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Database Reference, 12c Release 1 (12.1)

WCR: replay lock order

C.3.170 WCR: replay lock orderA session will wait on this event during replay if it saw some lock contention during capture. Wait … wait for scn's hi 4 bytes High 4 bytes of the 8-byte replay SCN that the session is waiting on wait … for scn's lo 4 bytes Low 4 bytes of the 8-byte replay SCN that the session is waiting on

Database Reference, 12c Release 1 (12.1)

WCR: replay clock

C.3.169 WCR: replay clockA session will wait on this event during replay if it has some logical dependencies on another … replay SCN that the session is waiting on wait for scn's lo 4 bytes Low 4 bytes of the 8-byte replay SCN that the session is waiting on

Database Reference, 12c Release 1 (12.1)

WCR: replay client notify

C.3.168 WCR: replay client notifyDuring replay, the Workload Replay Client always keeps an open connection to the database to detect … some special errors. This session will normally be in the wait state until some specific replay … () to be issued. 2 - waiting for the replay to run to completion or REPLAY.CANCEL() to be issued.

Database Reference, 12c Release 1 (12.1)

WCR: replay paused

C.3.171 WCR: replay pausedwaiting on this wait event until replay is resumed. Parameters: None

Database Concepts, 12c Release 1 (12.1)

Glossary

replay contextIn Application Continuity, opaque information that the database returns to the client driver during normal application run time.

Database Development Guide, 12c Release 1 (12.1)

High Availability

4.1 Failover and Query ReplayThis topic describes the following topics: Transparent Application Failover (TAF) Application Continuity

Real Application Clusters Administration and Deployment Guide, 12c Release 1 (12.1)

Disabling Replay

Disabling ReplaySome application request s are unsuitable for replay. If any application modules are using such … designs, then the disable replay API allows disabling of replay on a per request basis. Disabling … replay can be added to the callback or to mainline code. Disabling replay requires a callback or change

Real Application Clusters Administration and Deployment Guide, 12c Release 1 (12.1)

Application Continuity: Automated Replay for Masking Outages

Application Continuity: Automated Replay for Masking Outages-recoverable error that would not be available for replay. When Application Continuity is configured, an … end-user request is executed at-most once; replay is started if the time has not exceeded the replay … user as a slightly delayed execution. When replay succeeds, this feature masks applications from … applications

Database Testing Guide, 12c Release 1 (12.1)

Replay Divergence

13.3.2.2 Replay DivergenceThis section contains the divergence analysis of the second run relative to the first. If the analysis shows significant divergence, review the full divergence report.

Database Testing Guide, 12c Release 1 (12.1)

Workload Replay

9.3 Workload Replayworkload replay phase, Oracle Database performs the actions recorded during the workload capture phase … , concurrency, and transaction dependencies of the production system. Database Replay uses a client program … called the replay client to re-create all external client requests recorded during workload capture … . Depending

Database Testing Guide, 12c Release 1 (12.1)

Database Replay

Part II Database ReplayDatabase Replay enables you to replay a full production workload on a test system to assess the … overall impact of system changes. Part II covers Database Replay and contains the following chapters … : Introduction to Database Replay Capturing a Database Workload Preprocessing a Database Workload … Replaying

Database Testing Guide, 12c Release 1 (12.1)

Database Replay

1.2 Database Replayone of the biggest challenges when validating system changes. Database Replay enables realistic … . Using Database Replay, you can capture a workload on the production system and replay it on a test … potential problems, such as new errors encountered and performance divergence. Database Replay … scripts, resulting

Database Concepts, 12c Release 1 (12.1)

Transactions

Application Continuity ArchitectureThe Application Continuity architecture includes the JDBC replay driver and the continuity director … . The components work together to execute capture and replay as follows: JDBC replay driver The JDBC … replay driver intercepts execution errors and, when these errors are recoverable, automatically … replays

Database Testing Guide, 12c Release 1 (12.1)

Creating a Replay from a Replay Task

11.1.2 Creating a Replay from a Replay TaskTo create the replay: From the Database Replay page, click the Replay Tasks tab. Click the link for … the desired replay task in the table. The Replay Task page for the capture appears. Description of … section. The Create Replay pop-up appears. Provide a required Name and optional description,

Database Concepts, 12c Release 1 (12.1)

Transactions

How Application Continuity Worksare as follows: The client application submits a request that the JDBC replay driver receives. The … replay driver sends the calls that form the request to the database, receiving directions for each call … from the database. The replay driver receives a Fast Application Notification (FAN) or recoverable … error. The replay

Database Testing Guide, 12c Release 1 (12.1)

Defining Replay Schedules

15.2.4.1.1 Adding Workload CapturesThe first type of operation performed by a replay schedule is to add the participating workload … captures to a replay. When a workload capture is added to a replay schedule, a unique number is … returned to identify the workload capture. A workload capture can be added to a replay schedule more than … once, as

Database Testing Guide, 12c Release 1 (12.1)

Using Consolidated Database Replay

15 Using Consolidated Database ReplayDatabase Replay enables you to capture a workload on the production system and replay it on a test … Replay may not accurately predict how much additional workload can be handled by the new system. For … in much lower resource usage (such as host CPU and I/O) during replay because the new system is … . Consolidated

Database Testing Guide, 12c Release 1 (12.1)

Resuming a Workload Replay

12.6.9 Resuming a Workload ReplayThis section describes how to resume a workload replay that is paused. To resume a workload replay

Database Testing Guide, 12c Release 1 (12.1)

Reviewing Workload Replay Reports

13.2.3 Reviewing Workload Replay Reportscompared to what was captured. There are numerous factors that can cause replay divergence, which can … be analyzed using the workload replay report. The information contained in the workload replay … report consists of performance and replay divergence. Performance divergence may result when new … algorithms

Database Testing Guide, 12c Release 1 (12.1)

Starting Replay Clients

12.1.8.2 Starting Replay ClientsAfter determining the number of replay clients that are needed to replay the workload, you need to … start the replay clients by running the wrc executable in replay mode on the hosts where they are … installed. Once started, each replay client will initiate one or more sessions with the database to