windowshostingleader.com – MySQL is merely probably the most effective way of storing data. It is versatile, comprehensive, and avoids storing data in 1 massive area. MySQL is utilised with a number of scripting languages, essentially the most common of which getting PHP.
MySQL, is created, distributed, and supported by Oracle Corporation. MySQL Server has a practical set of features developed in close cooperation with our users. It is really likely that your favored application or language supports the MySQL Database Server. Performance and scalability is actually a priority for MySQL, understanding from community feedback and taking into account trends and developments in personal computer hardware and its architecture.
Changes in MySQL 5.7.21
Audit Log Notes
- Event-matching filter rules for the
audit_log
plugin now support anabort
element, which can be used to prevent qualifying events from executing. For more information, see Audit Log Filtering. This capability can be used, for example, to augment the capabilities of MySQL Enterprise Firewall, which blocks SQL statements on a per-user basis, by writing audit filtering rules that match statements and block them based on characteristics of the statements themselves.
Deprecation and Removal Notes
- Previously, the
--transaction-isolation
and--transaction-read-only
server startup options corresponded to thetx_isolation
andtx_read_only
system variables. For better name correspondence between startup option and system variable names,transaction_isolation
andtransaction_read_only
have been created as aliases fortx_isolation
andtx_read_only
. Thetx_isolation
andtx_read_only
variables are now deprecated and will be removed in MySQL 8.0. Applications should be adjusted to usetransaction_isolation
andtransaction_read_only
instead. - The query cache is now deprecated and is removed in MySQL 8.0. Deprecation includes these items:
- The
FLUSH QUERY CACHE
andRESET QUERY CACHE
statements. - The
SQL_CACHE
andSQL_NO_CACHE
SELECT
modifiers. - These system variables:
have_query_cache
,ndb_cache_check_time
,query_cache_limit
,query_cache_min_res_unit
,query_cache_size
,query_cache_type
,query_cache_wlock_invalidate
. - These status variables:
Qcache_free_blocks
,Qcache_free_memory
,Qcache_hits
,Qcache_inserts
,Qcache_lowmem_prunes
,Qcache_not_cached
,Qcache_queries_in_cache
,Qcache_total_blocks
.
- The
- The mysql client by default strips comments in statements sent to the server, and this behavior is controlled using
--skip-comments
(strip comments), and--comments
(preserve comments).Comment stripping is now deprecated. This feature and the options to control it will be removed in a future MySQL release. - These syntax constructs for table and column references are now deprecated and will be removed in a future version of MySQL. Instances of these constructs should be changed to remove the leading period.
.
col_name
.
tbl_name
.
tbl_name
.col_name
Installation Notes
- For platforms that use systemd (see Managing MySQL Server with systemd), the data directory is initialized if empty at server startup. This might be a problem if the data directory is a remote mount that has temporarily disappeared: The mount point would appear to be an empty data directory, which then would be initialized as a new data directory. It is now possible to suppress this automatic initialization behavior. specify the following line in the
/etc/sysconfig/mysql
file (create the file if it does not exist):NO_INIT=true
(Bug #26595288, Bug #87287)
Packaging Notes
- mysqlcheck was missing in the MySQL Server Docker image, which prevented mysql_upgrade from running. (Bug #26400146, Bug #86968)
Security Notes
- Certificates automatically generated by mysqld and mysql_ssl_rsa_setup now use X509 v3 rather than v1. (Bug #26521654)
- The
keyring_okv
plugin now supports password-protecting the key file used for secure connections. See Using the keyring_okv KMIP Plugin.
X Plugin Notes
- A
Mysqlx.Connection.CapabilitiesGet
request using MySQL X Protocol did not return the complete list of available authentication mechanisms. (Bug #26044113) - For mixed case or uppercase schema names, the statement
list_objects
could incorrectly report a collection as a table. (Bug #25769683) - The X Plugin was omitted from the list of plugins to include for testing data directory permissions. (Bug #24823999)
Functionality Added or Changed
- Replication: In previous versions issuing
STOP GROUP_REPLICATION
stopped the plugin but the server still accepted transactions. This meant the transactions were not transmitted to the group. To makeSTOP GROUP_REPLICATION
safer, nowsuper_read_only
is set toON
immediately upon issuingSTOP GROUP_REPLICATION
, which ensures no transactions are accepted. (Bug #25495067, Bug #84795) -
Replication: The
group_replication_member_weight
variable has been added which enables you to control the election of new primaries in single-primary mode. In previous versions primary election was based on the member’s UUID, with the lowest UUID elected as the new primary in the event of fail over. Use this variable to assign numeric weights to members to ensure that specific members are elected, for example during scheduled maintenance of the primary or to ensure certain hardware is prioritised.
ASPHostPortal.com As The Best ASP.NET Hosting for MySQL 5.7.21
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