|Exam Name||:||Oracle Database 10g R2: Administering RAC|
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|Updated On||:||February 15, 2019|
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hi, I ought to migrate from Oracle 8.0.6 to Oracle 10g R2. I actually have loads of doubts, as a result of this can be the primary time i will be able to do this. I took practicing to turn into a DBA in Oracle 9i. i want to understand the steps that I have to take to do the migration. Do I migrate first from Oracle eight to Oracle 9i and then from Oracle 9i to Oracle 10g? Please, may you supply me some concepts or the steps to comply with to do that? Thanks to your help. Oracle 8 resides on Solaris 5.7 and we wish to flow to Solaris 10.
Migrating a database from Oracle eight.0.6 to 10gR2 is a giant step. There were many enhancements made within the Oracle software and there will likely be some tuning associated with this migration. There are a couple of the right way to migrate your database however whatever thing system you opt for, be certain to include sufficient time for checking out the migration a couple of times in a non-creation ambiance. This includes testing the migration, in addition to software and functional testing by way of your utility and business aid teams. checking out isn't wasted!
a good supply of tips is the Oracle Database 10g unencumber 2 (10.2) improve e book. there's a bit in this book titled "investigate the improve route to the new Oracle Database 10g free up" which states that in case you are looking to improve your database in vicinity, you need to go from eight.0.6 to eight.1.7.four and then to 10.2. Your different alternatives are to make use of export and import from the current 8.0.6 database to a newly created 10.2 database, or to replica the records the usage of a database link. The improve ebook explains each and every of those ideas, but you have to select the formulation you are most comfortable with and that matches within your migration strategy.
REDWOOD SHORES, Calif., can also 15 /PRNewswire-FirstCall/ -- Oracle today announced a listing breaking TPC-H Three Terabyte (TB) benchmark for a database running on the windows working device, demonstrating the superior performance of Oracle(R) Database 10g free up 2 working on Microsoft home windows and an HP Integrity Superdome Server.(1) With this newest fulfillment, Oracle now holds nine of the proper 10 efficiency world list benchmark effects for the TPC-H 3TB scale component.(2)
(brand: http://www.newscom.com/cgi-bin/prnh/20020718/ORCLLOGO )
working on an HP Integrity Superdome Server with sixteen dual-core Intel Itanium processors on the windows operating device, Oracle Database 10g liberate 2 carried out a list-breaking efficiency of 37,813.7 [email protected] with a value-efficiency ratio of $38.00/[email protected] surroundings the quickest results for a windows-primarily based gadget with the TPC-H 3TB benchmark, Oracle's outcomes outperformed the outdated top-rated efficiency outcome through a competitor on windows in both performance and value.(3)
"This benchmark solidifies Oracle's world-type recognition because the database performance leader and is a testament to our endured commitment to the windows platform," spoke of Juan Loaiza, senior vp, programs technology, Oracle. "setting the new TPC-H three Terabyte list for fastest windows-primarily based device is a vital proof factor and further validates why clients rely on the excessive efficiency capabilities of Oracle Database 10g."
because the leading database for statistics warehousing methods, Oracle Database 10g gives a single, integrated database engine for scalable and excessive performing database functions. building on its background of excellence, Oracle holds world information within the TPC-H 300GB(4), TPC-H One TB(5), TPC-H Three TB(6) and TPC-H non-clustered 10 TB(7) scale component classes.
About Oracle Database 10g
The handiest database designed for grid computing, Oracle Database 10g can provide sophisticated efficiency, scalability, availability, protection and ease of administration on a reasonably priced grid of industry typical storage and servers. Oracle Database 10g is designed to be effectively deployed on everything from small blade servers to the greatest SMP servers and clusters of all sizes. It points automatic administration capabilities for easy, cost-efficient operation.
Oracle Database 10g's pleasing capability to control statistics from average company tips to XML files and spatial/vicinity information makes it the surest choice to vigor online transaction processing, choice assist and content administration applications.
TPC-H is a choice support benchmark which includes a set of company oriented ad-hoc queries and concurrent statistics adjustments. The efficiency metric is called the TPC-H Composite query-per-Hour performance Metric ([email protected]) and reflects multiple features of the means of the gadget to technique queries. greater information is obtainable at http://www.tpc.org/.
Oracle is the realm's largest commercial enterprise software company. For greater counsel about Oracle, talk over with our web website at http://www.oracle.com/.
Oracle is a registered trademark of Oracle corporation and/or its associates. other names may well be logos of their respective homeowners.
TPC-H, QphH, $/QphH are logos of the Transaction Processing performance Council (TPC).
As of may also 14, 2007: supply: Transaction Processing efficiency Council (TPC), http://www.tpc.org/
(1) HP Integrity Superdome Server, sixteen processors/32 cores/32 threads, Oracle Database 10g free up 2 business version, 37,[email protected], $38.00/[email protected], attainable 5/14/07 (premier TPC-H 3TB influence on windows).
(2) To view the right Ten TPC-H by way of performance outcomes, please visit: http://www.tpc.org/tpch/effects/tpch_perf_results.asp
(3) HP Integrity Superdome Server, 32 processors/32 cores, Microsoft SQL Server 2005 business edition, 30,956.6 [email protected], $seventy five.16/[email protected], attainable 5/5/06 (old finest TPC-H 3TB performance influence via a competitor on home windows).
(4) HP BladeSystem ProLiant BL480c, 16 processors/32 cores/32 threads, forty,411 [email protected], Oracle Database 10g unlock 2 commercial enterprise edition, $18.67/[email protected], purchasable 12/18/06 (TPC-H 300GB World list performance effect).
(5) HP Integrity Superdome Server, sixty four processors/64 cores/sixty four threads, Oracle Database 10g free up 2 enterprise edition, sixty eight,100/[email protected], $59/[email protected], purchasable 1/18/06 (TPC-H 1000GB World record efficiency result).
(6) sun hearth E25K Server, 72 processors/one hundred forty four cores/one hundred forty four threads, Oracle Database 10g unlock 2 commercial enterprise version, 114,713 [email protected], $36.sixty eight/[email protected], accessible four/9/07 (TPC-H 3000GB World list efficiency outcome).
(7) HP Integrity Superdome Server, sixty four processors/128 cores/128 threads, Oracle Database 10g release 2 commercial enterprise version, 171,380 [email protected], $32.ninety one/[email protected], accessible four/1/07 (TPC-H 10000GB Non-Clustered World record performance result).Oracle business enterprise
CONTACT: Teri Whitaker, +1-650-506-9914, [email protected], orLetty Ledbetter, +1-650-506-8071, [email protected], both of Oracle
net site: http://www.oracle.com/
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Log directory structure in Oracle RDBMS
In a 10g RAC installation, a node consists of a CRS home and an Oracle RDBMS home. The RDBMS home is where you install the Oracle software with the RAC option. You create databases from this home. The log files are related to each of the database instances running out of this Oracle home. The most important log file that every database generates is the alert.log file that is created in the directory specified by the init.ora parameter background_dump_dest. For most sites, this directory is kept under $ORACLE_BASE/admin.
Suppose, for example, that you have a database named test. All its background process trace files, along with the alert.log, would be available in the $ORACLE_BASE/admin/test/bdump directory; that's the norm. Its not a hard and fast rule that you use this directory structure, but it does help to follow conventions.
These directories are also important for the RDBMS home:
Let's take a closer look at the startup of an instance in a two-node RAC cluster running version 10.1.0.4. We use SQL *Plus to issue startup on node1 and then on node2. The sequence of events follows with additional explanations added as and when required:
SQL> startup nomount; Cluster communication is configured to use the following interface(s) for this instance 192.168.0.1 Mon Aug 29 07:25:09 2005 cluster interconnect IPC version:Oracle UDP/IP IPC Vendor 1 proto 2 Version 1.0 PMON started with pid=2, OS id=31242
The correct interconnect must be used for the Cache Fusion traffic. Some may choose the public network for the interconnect traffic, but doing so will bring the database to its knees. To identify the network used for Cache Fusion or private traffic, you can do any of the following:
$ oifcfg getif SQL> select INST_ID,PUB_KSXPIA,PICKED_KSXPIA,NAME_KSXPIA,IP_KSXPIA from x$ksxpia; INST_ID P PICK NAME_KSXPIA IP_KSXPIA ---------- - ---- --------------- ---------------- 1 OCR prod1 192.168.0.1
Depending on the source of the information, the PICKED_KSXPIA is populated with the values OSD, OCR, and CI. If the cluster_interconnects parameter is set in the SPFILE, the query will return the following output:
SQL> select INST_ID,PUB_KSXPIA,PICKED_KSXPIA,NAME_KSXPIA,IP_KSXPIA from x$ksxpia; INST_ID P PICK NAME_KSXPIA IP_KSXPIA ---------- - ---- --------------- ---------------- 1 CI prod1 192.168.0.1
Another option is the conventional method of finding the interconnect information from an Interprocess Communications (IPC) dump. This was the only method available in Oracle versions prior to 10g, but this method is also possible in Oracle 10g. Starting from 10g R2, X$KSXPIA is exposed as GV$CONFIGURED_INTERCONNECTS.
Log in to the database as user SYS:
SQL> oradebug setmypid SQL> oradebug ipc
This will dump a trace file to user_dump_dest. The output will look something like this:
SSKGXPT 0x1a2932c flags SSKGXPT_READPENDING info for network 0 socket no 10 IP 192.168.0.1 UDP 43749 sflags SSKGXPT_WRITESSKGXPT_UP info for network 1 socket no 0 IP 0.0.0.0 UDP 0...
You can see that we are using IP 192.168.0.1 with a User Datagram Protocol (UDP).
To change the network that RAC uses, you can change the order of the network(s) in the operating system–dependent network configurations, such as /etc/hosts or by using the cluster_interconnects parameter.
A little caution is required while using the cluster_ interconnects parameter. With Oracle 10g, interconnect information is stored in OCR, so you don't need to specify the interconnect using the cluster_interconnects parameter. Although this parameter supports load balancing among the specified interfaces, it does not provide failover capabilities, and in case one of several interfaces goes down, Oracle will treat it as a complete failure and start evicting instances. You can still use cluster_ interconnects with one IP address—for example, to work around a bug in the network selection or to use a specific NIC for a particular instance for test purposes.
The moment the first instance is started, its alert log gets populated with important information. The first thing to notice in the preceding example after the list of non-default parameters is the IP address used for the interconnect. On the first instance, mentioning the cluster_interconnects parameter is necessary so that the correct interface is picked up—due to a bug that doesn't pick up the correct interface for the interconnect. Also shown is the protocol used—in our case, UDP. The value shown would depend on your platform-specific usage—RSM could be used on Sun, HyperFabric on HP, and so on. Ensure that you see the correct protocol that you have configured for the interconnect usage. The supported interconnect protocols with respect to various operating systems are listed in Chapter 3.
Mon Aug 29 07:25:11 2005 lmon registered with NM - instance id 1 (internal mem no 0) Mon Aug 29 07:25:11 2005 Reconfiguration started (old inc 0, new inc 1) List of nodes: 0 Global Resource Directory frozen Update rdomain variables Communication channels reestablished Master broadcasted resource hash value bitmaps Non-local Process blocks cleaned out Mon Aug 29 07:25:11 2005 LMS 1: 0 GCS shadows cancelled, 0 closed Mon Aug 29 07:25:11 2005 LMS 0: 0 GCS shadows cancelled, 0 closed Set master node info Submitted all remote-enqueue requests Dwn-cvts replayed, VALBLKs dubious All grantable enqueues granted Post SMON to start 1st pass IR Mon Aug 29 07:25:11 2005 LMS 0: 0 GCS shadows traversed, 0 replayed Mon Aug 29 07:25:11 2005 LMS 1: 0 GCS shadows traversed, 0 replayed Mon Aug 29 07:25:11 2005 Submitted all GCS remote-cache requests Post SMON to start 1st pass IR Fix write in gcs resources Reconfiguration complete LCK0 started with pid=17, OS id=31272
When an instance starts up, it's the Lock Monitor's (LMON) job to register with the Node Monitor (NM). That's what we see in the alert.log with the instance ID that is getting registered. When any node joins or leaves a cluster, the global resource directory undergoes a reconfiguration event. We see the start of the reconfiguration event along with the old and new incarnation. Next, we see the number of nodes that have joined the cluster. As this was the first node to be started up, in the list of nodes we see only one node listed, and the number starts with 0. A reconfiguration event is a seven-step procedure and upon completion the "reconfiguration complete" message is logged into the alert.log.
The messages logged in the alert.log are summaries of the reconfiguration event. The LMON trace file would have more information about the reconfiguration. Following are the contents of the LMON trace file:
*** 2005-08-29 07:25:11.235 kjxgmrcfg: Reconfiguration started, reason 1 kjxgmcs: Setting state to 0 0.
Here, you can see the reason for the reconfiguration event. The most common reasons would be 1, 2, or 3. Reason 1 means that the NM initiated the reconfiguration event, as typically seen when a node joins or leaves a cluster. A reconfiguration event is initiated with reason 2 when an instance death is detected. How is an instance death detected? Every instance updates the control file with a heartbeat through its Checkpoint (CKPT) process. If heartbeat information is not present for x amount of time, the instance is considered to be dead and the Instance Membership Recovery (IMR) process initiates reconfiguration. This type of reconfiguration is commonly seen when significant time changes occur across nodes, the node is starved for CPU or I/O times, or some problems occur with the shared storage.
A reason 3 reconfiguration event is due to a communication failure. Communication channels are established between the Oracle processes across the nodes. This communication occurs over the interconnect. Every message sender expects an acknowledgment message from the receiver. If a message is not received for a timeout period, then a "communication failure" is assumed. This is more relevant for UDP, as Reliable Shared Memory (RSM), Reliable DataGram protocol (RDG), and Hyper Messaging Protocol (HMP) do not need it, since the acknowledgment mechanisms are built into the cluster communication and protocol itself.
When the block is sent from one instance to another using wire, especially when unreliable protocols such as UDP are used, it is best to get an acknowledgment message from the receiver. The acknowledgment is a simple side channel message that is normally required for most of the UNIX systems where UDP is used as the default IPC protocol. When user-mode IPC protocols such as RDG (on HP Tru64 UNIX TruCluster) or HP HMP are used, the additional messaging can be disabled by setting _reliable_block_sends=TRUE. For Windows-based systems, it is always recommended to leave the default value as is.
Database mounted in Shared Mode (CLUSTER_DATABASE=TRUE). Completed: alter database mount
Since this is an RAC database, every instance mounts the database in shared mode. Sometimes you want to mount the database in exclusive mode, as in completing the actions of a patch set application. Checking the alert log is one way to confirm that:
Mon Aug 29 15:36:53 2005 alter database open This instance was first to open Picked Lamport scheme to generate SCNs
You may see the message depending on the version of the RAC and setting of the parameter max_commit_propagation_delay. In version 9i, every commit System Commit Numbers (SCN) is broadcasted to all the nodes, and the log writer is held up until all the interested redos are written to the disk. Starting with 10g, the wait is greatly reduced as the broadcast and commit are asynchronous. This means the system waits until it is sure that all nodes have seen the commit SCN. Any message with an SCN greater than commit SCN is deemed sufficient.
Before doing a broadcast, the process checks whether it has already received a higher SCN from that instance. It used the same SCN to determine whether a foreground or an LMS has to be posted. With 10g, this is decoupled: an SCN to release foregrounds and an SCN needed for shipping buffers. The init.ora parameter _lgwr_async_broadcasts = true can be used to change the broadcast method.
Use the following table of contents to navigate to chapter excerpts or click here to view RAC Troubleshooting in its entirety.
Oracle Database 10g: Real Application Clusters Handbook
Home: Oracle RAC troubleshooting: Introduction 1: Oracle RAC: Log directory structure in cluster ready services 2:Oracle RAC: Log directory structure in Oracle RDBMS 3: Oracle RAC and the Lamport algorithm 4: Oracle RAC: ON and OFF 5: Oracle RAC: Database performance issues 6: Oracle RAC: Debugging node eviction issues 7: Oracle RAC: Member voting 8: Oracle RAC: Cluster reconfiguration steps 9: Oracle RAC: Debugging CRS and GSD using DTRACINGAbout the book: Oracle Database 10g: Real Applications Clusters Handbook Learn to implement Oracle real application clusters from the ground up. Maximize database availability, scalability, and efficiency. Find RAC concepts, administration, tuning, and troubleshooting information. You'll learn how to prepare and create Oracle RAC databases and servers, and automate administrative tasks. You'll also get full coverage of cutting-edge Oracle RAC diagnostic tools, backup and recovery procedures, performance tweaks and custom application design strategies. Buy this book atMcGraw-Hill/Osborne About the author: K Gopalakrishnan is a senior principal consultant with the Advanced Technology Services group at Oracle Corporation, specializing exclusively in performance tuning, high availability, and disaster recovery. He is a recognized expert in Oracle RAC and Database Internals and has used his extensive expertise in solving many vexing performance issues all across the world for telecom giants, banks, financial institutions, and universities.
The primary and standby databases must be running Oracle Database 10g (10.2) and each can be installed in either a single-instance or multi-instance environment. The database must be licensed for Oracle Enterprise Edition or Personal Edition.
You must use a server parameter file (SPFILE) to ensure the broker can persistently reconcile values between broker properties and any related initialization parameter values. See Section 4.3.2 for more information.
The value of the DG_BROKER_START parameter must be set to TRUE. See Section 3.3 for more information. (Enterprise Manager sets this parameter automatically.)
If any of the databases in the configuration is a RAC database, you must set up the DG_BROKER_CONFIG_FILEn initialization parameters for that database such that they point to the same shared files for all instances of that database. The shared files could be files on a cluster file system, if available, on raw devices, or stored using Automatic Storage Management (ASM).
Oracle Net Services network files must be set up on the primary database and on the standby database if you configure an existing standby database into the broker configuration. Otherwise, Enterprise Manager automatically sets up the network files when it creates a standby database.
If you are using a nondefault port number (for example, something other than port 1521) for the local listener address, you must set the LOCAL_LISTENER initialization parameter on each instance that is part of a broker configuration to a listener address that is reachable by all members of the configuration. See the Oracle Database Reference and the Oracle Database Net Services Administrator's Guide for additional information.
To enable DGMGRL to restart instances during the course of broker operations, a service with a specific name must be statically registered with the local listener of each instance. The value for the GLOBAL_DBNAME attribute must be set to a concatenation of db_unique_name_DGMGRL.db_domain. For example, in the LISTENER.ORA file:LISTENER = (DESCRIPTION = (ADDRESS_LIST=(ADDRESS=(PROTOCOL=tcp)(HOST=host_name) (PORT=port_num)))) SID_LIST_LISTENER=(SID_LIST=(SID_DESC=(SID_NAME=sid_name) (GLOBAL_DBNAME=db_unique_name_DGMGRL.db_domain) (ORACLE_HOME=oracle_home)))
Any database, including instances of the database, managed by the broker must be mounted.
If any of the databases in the configuration is a RAC database, the START_OPTIONS for that database must be set to MOUNT in the Oracle Cluster Repository (OCR) using srvctl as follows:srvctl add database -d <db_unique_name> -o <$oracle_home> -s mount or srvctl modify database -d <db_unique_name> -o <$oracle_home> -s mount
The primary database must be opened in ARCHIVELOG mode.
You must set the COMPATIBLE initialization parameter to 22.214.171.124.0 or higher for both the primary and standby databases. However, if you want to take advantage of new Oracle Database 10g features, set the COMPATIBLE parameter to 10.2.0.0.
Ensure the COMPATIBLE initialization parameter is set to the same value on both the primary and standby databases. If the values differ, redo transport services may be unable to transmit redo data from the primary database to the standby databases.
Oracle Database 10g includes several options and features that will need to be configured before you can get started. This chapter covers the configuration options you'll need to select and what they do in detail.This chapter is from the book
In This Chapter
Oracle has greatly improved the Oracle Enterprise Manager (OEM), giving it more tools for you to manage all components of the software and hardware framework in the corporate environment. The OEM has extended its level of control to manage Oracle databases, Oracle Application Server, Oracle Collaboration Suite, Oracle Ebusiness Suite, different hosts or servers in the environment, and application groups.
With the updated Enterprise Manager, you can perform all the database-administration activities as well as monitor and administer the different targets and applications in the corporate ecosystem. This will afford you a higher level of flexibility and functionality to centrally manage all the applications on a Web-based Grid Control Console over the Internet or an intranet. Using the Software Development Kit from Oracle, you can also add new targets in your environment as you expand the infrastructure.
A typical Enterprise Manager framework consists of the following components:
For more details on setting up and monitoring the grid environment, see Chapter 18, "Leveraging Grid Technology Features." In this chapter, we will go over the major steps involved in the setup and utilization of OEM for database-monitoring functions.OEM Preinstallation Requirements
Let us review the preinstallation requirements for Oracle Enterprise Manager for use with an Oracle database. We will discuss the requirements for the basic components of a small as well as a large environment. For more details, refer to Oracle Enterprise Manager Grid Control Installation and Basic Configuration 10g.
The management repository needs 1GB of hard disk and 512MB of memory for small environments with fewer than 25 managed targets. For a large organization with around 500 targets, the recommended memory is 2GB and 24–48GB of hard disk space depending on your installation and database requirements. The repository is created within two tablespaces, MGMT_TABLESPACE and MGMT_ECM_DEPOT_TS, requiring around 120MB of disk space for the smallest default installation.
The management service needs a minimum of 500MB for a Windows installation and around 1.5GB for UNIX, with a minimum memory of 1GB and a processor speed of 1GHz for the host. The management agent needs a minimum of 400MB of initial disk space for Solaris (350MB for Windows) to do all logging and tracing activities, and around 25MB of operating memory per database or application server. You will need proportionately higher numbers for the service and agent for larger installations.
The management repository requires Oracle9i Database (or RAC) Enterprise Edition Release 2 (126.96.36.199 or higher), or Oracle Database 10g Database (or RAC) Release 1 (10.1.0.3 or higher). Regardless of whether you choose to create a new database or use an existing database for the repository, the intended repository database must have fine-grained access control turned on with satisfactory software, patch, and tuning requirements met as per the installation guide.OEM Installation Process
Oracle Enterprise Manager is installed with a default super administrator account called SYSMAN. During the database installation process, you will install the OEM 10g database control. The Enterprise Manager directories and files are installed into each Oracle Database 10g home directory and database control commands are installed into ORACLE_HOME/bin directory. The database control has the necessary tools to help you manage the database. As for the management agent and management service support files, those files common to all database instances are stored in the ORACLE_HOME/sysman directory. Files unique to each database instance are stored under the ORACLE_HOME/hostname_sid directory. The presence of the hostname_sid directory indicates that the OEM database control was configured for that instance.
During the database-installation process, you will be prompted to provide a password for SYSMAN. This password is needed for the initial login to OEM. The SYSMAN account cannot be deleted or renamed. Oracle also recommends creating an administrator account using the SYSMAN account for each database administrator (DBA) using the system. This will help you to control access for every DBA working on the system in various roles and responsibilities.
The Enterprise Manager Configuration Assistant (EMCA) installation script (emca) for Oracle Enterprise Manager is located in the $ORACLE_HOME/bin directory in UNIX and Linux. When executed, the script will present a series of questions with regard to the host name, instance name, and so on, as given in Listing 3.1. Your screen may vary depending on the operating system being used. You should set the appropriate environment variables (ORACLE_HOME and ORACLE_SID) for the database to be managed before you run EMCA. The complete list of EMCA command-line arguments is given in the Oracle Enterprise Manager Grid Control Installation and Basic Configuration 10g guide. For Oracle Real Application Clusters (discussed later in this chapter), create the instances first and then configure the database control for each instance in the cluster using EMCA.Listing 3.1 Running the EMCA Installation Script STARTED EMCA at Fri Mar 18 08:24:06 CST 2005 Enter the following information about the database to be configured Listener port number: 1521 Database SID: Q0OR10G Service name: Q0OR10G Email address for notification: Email gateway for notification: Password for dbsnmp: Password for sysman: Password for sys: Password for sys: ----------------------------------------------------------------- You have specified the following settings Database ORACLE_HOME ............/opt/app/oracle/product/10.1.0/ Enterprise Manager ORACLE_HOME ........../opt/app/oracle/product/10.1.0/OEM Database host name ................QLAB10G.US.ACME.COM Listener port number ................ 1521 Database SID ................ Q0OR10G Service name ................ Q0OR10G Email address for notification ............... Email gateway for notification ............... ----------------------------------------------------------------- Do you wish to continue? [yes/no]: yes ........... ........... .......... ...........
When you do your OEM installation, you may see slightly different screens depending on your operating system. The dotted lines denote the execution of various scripts in the process.
The URL to access the Enterprise Manager from a Web browser for the preceding installation is http://QLAB10G.US.ACME.COM:5500/em.
You can now check the status of the OEM control using the command as shown in Listing 3.2.Listing 3.2 Checking the Status of OEM Control QLAB10G:/opt/app/oracle10g/product/10.1.0/bin> emctl status dbconsole Oracle Enterprise Manager 10g Database Control Release 10.1.0.2.0 Copyright (c) 1996, 2004 Oracle Corporation. All rights reserved. http://QLAB10G.US.ACME.COM:5500/em/console/aboutApplication Oracle Enterprise Manager 10g is running. ------------------------------------------------------------------ Logs are generated in directory /opt/app/oracle10g/product/10.1.0/QLAB10G.US.ACME.COM_Q0OR10G/sysman/log
If you are not sure of the various command options for emctl, type emctl at the command line and Oracle will provide all available options for the command. Listing 3.3 shows the result of this operation.Listing 3.3 Command Options for emctl QLAB10G:/opt/app/oracle10g/product/10.1.0/bin>emctl Oracle Enterprise Manager 10g Database Control Release 10.1.0.2.0 Copyright (c) 1996, 2004 Oracle Corporation. All rights reserved. Invalid arguments Unknown command option Usage:: Oracle Enterprise Manager 10g Database Control commands: emctl start| stop| status dbconsole emctl secure <options> emctl set ssl test|off|on em emctl set ldap <host> <port> <user dn> <user pwd> <context dn> emctl blackout options can be listed by typing "emctl blackout" emctl config options can be listed by typing "emctl config" emctl secure options can be listed by typing "emctl secure" emctl ilint options can be listed by typing "emctl ilint" emctl deploy options can be listed by typing "emctl deploy"
Once the installation is completed, use the appropriate URL to log in to OEM. For those who are using the Web browser version of OEM, type in the following address: http://localhost:port_number/em. The port number can be changed by modifying $ORACLE_HOME/install/portlist.ini. You can also use the OEM interface in Windows by choosing Start, Programs, Oracle Enterprise Manager Console Environment.
After you enter the user name and password, the Web interface will change into the instance summary display, which provides guidance through the rest of the instance administration tasks. The new look and feel of OEM provides a feature-rich display that allows a DBA to drill down to detailed reports on any metric.Control for Oracle Management Agents
If you installed the Oracle management agent as part of Grid Control or Application Server, it would have its own home (AGENT_HOME), like ORACLE_HOME. We will discuss briefly the process of controlling the management agent using emctl located in the AGENT_HOME/bin directory. You can use the emctl command to start, stop, or check the status of an agent. The syntax for the appropriate command on UNIX systems is emctl <start/stop/status> agent. For Windows-based systems, the agent is listed under Services (likely found in Control Panel). When you find the appropriate service, you can start or stop it using the Services control panel. You can also switch to the AGENT_HOME/bin directory using the DOS prompt on Windows and run the emctl commands.Automatic Alerts and Management
Before diving into alert management using OEM, let’s review some preliminary information on database metrics and alerts. Metrics are units of measurement to assess the health of your system with predefined thresholds for each unit. Oracle has thresholds for most of the metrics. When a metric reaches a threshold, an alert is generated. The alert also indicates that a particular condition has been encountered—for example, a threshold has been reached or an alert has been cleared. You can use OEM to set up alerts to send a notification to the DBA, start another job, and so on. The vast majority of the OEM metric-based alerts are polled by the management agent at intervals. As soon as the condition or conditions that triggered the alert are resolved and the metric’s value is within its predefined boundary, Oracle clears the alert.
You can review the metrics on the All Metrics page under Related Links on the OEM Database Home page. Refer to Figure 3.1 for details. An online help feature is available in OEM to give you a description of each metric. Alerts are displayed on the Database Home page under the Alerts section. Nondatabase alerts are displayed under Related Alerts.Metric-Thresholds Management
Oracle has provided a set of predefined metrics, some with predefined thresholds. When your database needs metrics outside these predefined values, you have to set thresholds to different values. These thresholds can be edited using OEM from the Database Home > Related Links > Manage Metrics link. The Manage Metrics page, shown in Figure 3.2, displays existing thresholds for metrics with response actions, if any. Review these thresholds and identify the values that need editing.
Using the Edit Thresholds link (see Figure 3.3), go to the editing screen, where you can enter new Warning Threshold and Critical Threshold values, or modify existing values. In the Response Actions field, you can add the name of a script or operating-system command to be executed when a threshold is crossed and an alert is issued. Click OK and save the changes made to the thresholds from this screen.Setup, Response, and Clearing of Alerts
OEM can be used to send alert notifications to the DBA by pager or email. From the Database Control page, click the Setup link (visible in header or footer area) and choose Notification Methods from the Setup page. Complete the information needed for the Mail Server section on this page. See Figure 3.4 for details.
From the Database Control page, choose the Preferences link, click General, and enter your email address in the E-mail Address section. Select Notification Rules and modify any default notification rules and severity settings for receiving notifications. Click the Help link to get more details on setting up the rules.
When you receive an alert, follow the alert recommendations or run ADDM or another advisor to get a more detailed diagnostic of the system and object behavior. You can also run a corrective script upon receiving an alert as given in the Metric Thresholds Management page.
Oracle clears most of the alerts automatically after the cause of the alert disappears. Some alerts need to be acknowledged by the DBA, while others may require corrective measures. After you take necessary corrective actions, acknowledge the alert by clearing it or purging it. The cleared alert is sent to the Alert History, which is viewable from the OEM home page under Related Links; purged alerts are deleted from the Alert History.
From the Home page, click on the Alerts link and select the alert to be cleared from the Alerts page. Choose Clear or Purge to act on the alert. You can also choose the Clear Every Open Alert or Purge Every Alert option from this screen, but neither one is a good choice.Mobile Management Using EM2Go
Oracle has introduced the EM2Go mobile application for use on personal digital assistants (PDAs) that support Microsoft Pocket PC Internet Explorer. This can be used to monitor the Oracle Enterprise Manager from a desktop as well as out of office over a wireless network. EM2Go is installed as a part of OEM.
EM2Go uses HTTPS communications and has the security model with administrator privileges and roles. You can connect your PDA desktop browser to the EM2Go URL and view targets assigned to you with proper privileges. No data is stored on the hand-held device; hence, a lost or stolen device poses no security risk.
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