Oracle
1Z0-888 · Question #92
1Z0-888 Question #92: Real Exam Question with Answer & Explanation
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Replication
Question
Consider a replication setup where a snapshot of the replication status shows:
mysql> SELECT CHANNEL_NAME, SERVICE_STATE, LAST_HEARTBEAT_TIMESTAMP,
RECEIVED_TRANSACTION_SET
FROM performance_schema.replication_connection_status;
+--------------+---------------+--------------------------+-------------------------------------------------+
| CHANNEL_NAME | SERVICE_STATE | LAST_HEARTBEAT_TIMESTAMP | RECEIVED_TRANSACTION_SET |
+--------------+---------------+--------------------------+-------------------------------------------------+
| melbourne | ON | 2018-05-08 14:39:50 | aa23540f-5272-11e8-8816-080027155584:6108-614465 |
| sydney | ON | 2018-05-08 14:55:01 | 4a8feff-5272-11e8-9320-080027155584:93604-201578 |
+--------------+---------------+--------------------------+-------------------------------------------------+
2 rows in set (0.00 sec)
mysql> SELECT CHANNEL_NAME, WORKER_ID, THREAD_ID, SERVICE_STATE |
LAST_SEEN_TRANSACTION
FROM performance_schema.replication_applier_status_by_worker;
+--------------+-----------+-----------+---------------+-------------------------------------------------+
| CHANNEL_NAME | WORKER_ID | THREAD_ID | SERVICE_STATE | LAST_SEEN_TRANSACTION |
+--------------+-----------+-----------+---------------+-------------------------------------------------+
| melbourne | 1 | 29 | ON | aa23540f-5272-11e8-8816-080027155584 |
| 080027155584a:128088 | 2 | 33 | ON | aa23540f-5272-11e8-8816-080027155584 |
| 080027155584a:128089 | 3 | 35 | ON | aa23540f-5272-11e8-8816-080027155584 |
| 080027155584a:128090 | 4 | 37 | ON | aa23540f-5272-11e8-8816-080027155584 |
| 080027155584a:128087 | 1 | 30 | ON | aa23540f-5272-11e8-8816-080027155584 |
| sydney | 1 | 32 | ON | 4a8feff-5272-11e8-9320-080027155584 |
| 080027155584a:201573 | 2 | 34 | ON | 4a8feff-5272-11e8-9320-080027155584 |
| 080027155584a:201574 | 3 | 36 | ON | 4a8feff-5272-11e8-9320-080027155584 |
| 080027155584a:201570 | 1 | 38 | ON | 4a8feff-5272-11e8-9320-080027155584 |
| 080027155584a:201513 | 1 | 4 | ON | 4a8feff-5272-11e8-9320-080027155584 |
+--------------+-----------+-----------+---------------+-------------------------------------------------+
8 rows in set (0.00 sec)
Which statement is true?
Options
- AThe melbourne channel is resolving a GTID conflict.
- BThe sydney channel is keeping up with the received events.
- CThe melbourne channel is keeping up with the received events.
- DThe last event received from the sydney channel was at 2018-05-08 14:55:01.
- EThe replication slave uses multisource replication with eight sources.
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Topics
#Multisource Replication#Replication Channels#Replication Workers#Performance Schema