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Standby Concepts and Configuration. Implementing Data Guard (Standby)General Concepts: Components. Roles, Interfaces. Architecture. Data Guard Protection Modes. Physical Standby Implementation with. RMAN (Recommended)Physical Standby. Implementation. Quick.

Physical Standby from a Hot backup. Logical Standby. Implementation with RMAN (Recommended)Logical Standby. Implementation. Logical Standby Sanity. Check. Troubleshooting a.

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Logical Standby. Logical Standby. Database Activation (Role Transition) - Switchover and. Failover. Suspend Physical.

Standby Recovery. Monitoring. Physical. Data Guard  (Detect Gap)Activate Physical. Standby (on Read- Only Mode or PROD Mode)Physical.

Switchover Steps. Physical. Failover Steps. Implementation Tips. Applying Patches with. Standby. Resolving Problems. Synchronize a GAP on the. STANDBY when ARCH Logs are lost.

Improvements. in 1. Using Flashback. with Data Guard. Monitor Data Guard. More. Information. General Concepts.

Oracle Data Guard is the management, monitoring, and automation. Data Guard Components. Oracle Data Guard consists of the following components: Primary Database. A primary database is a production database.

Standby Database. A physical or logical standby database is a database replica. A Data Guard. configuration consists of one production (or primary) database and. The databases in a Data Guard. Oracle Net and may be dispersed. There are no restrictions on where the databases. The DBA will configure log transport services.

Log transport services will also coordinate with log. Network Configuration. Tips For Learning Manual Driving School. The primary database is connected to one or more remote standby.

Oracle Net. Log Apply Services. Log apply services apply the archived redo logs to the standby. Failover should be performed when the primary.

Failover may or. may not result in data loss depending on the protection mode in. Switchover. A switchover is a role reversal between the primary database and.

A switchover guarantees no data loss. During a switchover, the primary database transitions to a. Data Guard Interfaces. Oracle provides three ways to manage a Data Guard environment: SQL*Plus.

SQL Statements. Using SQL*Plus and SQL commands to manage Data Guard environment. The following example. Welcome to DGMGRL, type .

DGMGRL> help The following commands are. See . This also means that rowids stay the same in a. On the primary database site, the log writer. LGWR) collects transactions from the log buffer. Data Guard’s asynchronous log transport (i.

The value is an. Oracle Net service name, which is assumed to be configured. FAL server. FAL. The value is.

Oracle Net service name, which is assumed to be configured. FAL server system to point to the FAL client.

Thanks to the FAL. This helps in the sense that you don't need.

FAL. It. is possible; however, to define these two parameters in the. Prior to Oracle 1. Redo Apply only worked with the standby. MOUNT state, preventing queries against. On Logical Standby, you can query it while. This is. ideal for business that requires a near real- time copy of your. DB for reporting.

The key advantage for logical standby databases is that they're opened read/write. That is, they can be used. It is indeed a fully. Also, additional indexes, materialized.

Oracle (or more exactly the log apply services) uses the. SQL. statements and replays them on the logical standby database. An Active Data Guard standby database is. More information. Snapshot Standby. A Snapshot Standby continues to receive, but.

When testing is. complete, the Snapshot Standby is converted back into a. Primary data is protected. More information HERE. A physical standby.

All recovery. operations are interchangeable between primary and Data Guard. Data. Protection Modes. Maximum. Protection: It offers the highest level of data. In. order to guarantee no loss of data can occur, the primary. Redo records are synchronously transmitted from. LGWR process. Standby online redo logs are. This protection mode is very similar to maximum protection where.

Redo records are synchronously transmitted from. LGWR process. Instead, the primary database will operate in maximum.

After all log gaps have been resolved, the. This protection mode supports both physical. Standby online redo logs are.

The. log. Signal commit success to the application only after. Maximum Availability. Zero data loss Single failure protection. LGWRSYNCAFFIRMStandby redo logs. Physical and logical standby. Signal commit success to the application only after. NET. The PROTECTION mode.

LGWR SYNC. and will shutdown the primary database if no standby database. The AVAILABILITY mode prevents a. SYNC transport. is required and this option is available to both logical and. Unlike PROTECTION mode, which. PERFORMANCE until the error is corrected.

PERFORMANCE mode is the default setting. A transaction will commit to the primary before all. To ensure that minimal data loss will be encountered execute. The database must be in. ALTER DATABASE SET STANDBY.

DATABASE TO MAXIMIZE AVAILABILITY; Terms or Options to know. These can be found in the Oracle documentation in Chapter 5 of. Data Guard Concepts and Administration Manual. This should only apply to the primary. This will not. help primary database performance.

Using ARCH waits for a. LGWR copies entries to a standby. ARCH will copy and apply. LGWR is more efficient since it writes redo entries. Additionally multiple. The default on my.

I have two standby databases. Specifies the maximum number of seconds between each. Used on Physical Implementation Only.

Using. Data Guard Redo Apply in a LAN the following is recommended. With a single remote archive destination, use. NOPARALLEL option (“lgwr sync=noparallel”). LGWR. ASYNC performance degraded no more than 1% as compared to using.

ARCH transport. LGWR ASYNC also bounds the risk of potential. ARCH transport. The 1. MB. async buffer outperformed smaller buffer sizes and reduced the. Metropolitan. and Wide Area Network (WAN)Data Guard is used across a metropolitan area networks (MAN) or.

WANs to get complete disaster  recovery protection. For the MAN/WAN tests. RTT’s were simulated during testing to measure. RTT on the primary database performance.

The. tests were conducted for the following RTT’s: 2 ms (MAN), 1. WAN) Additionally, tests using Secure Shell.

SSH) port forwarding with compression were also done for. RTT’s. Best practices recommendations are.

For these modes, the network RTT. WAN can impact response time and throughput of. The performance impact was less than 6%. RTT and a high transaction rate. LGWR. SYNC performance degraded no more than 2% as compared to remote. The 1. 0 MB async buffer outperformed smaller buffer.

This can improve transfer time to the. ARCH. transport. Best. Network Configuration and Highest Network Redo Rates.

Setting the Oracle network services session. SDU) to its maximum setting of 3. K resulted in a 5%. K) for. LGWR ASYNC transport services and a 1. LGWR. SYNC transport service. SDU designates the size of the Oracle. Net buffer used to collect data before it is delivered to the.

TCP network layer for transmission across the network. Oracle. internal testing of Oracle Data Guard has demonstrated that the. The gain in performance. Oracle Net buffers to the operating system. TCP network layer. SDU can be set on a per connection basis with.

SDU parameter in the local naming configuration file. SDU can be set for all Oracle Net connections. DEFAULT. This is specially true for WAN environment. Do not use SSH. with compression for Maximum Protection and Maximum Availability. Using. SSH port forwarding with compression reduced the network traffic.

CPU usage. This also eliminated. With the ARCH transport, using SSH also. RTT’s of 5. 0 ms or greater. For. RTT’s of 1. 0ms or less, the ARCH transport log transfer time was. SSH with compression. Physical. Standby Implementation.

NOTE = If you want to use the. Data Guard with RMAN, please check the. LINKThe following example shows how to set up Data Guard MANUALLY in. Listener. listener is on host server.

TNS. entry FGUARD4. Listener. listener is on host server. TNS. entry FGUARD.