Parameters for Comparison

Parameter comparison helps you check consistency between the source and destination database data to ensure your services will not be affected after being migrated.

This section lists the common parameters and performance parameters of different DB engine versions for your reference during parameter comparison.

MySQL 5.6

**Table 1** MySQL 5.6 parameters to be compared
Parameter	Type	Restart Required
connect_timeout	Common parameter	No
event_scheduler	Common parameter	No
innodb_lock_wait_timeout	Common parameter	No
max_connections	Common parameter	No
net_read_timeout	Common parameter	No
net_write_timeout	Common parameter	No
explicit_defaults_for_timestamp	Common parameter	Yes
innodb_flush_log_at_trx_commit	Common parameter	No
max_allowed_packet	Common parameter	No
tx_isolation	Common parameter	No
character_set_client	Common parameter	No
character_set_connection	Common parameter	No
collation_connection	Common parameter	No
character_set_results	Common parameter	No
collation_server	Common parameter	No
binlog_stmt_cache_size	Performance parameter	No
bulk_insert_buffer_size	Performance parameter	No
innodb_buffer_pool_size	Performance parameter	Yes
innodb_buffer_pool_instances	Performance parameter	Yes
key_buffer_size	Performance parameter	No
long_query_time	Performance parameter	No
query_cache_type	Performance parameter	Yes
read_buffer_size	Performance parameter	No
read_rnd_buffer_size	Performance parameter	No
sort_buffer_size	Performance parameter	No
sync_binlog	Performance parameter	No

MySQL 5.7

**Table 2** MySQL 5.7 parameters to be compared
Parameter	Type	Restart Required
connect_timeout	Common parameter	No
event_scheduler	Common parameter	No
innodb_lock_wait_timeout	Common parameter	No
max_connections	Common parameter	No
net_read_timeout	Common parameter	No
net_write_timeout	Common parameter	No
explicit_defaults_for_timestamp	Common parameter	No
innodb_flush_log_at_trx_commit	Common parameter	No
max_allowed_packet	Common parameter	No
tx_isolation	Common parameter	No
character_set_client	Common parameter	No
character_set_connection	Common parameter	No
collation_connection	Common parameter	No
character_set_results	Common parameter	No
binlog_cache_size	Performance parameter	No
binlog_stmt_cache_size	Performance parameter	No
bulk_insert_buffer_size	Performance parameter	No
innodb_buffer_pool_size	Performance parameter	No
innodb_buffer_pool_instances	Performance parameter	Yes
key_buffer_size	Performance parameter	No
long_query_time	Performance parameter	No
query_cache_type	Performance parameter	No
read_buffer_size	Performance parameter	No
read_rnd_buffer_size	Performance parameter	No
sort_buffer_size	Performance parameter	No
sync_binlog	Performance parameter	No

MySQL 8.0

**Table 3** MySQL 8.0 parameters to be compared
Parameter	Type	Restart Required
connect_timeout	Common parameter	No
event_scheduler	Common parameter	No
innodb_lock_wait_timeout	Common parameter	No
max_connections	Common parameter	No
net_read_timeout	Common parameter	No
net_write_timeout	Common parameter	No
explicit_defaults_for_timestamp	Common parameter	No
innodb_flush_log_at_trx_commit	Common parameter	No
max_allowed_packet	Common parameter	No
tx_isolation	Common parameter	No
character_set_client	Common parameter	No
character_set_connection	Common parameter	No
collation_connection	Common parameter	No
character_set_results	Common parameter	No
binlog_cache_size	Performance parameter	No
binlog_stmt_cache_size	Performance parameter	No
bulk_insert_buffer_size	Performance parameter	No
innodb_buffer_pool_size	Performance parameter	No
innodb_buffer_pool_instances	Performance parameter	Yes
key_buffer_size	Performance parameter	No
long_query_time	Performance parameter	No
query_cache_type	Performance parameter	No
read_buffer_size	Performance parameter	No
read_rnd_buffer_size	Performance parameter	No
sort_buffer_size	Performance parameter	No
sync_binlog	Performance parameter	No

Currently, only MySQL databases support the parameter comparison function.
The value of innodb_buffer_pool_size is set to not exceed 70% of the total memory of the destination database. If you set a larger value for parameter, the destination database startup may fail. Therefore, values of innodb_buffer_pool_size in the source and destination databases are different. You can adjust the value to suit your services.

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