checks/postgres_bloat

   1 #!/usr/bin/python
   2 # -*- encoding: utf-8; py-indent-offset: 4 -*-
   3 # +------------------------------------------------------------------+
   4 # |             ____ _               _        __  __ _  __           |
   5 # |            / ___| |__   ___  ___| | __   |  \/  | |/ /           |
   6 # |           | |   | '_ \ / _ \/ __| |/ /   | |\/| | ' /            |
   7 # |           | |___| | | |  __/ (__|   <    | |  | | . \            |
   8 # |            \____|_| |_|\___|\___|_|\_\___|_|  |_|_|\_\           |
   9 # |                                                                  |
  10 # | Copyright Mathias Kettner 2014             mk@mathias-kettner.de |
  11 # +------------------------------------------------------------------+
  12 #
  13 # This file is part of Check_MK.
  14 # The official homepage is at http://mathias-kettner.de/check_mk.
  15 #
  16 # check_mk is free software;  you can redistribute it and/or modify it
  17 # under the  terms of the  GNU General Public License  as published by
  18 # the Free Software Foundation in version 2.  check_mk is  distributed
  19 # in the hope that it will be useful, but WITHOUT ANY WARRANTY;  with-
  20 # out even the implied warranty of  MERCHANTABILITY  or  FITNESS FOR A
  21 # PARTICULAR PURPOSE. See the  GNU General Public License for more de-
  22 # tails. You should have  received  a copy of the  GNU  General Public
  23 # License along with GNU Make; see the file  COPYING.  If  not,  write
  24 # to the Free Software Foundation, Inc., 51 Franklin St,  Fifth Floor,
  25 # Boston, MA 02110-1301 USA.
  26
  27 # <<<postgres_bloat>>>
  28 # [databases_start]
  29 # postgres
  30 # testdb
  31 # datenbank
  32 # [databases_end]
  33 # db;schemaname;tablename;tups;pages;otta;tbloat;wastedpages;wastedbytes;wastedsize;iname;itups;ipages;iotta;ibloat;wastedipages;wastedibytes;wastedisize;totalwastedbytes
  34 # postgres;pg_catalog;pg_amop;403;4;3;1.3;1;8192;8192;pg_amop_oid_index;403;4;2;2.0;2;16384;16384;24576
  35 # postgres;pg_catalog;pg_amproc;291;3;2;1.5;1;8192;8192;pg_amproc_fam_proc_index;291;4;2;2.0;2;16384;16384;24576
  36 # postgres;pg_catalog;pg_amop;403;4;3;1.3;1;8192;8192;pg_amop_opr_fam_index;403;4;2;2.0;2;16384;16384;24576
  37
  38 # instances
  39 # <<<postgres_bloat>>>
  40 # [[[foobar]]]
  41 # [databases_start]
  42 # postgres
  43 # testdb
  44 # [databases_end]
  45 # ...
  46
  47 factory_settings["postgres_bloat_default_levels"] = {
  48     'table_bloat_perc': (180.0, 200.0),  # WARN at 180%, CRIT at 200%
  49     'index_bloat_perc': (180.0, 200.0)
  50 }
  51
  52
  53 def inventory_postgres_bloat(parsed):
  54     return [(entry, {}) for entry, values in parsed.items() if values]
  55
  56
  57 def check_postgres_bloat(item, params, parsed):
  58     database = parsed.get(item)
  59     if not database:
  60         # In case of missing information we assume that the login into
  61         # the database has failed and we simply skip this check. It won't
  62         # switch to UNKNOWN, but will get stale.
  63         raise MKCounterWrapped("Login into database failed")
  64
  65     table_perc_max = None
  66     table_abs_max = None
  67     index_perc_max = None
  68     index_abs_max = None
  69
  70     table_abs_total = 0
  71     index_abs_total = 0
  72
  73     show_levels = False
  74     for line in database:
  75         tbloat = float(line["tbloat"])
  76         twasted = int(line["wastedbytes"])
  77         ibloat = float(line["ibloat"])
  78         iwasted = int(line["wastedibytes"])
  79
  80         table_abs_total += twasted
  81         index_abs_total += iwasted
  82
  83         # Calculate highest loss
  84         if not table_perc_max or tbloat > float(table_perc_max["tbloat"]):
  85             table_perc_max = line
  86         if not table_abs_max or twasted > int(table_abs_max["wastedbytes"]):
  87             table_abs_max = line
  88         if not index_perc_max or ibloat > float(index_perc_max["ibloat"]):
  89             index_perc_max = line
  90         if not index_abs_max or iwasted > int(index_abs_max["wastedibytes"]):
  91             index_abs_max = line
  92
  93         for what, bloat, wasted in [("table", tbloat, twasted), ("index", ibloat, iwasted)]:
  94             if "%s_bloat_perc" % what in params:
  95                 warn, crit = params["%s_bloat_perc" % what]
  96                 if bloat >= crit:
  97                     yield 2, "%s %s bloat: %s%% (too high)" % (line["tablename"], what, bloat)
  98                     show_levels = True
  99                 elif bloat >= warn:
 100                     yield 1, "%s %s bloat: %s%% (too high)" % (line["tablename"], what, bloat)
 101                     show_levels = True
 102
 103             if "%s_bloat_abs" % what in params:
 104                 warn, crit = params["%s_bloat_abs" % what]
 105                 if wasted >= crit:
 106                     yield 2, "%s wasted %s bytes: %s (too high)" % (
 107                         line["tablename"], what, get_bytes_human_readable(wasted))
 108                     show_levels = True
 109                 elif wasted >= warn:
 110                     yield 1, "%s wasted %s bytes: %s (too high)" % (
 111                         line["tablename"], what, get_bytes_human_readable(wasted))
 112                     show_levels = True
 113
 114     if show_levels:
 115         levels_info = ["Levels:"]
 116         for what in ["table", "index"]:
 117             if "%s_bloat_perc" % what in params:
 118                 levels_info.append(
 119                     "%s Perc (%.0f%%/%.0f%%)" % ((what.title(),) + params["%s_bloat_perc" % what]))
 120             if "%s_bloat_abs" % what in params:
 121                 levels_info.append("%s Abs (%s/%s)" % ((what.title(),) + \
 122                     tuple(get_bytes_human_readable(int(x)) for x in params["%s_bloat_abs" % what])))
 123         yield 0, " ".join(levels_info)
 124     else:
 125         # No errors. Show some general information
 126         for what, perc_max, abs_max in [("table", table_perc_max, table_abs_max),
 127                                         ("index", index_perc_max, index_abs_max)]:
 128             yield 0, "Maximum %s bloat at %s: %d%%" % (what, perc_max["tablename"],
 129                                                        float(perc_max["%sbloat" % what[0]]) * 100)
 130             yield 0, "Maximum wasted %sspace at %s: %s" % (
 131                 what, abs_max["tablename"],
 132                 get_bytes_human_readable(
 133                     int(abs_max["wasted%sbytes" % (what == "index" and "i" or "")])))
 134
 135     # Summary information
 136     for what, total_value in [("table", table_abs_total), ("index", index_abs_total)]:
 137         yield (
 138             0,
 139             "Summary of top %d wasted %sspace: %s" % (len(database), what,
 140                                                       get_bytes_human_readable(total_value)),
 141             [("%sspace_wasted" % what, total_value)],
 142         )
 143
 144
 145 check_info['postgres_bloat'] = {
 146     "parse_function": parse_postgres_dbs,
 147     "check_function": check_postgres_bloat,
 148     "inventory_function": inventory_postgres_bloat,
 149     "service_description": "PostgreSQL Bloat %s",
 150     "group": "db_bloat",
 151     "default_levels_variable": "postgres_bloat_default_levels",
 152     "has_perfdata": True,
 153     "includes": ["postgres.include"]
 154 }