Problem Description
Oracle installation or runinstaller failed with below error message.
[INS-32042] The Installer has detected that the user (oracle) is not member of the central inventory group: wheel
Fix runInstaller [INS-32042] The Installer has detected that the user (oracle) is not member of the central inventory group: wheel
log file parallel write Wait Event , Cause, Related SQL queries, Possible Resolution
The "log file parallel write" wait event occurs when Oracle is writing redo log information to multiple redo log files in parallel. This wait event is related to the process of committing transactions and ensuring that redo log records are safely stored on disk.
Explanation:
During a transaction commit, the changes (redo log records) made in the transaction need to be written to the redo log files on disk to ensure data durability.
log file sync Wait Event , Cause, Related SQL queries, Possible Resolution
The "log file sync" wait event occurs when a session is waiting for a commit's redo records to be written from the redo log buffer to the redo log file on disk. This wait event is crucial for ensuring data durability and is typically associated with transaction commits.
Explanation:
When a user or application commits a transaction, the changes (redo records) are first written to the redo log buffer in memory.
db file scattered read - Wait Event , Cause, Related SQL queries, Possible Resolution
The "db file scattered read" wait event occurs when a session is waiting for multiple data blocks to be read from disk into the buffer cache in a scattered manner. This wait event is common when a query or operation requires access to multiple non-adjacent data blocks that are not currently in memory.
Explanation:
This wait event indicates that a session is waiting for I/O operations to complete, bringing the requested data blocks into memory.
It often occurs during full table scans or index range scans where multiple non-contiguous blocks are read.
db file sequential read - Wait Event , Cause, Related SQL queries, Possible Resolution
The "db file sequential read" wait event occurs when a session is waiting for a single data block to be read from disk into the buffer cache in a sequential manner. This wait event is common when a query or operation requires access to a specific data block that is not currently in memory.
Explanation:
This wait event indicates that a session is waiting for the I/O operation to complete, bringing the requested data block into memory.
It usually occurs during SELECT operations or when an index is being accessed.
It's a normal part of database operations, especially in OLTP systems where individual data blocks are frequently accessed.
How to Get Bind Variable Value in Oracle Database
To retrieve the value of a bind variable in Oracle, you can use the V$SQL_BIND_CAPTURE view or the DBMS_APPLICATION_INFO package, depending on your use case. Here's how you can do it:
Using V$SQL_BIND_CAPTURE View:
The V$SQL_BIND_CAPTURE view provides information about captured bind values for SQL statements in the library cache. You can query this view to retrieve the values of bind variables for specific SQL statements.
How to Get or Display Explain Plan of SQL Baseline - DBMS_XPLAN.display_sql_plan_baseline
you can use the DBMS_XPLAN. DISPLAY_SQL_PLAN_BASELINE procedure to display the execution plan associated with a specific SQL Baseline. This procedure is part of the DBMS_XPLAN package and is designed to show the execution plan for a SQL statement using its SQL ID or SQL handle, including those stored in SQL Plan Baselines.
Here's an example of how to use DBMS_XPLAN.DISPLAY_SQL_PLAN_BASELINE:
