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VMware VCENTER CHARGEBACK 1.5 - API Manual de usuario Pagina 18

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Maximum Number of Connections to the Database
The vCenter Chargeback Manager and corresponding data collectors, including the vCloud Director data
collector and vShield Manager data collector, connect to the vCenter Chargeback Manager database to read
and write data. You must configure the database to ensure that the maximum number of connections can be
made to the vCenter Chargeback Manager database by each of the components.
Table 3-1 lists the maximum number of connections made to the vCenter Chargeback Manager database by
a single instance of vCenter Chargeback Manager, vCenter Chargeback Manager data collector, vCloud
Director data collector, and vShield Manager data collector. The table also lists the maximum connections
made to the vCenter Server database by a single instance of the vCenter Chargeback Manager data collector.
Table 3‑1. Maximum Number of Database Connections
Component Database Maximum Connections
vCenter Chargeback Manager server vCenter Chargeback Manager
database
50
vCenter Chargeback Manager data
collector
vCenter Chargeback Manager
database
35
vCloud Director data collector vCenter Chargeback Manager
database
10
Although a single connection is made,
the connection pool requires 10
connections
vShield Manager data collector vCenter Chargeback Manager
database
10
Although a single connection is made,
the connection pool requires 10
connections
vCenter Chargeback Manager data
collector
vCenter Server database 5
If you have a vCenter Chargeback Manager cluster and also multiple instances of the vCenter Chargeback
Manager data collector, then you must configure the database connection numbers appropriately.
Other System Prerequisites
Apart from the networking and database management related prerequisites, you must perform few other
pre-installation tasks to ensure that vCenter Chargeback Manager is successfully installed and upgraded.
You must perform the following pre-install tasks:
n
Ensure that system time of all the servers and databases are in sync.
You must ensure that the system time of the machines on which you install vCenter Chargeback
Manager and vCenter Chargeback Manager database are in sync. If you plan to install one or more data
collectors on different machines, then the system time of these machines must be in sync with that of
the machines on which vCenter Chargeback Manager and vCenter Chargeback Manager database are
installed.
Also, the system time of the vCenter Servers and the vCenter Server databases that you configure in
vCenter Chargeback Manager must be in sync with the that of the machine on which vCenter
Chargeback Manager is installed. In short, the system time of the machines on which vCenter
Chargeback Manager and the applications and databases that it communicates with are installed must
be in sync.
vCenter Chargeback Manager Installation and Upgrade Guide
18 VMware, Inc.
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