5oracledatabase12c最大化應用程序的可用性(編輯修改稿)
2025-03-21 03:21 本頁面
【文章內容簡介】 fault – FALSE ? Applies to new sessions ? RETENTION_TIMEOUT ? Units – seconds ? Default – 24 hours (86400) ? Maximum value – 30 days (2592023) Transaction Guard Configuration Copyright 169。 2023, Oracle and/or its affiliates. All rights reserved. 16 Transaction Guard in Oracle database 12c ? JDBCthin, , OCI, OCCI ? Commit Models ? Local TXN ? Automit, Commit on Success ? Commit embedded in PL/SQL ? DDL, DCL, Parallel DDL ? Remote, Distributed ? Exclusions ? XA ? R/W DBLinks from Active Data Guard or Read Only Copyright 169。 2023, Oracle and/or its affiliates. All rights reserved. 17 Program Agenda ? Problems to Solve ? New Concepts ? Transaction Guard ?Application Continuity ? Design Considerations Copyright 169。 2023, Oracle and/or its affiliates. All rights reserved. 18 Application Continuity Mask Database Outage When Successful ?Replays inflight work on recoverable errors ?Masks many hardware, software, work, storage errors and outages when successful ?Improves end user experience 5. Response 1. Work Request 2. DB Calls 12c ORACLE Database 4. Replay 3. Errors Copyright 169。 2023, Oracle and/or its affiliates. All rights reserved. 19 Phases in Application Continuity 1Capture 2Reconnect 3Replay ? Demarcates database request ? Holds original calls with binds validation ? Manages queues ? Checks request has replay enabled ? Handles timeouts ? Creates a new connection ? Validates target database ? Uses Transaction Guard to enforce last mit ? Replays held calls ? Continues replay, if user visible results match, based on validations ? Continues request Copyright 169。 2023, Oracle and/or its affiliates. All rights reserved. 20 Application Continuity In Action Call 1 Application Proxy 1 Proxy 2 RAC Database Instance1 Instance2 Instance3 Call 2 Connection Replay Context Oracle JDBC Driver Copyright 169。 2023, Oracle and/or its affiliates. All rights reserv
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