SAP HANA thread issues can manifest in various ways, indicating potential performance bottlenecks or system problems. Here are some check IDs:
|
Check ID |
Details |
|
M0716 |
Number of statistics server worker threads |
|
M0751 |
Historic thread samples save interval (s) |
|
M0885 |
SqlExecutor threads with significant
duration |
|
M0887 |
Application users with significant threads |
|
M0890 |
Unusual frequent thread methods (last hour) |
|
T0110 |
Insert int HOST_SERVICE_THREAD_SAMPLES failed |
|
C0380 |
Joining of thread contexts |
Similarly below are the symptoms of thread-related issues in SAP HANA:
1. High CPU
Utilization
- Symptoms: Prolonged periods of high CPU usage.
- Indications: Threads may be stuck in a busy loop, or
there may be inefficient query processing.
2. Thread
Pool Exhaustion
- Symptoms: New requests being delayed or failing.
- Indications: The number of active threads has
reached the maximum limit, and new threads cannot be created.
4. Lock
Waits and Deadlocks
- Symptoms: Queries and transactions experiencing
delays or timeouts.
- Indications: Threads are waiting for locks held by
other threads, leading to lock contention or deadlocks.
5. High
Wait Times
- Symptoms: Increased query execution times.
- Indications: Threads spending excessive time waiting
for resources, such as I/O operations, locks, or network responses.
6. Slow
Query Performance
- Symptoms: Queries taking significantly longer to
execute than expected.
- Indications: Inefficient execution plans or
insufficient threading leading to suboptimal use of CPU and memory
resources.
8. Blocked
Threads
- Symptoms: Specific operations or queries becoming
unresponsive.
- Indications: Threads being blocked by other
long-running threads or waiting indefinitely for resources.
9. Database
Hangs or Freezes
- Symptoms: The entire SAP HANA database becoming
unresponsive.
- Indications: Severe thread contention or resource
exhaustion causing the system to hang.