committer: Marc Alff <marc.alff@oracle.com>
branch nick: mysql-5.6-bug17156507
timestamp: Tue 2013-07-23 15:08:32 +0200
message:
  Bug#17156507 SUCCESSFUL CONNECTION ATTEMPT DOESN'T RESET THE SUM_CONNECT_ERRORS COUNTER

(test case was merged with perfschema 5.6.17)

(only new files and small style changes are accepted)

include/mysql/psi/*

5.6 files

10.0 files

XtraDB 5.6.16-64.2

InnoDB 5.6.16

revno: 5716
committer: Praveenkumar Hulakund <praveenkumar.hulakund@oracle.com>
branch nick: mysql_5_6
timestamp: Sat 2013-12-28 22:08:40 +0530
message:
  Bug#17862905: MYSQLDUMP CREATES USELESS METADATA LOCKS

MDEV-6095 replicate- filters for slaves with a connection name that contain an underscore are ignored

Revert revision-id: guilhem@mysql.com-20091118203617-3jfudef971r7bf2y
Implement a non-destructive fix instead.

various places in the code.

the linker script.

correct the length encoding for the extra2 frm segment. add the comment.

            I_S table

mdl_iterate() helper function (which is used by the plugin to iterate mdl
locks) acquired mutexes in reverse order.

Fixed by iterating MDL locks in two stages:
1. Iterate locks hash under the protection of hash mutex, store all
   lock pointers in a thread local array and increment reference counter
   for the lock.
2. Iterate local array without protection of hash mutex, handle destroyed
   locks.

It somewhat echoes hack in MDL_map_partition::move_from_hash_to_lock_mutex.

- Use floating-point division in selectivity calculations.

The problem appeared when a loose scan used a key prefix whose
last component called uint3korr in the implementation of the key_cmp
virtual function.

- Testcase. The bug is fixed by commit for MDEV-6003

- Fix table_cond_selectivity() to work correctly for ref access 
  and "keypart2=const" case.

MDEV-5980: EITS: if condition is used for REF access, its selectivity is still in filtered%
MDEV-5985: EITS: selectivity estimates look illogical for join and non-key equalities
MDEV-6003: EITS: ref access, keypart2=const vs keypart2=expr - inconsistent filtered% value
- Made a number of fixes in table_cond_selectivity() so that it returns
  correct selectivity estimates.
- Added comments in related code.
Better comments

MDEV-5985: EITS: selectivity estimates look illogical for join and non-key equalities
MDEV-6003: EITS: ref access, keypart2=const vs keypart2=expr - inconsistent filtered% value
- Made a number of fixes in table_cond_selectivity() so that it returns
  correct selectivity estimates.
- Added comments in related code.

Added a test, the problem itself was fixed in MDEV-6068

The previous patch for this bug was unfortunately completely wrong.

The purpose of cached_charset is to remember which character set we
have installed currently in the THD, so that in the common case where
charset does not change between queries, we do not need to update it
in the THD. Thus, it is important that the cached_charset field is
tightly coupled to the THD for which it handles caching.

Thus the right place to put cached_charset seems to be in the THD.
This patch introduces a field THD:system_thread_info where such info
in general can be placed without further inflating the THD with unused
data for other threads (THD is already far too big as it is). It then
moves the cached_charset into this slot for the SQL driver thread and
for the parallel replication worker threads.

The THD::rpl_filter field is also moved inside system_thread_info, to
keep the size of THD unchanged. Moving further fields in to reduce the
size of THD is a separate task, filed as MDEV-6164.

The problem is the async binlog checkpointing; this could on rare
occasions occur too late, causing SHOW BINLOG EVENTS to show the
wrong events and cause .result file difference.