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Consolidating Databases
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Meeting and Exceeding SLAs
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Once the calculations have been made on how many databases can be consolidated onto a Oracle Exadata Database Machine, the next step is to ensure that for each database, SLAs are met or exceeded A single database on a single Oracle Exadata Database Machine doesn t need to share anything except potentially the same InfiniBand network for the RAC interconnect and I/O traffic However, as more databases are consolidated onto the same Oracle Exadata Database Machine, then I/O, memory, and CPU need to be shared if applications access these databases concurrently Any resourceintensive database can significantly degrade the performance of the other databases unless steps are taken to enable resource management and isolation A number of techniques can be used to ensure SLAs are met or exceeded, and they can be used individually or they can be combined
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Instance Caging
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Instance caging is the process by which a DBA can limit the physical cores that can be allocated to a database instance that runs on a particular database server This is achieved by using the CPU_COUNT database parameter and the Oracle Database Resource Manager, which limits the amount of CPU that a particular database instance consumes This technique is important from a consolidation perspective, because you do not want any particular database instance bringing a database server to its knees by using most of the CPU resources and affecting other database instances that might be running on that particular database server The upper limit of CPU_COUNT can be adjusted to ensure that each instance cannot expend database server CPU cores that it is not authorized to access Enabling instance caging is a two-step process 1 Set the value of CPU_COUNT This dynamic parameter should be set to the maximum number of CPU cores ( or logical hyperthread cores) that the database instance can utilize at any one time For example, to set the parameter to 32, you would use the following syntax:
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Alter system set cpu_count=32;
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2 Enable the Oracle Resource Manager plan The next step is to enable the Oracle Database Resource Manager plan that manages CPU Any resource plan such as DEFAULT_PLAN or DEFAULT_ MAINTENANCE_PLAN that uses CPU directives can be used Alternatively, you can create your own resource plan, as shown in an example later in this chapter The resource plan then needs to be enabled
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Alter system set resource_manager_plan = 'DEFAULT_ MAINENANCE_PLAN';
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Instance caging is now enabled How do you make sure that you are running correctly The following query can determine if the CPU_COUNT has been set correctly:
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Select value from v$parameter where name='cpu_count' and (isdefault='FALSE' or ismodified != 'FALSE');
This query should return the current value of CPU_COUNT if you have modified it; if you have not, it will return no rows Next, you need to determine if the right plan is active within the Database Resource Manager
Select name from v$rsrc_plan where cpu_managed='ON' and is_top_ plan='TRUE';
If a row is returned, then the plan is active Otherwise, either the Database Resource Manager is off or the Database Resource Manager is on but not managing the CPU Instance caging works by throttling database instance processes that require more CPUs than the instance is entitled to The wait event resmgr:cpu quantum may appear in the AWR reports if this throttling becomes significant, after which point it may become necessary to increase CPU_COUNT or add another database server node via RAC dynamic cluster expansion The v$rsrcmgrmetric_history view shows the amount of throttling and CPU consumption for each minute of the past hour From a consolidation perspective, there are two main methods of leveraging instance caging
Highest SLA Database Instances
Highest SLA database instances are critical to a business and need to run without any adverse CPU effects from any other database instances that
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