What's changing in MySQL 5.7, and how you can prepare yourself for the official release.

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MySQL
5.7:
Upcoming
Changes
Morgan
Tocker
MySQL
Community
Manager
February
2015

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Safe
Harbor
Statement
The
following
is
intended
to
outline
our
general
product
direction.
It
is
intended
for
information
purposes
only,
and
may
not
be
incorporated
into
any
contract.
It
is
not
a
commitment
to
deliver
any
material,
code,
or
functionality,
and
should
not
be
relied
upon
in
making
purchasing
decisions.
The
development,
release,
and
timing
of
any
features
or
functionality
described
for
Oracle’s
products
remains
at
the
sole
discretion
of
Oracle.
3

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4
Today’s
Agenda
Introduction
New
Features
Changes
to
Prepare
For
1
2
3

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MySQL
5.7
-­‐
The
Team
• 2x
Engineering
Staff
• 3x
QA
Staff
• 2x
Support
Staff
5
Jan
2010 Sept
2014

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Development
Milestone
Releases
• Features
are
merged
into
main
branch
only
when
stable.
• High
level
review
complete.
• Low
level
review
complete.
• 80%+
code
coverage
testing
goal.
• DMRs
are
intended
to
be
of
“Release
Candidate”
Quality.
6

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Labs
Releases
• Features
have
not
passed
qualification.
• We
are
releasing
an
experiment
because
we
want
to
insert
an
extra
feedback
cycle.
• Current
Labs
Releases:
• New
Data
Dictionary
• Optimizer/InnoDB/Replication
• HTTP
Plugin
• Group
Replication
7

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MySQL
5.7
DMR
Schedule
8
April 2013
DMR1
221 Bugs Fixed
29 Changes
21 Worklogs
Sep 2013
DMR2
384 Bugs Fixed
41 Changes
52 Worklogs
Dec 2013
DMR3
155 Bugs Fixed
23 Changes
27 Worklogs
April 2014
DMR4
259 Bugs Fixed
38 Changes
56 Worklogs
5.6 GA
Feb 2013
Sept 2014
DMR5
300 Bugs Fixed
50 Changes
79 Worklogs

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Model
Successful
in
5.6
9
https://www.flamingspork.com/blog/2013/03/05/mysql-code-size/
Also See:
http://www.mysqlperformanceblog.com/2013/01/27/mysql-5-6-improvements-in-the-nutshell/

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10
Today’s
Agenda
Introduction
New
Features
Changes
to
Prepare
For
1
2
3
2
1

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Common
Themes
11
From
DMR0
to
DMR5
▪ Improved support for high
connection creation rate
▪ Lock Thread count impact reduced
▪Multiple Metadata Locking (MDL)
improvements
▪ Parallel Replication (Intra-schema)
▪ Additional query optimization for
Fulltext Search
▪ Make use of condition filtering in the
optimizer
▪ InnoDB Improvements for:
▪ Index lock contention
▪ Read Only Transactions
▪ Temporary Tables
▪ Redo Logs
▪ Multiple page cleaner threads.
▪ Scalability
▪ Bulk Loading Indexes
Performance & Scalability

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Common
Themes
12
From
DMR0
to
DMR5
▪ Overhead has been reduced.
▪ Improved to do lazy initialization on
new connections.
▪ Now instruments:
▪ Memory usage
▪ Stored programs
▪ Replication
▪ Metadata Locking (MDL)
▪ Transactions
▪ Prepared Statements
▪ User Variables
▪ Stage Progress
▪ SX-lock
Performance Schema
▪ Password expiration support +
timestamp of password last changed.
▪ mysql_secure_installation changed
to C++ program.
▪ Improvements to SSL Support.
▪ Support to change AES key length
and block encryption mode
Security

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Common
Themes
(cont.)
13
From
DMR0
to
DMR5
▪Internal logging API
▪Timestamps are now written with log
entries in YYYY-MM-
DDThh:mm:ss.uuuuuu format.
▪Configurable Verbosity
▪InnoDB Refactored:
▪Locking Code
▪Redo Log Code (for performance)
▪Tablespace Class
▪Atomics refactored
▪Optimizer refactoring (multiple
improvements)
▪Optimizer cost model
▪mysql_install_db changed to C++ program.
▪Strict and Ignore defined and
reimplemented.
▪Remove custom rwlock windows
implementation
▪Refactor strings: use of (const char *) in
THD
▪Using Boot.Geometry
▪Better ONLY_FULL_GROUP_BY mode
▪Refactor mysql_upgrade
▪Move system tables from MyISAM to
transactional storage
▪Make sure that when 32-bit connection-IDs
roll over, still in-use IDs are not re-issued
▪Memroot allocator for C++ STL
Refactoring

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Benchmarks
14
http://dimitrik.free.fr/blog/archives/2014/10/indeed-­‐mysql-­‐57-­‐rocks-­‐oltp_rorw-­‐1table-­‐benchmarks.html

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Benchmarks
(cont.)
• 645K
Queries/Second
is
the
new
peak.
15
http://dimitrik.free.fr/blog/archives/2014/09/indeed-­‐mysql-­‐57-­‐rocks-­‐oltp_ro-­‐pointselects-­‐8tables-­‐benchmark.html

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DMR0
• Error
issued
when
creating
duplicate
index.
• Warning
when
strict
SQL
Mode
removed.
• Ctl-­‐C
fixed
in
MySQL
CLI!
• Non-­‐blocking
SHOW
SLAVE
STATUS
• Idempotent
mysqlbinlog
mode.
• Stacked
Diagnostics
Area
16
Internal
Release
Only

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DMR1
• Online
DDL
Now
supports
RENAME
INDEX
and
VARCHAR
extensions.
• InnoDB
support
for
Spatial
Data
Types.
• Rewrite-­‐db
option
for
mysqlbinlog
with
RBR.
17
Released
April
2013

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DMR2
• Semi
sync
replication
improvements.
• Multiple
Triggers
per
event
per
table.
• EXPLAIN
FOR
CONNECTION
• EXPLAIN
showing
cost
information.
18
Released
September
2013

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Example:
Cost
Information
in
EXPLAIN
19
EXPLAIN
FORMAT=JSON
FOR
CONNECTION
2;
*************************** 1. row ***************************
EXPLAIN: {
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "4786.00"
},
"ordering_operation": {
"using_temporary_table": true,
"using_filesort": true,
"cost_info": {
"sort_cost": "2151.00"
},
"nested_loop": [
{
"table": {
..
],
"key_length": "3",
"rows_examined_per_scan": 239,
"rows_produced_per_join": 239,
"filtered": 100,
"using_index": true,
"cost_info": {
"read_cost": "6.00",
"eval_cost": "47.80",
"prefix_cost": "53.80",
"data_read_per_join": "61K"
},
..

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Example:
EXPLAIN
in
MySQL
Workbench
20
Visual
EXPLAIN
Including
Cost
Information!

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DMR3
• UNION
ALL
no
longer
requires
temporary
table.
• Filesort
now
packs
VARCHAR
and
CHAR
keys
in
temporary
files.
• Optimizer
Support
for
row
value
constructors.
• i.e.
WHERE
(a,b)
in
((‘a’,
‘b’),
(‘c’,
‘d’));
21
Released
December
2013

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DMR3
(cont.)
• InnoDB
Fulltext
now
supports
external
parsers.
• Dynamic
replication
filters.
• Support
ICP
optimization
for
partitioned
tables.
22

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UNION
ALL
Optimization
23
***************** 1. row *****************
id: 1
select_type: PRIMARY
table: table_a
type: ALL
possible_keys: NULL
key: NULL
key_len: NULL
ref: NULL
rows: 3
Extra: NULL
***************** 2. row *****************
id: 2
select_type: UNION
table: table_b
type: ALL
possible_keys: NULL
key: NULL
key_len: NULL
ref: NULL
rows: 3
Extra: NULL
***************** 3. row *****************
id: NULL
select_type: UNION RESULT
table: <union1,2>
type: ALL
possible_keys: NULL
key: NULL
key_len: NULL
ref: NULL
rows: NULL
Extra: Using temporary
***************** 1. row *****************
id: 1
select_type: PRIMARY
table: table_a
partitions: NULL
type: ALL
possible_keys: NULL
key: NULL
key_len: NULL
ref: NULL
rows: 3
filtered: 100.00
Extra: NULL
***************** 2. row *****************
id: 2
select_type: UNION
table: table_b
partitions: NULL
type: ALL
possible_keys: NULL
key: NULL
key_len: NULL
ref: NULL
rows: 3
filtered: 100.00
Extra: NULL
EXPLAIN SELECT * FROM a UNION ALL SELECT * FROM b
MySQL 5.6: MySQL 5.7:

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Row-­‐value
Constructors
24
EXPLAIN SELECT * FROM City WHERE (CountryCode,Name) IN (('USA', 'San
Francisco'), ('USA', 'Chicago'), ('CAN', ‘Toronto'))
**************** 1. row ****************
id: 1
select_type: SIMPLE
table: City
type: ALL
possible_keys: NULL
key: NULL
key_len: NULL
ref: NULL
rows: 4188
Extra: Using where
1 row in set (0.00 sec)
**************** 1. row ****************
id: 1
select_type: SIMPLE
table: City
partitions: NULL
type: range
possible_keys: CountryCode,CountryCode$Name
key: CountryCode$Name
key_len: 38
ref: NULL
rows: 3
filtered: 100.00
Extra: Using where
MySQL 5.6: MySQL 5.7:

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DMR4
• Statement
Timeout.
• Change
master
without
stopping
SQL
thread.
• Transportable
tablespaces
for
partitioned
InnoDB
tables.
25
Released
April
2014

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Server-­‐Side
Statement
Timeout
• SELECT
MAX_STATEMENT_TIME
=
109
*
FROM
my_table;
• SET
SESSION
MAX_STATEMENT_TIME
=
100;
• SET
GLOBAL
MAX_STATEMENT_TIME
=
100;
26
Incorporates
Contributions
from
Davi
Arnaut,
the
MySQL
Community

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DMR5
• Online
UNDO
log
truncation
• Online
Buffer
Pool
Resize
• Partitioning
Enhancements
• InnoDB
GIS
support
• Support
InnoDB
as
additional
storage
engine
for
tmp
table
• Method
to
bring
servers
offline
27
Released
September
2014

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DMR5
(cont.)
• Native
support
for
syslog
• Allow
multiple
locks
in
GET_LOCK()
• Improve
dtrace
support
on
Oracle
Linux
6
• New
Optimizer
Cost
Model
28
Released
September
2014

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Offline
Mode
29
mysql> select * from a;
+----+
| id |
+----+
| 2 |
| 2 |
| 3 |
+----+
3 rows in set (0.00 sec)
mysql> select * from a;
No connection. Trying to reconnect...
ERROR 1917 (HY000): The server is
currently in offline mode
ERROR:
Can't connect to the server
mysql> set global offline_mode = 1;
Query OK, 0 rows affected (0.01 sec)
Session #1 Session #2

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Online
Buffer
Pool
Resize
30
mysql> SET GLOBAL innodb_buffer_pool_size = 256 * 1024 * 1024;
Query OK, 0 rows affected (0.00 sec)
mysql> SHOW GLOBAL STATUS LIKE 'Innodb_buffer_pool_resize_status'G
*************************** 1. row ***************************
Variable_name: Innodb_buffer_pool_resize_status
Value: Completed resizing buffer pool at 141107 16:33:12.
1 row in set (0.00 sec)
mysql> SHOW GLOBAL VARIABLES LIKE 'innodb_buffer_pool_size';
+-------------------------+-----------+
| Variable_name | Value |
+-------------------------+-----------+
| innodb_buffer_pool_size | 268435456 |
+-------------------------+-----------+
1 row in set (0.00 sec)

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DMR6
• Release
notes
starting
to
show
features
• Fulltext
support
for
CJK
• MySQL
Install
DB
folded
into
server
• More
improvements
in
optimizer,
performance
schema,
InnoDB.
31
Not
Yet
Released

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32
Today’s
Agenda
Introduction
New
Features
Changes
to
Prepare
For
1
22
1
2
3

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• Change
of
Defaults
• Command
Line
Client
• Replication
• InnoDB
• Optimizer
• Errors,
Warning
and
Logging
• Performance
Schema
• SQL
Modes
• Other
• Deprecation
• ENCODE/DECODE
functions
• SHOW
PROFILES
33
Functionality
Changed
• Behaviour
Change
• STRICT
• ONLY_FULL_GROUP_BY
• IGNORE
• DELAYED
• EXPLAIN
• Removal
• SHOW
ENGINE
INNODB
MUTEX
• InnoDB
Monitor
Tables
• ALTER
IGNORE
TABLE
• Unused
CLI
Utilities
• YEAR(2)
support
• Old
Passwords

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Behaviour
is
different,
but
previous
behaviour
can
be
restored.
Change
of
Defaults
34

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Command
Line
Client
• Two
small
changes
to
improve
default
experience:
35
[mysql]
prompt="u@h [d] > “
show_warnings

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Replication
• Safer
by
default.
• Reduces
timeouts,
which
are
now
also
used
for
server
heartbeats.
36
[mysqld]
sync_binlog=1
binlog_format=ROW
slave_net_timeout=60
binlog_error_action=ABORT_SERVER
binlog_gtid_recovery_simplified=1

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InnoDB
37
[mysqld]
innodb_autoinc_lock_mode=2
innodb_checksum_algorithm=crc32
innodb_page_cleaners=4
innodb_purge_threads=4
innodb_strict_mode=1
innodb_log_file_size=128M
innodb_buffer_pool_dump_at_shutdown=1
innodb_buffer_pool_load_at_startup=1
innodb_buffer_pool_dump_pct=25
innodb_file_format = Barracuda
innodb_large_prefix=1

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Optimizer
• New
Optimizations
Enabled
by
Default
• Setting
for
ranged
queries
to
use
statistics
over
sampling
changed
in
response
to
feedback
38
[mysqld]
eq_range_index_dive_limit=200

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Errors,
Warnings
&
Logging
39
[mysqld]
log_slow_admin_statements=1
log_slow_slave_statements=1
long-query-time=2
log-queries-not-using-indexes=1
min-examined-row-limit=1000
log_warnings=2

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Performance
Schema
• performance-­‐schema-­‐consumer-­‐events_statements_history=ON
• performance-­‐schema-­‐consumer-­‐events_transactions_history=ON
40

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SQL
Modes
• Fewer
surprises
caused
by
how
edge
cases
are
handled:
• Very
good
for
new
applications
• May
need
to
be
disabled
for
those
upgrading*
41
[mysqld]
sql-mode=“ONLY_FULL_GROUP_BY,
STRICT_TRANS_TABLES,
NO_ENGINE_SUBSTITUTION,
NO_AUTO_CREATE_USER"
* http://www.tocker.ca/2014/09/01/suggestions-­‐for-­‐transitioning-­‐into-­‐strict-­‐sql-­‐mode.html

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SQL
Modes
(cont.)
42
mysql> SELECT id, invoice_id, description
FROM invoice_line_items GROUP BY invoice_id;
+----+------------+-------------+
| id | invoice_id | description |
+----+------------+-------------+
| 1 | 1 | New socks |
| 3 | 2 | Shoes |
| 5 | 3 | Tie |
+----+------------+-------------+
3 rows in set (0.00 sec)
ERROR
1055
(42000):
Expression
#3
of
SELECT
list
is
not
in
GROUP
BY
clause
and
contains
nonaggregated
column
‘invoice_line_items.description’
which
is
not
functionally
dependent
on
columns
in
GROUP
BY
clause;
this
is
incompatible
with
sql_mode=only_full_group_by
Only
full
group
by

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SQL
Modes
(cont.)
43
STRICT
for
transactional
tables
CREATE TABLE test (a int unsigned);
INSERT INTO test VALUES (-1);
ERROR 1264 (22003): Out of range value for column 'a' at row 1
insert into test values (0/0);
ERROR 1365 (22012): Division by 0
CREATE TABLE test2 (a varchar(10));
INSERT INTO test2 VALUES ('abcdefghijklmnopqrstuvwxyz');
ERROR 1406 (22001): Data too long for column 'a' at row 1
CREATE TABLE test3 (a datetime);
INSERT INTO test3 VALUES ('0000-00-00 00:00:00');
ERROR 1292 (22007): Incorrect datetime value: '0000-00-00
00:00:00' for column 'a' at row 1

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Other
44
[mysqld]
# default buffer sizes
group_concat_max_len=1M
max_allowed_packet=64M
# security
symbolic-links=0

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Still
present,
but
usage
is
now
discouraged.
Deprecated
45

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ENCODE/DECODE
Functions
46
mysql> SELECT HEX(ENCODE('MyPassword', 'Super Secret!'));
+--------------------------------------------+
| HEX(ENCODE('MyPassword', 'Super Secret!')) |
+--------------------------------------------+
| A0E844F97A48FE6E8C1F |
+--------------------------------------------+
mysql> SELECT DECODE(UNHEX('A0E844F97A48FE6E8C1F'), 'Super Secret!');
+--------------------------------------------------------+
| DECODE(UNHEX('A0E844F97A48FE6E8C1F'), 'Super Secret!') |
+--------------------------------------------------------+
| MyPassword |
+--------------------------------------------------------+
mysql> show warningsG
*************************** 1. row ***************************
Level: Warning
Code: 1287
Message: 'ENCODE' is deprecated and will be removed in a future release.
Please use AES_ENCRYPT instead
1 row in set (0.01 sec)

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ENCODE/DECODE
Functions
(cont.)
• Functions
are
cryptographically
weak.
• For
crypto
to
be
upgraded,
storage
format
would
become
incompatible.
• Overlaps
with
similar
AES
functionality
already
present.
47

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SHOW
PROFILES
48
mysql> set profiling=1;
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> show profiles;
+----------+------------+-------------------------------------------------------+
| Query_ID | Duration | Query |
+----------+------------+-------------------------------------------------------+
| 1 | 0.00039200 | SELECT * FROM table_a UNION ALL SELECT * FROM table_b |
+----------+------------+-------------------------------------------------------+
2 rows in set, 1 warning (0.01 sec)
Including
Information_schema.profiling
table.

49. Copyright
©
2015
Oracle
and/or
its
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rights
reserved.
|
SHOW
PROFILES
(cont.)
49
mysql> show profile for query 1;
+----------------------+----------+
| Status | Duration |
+----------------------+----------+
| starting | 0.000059 |
| checking permissions | 0.000005 |
| checking permissions | 0.000005 |
| Opening tables | 0.000091 |
| System lock | 0.000011 |
| optimizing | 0.000004 |
| statistics | 0.000012 |
| preparing | 0.000009 |
| optimizing | 0.000002 |
| statistics | 0.000005 |
| preparing | 0.000004 |
| executing | 0.000003 |
| Sending data | 0.000053 |
| executing | 0.000002 |
..
..
| Sending data | 0.000029 |
| optimizing | 0.000006 |
| statistics | 0.000006 |
| preparing | 0.000004 |
| executing | 0.000002 |
| Sending data | 0.000019 |
| removing tmp table | 0.000007 |
| Sending data | 0.000002 |
| query end | 0.000007 |
| closing tables | 0.000010 |
| freeing items | 0.000019 |
| cleaning up | 0.000016 |
+----------------------+----------+
26 rows in set, 1 warning (0.00 sec)

50. Copyright
©
2015
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rights
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|
SHOW
PROFILES
(cont.)
• Overlaps
with
Performance
Schema
interface.
• Performance
Schema
has
more
flexible
configuration
• Instrumentation
level
can
be
increased/lowered
to
reduce
overhead.
• Performance
Schema
has
more
data
available.
50

51. Copyright
©
2015
Oracle
and/or
its
affiliates.
All
rights
reserved.
|
Existing
syntax
works,
server
may
respond
differently.
Change
of
Behaviour
51

52. Copyright
©
2015
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its
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rights
reserved.
|
STRICT
SQL_MODE
• Some
other
SQL
Modes
have
been
merged
into
the
definition
of
STRICT_TRANS_TABLES
and
STRICT_ALL_TABLES:
• These
options
are
ERROR_FOR_DIVISION_BY_ZERO,
NO_ZERO_DATE
and
NO_ZERO_IN_DATE.
• The
feature
has
also
been
reimplemented
internally.
Previous
behaviour
was
not
always
consistent
with
all
syntax.
52

53. Copyright
©
2015
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its
affiliates.
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rights
reserved.
|
SQL
Mode
ONLY_FULL_GROUP_BY
• Has
been
reimplemented.
• Now
more
standards
compliant,
and
allows
“functional
dependencies”
53

54. Copyright
©
2015
Oracle
and/or
its
affiliates.
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rights
reserved.
|
IGNORE
• Reimplemented,
motivated
by
code
cleanup.
• Similar
to
strict:
• Some
behaviour
changed
to
be
more
consistent
between
statements.
54

55. Copyright
©
2015
Oracle
and/or
its
affiliates.
All
rights
reserved.
|
DELAYED
• Usage
was
deprecated
in
5.6.
• Syntax
has
been
kept
but
functionality
has
now
been
removed.
i.e.
identical
behaviour:
• INSERT
DELAYED
INTO
my_table
(..)
VALUES
(..);
• INSERT
INTO
my_table
(..)
VALUES
(..);
55

56. Copyright
©
2015
Oracle
and/or
its
affiliates.
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rights
reserved.
|
DELAYED
(cont.)
• How
do
you
handle
delayed
statements
that
violate
UNIQUE
constraints?
• Offers
little
measurable
benefit
to
a
row-­‐level
locking
store
with
MVCC.
• Act
of
delaying
may
actually
incur
more
overhead.
56

57. Copyright
©
2015
Oracle
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rights
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|
EXPLAIN
• Previously
could
have
optional
modifiers:
• EXPLAIN
EXTENDED
• EXPLAIN
PARTITIONS
• These
modifiers
are
now
always
enabled.
• Motivated
by
simplification
and
code-­‐cleanup
(meta
data
only
adds
value).
57

58. Copyright
©
2015
Oracle
and/or
its
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rights
reserved.
|
EXPLAIN
(cont.)
58
mysql> EXPLAIN SELECT * FROM table_aG
********************** 1. row **********************
id: 1
select_type: PRIMARY
table: table_a
partitions: NULL
type: ALL
possible_keys: NULL
key: NULL
key_len: NULL
ref: NULL
rows: 3
filtered: 100.00
Extra: NULL
2 rows in set, 1 warning (0.00 sec)

59. Copyright
©
2015
Oracle
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All
rights
reserved.
|
Functionality
that
will
no
longer
be
supported
Removed
59

60. Copyright
©
2015
Oracle
and/or
its
affiliates.
All
rights
reserved.
|
SHOW
ENGINE
INNODB
MUTEX
60
mysql> show engine innodb mutex;
+--------+----------------------------+-------------------+
| Type | Name | Status |
+--------+----------------------------+-------------------+
| InnoDB | log/log0log.c:775 | os_waits=26 |
| InnoDB | log/log0log.c:771 | os_waits=1 |
| InnoDB | buf/buf0buf.c:1208 | os_waits=3219 |
| InnoDB | buf/buf0buf.c:1208 | os_waits=6990 |
| InnoDB | buf/buf0buf.c:1208 | os_waits=4619 |
| InnoDB | buf/buf0buf.c:1208 | os_waits=5627 |
..
| InnoDB | buf/buf0buf.c:1208 | os_waits=387166 |
| InnoDB | fil/fil0fil.c:1559 | os_waits=1265 |
| InnoDB | srv/srv0srv.c:987 | os_waits=460452 |
| InnoDB | combined buf/buf0buf.c:900 | os_waits=38503 |
| InnoDB | log/log0log.c:832 | os_waits=184 |
| InnoDB | combined buf/buf0buf.c:901 | os_waits=77 |
+--------+----------------------------+-------------------+
23 rows in set (0.56 sec)

61. Copyright
©
2015
Oracle
and/or
its
affiliates.
All
rights
reserved.
|
SHOW
ENGINE
INNODB
MUTEX
(cont.)
• Overlaps
with
PS.
• Can
not
be
disabled.
• Code
refactored
so
that
InnoDB
can
use
different
locks
internally.
61

62. Copyright
©
2015
Oracle
and/or
its
affiliates.
All
rights
reserved.
|
InnoDB
Monitor
Tables
• Existed
in
a
time
when
information_schema
did
not.
• Usage
was:
62
CREATE TABLE innodb_monitor (a INT) ENGINE=INNODB;
/* view to the error log */
DROP TABLE innodb_monitor;

63. Copyright
©
2015
Oracle
and/or
its
affiliates.
All
rights
reserved.
|
InnoDB
Monitor
Tables
(cont.)
• To
be
removed:
• innodb_tablespace_monitor
• innodb_table_monitor
• innodb_mem_validate
• To
be
replaced
by
config
setting:
• innodb_monitor
• innodb_lock_monitor
63

64. Copyright
©
2015
Oracle
and/or
its
affiliates.
All
rights
reserved.
|
ALTER
IGNORE
TABLE
64
mysql> CREATE TABLE a (id INT NOT NULL);
Query OK, 0 rows affected (0.02 sec)
mysql> INSERT INTO a VALUES (2), (2), (3);
Query OK, 3 rows affected (0.01 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql> ALTER TABLE a ADD PRIMARY KEY (id);
ERROR 1062 (23000): Duplicate entry '2' for key
'PRIMARY'

65. Copyright
©
2015
Oracle
and/or
its
affiliates.
All
rights
reserved.
|
ALTER
IGNORE
TABLE
(cont.)
65
mysql> ALTER IGNORE TABLE a ADD PRIMARY KEY (id);
Query OK, 3 rows affected (0.01 sec)
Records: 3 Duplicates: 1 Warnings: 0
mysql> SELECT * FROM a;
+----+
| id |
+----+
| 2 |
| 3 |
+----+
2 rows in set (0.00 sec)

66. Copyright
©
2015
Oracle
and/or
its
affiliates.
All
rights
reserved.
|
ALTER
IGNORE
TABLE
(cont.)
• Will
silently
drop
rows
for
you!
• Semantically
may
even
drop
different
rows
on
slaves.
• We
would
prefer
users
to
build
a
query
to
drop
the
rows
themselves
and
not
offer
this
functionality:
66
mysql> SELECT * FROM a GROUP BY id HAVING
count(*) > 1;
+----+
| id |
+----+
| 2 |
+----+
1 row in set (0.01 sec)

67. Copyright
©
2015
Oracle
and/or
its
affiliates.
All
rights
reserved.
|
Removal
of
CLI
Programs
• msql2mysql
[Shell
Script]
• mysqlaccess
[Perl
program]
• mysqlbug
[Shell
script]
• mysql_zap
[Shell
script]
• mysql_waitpid
[C
program]
• mysql_convert_table_format
[Perl
Program]
• mysql_fix_extensions
[Perl
Program]
• mysql_find_rows
[Perl
Program]
• mysql_setpermission
[Perl
Program]
• mysqlhotcopy
[Perl
Program]
67

68. Copyright
©
2015
Oracle
and/or
its
affiliates.
All
rights
reserved.
|
Removal
Example:
mysqlhotcopy
• Only
works
for
MyISAM
and
ARCHIVE
tables.
• Is
not
a
hot
copy.
• Unsafe
with
backing
up
views.
• Removed
to
prevent
users
doing
dangerous
things.
68

69. Copyright
©
2015
Oracle
and/or
its
affiliates.
All
rights
reserved.
|
Removal
Example:
msql2mysql
• Allows
you
to
import
tables
from
the
mysql
database.
• Useful
20
years
ago.
• No
longer
required.
69

70. Copyright
©
2015
Oracle
and/or
its
affiliates.
All
rights
reserved.
|
YEAR(2)
• Ambiguous!
70
mysql> CREATE TABLE a (a year(2));
mysql> INSERT INTO a VALUES (20), (90);
mysql> SELECT * FROM a;
+------+
| a |
+------+
| 2020 |
| 1990 |
+------+
2 rows in set (0.00 sec)

71. Copyright
©
2015
Oracle
and/or
its
affiliates.
All
rights
reserved.
|
Removal
of
Old
Password
Support
• MySQL
password
hash
prior
to
4.1
uses
weak
crypto.
• 16-­‐byte
hash
• New
format
has
been
available
for
10
years
(2004).
• Will
require
client
libraries
to
be
upgraded
as
well.
• PHP’s
mysql_*
extension
71

72. Copyright
©
2015
Oracle
and/or
its
affiliates.
All
rights
reserved.
|
How
to
prepare?
• Try
MySQL
5.7
defaults
out
now:
• https://github.com/morgo/mysql-­‐compatibility-­‐config
72

73. Copyright
©
2015
Oracle
and/or
its
affiliates.
All
rights
reserved.
|
We
want
your
feedback!
• We
blog
about
our
change
proposals
• Feedback
has
been
great:
• SET
GLOBAL
sql_log_bin
-­‐
32
Comments
• System
tables
in
InnoDB
-­‐
15
comments
• Changes
to
user
management
-­‐
10
comments
• Deprecate
the
old
password
format
-­‐
6
comments
• Still
opportunities
for
more
feedback
• Subscribe
your
RSS
reader
to:
http://planet.mysql.com/
73

74. Copyright
©
2014
Oracle
and/or
its
affiliates.
All
rights
reserved.
|
74