Checking All Disks in Diskgroup Data

This SQL code instructs Oracle to perform a thorough check of all disks within the diskgroup named data1.

Check the internal consistency of a diskgroup

SQL Code

1alter diskgroup data1 check all

Sample Oracle Output:

2no rows selected

Description of the Oracle Database SQL code:


  • To initiate a comprehensive check of all disks within the diskgroup named data1 in an Oracle Database environment.
  • To proactively identify and address potential disk-related issues that could impact data integrity and availability.


  • alter diskgroup: This clause signals a modification to an existing diskgroup.
  • data1: Specifies the name of the targeted diskgroup.
  • check: Initiates the disk verification process.
  • all: Instructs Oracle to check all disks within the specified diskgroup, encompassing both data disks and disks containing metadata.

Key Points:

  • Comprehensive Check: The command analyzes all disks within the diskgroup, ensuring a thorough assessment of disk health.
  • Metadata Verification: It validates the consistency and integrity of diskgroup metadata, crucial for proper disk management and data access.
  • Potential Repair: Depending on the Oracle Database version and configuration, the check might initiate automatic repair of minor inconsistencies, enhancing proactive maintenance.
  • Alert Log: The results of the check, including any detected errors or warnings, are typically recorded in the Oracle Database alert log for review and further action.

Insights and Explanations:

  • Regular Maintenance: Running this command periodically is considered a best practice for maintaining optimal disk health and preventing potential data corruption or storage-related issues.
  • Performance Impact: The check can consume resources and temporarily impact database performance. It's often recommended to execute it during planned maintenance windows or periods of lower database activity.
  • Error Handling: Thoroughly review any errors or warnings reported in the alert log and take appropriate actions, such as disk replacement or more extensive repairs, to address them promptly.
  • Additional Options: The alter diskgroup command offers other options for targeted checks, such as checking specific disks or failure groups within a diskgroup.

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