SYS.History.WriteDaemonserial class SYS.History.WriteDaemon
A class describing the metrics kept for the Write Daemon cycle history.
The system keeps a list of the last 20 cycles.
This class is primarily used as an embedded object in the PerfData interval collection. But it may also be accessed directly using the "Sample" query as an API to the Write Daemon cycle history.
Number of database buffers written during the cycle that were also written in the prior cycle.
Number of database buffers written during the cycle.
Time (in milliseconds) for the Write Daemon cycle to complete
Number of processes actively holding global buffers at the start of the cycle.
The size of database buffers (in KB) written during the cycle.
Time (in milliseconds) that the Write Daemon was inactive before this cycle began
Time that this Write Daemon cycle began
Number of "in-memory" (i.e. IRISTemp) buffers used at the start of the cycle.
Number of "in-memory" buffers written during the cycle (typically none written).
Start time as UTC date/time stamp in $ZTS format
Time (in milliseconds) that the Write Daemon was writing the Write Image Journal (WIJ) file
Time (in milliseconds) that the Write Daemon was writing buffers to the database(s)
Configure the summary methods for this class for either the Hourly or Daily summaries. This is a comma-delimited list of functions to use for the summary. The available functions are Average, Maximum (high-water mark), Minimum (lowest value), Standard Deviation, Median, and Total. These are abbreviated in the 'Function' argument as "Avg", "Max", "Min", StDev", Med", and "Tot". If nothing is specified, the default is "Avg,Max,StDev". You may also specify the string "None" for a summary period to disable that summary.
A null 'Function' argument will return the current summary setting in the 'Function' variable.
The 'Period' argument can be either "Hourly" or "Daily".
Selects StartTime As
%TimeStamp, Sleep As %Integer, WIJTime As %Integer, WriteTime As %Integer, CycleTime As %Integer, SizeWrite As %Integer, BufferWrite As %Integer, TempQueue As %Integer, TempWrite As %Integer, ProcInGlobal As %Integer, Flags As %Integer, TimeStamp As %String, BufferRedirty As %Integer
Fetch current Write Daemon cycle history.