versions used BerkleyDB • Since 12.1, uses Oracle (multitenant) -MGMTDB • CDB runs on one node • Automatically relocated on node stop/failure • Default storage target is OCR/Voting disk • Diagnostic data saved in partitions • Size of GIMR is related to number of targets & retention • Database size remains fixed
• Real-time performance data • Cluster Health Monitor (CHM) • Metrics, fault, and diagnostic collections • Oracle Clusterware (GI logging) • Events for all Clusterware resources • Quality of Service Management (QoS) • Workload performance data
GIMR must be deployed to a separate ORACLE_HOME • During new install or upgrade of Grid Infrastructure • Centralized remote GIMR support • Many clusters, one GIMR • Separates data store, targets • Local mode for Cluster Health Monitor • Run oclumon dumpnodeview without GIMR • Gathers limited OS metrics for individual nodes
unaffected if GIMR fails • GIMR clients cache metrics locally during failures • Uses ~376 hugepages (when available) • Patches included in GI RUs • No separate patching is required • No backups required • Archive data with oclumon utility
& PDB name are protected • Prevents access by DBCA, DBUA, and similar tools • Only MGMTCA and utilities can manage GIMR • What resources does GIMR use? First 5 Targets Additional Targets 12.1 5.2G 500M each 12.2 36G 4.7G each 19c 28G 5G each
nodes automatically once a RAC DB starts • Reads Cluster Health Monitor data directly from memory • RAC, RAC One Node monitoring must be explicitly enabled • Reads Database ASH from SMR (no DB connection) • Data point collection • 150+ signals every second per target • Data is synchronized, smoothed • Results aggregated to 5 second intervals
drop GIMR! • OSS requires Tier One clusters 12c+ to run GIMR Connect to MGMTDB through SQL*Plus! • “Contains no user serviceable parts” • Only under direction of OSS Manage passwords manually! • Credentials automatically generated and managed • Use mgmtca to regenerate, do not set via SQL*Plus/clients
or MGMTLSNR as EMCC targets! • DB and listener automatically monitored by CRS • EMCC will treat MGMT* as SI targets Use srvctl modify mgmtdb|mgmtlsnr! • Use mgmtca to set/correct password/connection issues • Use mbdutil.pl script to: • Add or recreate MGMTDB • Move data files
disk group • External redundancy is adequate • Use mdbutil.pl to change storage location Maintain at least 72 hour retention for clients Check retention and set size: • oclumon manage -repos checkretentiontime 86400 • oclumon manage -repos changereposize <Size MB>
against models • Default models are conservative • Models “learn” over time • Calibration allows: • Accelerated learning • Multiple model profiles • Define KPI • Only one active/monitored model per target
can be combined • Set performance goals for training • They are not thresholds! Multiple models can exist for a target chactl calibrate [-cluster | -db <db_unqname>] [-model <model name>] [-force] [-timeranges 'start=<time>,end=<time>'] [-kpiset 'name=<kpi> min=<minval> max=<maxval>, ...'] Available KPI Names: • CPUPERCENT • IOREAD • IOWRITE • IOTHROUGHPUT • DBTIMEPERCALL (DB only)
Daytime, nighttime, month-end • Each model requires GIMR space • May need to increase size of repository, number of targets “No sufficient calibration data exists…” error • Increase or change the time period • Change KPI (if specified used) • Allow CHA to collect more data
detailed • KPI sets: Identical to chactl calibrate • Do not have to match the model • Use to filter results • May be combined chactl query calibration [-cluster | -db <db_unqname>] [-interval <hours>] [-timeranges ‘start=<time>,end=<time>'] [-kpiset 'name=<kpi> min=<minval> max=<maxval>, ...']
no time range = all target data • YYYY-MM-DD HH24:MI:SS Larger intervals typically run faster Queries may take 30-60 minutes • Run with nohup Output is lengthy • Redirect output to a file $ chactl query calibration -cluster \ -timeranges 'start=2020-08-21 00:00:00,end=2020-08-21 12:00:00' \ -interval 6 Cluster name : prod01db01 Data Start time : 2020-08-21 00:00:00 Data End time : 2020-08-21 06:00:00 Total Samples : 4321 Percentage of filtered data : 0.0% 1) CPU utilization (total) (%) MEAN MEDIAN STDDEV MIN MAX 27.70 24.60 11.41 8.80 72.10 <14.40 <23.90 <33.40 <42.90 <52.40 >=52.40 5.00% 41.10% 29.92% 11.39% 7.57% 5.02% Cluster name : npx01dbc01 Data Start time : 2020-08-21 06:00:00 Data End time : 2020-08-21 12:00:00 Total Samples : 4321 Percentage of filtered data : 0.0% 1) CPU utilization (total) (%) MEAN MEDIAN STDDEV MIN MAX 26.20 23.60 11.67 8.20 75.00 <13.00 <22.73 <32.45 <42.18 <51.90 >=51.90 4.77% 42.03% 30.50% 11.06% 6.60% 5.05%
is not configured MGMTLSNR is not configured # mdbutil.pl --addmdb --target=+DATA mdbutil.pl version : 1.99 Starting To Configure MGMTDB at +DATA... Container database creation in progress... Plugable database creation in progress... Executing "/tmp/mdbutil.pl --addchm" to configure CHM. MGMTDB & CHM configuration done!
mdbutil.pl version : 1.99 Moving MGMTDB, it will be stopped, are you sure (Y/N)? y Checking for the required paths under +DATA ... Stopping mgmtdb Copying MGMTDB DBFiles to +DATA Creating the CTRL File The CTRL File has been created and MGMTDB is now running from +DATA Modifying the init parameter Removing old MGMTDB Restarting MGMTDB using target SPFile MGMTDB Successfully moved to +DATA!
used BerkleyDB for its repository • Files could grow > 100G • Remove old/obsolete files: • rm $GRID_HOME/crf/dbf/$(hostname)/*.bdb • Could be on any node
files prefixed with -MGMTDB • *nix tries to interpret - as a command flag/option • Use ./ to manage files # less -MGMTDB_mmon_1277.trc Unknown option argument "-MGMTDB_mmon_1277.trc" # less ./-MGMTDB_mmon_1277.trc # rm ./-MGMTDB_mmon_1277.trc etc.
use OS authentication to connect to MGMTDB but Oracle advises against this! There is no reason to access MGMTDB under normal conditions! export ORACLE_SID=\-MGMTDB sqlplus / as sysdba
monitoring chactl monitor database -db <db_unqname> [-model <model name>] chactl unmonitor database -db <db_unqname> # Gather query repository chactl query repository # Change KEEP retention, repo size chactl set maxretention -time <hours_to_keep> chactl resize repository -entities <total_targets> # Start CHA srvctl start cha [-node <node>] # Stop CHA srvctl stop cha [-node <node>] [-force] # Show status and configuration srvctl status cha srvctl config cha chactl status [-verbose] # Show GIMR DB status srvctl status mgmtdb [-verbose]
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