prometheus_oracle_exporter

Prometheus Oracle Exporter

A Prometheus exporter for Oracle.

The following metrics are exposed currently. Support for RAC (databasename and instancename added via lables)

• oracledb_exporter_last_scrape_duration_seconds
• oracledb_exporter_last_scrape_error
• oracledb_exporter_scrapes_total
• oracledb_uptime (days)
• oracledb_session (view v$session system/user active/passive)
• oracledb_sysmetric (view v$sysmetric (Physical Read Total IO Requests Per Sec / Physical Write Total IO Requests Per Sec Physical Read Total Bytes Per Sec / Physical Write Total Bytes Per Sec))
• oracledb_sysstat (view v$sysstat (parse count (total) / execute count / user commits / user rollbacks))
• oracledb_waitclass (view v$waitclass)
• oracledb_tablespace (tablespace total/free)
• oracledb_asmspace (Space in ASM (v$asm_disk/v$asm_diskgroup))
• oracledb_interconnect (view v$sysstat (gc cr blocks served / gc cr blocks flushed / gc cr blocks received))
• oracledb_redo (Redo log switches over last 5 min from v$log_history)
• oracledb_cachehitratio (Cache hit ratios (v$sysmetric)
• oracledb_up (Whether the Oracle server is up)
• oracledb_error (Errors parsed from the alert.log)
• oracledb_error_unix_seconds (Last modified Date of alert.log in Unixtime)
• oracledb_services (Active Oracle Services (v$active_services))
• oracledb_parameter (Configuration Parameters (v$parameter))

*TOOK VERY LONG, BE CAREFUL (Put the Metrics below in a separate Scrape-Config):

• oracledb_tablerows (Number of Rows in Tables)
• oracledb_tablebytes (Bytes used by Table)
• oracledb_indexbytes (Bytes used by Indexes of associated Table)
• oracledb_lobbytes (Bytes used by Lobs of associated Table)
• oracledb_recovery (percentage usage in FRA from V$RECOVERY_FILE_DEST)

The Oracle Alertlog file is scanned and the metrics are exposed as a gauge metric with a total occurence of the specific ORA. You can define your own Queries and execute/scrape them

Installation

Ensure that the configfile (oracle.conf) is set correctly before starting. You can add multiple instances, e.g. the ASM instance. It is even possible to run one Exporter for all your Databases, but this is not recommended. We use it in our Company because on one host multiple Instances are running.

Custom metrics:

You can add custom queries in config file for scraping (see field queries in example). The query identifier is name parameter. For each query you define columns for metrics (metrics parameter) and columns for labels (labels parameter).

Limitations:

1. If two queries contains different columns in metrics or labels parameter, then you need use different name for this queries (through the entire config file).
2. Mandatory params: metrics, name, help
3. Parameter labels is optional
4. Columns defined in labels parameter should be CHAR, VARCHAR or NUMBER type.
5. Columns defined in metrics parameter should be NUMBER type.

Each defined query will provide a set of Prometheus metrics with a name oracledb_custom_<query_name> for every column defined in metrics parameter and for every row in query result. Column defined in metrics will appear in metric label.

Example:

queries:
 - sql: "select 1 as column1, 2 as column2, 3 as label_column from dual"
   name: sample1
   help: "This is my metric number 1"
   metrics:
    - column1
    - column2
   labels:
    - label_column

If this query returns two rows then exporter will provide such set of metrics:

# HELP oracledb_custom_sample1 This is my metric number 1
# TYPE oracledb_custom_sample1 gauge
oracledb_custom_sample1{database="mydb",dbinstance="mydb",metric="column1",label_column="some value 1",rownum="1"} 3.14
oracledb_custom_sample1{database="mydb",dbinstance="mydb",metric="column1",label_column="some value 2",rownum="2"} 6.28
oracledb_custom_sample1{database="mydb",dbinstance="mydb",metric="column2",label_column="some value 1",rownum="1"} 1
oracledb_custom_sample1{database="mydb",dbinstance="mydb",metric="column2",label_column="some value 2",rownum="2"} 2

Note: With option -norownum the label rownum is omitted, as this can vary over time and without explicit sorts.

Prometheus Configuration

scrape_configs:
  - job_name: 'oracle-short'
    metrics_path: /metrics
    static_configs:
      - targets:
        - oracle.host.com:9161
    relabel_configs:
     - source_labels: ['__address__']
       target_label: instance
       regex:  '(.*):\d+'
       replacement: "${1}"

  - job_name: 'oracle-tab'
    scrape_interval: 6h
    scrape_timeout: 120s
    metrics_path: /metrics
    params:
      tablerows: [true]
      lobbytes: [true]
      recovery: [true]
    static_configs:
      - targets:
         - oracle.host.com:9161
    relabel_configs:
     - source_labels: ['__address__']
       target_label: instance
       regex:  '(.*):\d+'
       replacement: "${1}"

  - job_name: 'oracle-ind'
    scrape_interval: 6h
    scrape_timeout: 120s
    metrics_path: /metrics
    params:
      tablebytes: [true]
      indexbytes: [true]
      recovery: [true]
    static_configs:
      - targets:
         - oracle.host.com:9161
    relabel_configs:
     - source_labels: ['__address__']
       target_label: instance
       regex:  '(.*):\d+'
       replacement: "${1}"

export NLS_LANG=AMERICAN_AMERICA.UTF8
/path/to/binary -configfile=/home/user/oracle.conf -web.listen-address :9161

Usage

Usage of ./prometheus_oracle_exporter:
  -accessfile string
    Last access for parsed Oracle Alerts. (default "access.conf")
  -configfile string
    ConfigurationFile in YAML format. (default "oracle.conf")
  -defaultmetrics
    Expose standard metrics (default true)
  -indexbytes
    Expose Index size for any Table (CAN TAKE VERY LONG)
  -lobbytes
    Expose Lobs size for any Table (CAN TAKE VERY LONG)
  -logfile string
    Logfile for parsed Oracle Alerts. (default "exporter.log")
  -norownum
    supress rownum label in custom metrics
  -recovery
    Expose Recovery percentage usage of FRA (CAN TAKE VERY LONG)
  -tablebytes
    Expose Table size (CAN TAKE VERY LONG)
  -tablerows
    Expose Table rows (CAN TAKE VERY LONG)
  -web.listen-address string
    Address to listen on for web interface and telemetry. (default ":9161")
  -web.telemetry-path string
    Path under which to expose metrics. (default "/metrics")
  -winsvc string
    install, uninstall, start, stop a Windows service

Windows Service

The binary can be installed as a Windows service by supplying the -winsvc install arg. All other arguments passed along with -winsvc install will be added to the service startup and can only be changed by uninstalling/installing it again (or modifying the Windows registry directly).

Note: the path to the DDLs of the oracle client or instant client must be in the system PATH for exectution.

Grafana

In The folder Grafana are examples of my used Dashboards

Overview

Tablespace

Transfers

Transfers RAC

Errors

Compilation

The go compilation is not straight forward, as the go oracle package installation needs additional software and configuration.

Compilation of mattn/go-oci8 on Linux

go get github.com/mattn/go-oci8

download and extract oracle client or instant client (not light!), e.g:

• instantclient-basic-linux.x64-19.8.0.0.0dbru.zip
• instantclient-sdk-linux.x64-19.8.0.0.0dbru.zip

Edit $GOPATH/src/github.com/mattn/go-oci8/oci8.cp to set the paths to your oracle

Compilation on Windows

Thanks to https://gist.github.com/mnadel/8678269 for howto compile go-oci8 on windows!

install go e.g 1.15.4

install tdm gcc from https://github.com/jmeubank/tdm-gcc/releases/download/v9.2.0-tdm64-1/tdm64-gcc-9.2.0.exe

and add it to the path

set PATH=%PATH%;D:\go\bin;D:\TDM-GCC-64\bin

download and extract oracle client or instant client (not light!), e.g:

• instantclient-basic-windows.x64-19.8.0.0.0dbru.zip
• instantclient-sdk-windows.x64-19.8.0.0.0dbru.zip

install pkc-config lite https://sourceforge.net/projects/pkgconfiglite/files/0.28-1/pkg-config-lite-0.28-1_bin-win32.zip/download

 go get github.com/mattn/go-oci8

build fails due to missing go-oci8 config:

edit oci8.cp set paths to Oracle instant client

set PKG_CONFIG_PATH=%cd%
copy %GOPATH%\src\github.com\mattn\go-oci8\oci8.cp .

And edit file.

If there are still header problems with pkg_config additionally set:

set CGO_LDFLAGS=-L D:/oracle_instantclient_19_8/sdk/lib/msvc -loci
set CGO_CFLAGS=-I D:/oracle_instantclient_19_8/sdk/include

go get github.com/ulikl/prometheus_oracle_exporter