Error While starting an Oracle RAC database using srvctl, the startup failed with: PRCR-1079: Failed to start resource ora.RACDB.db CRS-5076: Startup of database resource ‘ora.RACDB.db’ is failing because DB_UNIQUE_NAME ‘RAC_DB’ is not expected Description …
Read MoreDescription: – Active Data Guard allows a physical standby database to be opened in READ ONLY mode while redo apply continues in the background. This enables the standby database to be used for reporting and…
Read MoreDescription: This guide provides a detailed, step-by-step process for installing and configuring the Oracle Enterprise Manager (OEM) 13.5 Management Agent on target servers. It starts with the initial OMS login…
Read MoreDescription: This document explains how we upgraded Oracle APEX, ORDS, and Java on the DBNAME database. It covers the checks and backups done before starting, the steps for installation and configuration, and how we fixed common issues during the process. The aim was to move from older versions to APEX 24.1, ORDS 24.1, and Java 11 smoothly, without affecting service availability. Componets Current versions Upgrade version Apex 22.2 24.1 Ords 21.2 24.1 Java Jdk-1.8 11.1 Pre checks and backups. Apex Workspace backups. Steps: Login to admin responsibility and take the workspace level backup. Using APEX port utility to take workspace and application backups in backend. Tomcat and Ords backup Taking current tomcat and ords backup using tar. Validate workspace schema backup should be taken in DBA team. Installation of apex in DB level.…
Read MoreDescription to standby: A standby database is a transactionally consistent replica of the primary database, designed to ensure continuity and data integrity in the event of disasters or data corruption. It allows the primary Oracle database to remain operational even during planned or unplanned outages. If the primary database becomes unavailable, Data Guard can seamlessly promote the standby database to the primary role, minimizing downtime. Additionally, the performance of the primary database can be optimized by redirecting resource-intensive tasks such as backups and reporting to the standby system. Therefore, keeping the standby database synchronized with the primary database is always advantageous. A standby database might lag behind the primary for various reasons like: Unavailability of or insufficient network bandwidth between primary and standby database Unavailability of Standby database Corruption / Accidental deletion of Archive Redo Data on primary CHECK THE SEQUENCE IN BOTH NODES: PRIMARY: SQL> select thread#, max(sequence#) “Last Primary Seq Generated” from v$archived_log val, v$database vdb where val.resetlogs_change# = vdb.resetlogs_change# group by thread# order by 1; THREAD# Last Primary Seq Generated ———- ————————– 1 556 STANDBY:…
Read MoreDescription: After configuring Data Guard, databases operate in either the primary or standby role, which can be switched dynamically without data loss or resetting redo logs. This process, known as a Switchover, can be executed using specific commands. Configuration Details: Environment detail Primary Standby SID SOURCE SOURCE DB Role Primary Physical standby Host prime.localdomain.com stand.localdomain.com DB Version 19.3.0.0 19.3.0.0 OS RHEL 7.9 RHEL 7.9 Step 1:- Check database role and database name Primary database:- SQL> select name,open_mode,database_role from v$database; NAME OPEN_MODE DATABASE_ROLE ——— ——————– —————- SOURCE READ WRITE PRIMARY Standby database:- SQL> select name,open_mode,database_role from v$database;…
Read MoreIntroduction to Failover: Oracle Failover is a critical feature designed to ensure high availability and continuous operation of Oracle databases in the event of unexpected system failures. In enterprise environments…
Read MoreISSUE: When I initiated the grid patch, it failed while executing the prerequisite with the following errors: PRVF-4083: Node reachability check failed from node <NODE1>. PRKN-1035: Host unreachable.” Cause of…
Read MoreIn this blog post, we will explore the process of scheduling and taking a backup of a SQL Server database using the SQL Server Agent method. Firstly, log in to…
Read MoreIn this blog post, we will explore the process of scheduling and taking a backup of a SQL Server database using the SQL maintenance plan method. Firstly, log in to…
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