Purpose
v$latch displays information about the latches on all OBServer nodes in the cluster.
Related tables/views
oceanbase.__all_virtual_latch
Fields
| Field | Type | Nullable? | Description |
|---|---|---|---|
| CON_ID | bigint(20) | NO | The ID of the tenant. |
| SVR_IP | varchar(32) | NO | The IP address. |
| SVR_PORT | bigint(20) | NO | The port number. |
| ADDR | varchar(256) | NO | At present, the value of this field is NULL. |
| LATCH# | bigint(20) | NO | The subscript of the class to which the latch belongs. |
| LEVEL# | bigint(20) | NO | The subscript of the level to which the latch belongs. |
| NAME | varchar(256) | NO | The name of the latch. |
| HASH | bigint(20) | NO | At present, the value of this field is 0. |
| GETS | bigint(20) | NO | The number of successful lockings. |
| MISSES | bigint(20) | NO | The number of times that the latch entered the waiting state. |
| SLEEPS | bigint(20) | NO | The total number of yields. |
| IMMEDIATE_GETS | bigint(20) | NO | The number of times the try_lock operation succeeded. |
| IMMEDIATE_MISSES | bigint(20) | NO | The number of times the try_lock operation failed. |
| SPIN_GETS | bigint(20) | NO | The total number of spins. |
| WAIT_TIME | bigint(20) | NO | The amount of time spent on waiting for the latch. |
