RRDUPDATE(1)                        rrdtool                       RRDUPDATE(1)



NNAAMMEE
       rrdupdate - Store a new set of values into the RRD

SSYYNNOOPPSSIISS
       rrrrddttooooll {uuppddaattee | uuppddaatteevv} _f_i_l_e_n_a_m_e [----tteemmppllaattee|--tt _d_s_-_n_a_m_e[::_d_s_-
       _n_a_m_e]...] [----] NN|_t_i_m_e_s_t_a_m_p::_v_a_l_u_e[::_v_a_l_u_e...]  _a_t_-
       _t_i_m_e_s_t_a_m_p@@_v_a_l_u_e[::_v_a_l_u_e...]  [_t_i_m_e_s_t_a_m_p::_v_a_l_u_e[::_v_a_l_u_e...] ...]

DDEESSCCRRIIPPTTIIOONN
       The uuppddaattee function feeds new data values into an RRRRDD. The data is time
       aligned (interpolated) according to the properties of the RRRRDD to which
       the data is written.

       uuppddaatteevv This alternate version of uuppddaattee takes the same arguments and
               performs the same function. The _v stands for _v_e_r_b_o_s_e, which
               describes the output returned. uuppddaatteevv returns a list of any
               and all consolidated data points (CDPs) written to disk as a
               result of the invocation of update. The values are indexed by
               timestamp (time_t), RRA (consolidation function and PDPs per
               CDP), and data source (name).  Note that depending on the
               arguments of the current and previous call to update, the list
               may have no entries or a large number of entries.

       _f_i_l_e_n_a_m_e
               The name of the RRRRDD you want to update.

       ----tteemmppllaattee|--tt _d_s_-_n_a_m_e[::_d_s_-_n_a_m_e]...
               By default, the uuppddaattee function expects its data input in the
               order the data sources are defined in the RRD, excluding any
               COMPUTE data sources (i.e. if the third data source DDSSTT is
               COMPUTE, the third input value will be mapped to the fourth
               data source in the RRRRDD and so on). This is not very error
               resistant, as you might be sending the wrong data into an RRD.

               The template switch allows you to specify which data sources
               you are going to update and in which order. If the data sources
               specified in the template are not available in the RRD file,
               the update process will abort with an error message.

               While it appears possible with the template switch to update
               data sources asynchronously, RRRRDDttooooll implicitly assigns non-
               COMPUTE data sources missing from the template the _*_U_N_K_N_O_W_N_*
               value.

               Do not specify a value for a COMPUTE DDSSTT in the uuppddaattee
               function. If this is done accidentally (and this can only be
               done using the template switch), RRRRDDttooooll will ignore the value
               specified for the COMPUTE DDSSTT.

       NN|_t_i_m_e_s_t_a_m_p::_v_a_l_u_e[::_v_a_l_u_e...]
               The data used for updating the RRD was acquired at a certain
               time. This time can either be defined in seconds since
               1970-01-01 or by using the letter 'N', in which case the update
               time is set to be the current time. Negative time values are
               subtracted from the current time. An AT_STYLE TIME
               SPECIFICATION (see the _r_r_d_f_e_t_c_h documentation) may also be used
               by delimiting the end of the time specification with the '@'
               character instead of a ':'. Getting the timing right to the
               second is especially important when you are working with data-
               sources of type CCOOUUNNTTEERR, DDEERRIIVVEE or AABBSSOOLLUUTTEE.

               When using negative time values, options and data have to be
               separated by two dashes (----), else the time value would be
               parsed as an option.  See below for an example.

               The remaining elements of the argument are DS updates. The
               order of this list is the same as the order the data sources
               were defined in the RRA. If there is no data for a certain
               data-source, the letter UU (e.g., N:0.1:U:1) can be specified.

               The format of the value acquired from the data source is
               dependent on the data source type chosen. Normally it will be
               numeric, but the data acquisition modules may impose their very
               own parsing of this parameter as long as the colon (::) remains
               the data source value separator.

EEXXAAMMPPLLEE
       "rrdtool update demo1.rrd N:3.44:3.15:U:23"

       Update the database file demo1.rrd with 3 known and one _*_U_N_K_N_O_W_N_*
       value. Use the current time as the update time.

       "rrdtool update demo2.rrd 887457267:U 887457521:22 887457903:2.7"

       Update the database file demo2.rrd which expects data from a single
       data-source, three times. First with an _*_U_N_K_N_O_W_N_* value then with two
       regular readings. The update interval seems to be around 300 seconds.

       "rrdtool update demo3.rrd -- -5:21 N:42"

       Update the database file demo3.rrd two times, using five seconds in the
       past and the current time as the update times.

AAUUTTHHOORR
       Tobias Oetiker <tobi@oetiker.ch>



1.3.9                             2009-06-02                      RRDUPDATE(1)
