SECONDARY INDEX UPDATES MAKE CONSISTENT READS DO O(N^2) UNDO PAGE
LOOKUPS (honoring kill query while accessing sec_index)
If secondary index is being used for select query evaluation and this
query is operating with consistent read snapshot it might take good time for
secondary index to return back control to mysql as MVCC would kick in.
If user issues "kill query <id>" while query is actively accessing
secondary index it will not be honored as there is no hook to check
for this condition. Added hook for this check.
-----
Parallely secondary index taking too long to evaluate for consistent
read snapshot case is being examined for performance improvement. WL#6540.
SECONDARY INDEX UPDATES MAKE CONSISTENT READS DO O(N^2) UNDO PAGE
LOOKUPS (honoring kill query while accessing sec_index)
If secondary index is being used for select query evaluation and this
query is operating with consistent read snapshot it might take good time for
secondary index to return back control to mysql as MVCC would kick in.
If user issues "kill query <id>" while query is actively accessing
secondary index it will not be honored as there is no hook to check
for this condition. Added hook for this check.
-----
Parallely secondary index taking too long to evaluate for consistent
read snapshot case is being examined for performance improvement. WL#6540.
Fix by Sergey Petrunia.
This patch only prevents the evaluation of expensive subqueries during optimization.
The crash reported in this bug has been fixed by some other patch.
The fix is to call value->is_null() only when !value->is_expensive(), because is_null()
may trigger evaluation of the Item, which in turn triggers subquery evaluation if the
Item is a subquery.
.. into MariaDB 5.3
Fix for Bug#12667154 SAME QUERY EXEC AS WHERE SUBQ GIVES DIFFERENT
RESULTS ON IN() & NOT IN() COMP #3
This bug causes a wrong result in mysql-trunk when ICP is used
and bad performance in mysql-5.5 and mysql-trunk.
Using the query from bug report to explain what happens and causes
the wrong result from the query when ICP is enabled:
1. The t3 table contains four records. The outer query will read
these and for each of these it will execute the subquery.
2. Before the first execution of the subquery it will be optimized. In
this case the important is what happens to the first table t1:
-make_join_select() will call the range optimizer which decides
that t1 should be accessed using a range scan on the k1 index
It creates a QUICK_RANGE_SELECT object for this.
-As the last part of optimization the ICP code pushes the
condition down to the storage engine for table t1 on the k1 index.
This produces the following information in the explain for this table:
2 DEPENDENT SUBQUERY t1 range k1 k1 5 NULL 3 Using index condition; Using filesort
Note the use of filesort.
3. The first execution of the subquery does (among other things) due
to the need for sorting:
a. Call create_sort_index() which again will call find_all_keys():
b. find_all_keys() will read the required keys for all qualifying
rows from the storage engine. To do this it checks if it has a
quick-select for the table. It will use the quick-select for
reading records. In this case it will read four records from the
storage engine (based on the range criteria). The storage engine
will evaluate the pushed index condition for each record.
c. At the end of create_sort_index() there is code that cleans up a
lot of stuff on the join tab. One of the things that is cleaned
is the select object. The result of this is that the
quick-select object created in make_join_select is deleted.
4. The second execution of the subquery does the same as the first but
the result is different:
a. Call create_sort_index() which again will call find_all_keys()
(same as for the first execution)
b. find_all_keys() will read the keys from the storage engine. To
do this it checks if it has a quick-select for the table. Now
there is NO quick-select object(!) (since it was deleted in
step 3c). So find_all_keys defaults to read the table using a
table scan instead. So instead of reading the four relevant records
in the range it reads the entire table (6 records). It then
evaluates the table's condition (and here it goes wrong). Since
the entire condition has been pushed down to the storage engine
using ICP all 6 records qualify. (Note that the storage engine
will not evaluate the pushed index condition in this case since
it was pushed for the k1 index and now we do a table scan
without any index being used).
The result is that here we return six qualifying key values
instead of four due to not evaluating the table's condition.
c. As above.
5. The two last execution of the subquery will also produce wrong results
for the same reason.
Summary: The problem occurs due to all but the first executions of the
subquery is done as a table scan without evaluating the table's
condition (which is pushed to the storage engine on a different
index). This is caused by the create_sort_index() function deleting
the quick-select object that should have been used for executing the
subquery as a range scan.
Note that this bug in addition to causing wrong results also can
result in bad performance due to executing the subquery using a table
scan instead of a range scan. This is an issue in MySQL 5.5.
The fix for this problem is to avoid that the Quick-select-object that
the optimizer created is deleted when create_sort_index() is doing
clean-up of the join-tab. This will ensure that the quick-select
object and the corresponding pushed index condition will be available
and used by all following executions of the subquery.
PRIVILEGES
Description: (user,host) pair from security context is used
privilege checking at the time of granting or
revoking proxy privileges. This creates problem
when server is started with
--skip-name-resolve option because host will not
contain any value. Checks should be dependent on
consistent values regardless the way server is
started. Further, privilege check should use
(priv_user,priv_host) pair rather than values
obtained from inbound connection because
this pair represents the correct account context
obtained from mysql.user table.
CONSISTENT SNAPSHOT OPTION
A transaction is started with a consistent snapshot. After
the transaction is started new indexes are added to the
table. Now when we issue an update statement, the optimizer
chooses an index. When the index scan is being initialized
via ha_innobase::change_active_index(), InnoDB reports
the error code HA_ERR_TABLE_DEF_CHANGED, with message
stating that "insufficient history for index".
This error message is propagated up to the SQL layer. But
the my_error() api is never called. The statement level
diagnostics area is not updated with the correct error
status (it remains in Diagnostics_area::DA_EMPTY).
Hence the following check in the Protocol::end_statement()
fails.
516 case Diagnostics_area::DA_EMPTY:
517 default:
518 DBUG_ASSERT(0);
519 error= send_ok(thd->server_status, 0, 0, 0, NULL);
520 break;
The fix is to backport the fix of bugs 14365043, 11761652
and 11746399.
14365043 PROTOCOL::END_STATEMENT(): ASSERTION `0' FAILED
11761652 HA_RND_INIT() RESULT CODE NOT CHECKED
11746399 RETURN VALUES OF HA_INDEX_INIT() AND INDEX_INIT() IGNORED
rb://1227 approved by guilhem and mattiasj.
Check ability of index to be NULL as it made in MyISAM. UNIQUE with NULL could have several NULL entries so we have to continue even if ve have found a row.
In some rare cases when the value of the system variable join_buffer_size
was set to a number less than 256 the function JOIN_CACHE::set_constants
determined the size of an offset in the join buffer equal to 1 though
the minimal join buffer required more than 256 bytes. This could cause
a crash of the server when records from the join buffer were read.
The feature was backported from MySQL 5.6.
Some code was added to make commands as
SELECT * FROM ignored_db.t1;
CALL ignored_db.proc();
USE ignored_db;
to take that option into account.
per-file comments:
mysql-test/r/ignore_db_dirs_basic.result
test result added.
mysql-test/t/ignore_db_dirs_basic-master.opt
options for the test,
actually the set of --ignore-db-dir lines.
mysql-test/t/ignore_db_dirs_basic.test
test for the feature.
Same test from 5.6 was taken as a basis,
then tests for SELECT, CALL etc were added.
per-file comments:
sql/mysql_priv.h
MDEV-495 backport --ignore-db-dir.
interface for db_name_is_in_ignore_list() added.
sql/mysqld.cc
MDEV-495 backport --ignore-db-dir.
--ignore-db-dir handling.
sql/set_var.cc
MDEV-495 backport --ignore-db-dir.
the @@ignore_db_dirs variable added.
sql/sql_show.cc
MDEV-495 backport --ignore-db-dir.
check if the directory is ignored.
sql/sql_show.h
MDEV-495 backport --ignore-db-dir.
interface added for opt_ignored_db_dirs.
sql/table.cc
MDEV-495 backport --ignore-db-dir.
check if the directory is ignored.
-----------
After compiling from source, during make test I got the following error:
test main.loaddata failed with error
CURRENT_TEST: main.loaddata
mysqltest: At line 592: query 'LOAD DATA INFILE 'tmpp.txt' INTO TABLE t1
CHARACTER SET ucs2
(@b) SET a=REVERSE(@b)' failed: 1115: Unknown character set: 'ucs2'
I noticed other tests are skipped because of no ucs2
main.mix2_myisam_ucs2 [ skipped ] Test requires:'
have_ucs2'
Should main.loaddata be skipped if there is no ucs2
How To Repeat:
-------------
Run make test on compiled source that doesn't have ucs2
Suggested fix:
-------------
the failing piece of the test should be moved from mysql-test/t/loaddata.test to
mysql-test/t/ctype_ucs.test.
QUOTING IN REPLICATION
Problem: Misquoting or unquoted identifiers may lead to
incorrect statements to be logged to the binary log.
Fix: we use specialized functions to append quoted identifiers in
the statements generated by the server.
LP bug #1035225 / MySQL bug #66301: INSERT ... ON DUPLICATE KEY UPDATE +
innodb_autoinc_lock_mode=1 is broken
The problem was that when certain INSERT ... ON DUPLICATE KEY UPDATE
were executed concurrently on a table containing an AUTO_INCREMENT
column as a primary key, InnoDB would correctly reserve non-overlapping
AUTO_INCREMENT intervals for each statement, but when the server
encountered the first duplicate key error on the secondary key in one of
the statements and performed an UPDATE, it also updated the internal
AUTO_INCREMENT value to the one from the existing row that caused a
duplicate key error, even though the AUTO_INCREMENT value was not
specified explicitly in the UPDATE clause. It would then proceed with
using AUTO_INCREMENT values the range reserved previously by another
statement, causing duplicate key errors on the AUTO_INCREMENT column.
Fixed by changing write_record() to ensure that in case of a duplicate
key error the internal AUTO_INCREMENT counter is only updated when the
AUTO_INCREMENT value was explicitly updated by the UPDATE
clause. Otherwise it is restored to what it was before the duplicate key
error, as that value is unused and can be reused for subsequent
successfully inserted rows.
sql/sql_insert.cc:
Don't update next_insert_id to the value of a row found during ON DUPLICATE KEY UPDATE.
sql/sql_parse.cc:
Added DBUG_SYNC
sql/table.h:
Added next_number_field_updated flag to detect changing of auto increment fields.
Moved fields a bit to get bool fields after each other (better alignment)
create table t1 (a smallint primary key auto_increment);
insert into t1 values(32767);
insert into t1 values(NULL);
ERROR 1062 (23000): Duplicate entry '32767' for key 'PRIMARY
Now on always gets error HA_ERR_AUTOINC_RANGE=167 "Out of range value for column", independent of
store engine, SQL Mode or number of inserted rows. This is an unique error that is easier to test for in replication.
Another bug fix is that we now get an error when trying to insert a too big auto-generated value, even in non-strict mode.
Before one get insted the max column value inserted.
This patch also fixes some issues with inserting negative numbers in an auto-increment column.
Fixed the ER_DUP_ENTRY and HA_ERR_AUTOINC_ERANGE are compared the same between master and slave.
This ensures that replication works between an old server to a new slave for auto-increment overflow errors.
Added SQLSTATE errors for handler errors
Smaller bug fixes:
* Added warnings for duplicate key errors when using INSERT IGNORE
* Fixed bug when using --skip-log-bin followed by --log-bin, which did set log-bin to "0"
* Allow one to see how cmake is called by using --just-print --just-configure
BUILD/FINISH.sh:
--just-print --just-configure now shows how cmake would be invoked. Good for understanding parameters to cmake.
cmake/configure.pl:
--just-print --just-configure now shows how cmake would be invoked. Good for understanding parameters to cmake.
include/CMakeLists.txt:
Added handler_state.h
include/handler_state.h:
SQLSTATE for handler error messages.
Required for HA_ERR_AUTOINC_ERANGE, but solves also some other cases.
mysql-test/extra/binlog_tests/binlog.test:
Fixed old wrong behaviour
Added more tests
mysql-test/extra/binlog_tests/binlog_insert_delayed.test:
Reset binary log to only print what's necessary in show_binlog_events
mysql-test/extra/rpl_tests/rpl_auto_increment.test:
Update to new error codes
mysql-test/extra/rpl_tests/rpl_insert_delayed.test:
Ignore warnings as this depends on how the test is run
mysql-test/include/strict_autoinc.inc:
On now gets an error on overflow
mysql-test/r/auto_increment.result:
Update results after fixing error message
mysql-test/r/auto_increment_ranges_innodb.result:
Test new behaviour
mysql-test/r/auto_increment_ranges_myisam.result:
Test new behaviour
mysql-test/r/commit_1innodb.result:
Added warnings for duplicate key error
mysql-test/r/create.result:
Added warnings for duplicate key error
mysql-test/r/insert.result:
Added warnings for duplicate key error
mysql-test/r/insert_select.result:
Added warnings for duplicate key error
mysql-test/r/insert_update.result:
Added warnings for duplicate key error
mysql-test/r/mix2_myisam.result:
Added warnings for duplicate key error
mysql-test/r/myisam_mrr.result:
Added warnings for duplicate key error
mysql-test/r/null_key.result:
Added warnings for duplicate key error
mysql-test/r/replace.result:
Update to new error codes
mysql-test/r/strict_autoinc_1myisam.result:
Update to new error codes
mysql-test/r/strict_autoinc_2innodb.result:
Update to new error codes
mysql-test/r/strict_autoinc_3heap.result:
Update to new error codes
mysql-test/r/trigger.result:
Added warnings for duplicate key error
mysql-test/r/xtradb_mrr.result:
Added warnings for duplicate key error
mysql-test/suite/binlog/r/binlog_innodb_row.result:
Updated result
mysql-test/suite/binlog/r/binlog_row_binlog.result:
Out of range data for auto-increment is not inserted anymore
mysql-test/suite/binlog/r/binlog_statement_insert_delayed.result:
Updated result
mysql-test/suite/binlog/r/binlog_stm_binlog.result:
Out of range data for auto-increment is not inserted anymore
mysql-test/suite/binlog/r/binlog_unsafe.result:
Updated result
mysql-test/suite/innodb/r/innodb-autoinc.result:
Update to new error codes
mysql-test/suite/innodb/r/innodb-lock.result:
Updated results
mysql-test/suite/innodb/r/innodb.result:
Updated results
mysql-test/suite/innodb/r/innodb_bug56947.result:
Updated results
mysql-test/suite/innodb/r/innodb_mysql.result:
Updated results
mysql-test/suite/innodb/t/innodb-autoinc.test:
Update to new error codes
mysql-test/suite/maria/maria3.result:
Updated result
mysql-test/suite/maria/mrr.result:
Updated result
mysql-test/suite/optimizer_unfixed_bugs/r/bug43617.result:
Updated result
mysql-test/suite/rpl/r/rpl_auto_increment.result:
Update to new error codes
mysql-test/suite/rpl/r/rpl_insert_delayed,stmt.rdiff:
Updated results
mysql-test/suite/rpl/r/rpl_loaddatalocal.result:
Updated results
mysql-test/t/auto_increment.test:
Update to new error codes
mysql-test/t/auto_increment_ranges.inc:
Test new behaviour
mysql-test/t/auto_increment_ranges_innodb.test:
Test new behaviour
mysql-test/t/auto_increment_ranges_myisam.test:
Test new behaviour
mysql-test/t/replace.test:
Update to new error codes
mysys/my_getopt.c:
Fixed bug when using --skip-log-bin followed by --log-bin, which did set log-bin to "0"
sql/handler.cc:
Ignore negative values for signed auto-increment columns
Always give an error if we get an overflow for an auto-increment-column (instead of inserting the max value)
Ensure that the row number is correct for the out-of-range-value error message.
******
Fixed wrong printing of column namn for "Out of range value" errors
Fixed that INSERT_ID is correctly replicated also for out-of-range autoincrement values
Fixed that print_keydup_error() can also be used to generate warnings
******
Return HA_ERR_AUTOINC_ERANGE (167) instead of ER_WARN_DATA_OUT_OF_RANGE for auto-increment overflow
sql/handler.h:
Allow INSERT IGNORE to continue also after out-of-range inserts.
Fixed that print_keydup_error() can also be used to generate warnings
sql/log_event.cc:
Added DBUG_PRINT
Fixed the ER_AUTOINC_READ_FAILED, ER_DUP_ENTRY and HA_ERR_AUTOINC_ERANGE are compared the same between master and slave.
This ensures that replication works between an old server to a new slave for auto-increment overflow errors.
sql/sql_insert.cc:
Add warnings for duplicate key errors when using INSERT IGNORE
sql/sql_state.c:
Added handler errors
sql/sql_table.cc:
Update call to print_keydup_error()
storage/innobase/handler/ha_innodb.cc:
Fixed increment handling of auto-increment columns to be consistent with rest of MariaDB.
storage/xtradb/handler/ha_innodb.cc:
Fixed increment handling of auto-increment columns to be consistent with rest of MariaDB.
Analysis:
The queries in question use the [unique | index]_subquery execution methods.
These methods reuse the ref keys constructed by create_ref_for_key(). The
way create_ref_for_key() works is that it doesn't store in ref.key_copy[]
store_key elements that represent constants. In particular it doesn't store
the store_key for NULL constants.
The execution of [unique | index]_subquery calls
subselect_uniquesubquery_engine::copy_ref_key, which in addition to copy
the left IN argument into a index lookup key, is supposed to detect if
the left IN argument contains NULLs. Since the store_key for the NULL
constant is not copied into the key array, the null is not detected, and
execution erroneously proceeds as if it should look for a complete match.
Solution:
The solution (unlike MySQL) is to reuse already computed information about
NULL presence. Item_in_optimizer::val_int already finds out if the left IN
operand contains NULLs. The fix propagates this to the execution methods
subselect_[unique | index]subquery_engine::exec so it knows if there were
NULL values independent of the presence of keys.
In addition the patch siplifies copy_ref_key() and the logic that hanldes
the case of NULLs in the left IN operand.
mysql-test/suite/heap/heap_hash.result:
Added test case
mysql-test/suite/heap/heap_hash.test:
Added test case
storage/heap/hp_hash.c:
Limit key data length to max key length
-----------
After compiling from source, during make test I got the following error:
test main.loaddata failed with error
CURRENT_TEST: main.loaddata
mysqltest: At line 592: query 'LOAD DATA INFILE 'tmpp.txt' INTO TABLE t1
CHARACTER SET ucs2
(@b) SET a=REVERSE(@b)' failed: 1115: Unknown character set: 'ucs2'
I noticed other tests are skipped because of no ucs2
main.mix2_myisam_ucs2 [ skipped ] Test requires:'
have_ucs2'
Should main.loaddata be skipped if there is no ucs2
How To Repeat:
-------------
Run make test on compiled source that doesn't have ucs2
Suggested fix:
-------------
the failing piece of the test should be moved from mysql-test/t/loaddata.test to
mysql-test/t/ctype_ucs.test.
-----------
After compiling from source, during make test I got the following error:
test main.loaddata failed with error
CURRENT_TEST: main.loaddata
mysqltest: At line 592: query 'LOAD DATA INFILE 'tmpp.txt' INTO TABLE t1
CHARACTER SET ucs2
(@b) SET a=REVERSE(@b)' failed: 1115: Unknown character set: 'ucs2'
I noticed other tests are skipped because of no ucs2
main.mix2_myisam_ucs2 [ skipped ] Test requires:'
have_ucs2'
Should main.loaddata be skipped if there is no ucs2
How To Repeat:
-------------
Run make test on compiled source that doesn't have ucs2
Suggested fix:
-------------
the failing piece of the test should be moved from mysql-test/t/loaddata.test to
mysql-test/t/ctype_ucs.test.
feature_dynamic_columns,feature_fulltext,feature_gis,feature_locale,feature_subquery,feature_timezone,feature_trigger,feature_xml
Opened_views, Executed_triggers, Executed_events
Added new process status 'updating status' as part of 'freeing items'
mysql-test/r/features.result:
Test of feature_xxx status variables
mysql-test/r/mysqld--help.result:
Removed duplicated 'language' variable.
mysql-test/r/view.result:
Test of opened_views
mysql-test/suite/rpl/t/rpl_start_stop_slave.test:
Write more information on failure
mysql-test/t/features.test:
Test of feature_xxx status variables
mysql-test/t/view.test:
Test of opened_views
sql/event_scheduler.cc:
Increment executed_events status variable
sql/field.cc:
Increment status variable
sql/item_func.cc:
Increment status variable
sql/item_strfunc.cc:
Increment status variable
sql/item_subselect.cc:
Increment status variable
sql/item_xmlfunc.cc:
Increment status variable
sql/mysqld.cc:
Add new status variables to 'show status'
sql/mysqld.h:
Added executed_events
sql/sql_base.cc:
Increment status variable
sql/sql_class.h:
Add new status variables
sql/sql_parse.cc:
Added new process status 'updating status' as part of 'freeing items'
sql/sql_trigger.cc:
Increment status variable
sql/sys_vars.cc:
Increment status variable
sql/tztime.cc:
Increment status variable
Link view/derived table fields to a real table to check turning the table record to null row.
Item_direct_view_ref wrapper now checks if table is turned to null row.
Original patch by Eric Herman
client/mysql.cc:
Added LAST_VALUE
mysql-test/r/last_value.result:
Testing of LAST_VALUE
mysql-test/t/last_value.test:
Testing of LAST_VALUE
sql/item_func.cc:
Added LAST_VALUE()
sql/item_func.h:
Added LAST_VALUE()
sql/lex.h:
Added LAST_VALUE()
sql/sql_yacc.yy:
Added LAST_VALUE()
Autointersections of an object were treated as nodes, so the wrong result.
per-file comments:
mysql-test/r/gis.result
Bug #1043845 st_distance() results are incorrect depending on variable order.
test result updated.
mysql-test/t/gis.test
Bug #1043845 st_distance() results are incorrect depending on variable order.
test case added.
sql/item.cc
small fix to make compilers happy.
sql/item_geofunc.cc
Bug #1043845 st_distance() results are incorrect depending on variable order.
Skip intersection points when calculate distance.
