PXC集群参数之wsrep_on
修改wsrep_on参数值为off，drop表，打开另一个会话，发现表依旧存在。这个参数的主要作用是控制当前结点的写入是不是要复制到其他节点。与MySQL的sql_log_bin很相似。测试过程如下：
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pxc01-->node1
mysql> show variables like 'wsrep_on';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| wsrep_on | ON |
+---------------+-------+
1 row in set (0.00 sec)
mysql> show status like 'wsrep%';
+----------------------------------+-------------------------------------------------------+
| Variable_name | Value |
+----------------------------------+-------------------------------------------------------+
| wsrep_local_state_uuid | 23e153df-b664-11e9-89e3-ff2ae4f77a67 |
| wsrep_protocol_version | 9 |
| wsrep_last_applied | 16 |
| wsrep_last_committed | 16 |
| wsrep_replicated | 1 |
| wsrep_replicated_bytes | 296 |
| wsrep_repl_keys | 3 |
| wsrep_repl_keys_bytes | 48 |
| wsrep_repl_data_bytes | 178 |
| wsrep_repl_other_bytes | 0 |
| wsrep_received | 6 |
| wsrep_received_bytes | 1206 |
| wsrep_local_commits | 1 |
| wsrep_local_cert_failures | 0 |
| wsrep_local_replays | 0 |
| wsrep_local_send_queue | 0 |
| wsrep_local_send_queue_max | 1 |
| wsrep_local_send_queue_min | 0 |
| wsrep_local_send_queue_avg | 0.000000 |
| wsrep_local_recv_queue | 0 |
| wsrep_local_recv_queue_max | 1 |
| wsrep_local_recv_queue_min | 0 |
| wsrep_local_recv_queue_avg | 0.000000 |
| wsrep_local_cached_downto | 14 |
| wsrep_flow_control_paused_ns | 0 |
| wsrep_flow_control_paused | 0.000000 |
| wsrep_flow_control_sent | 0 |
| wsrep_flow_control_recv | 0 |
| wsrep_flow_control_interval | [ 173, 173 ] |
| wsrep_flow_control_interval_low | 173 |
| wsrep_flow_control_interval_high | 173 |
| wsrep_flow_control_status | OFF |
| wsrep_cert_deps_distance | 2.000000 |
| wsrep_apply_oooe | 0.000000 |
| wsrep_apply_oool | 0.000000 |
| wsrep_apply_window | 1.000000 |
| wsrep_commit_oooe | 0.000000 |
| wsrep_commit_oool | 0.000000 |
| wsrep_commit_window | 1.000000 |
| wsrep_local_state | 4 |
| wsrep_local_state_comment | Synced |
| wsrep_cert_index_size | 5 |
| wsrep_cert_bucket_count | 22 |
| wsrep_gcache_pool_size | 2328 |
| wsrep_causal_reads | 0 |
| wsrep_cert_interval | 0.000000 |
| wsrep_open_transactions | 0 |
| wsrep_open_connections | 0 |
| wsrep_ist_receive_status | |
| wsrep_ist_receive_seqno_start | 0 |
| wsrep_ist_receive_seqno_current | 0 |
| wsrep_ist_receive_seqno_end | 0 |
| wsrep_incoming_addresses | 196.55.3.102:3308,196.55.3.102:3307,196.55.3.102:3306 |
| wsrep_cluster_weight | 3 |
| wsrep_desync_count | 0 |
| wsrep_evs_delayed | |
| wsrep_evs_evict_list | |
| wsrep_evs_repl_latency | 0/0/0/0/0 |
| wsrep_evs_state | OPERATIONAL |
| wsrep_gcomm_uuid | e0b9cedd-b698-11e9-90d1-8fe12b369d0b |
| wsrep_cluster_conf_id | 3 |
| wsrep_cluster_size | 3 |
| wsrep_cluster_state_uuid | 23e153df-b664-11e9-89e3-ff2ae4f77a67 |
| wsrep_cluster_status | Primary |
| wsrep_connected | ON |
| wsrep_local_bf_aborts | 0 |
| wsrep_local_index | 2 |
| wsrep_provider_name | Galera |
| wsrep_provider_vendor | Codership Oy |
| wsrep_provider_version | 3.37(r) |
| wsrep_ready | ON |
+----------------------------------+-------------------------------------------------------+
71 rows in set (0.01 sec)
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| roidba |
| sys |
+--------------------+
5 rows in set (0.00 sec)
mysql> set wsrep_on=off;
Query OK, 0 rows affected (0.00 sec)
mysql> use roidba
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> show tables;
+------------------+
| Tables_in_roidba |
+------------------+
| t |
| t1 |
+------------------+
2 rows in set (0.00 sec)
mysql> drop table t;
Query OK, 0 rows affected (0.01 sec)
mysql>
mysql> show tables;
+------------------+
| Tables_in_roidba |
+------------------+
| t1 |
+------------------+
1 row in set (0.00 sec)
pxc02-->node2
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| roidba |
| sys |
+--------------------+
5 rows in set (0.00 sec)
mysql> use roidba;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> show tables;
+------------------+
| Tables_in_roidba |
+------------------+
| t |
| t1 |
+------------------+
2 rows in set (0.00 sec)分享题目：PXC集群参数之wsrep_on
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