We can even find a set of built-in functions that return system information apart from the use of the log files and Transact-SQL statements. In this article, let’s have an overview of the key built-in functions and their usages. The values returned by these functions are cumulative from the time SQL Server was last started.
Function |
Description |
Example |
@@connections |
Returns the number of connections or attempted connections |
select @@connections as 'Total Login Attempts' |
@@cpu_busy |
Returns CPU processing time in milliseconds for SQL Server activity |
select @@cpu_busy as 'CPU Busy', getdate() as 'Since' |
@@idle |
Returns SQL Server idle time in milliseconds |
select @@idle as 'Idle Time', getdate() as 'Since' |
@@io_busy |
Returns I/O processing time in milliseconds |
select @@io_busy as 'IO Time', getdate() as 'Since' for SQL Server |
@@pack_received |
Returns the number of input packets read from the network by SQL Server |
select @@pack_received as 'Packets Received' |
@@pack_sent |
Returns the number of output packets written to the network by SQL Server |
select @@pack_sent as 'Packets Sent' |
@@packet_errors |
Returns the number of network packet errors for SQL Server connections |
select @@packet_errors as 'Packet Errors' |
@@timeticks |
Returns the number of microseconds per CPU clock tick |
select @@timeticks as 'Clock Ticks' |
@@total_errors |
Returns the number of disk read/write errors encountered by SQL Server |
select @@total_errors as 'Total Errors', getdate() as 'Since' |
@@total_read |
Returns the number of disk reads by SQL Server |
select @@total_read as 'Reads', getdate() as 'Since' |
@@total_write |
Returns the number of disk writes by SQL Server |
select @@total_write as 'Writes', getdate() as 'Since' |
fn_virtualfilestats |
Returns input/output statistics for data and log files |
select * from fn_virtualfilestats(null,null) |
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