Streams HC Webcast

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Streams Health Check Script Report: How to generate

and relevant interpretation hints

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Streams Health Check Script Report: How to

generate and relevant interpretation hints

Daniel de Julián

Senior Principal Technical Support Engineer

5

AGENDA

• What is the Streams HC script?

• Run and modify Streams HC

• Navigating on Streams HC report

• Streams HC Report – Generic

• Streams HC Report – Capture Site

• Streams HC Report – Apply Site

• Q&A


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What is Streams Health Check Script?

• Streams Health Check Script is a sql file that contains

a set of queries and anonymous blocks that obtain

current information about Streams components in the

database where it is executed.

• Streams HC does not alter or changes Streams

configuration.

• Streams HC script can be downloaded from My

Oracle Support Doc ID 273674.1

• There is one specific Streams HC for every specific

release.

• Streams HC execution generates an html file that can

be reviewed with a browser. Assure to spool the

execution.


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Run and Modify Streams HC

• Initially Streams HC should be run on all databases

conforming streams environment.

• The Streams HC output can be used to review the

current situation or to check how the Streams is

flowing by comparing different reports.

• As it is sql file, you can check the contents of the

script and if required customize to adjust your

configuration needs.

• There are some sections/queries that can return a

large amount of rows, they can be commented out if

required.

• By default it is executed as sysdba as it checks some

memory structures.


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Navigating on Streams HC report


• First information to check is about the report itself

• Links are generated in the report for a fast navigation.

• Links are grouped in three groups:

• Configuration, where we you see definitions or static

information.

• Analysis, where you can see the results of checks that scripts

run and some historical information.

• Statistics, where you can check the statistics for processes

that are currently up.

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Streams HC Report - Generic

Configuration

• Database, includes sections about database, instances, NLS

database settings, key init.ora parameters…..

• Queue, allow you to check which is the owner instance (in the case

this is a RAC).

Statistics

• Queue, provides information about the number of messages in the

queue and if they have been spilled.


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Streams HC Report - Generic

Analysis

• Notifications, will put a message if there is any issue that may

avoid that Streams flows properly.

• Configuration, will warn if there is any wrong configuration

and perform some configuration suggestions that may

improve performance.

• Performance, will write a message if performance threshold

have been exceeded.

• Wait Analysis, will show, per streams component process

started, the wait percentage on a specific wait event. The

scope of percentage is limited to last 30 minutes. Only

process started will be listed.


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Streams HC – Capture site - Configuration

• Section “Minimum Archive Log Necessary to Restart

Capture” will help to identify the achievers that can

not be deleted.

• Applied SCN is the lowest scn of all apply sites.

• If there is a significant difference between “Applied

SCN” and “Last Enqueued SCN”, then there is a

problem at any apply site.

• Using capture_scn and information at “Registered Log

Files for Capture” section will help to identify how

many achievers still need to be mined.

• For downstream environments assure that source site

archivers are visible on “Registered Log Files for

Capture” section.


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Streams HC – Capture site - Statistics

• Replication between 11g databases should have

CCA enabled.

• Buffered publishers sections allows to monitor how

many messages have been enqueued per CP

process.

• Open Streams Capture transactions is used to

monitor potential large/long running transactions.

• Propagation has two faces “Sender” on Capture site

and “Receiver” on Receiving site.

• It is expected to see a buffered propagation and a

persistent propagation per propagation enabled.

• Persistent propagation should have all statistics to 0.


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Streams HC – Apply site - Configuration

• On “Apply Tag” column you can verify if the tag that is

being used is correct.

• In this section you can also verify positive and

negative rulesets used by apply. You should consider

removing the positive ruleset if the apply will

unconditionally apply all the changes that receive.

• The column applied_message_number on “Apply

progress” section, is the source scn of last message

that has been effectively applied or apply spilled.

• Propagation configuration is only applicable on

sending site, not receiving site.


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Streams HC – Apply site - Statistics

• There are separate statistics for propagation receiver,

apply reader, apply coordinator and apply server.

• It is not desirable to see entries on “Apply spilled

transactions” at apply reader statistics section. If so,

an action must be executed to avoid them.

• On apply server statistics, we can see the waits that

every apply server has had and what is the current

transaction that the apply server is applying.

• Open Streams Apply Transactions, lists the

transactions that all apply processes are managing.

• The apply error queue lists failed transactions in the

order that they must be solved to avoid snowballs.



THANK YOU

Streams HC Webcast

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