Check and solve SQL Server2000 SP4 Problems

Database management systems such as SQL Server rely on timely file input/output operations. Failure or misconfiguration of hardware, firmware settings, filter drivers, compression, program errors, and other conditions in the I/O path may cause blocking or delay of I/O problems, and it will soon have a negative impact on SQL Server performance.

The effects of the above problems on SQL Server vary greatly depending on the problem details, but they usually lead to blocking, lock contention and timeout, long response time, and excessive resource utilization.

Blocking I/O is an I/O Request (usually an I/O Request Packet (IRP) that must be performed by external intervention )). This usually requires a complete system restart or similar operation to solve the problem, and strongly indicates that the hardware is faulty or there is a program error in the I/O path component.

Latency I/O refers to the I/O requests that can be completed without intervention but take longer than expected (likewise, this is usually IRP ). This situation is typically caused by hardware configuration, firmware settings, or filter driver intervention that requires assistance from hardware or software vendors for tracking and resolution.

SQL Server 2000 SP4 contains the database and log file I/O (read and write) logic to detect latency and congestion. When the I/O operation has not been completed for 15 seconds or longer, SQL Server detects and reports this situation. The following messages are recorded in the SQL Server Error Log:

2004-11-11 00:21:25.26 spid1 SQL Serverhas encountered 192 occurrence(s) of IO requests taking longer than 15 seconds to complete on file [E:\SEDATA\stressdb5.ndf] in database [stressdb] (7). The OS file handle is 0x00000000000074D4. The offset of the latest long IO is: x00000000022000".

This message indicates that the current workload requirement exceeds the I/O path or the current system configuration and function, or the I/O path contains software (firmware and driver) that cannot work normally) or hardware components.

The error information recorded provides the following information:

• ### Occurrences-Number of I/O requests that fail to complete read or write operations within 15 seconds.

• File information-complete File name, database name, And DBID of the affected File.

• File handle-the operating system handle of the File. You can use the debugger and other utilities to track IRP requests.

• Offset-the Offset of the last blocked or delayed I/O. You can use the debugger and other utilities to track IRP requests. (Note: When recording the message, the I/O may not be blocked or delayed .)

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