Windows builds now use the default runtime libraries (builds use the
/MD
flag). (Bug #25611609)CMake
support was added for compiling with Developer Studio 12.6. (Bug #25384295)
MySQL failed to compile if
-DENABLE_DEBUG_SYNC=OFF
AND-DWITH_DEBUG=ON
were both given. TheENABLE_DEBUG_SYNC
option has been removed and enablingWITH_DEBUG
enables Debug Sync. (Bug #18374703)
Microsoft Windows: Reminder: MySQL 5.6 requires the Microsoft Visual C++ 2010 Redistributable Package to run on Windows platforms. Users should make sure the package has been installed on the system before starting the server. The package is available at the Microsoft Download Center.
Changes in RPM package structure require a larger set of packages to be removed to install MySQL Server cleanly. (Bug #25603087)
To avoid potential race conditions, Debian packages now use the GNU install utility rather than a combination of mkdir, touch, and chown. (Bug #25258829)
CMake-generated packaging for Debian/Ubuntu packages was refactored for improved maintainability. The change includes updated logic for correctly replacing native distribution packaging in Debian and Ubuntu. (Bug #25126961, Bug #25251872, Bug #84198)
-
The linked OpenSSL library for the MySQL Commercial Server has been updated to version 1.0.2k. Issues fixed in the new OpenSSL version are described at http://www.openssl.org/news/vulnerabilities.html.
This change does not affect the Oracle-produced MySQL Community build of MySQL Server, which uses the yaSSL library instead. (Bug #25768671, Bug #25615451)
-
The
mysql_options()
C API function now supports aMYSQL_OPT_SSL_MODE
option. The only permitted option value isSSL_MODE_REQUIRED
, to require an encrypted connection to the server. It causesmysql_real_connect()
to fail if an encrypted connection cannot be obtained, without falling back to an unencrypted connection. Thus,mysql_real_connect()
returns an error if the server does not support SSL or the client is not configured to use SSL. The client/server exchange terminates immediately after the initial server packet has been received if the server indicates that it does not support SSL.To require an encrypted connection in MySQL 8.0, the standard MySQL client programs call
mysql_options()
to setMYSQL_OPT_SSL_MODE
if the--ssl-mode=REQUIRED
command-line option was specified. Third-party applications that must be able to require encrypted connections can use the same technique. For details, see mysql_ssl_set().The minor C API version number was not incremented for this change. Application programs compiled for MySQL 8.0 that require
MYSQL_OPT_SSL_MODE
may fail to operate properly if the dynamic loader provides an older client library withoutMYSQL_OPT_SSL_MODE
. Such applications must be written to handle this possibility by checking whether themysql_options()
call succeeds or fails. (Bug #25575605)
To improve
thread_pool
plugin performance, connection authentication and initialization have been moved from the acceptor thread to the thread pool worker threads that handle client connections. This enables the acceptor thread to handle new connections at a higher rate with reduced latency. TheINFORMATION_SCHEMA
TP_THREAD_GROUP_STATE
table now contains aCONNECT_THREAD_COUNT
column that indicates the number of threads that are processing or waiting to process connection initialization and authentication. There can be a maximum of four connection threads per thread group; these threads expire after a period of inactivity. (Bug #17159742, WL #7195, WL #10287)
-
Replication: When a negative or fractional timeout parameter was supplied to
WAIT_UNTIL_SQL_THREAD_AFTER_GTIDS()
, the server behaved in unexpected ways. With this fix:A fractional timeout value is read as-is, with no round-off.
A negative timeout value is rejected with an error if the server is on a strict SQL mode; if the server is not on a strict SQL mode, the value makes the function return NULL immediately without any waiting and then issue a warning.
(Bug #24976304, Bug #83537)
The performance of UTF-8 binary collations was improved. (Bug #24788778, Bug #83247, Bug #25076862)
Consistency and maintainability of Debian/Ubuntu packaging maintainer scripts was improved. (Bug #23588977)
mysql_secure_installation is more strict about what it considers valid yes and no responses. (Bug #13344753, Bug #62925)
InnoDB: The restriction that required the first undo tablespace to use space ID 1 was removed. The first undo tablespace may now be assigned a space ID other than 1. Space ID values for undo tablespaces are still assigned in a consecutive sequence. (Bug #25551311)
InnoDB: Compiling the server without the Performance Schema caused a build failure. (Bug #25348787)
InnoDB: The file handle type name for
InnoDB
file I/O Performance Schema instrumentation was changed fromos_pfs_file_t
topfs_os_file_t
. (Bug #25220118)InnoDB: A server exit on restart was caused by missing
my_thread_init()
andmy_thread_exit()
functions for background threads that initialize thest_my_thread_var
structure. (Bug #25167032)InnoDB: A memcached read operation with a non-default read batch size configuration resulted in a server exit. (Bug #25147515)
InnoDB: An error in code related to table statistics raised an assertion in the
dict0stats.cc
source file. (Bug #24585978)InnoDB: Performance Schema instrumentation for
InnoDB
file I/O was disabled on Windows. (Bug #14025581)InnoDB: The
row_search_mvcc()
function unnecessarily traversed the entire table for a range query, which occurred when the record was not in the transaction read view. (Bug #84202, Bug #23481444, Bug #25251375)Replication: When using a multithreaded slave (
slave_parallel_workers
greater than 0) the value ofSeconds_Behind_Master
was incorrect when rotating a relay log. (Bug #23532304)Ubuntu 12.04 LTS: This is the last release in the MySQL 8.0 series to support Ubuntu 12.04 LTS. As per the MySQL Support Lifecycle policy regarding ending support for OS versions that are obsolete or have reached end of life, we plan to discontinue building binaries for the Linux distribution in future releases. (Bug #25828475)
Oracle Linux 5, Red Hat Enterprise Linux 5, and CentOS 5: This is the last release in the MySQL 8.0 series to support Oracle Linux 5, Red Hat Enterprise Linux 5, and CentOS 5. As per the MySQL Support Lifecycle policy regarding ending support for OS versions that are obsolete or have reached end of life, we plan to discontinue building binaries for those Linux distributions in future releases. Moreover, we plan to build the generic Linux tarballs for the next release on Oracle Linux 6 using glibc 2.12. (Bug #25828375)
mysqldump failed to properly quote certain identifiers in SQL statements written to the dump output. (Bug #25717383)
Client preauthorization by the server was missing a length check for a length-encoded string. (Bug #25714674)
For Debian/Ubuntu packages, user-defined collation files could be overwritten during MySQL upgrades. Charset files are now marked as conffiles so that user customizations generate a prompt during upgrades whether to overwrite them. (Bug #25525628, Bug #84761)
For
CREATE TABLE
statements that specified the table name with a database qualifier and included aDATA DIRECTORY
orINDEX DIRECTORY
option, an error occurred if there was no default database. (Bug #25514146, Bug #84861)Starting the server with
performance_schema_digests_size=1
caused an abnormal exit. (Bug #25492129, Bug #84786)mysqld_safe did not check whether the directory named by the
--basedir
option existed. (Bug #25365194)mysqld_safe failed if the error log file named by the
--log-error
option was a FIFO. (Bug #25356221, Bug #84427)mysqld_safe could fail if the
--datadir
option value ended with a/
character. (Bug #25319457)A recent change to mysqld_safe caused the mysql.server script to be unable to start it if the base directory was specified as an absolute path that differed from the compiled-in default absolute path. (Bug #25319392, Bug #84263)
-
The fix for Bug #78777 had different effects depending on whether the Performance Schema is enabled. (Bug #25309017, Bug #84305)
References: This issue is a regression of: Bug #78777.
The
CONNECTION_CONTROL
plugin failed to compile if the Performance Schema was disabled. (Bug #25308357, Bug #84304)For System V init scripts for RPMs, the
[mysqld]
option-file section was being ignored for some options, such aspid-file
. (Bug #25287707, Bug #84172)Init scripts failed to launch mysqld_safe if a non-default base directory was used. (Bug #25261472, Bug #84219)
mysqld_safe --no-defaults did not work (inadvertent consequence of an earlier bug fix). (Bug #25244898, Bug #84173)
Semicolon (
;
) characters within or between statements could cause distinct digests to be generated from identical statements. (Bug #25244533, Bug #83253)For a client linked against
libmysqlclient
, invalid memory access could occur during use of prepared statements. (Bug #25164932)-
The fix for Bug #25088048 caused the command used by mysqld_safe to start the MySQL server to no longer include the mysqld path. (Bug #25144379)
References: This issue is a regression of: Bug #25088048.
Executing a stored procedure containing a query that accessed a view could allocate memory that was not freed until the session ended. (Bug #25053286)
A query could produce incorrect results if the
WHERE
clause contained a dependent subquery, the table had a secondary index on the columns in the select list followed by the columns in the subquery, andGROUP BY
orDISTINCT
permitted the query to use a Loose Index Scan. (Bug #24671968, Bug #83005)Creation of a
MyISAM
temporary table during query processing could fail if the key length in the query was greater than the maximumMyISAM
key length, resulting in a server exit. (Bug #24659861)The
DebugPrintTest
andDebugPrintDeathTest
unit tests did not handle divide-by-zero testing properly on the Aarch64 platform. Thanks to Alexey Kopytov for the patch. (Bug #24624555, Bug #82889)-
Changes made to mysqld_safe in recent MySQL releases require the
--ledir
,--mysqld
,--mysqld-version
options to be specified on the command line; they can no longer be specified in option files. This could cause failure of init scripts that invoke mysqld_safe. Such scripts now pass the value of theMYSQLD_OPTS
environment variable as the first command-line argument to mysqld_safe, with the value set to such command line-only mysqld_safe option values as may be required. On platforms that use systemd, theMYSQLD_OPTS
value can be set in/etc/sysconfig/mysqld
with a line such as this:MYSQLD_OPTS=" --ledir=/mysqld_ledir --mysqld=my_wrapper "
The value of
MYSQLD_OPTS
can also include mysqld options for mysqld_safe to pass to mysqld. (Bug #24619033, Bug #82920)References: This issue is a regression of: Bug #24464380, Bug #24483092, Bug #25088048, Bug #25378439, Bug #25378565.
For
LOAD DATA
used to insert data into an updateable view, the check to verify whether a column is actually updatable was missing. (Bug #24595937)On Debian/Ubuntu platforms, the systemd startup script for MySQL ignored
datadir
settings in/etc/mysql/my.cnf
. (Bug #24517024, Bug #82709)A regular expression pattern match into a large string could result in a server exit due to memory allocation failure or integer overflow. (Bug #24449076, Bug #24449090)
An incorrect error was reported for
CREATE TABLE
statements with a large value for theCONNECTION
table option. The value is now limited to 1024 bytes. (Bug #24437124)-
MySQL now uses
readdir()
rather thanreaddir_r()
. The latter has been deprecated sinceglibc
2.24 and caused debug builds of MySQL and builds using GCC 6.1 to fail.Additionally, several problems resulting in GCC 6.1 compiler warnings were corrected. (Bug #23708395, Bug #24437737, Bug #82515, Bug #24459890, Bug #82583, Bug #25103242)
The
-DWITH_EDITLINE=system
CMake option failed with recent versions of theeditline
library. (Bug #23708332, Bug #25391997, Bug #84501)Grant tables with incorrect structure may cause problems in user management operations. As a consequence of the fix for this, for any operation that modifies a grant table, the server now checks whether the table has the expected structure and produces an error if not. mysql_upgrade must be run to update the tables to the expected structure. (Bug #23295423, Bug #25095876, Bug #25448037)
The
QUOTE()
function could allocate excessive memory. A limit ofmax_allowed_packet
bytes is now imposed and returnsNULL
with a warning for attempts to allocate more. (Bug #23195404)When attempting to locate the data directory, mysqld_safe incorrectly considered
$MY_BASEDIR_VERSION/var
as one of the possible locations. (Bug #23013510, Bug #80866)The
main.log_tables-big
test case could be unstable on highly loaded hosts. Thanks to Laurynas Biveinis for the patch. (Bug #22874167, Bug #80607)Queries that used an aggregate function with
DISTINCT
could produce incorrect results. (Bug #22686994, Bug #80310)With the
use_index_extensions
flag of theoptimizer_switch
system variable disabled, someSELECT DISTINCT
queries could return incorrect results. (Bug #21749123, Bug #78244)Debian packages were missing an AppArmor-related include file and incorrectly were marked dependent on AppArmor (making it impossible to disable AppArmor by uninstalling it). (Bug #20768958)
In a replication environment,
SET PASSWORD
orALTER USER
could fail to execute on the slave due to failure to parse the hash string correctly. (Bug #20228478)On non-Linux Unix systems, the mysql.server startup script used the Linux command pidof rather than pgrep. (Bug #13788154, Bug #64342)
Starting multiple instances of mysqld_safe after an abnormal server exit could result in one mysqld_safe instance killing another. As a consequence of the bug fix, the
mysqld_safe.pid
file is no longer used. (Bug #11751149, Bug #41908)The
--help
message for mysqld_safe was corrected to mention that the--no-defaults
,--defaults-file
, and--defaults-extra-file
options, if given, must be the first argument. (Bug #11745176, Bug #11192)-
The bounds check for the XML parser position stack for each level (which has a fixed depth) used the size of the array as the upper limit, and so was off by one. This is fixed by decreasing the allowable depth by one, which actually matches the maximum number of elements in the position stack. (Bug #83871, Bug #25111907)
References: See also: Bug #14040071, Bug #15948580.
Timestamps for server-side prepared statements could be written to the binary log up to a second behind timestamps for the corresponding nonprepared statements, leading to time value differences between master and slave servers. (Bug #74550, Bug #19894382, Bug #25187670)