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Data Storage
MAXCS can store data using either an Internal Logger Service (ILS) or up
to two External Logger Service (ELS). CDR Search can use either ILS or
CDR to search stored data.
Call detail record data (CDR) and workgroup-related statistical data (RTM)
are stored in the same database but in different tables. These two storage
systems are described below.
Common Features of ILS and ELS
• Status can be monitored in MaxAdmin through the bottom of the Main
Window or through the Call Report window (System > Call Report)
• Broken and reconnection mechanism implemented on:
— TCP connection between MAXCS/ACM and Logger Service
— database connection between Logger Service and database
When the connection is broken, the sender will cache all data to the
first-in-first-out buffer. The sender will try to reconnect the receiver
automatically. Once the connection is back, all data will be sent. The
buffer is stored in memory and hard disk. The size limitation of each
buffer is 1G (data for approximately two months), or free size of hard
drive is less than 512 MB, whatever is met first. When the buffer is
overflowed, the earliest data is dropped.
• Auto check and upgrade database at startup—when Logger Service
starts, it performs the following:
1. Compares CDR structure with the current database used by
configuration.
2. If they are the same, there is no change.
3. If they are different, and the data can be upgraded, it will be
automatically upgraded.
4. If the database cannot be upgraded, it will rename the old database
and create a new database; the new database will then be used to
store data.
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