1RRDUPDATE(1)                        rrdtool                       RRDUPDATE(1)
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NAME

6       rrdupdate - Store a new set of values into the RRD
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SYNOPSIS

9       rrdtool {update | updatev} filename [--template|-t ds-name[:ds-
10       name]...]  N|timestamp:value[:value...]  at-timestamp@value[:value...]
11       [timestamp:value[:value...] ...]
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DESCRIPTION

14       The update function feeds new data values into an RRD. The data is time
15       aligned (interpolated) according to the properties of the RRD to which
16       the data is written.
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18       updatev This alternate version of update takes the same arguments and
19               performs the same function. The v stands for verbose, which
20               describes the output returned. updatev returns a list of any
21               and all consolidated data points (CDPs) written to disk as a
22               result of the invocation of update. The values are indexed by
23               timestamp (time_t), RRA (consolidation function and PDPs per
24               CDP), and data source (name).  Note that depending on the
25               arguments of the current and previous call to update, the list
26               may have no entries or a large number of entries.
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28       filename
29               The name of the RRD you want to update.
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31       --template|-t ds-name[:ds-name]...
32               By default, the update function expects its data input in the
33               order the data sources are defined in the RRD, excluding any
34               COMPUTE data sources (i.e. if the third data source DST is
35               COMPUTE, the third input value will be mapped to the fourth
36               data source in the RRD and so on). This is not very error
37               resistant, as you might be sending the wrong data into an RRD.
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39               The template switch allows you to specify which data sources
40               you are going to update and in which order. If the data sources
41               specified in the template are not available in the RRD file,
42               the update process will abort with an error message.
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44               While it appears possible with the template switch to update
45               data sources asynchronously, RRDtool implicitly assigns non-
46               COMPUTE data sources missing from the template the *UNKNOWN*
47               value.
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49               Do not specify a value for a COMPUTE DST in the update
50               function. If this is done accidentally (and this can only be
51               done using the template switch), RRDtool will ignore the value
52               specified for the COMPUTE DST.
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54       N|timestamp:value[:value...]
55               The data used for updating the RRD was acquired at a certain
56               time. This time can either be defined in seconds since
57               1970-01-01 or by using the letter 'N', in which case the update
58               time is set to be the current time. Negative time values are
59               subtracted from the current time. An AT_STYLE TIME
60               SPECIFICATION (see the rrdfetch documentation) may also be used
61               by delimiting the end of the time specification with the '@'
62               character instead of a ':'. Getting the timing right to the
63               second is especially important when you are working with data-
64               sources of type COUNTER, DERIVE or ABSOLUTE.
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66               The remaining elements of the argument are DS updates. The
67               order of this list is the same as the order the data sources
68               were defined in the RRA. If there is no data for a certain
69               data-source, the letter U (e.g., N:0.1:U:1) can be specified.
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71               The format of the value acquired from the data source is
72               dependent on the data source type chosen. Normally it will be
73               numeric, but the data acquisition modules may impose their very
74               own parsing of this parameter as long as the colon (:) remains
75               the data source value separator.
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EXAMPLE

78       "rrdtool update demo1.rrd N:3.44:3.15:U:23"
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80       Update the database file demo1.rrd with 3 known and one *UNKNOWN*
81       value. Use the current time as the update time.
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83       "rrdtool update demo2.rrd 887457267:U 887457521:22 887457903:2.7"
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85       Update the database file demo2.rrd which expects data from a single
86       data-source, three times. First with an *UNKNOWN* value then with two
87       regular readings. The update interval seems to be around 300 seconds.
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AUTHOR

90       Tobias Oetiker <tobi@oetiker.ch>
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941.3.8                             2008-03-15                      RRDUPDATE(1)
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