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https://dev.mysql.com/doc/refman/8.0/en/problems-connecting.html
If you have updated an existing MySQL installation to a newer version, did you perform the MySQL upgrade procedure? If not, do so. If you change the grant tables directly (for example, by using INSERT, UPDATE, or DELETE statements) and your changes ... If you encounter problems when you try to connect to the MySQL server, the following items describe some courses of action you can take to correct the ...
https://dev.mysql.com/doc/refman/8.0/en/replica-io-thread-states.html
This enables monitoring tools that rely on the old names to continue working until they can be updated to use the new names. Waiting for master update From MySQL 8.0.26: Waiting for source update The initial state before Connecting to master or ...
https://dev.mysql.com/doc/refman/8.0/en/replica-sql-thread-states.html
This enables monitoring tools that rely on the old names to continue working until they can be updated to use the new names. Slave has read all relay log; waiting for more updates From MySQL 8.0.26: Replica has read all relay log; waiting for more ... The following list shows the most common states you may see in the State column for a replication SQL thread on a replica ...
https://dev.mysql.com/doc/refman/8.0/en/replication-administration-status.html
The source sends a heartbeat signal to a replica if there are no updates to, and no unsent events in, the binary log for a longer period than the heartbeat interval. row *************************** Id: 10 User: root Host: replica1:58371 db: NULL ...
https://dev.mysql.com/doc/refman/8.0/en/replication-features-max-allowed-packet.html
Row-based replication sends all columns and column values for updated rows from the source to the replica, including values of columns that were not actually changed by the update. This means that, when you are replicating large column values using ... max_allowed_packet sets an upper limit on the size of any single message between the MySQL server and clients, including ...
https://dev.mysql.com/doc/refman/8.0/en/replication-setup-replicas.html
The database updates are automatically propagated to the replicas: $> mysql -h source < fulldb.dump 19.1.2.6.2 Setting Up Replication with Existing Data When setting up replication with existing data, transfer the snapshot from the source to the ...
https://dev.mysql.com/doc/refman/8.0/en/replication.html
This model can improve the performance of writes (since the source is dedicated to updates), while dramatically increasing read speed across an increasing number of replicas. Replication is asynchronous by default; replicas do not need to be ...
https://dev.mysql.com/doc/refman/8.0/en/rewriter-query-rewrite-plugin-reference.html
If the column exists when the rules table is loaded into memory, the plugin updates it with the pattern digest. If the column exists when the rules table is loaded into memory, the plugin updates it with the normalized form of the pattern. Invoke ...
https://dev.mysql.com/doc/refman/8.0/en/selecting-all.html
Fix only the erroneous record with an UPDATE statement: mysql> UPDATE pet SET birth = '1989-08-31' WHERE name = 'Bowser'; The UPDATE changes only the record in question and does not require you to reload the table. For example, you may happen to ...
https://dev.mysql.com/doc/refman/8.0/en/shared-key-cache.html
Threads can access key cache buffers simultaneously, subject to the following conditions: A buffer that is not being updated can be accessed by multiple sessions. A buffer that is being updated causes sessions that need to use it to wait until the ...Multiple sessions can initiate requests that result in cache block replacements, as long as they do not interfere with each other (that is, as long as they need different index blocks, and thus cause different cache blocks to be ...