file is created in the folder).

Load Sharing (Clustering)

All clustering requires a cluster-enabled QlikView Server license. QlikView Server supports load sharing of documents across multiple machines. This sharing includes the ability to share in real time, information about server objects, automated document loading, and user license CALs. Special licensing is available to enable multiple server instances share the same license number.

Load sharing using the QlikView web server. A developer passes information to a web server, which passes it to multiple QlikView servers, which pass it to a Windows-based file share.

Load sharing using QlikView Web Server

To use load sharing between multiple QVSs, all document and support files must be shared between the servers. In other words, all servers should point to the same physical location for the files. QVS creates and maintains additional files to store load sharing data. These files have a Persistent Group Object (.pgo) file type extension and are located in the “Data” folder. These files are locked when QVS is running. The different .pgo files contain information on borrowed CALs, CALs in use, server settings, and ticket data.

Operating system load balance or failover configurations are external to the QVS load sharing configuration, and QVS has no control over those systems.

Server configuration settings are shared between all clustered QVSs and can be maintained through QMC connected to any of the clustered QVSs. Performance of a particular QVS system can be monitored through QMC by connecting to that system. The load balancing settings, that is, which QVS the client should be directed to, are stored in QlikView Web Server (QVWS).

Document-related meta data is shared via .meta files (one per document). This data is often referred to as Document Metadata Service (DMS) data. Since DMS data is shared among the QVSs, any automated document load procedures are performed on all servers. DMS authorization is also shared among all clustered QVSs.

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