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mariadb/mysql-test/main/information_schema_all_engines.result
Varun Gupta be8709eb7b MDEV-6111 Optimizer Trace 
This task involves the implementation for the optimizer trace.

This feature produces a trace for any SELECT/UPDATE/DELETE/,
which contains information about decisions taken by the optimizer during
the optimization phase (choice of table access method, various costs,
transformations, etc). This feature would help to tell why some decisions were
taken by the optimizer and why some were rejected.

Trace is session-local, controlled by the @@optimizer_trace variable.
To enable optimizer trace we need to write:
   set @@optimizer_trace variable= 'enabled=on';

To display the trace one can run:
   SELECT trace FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;

This task also involves:
    MDEV-18489: Limit the memory used by the optimizer trace
    introduces a switch optimizer_trace_max_mem_size which limits
    the memory used by the optimizer trace. This was implemented by
    Sergei Petrunia.
2019-02-13 11:52:36 +05:30

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use INFORMATION_SCHEMA;
show tables;
Tables_in_information_schema
ALL_PLUGINS
APPLICABLE_ROLES
CHARACTER_SETS
CHECK_CONSTRAINTS
CLIENT_STATISTICS
COLLATIONS
COLLATION_CHARACTER_SET_APPLICABILITY
COLUMNS
COLUMN_PRIVILEGES
ENABLED_ROLES
ENGINES
EVENTS
FILES
GEOMETRY_COLUMNS
GLOBAL_STATUS
GLOBAL_VARIABLES
INDEX_STATISTICS
INNODB_BUFFER_PAGE
INNODB_BUFFER_PAGE_LRU
INNODB_BUFFER_POOL_STATS
INNODB_CMP
INNODB_CMPMEM
INNODB_CMPMEM_RESET
INNODB_CMP_PER_INDEX
INNODB_CMP_RESET
INNODB_LOCKS
INNODB_LOCK_WAITS
INNODB_METRICS
INNODB_MUTEXES
INNODB_SYS_COLUMNS
INNODB_SYS_FIELDS
INNODB_SYS_FOREIGN
INNODB_SYS_FOREIGN_COLS
INNODB_SYS_INDEXES
INNODB_SYS_TABLES
INNODB_SYS_TABLESTATS
INNODB_SYS_VIRTUAL
INNODB_TABLESPACES_ENCRYPTION
INNODB_TABLESPACES_SCRUBBING
INNODB_TRX
KEY_CACHES
KEY_COLUMN_USAGE
OPTIMIZER_TRACE
PARAMETERS
PARTITIONS
PLUGINS
PROCESSLIST
PROFILING
REFERENTIAL_CONSTRAINTS
ROUTINES
SCHEMATA
SCHEMA_PRIVILEGES
SESSION_STATUS
SESSION_VARIABLES
SPATIAL_REF_SYS
STATISTICS
SYSTEM_VARIABLES
TABLES
TABLESPACES
TABLE_CONSTRAINTS
TABLE_PRIVILEGES
TABLE_STATISTICS
TRIGGERS
USER_PRIVILEGES
USER_STATISTICS
VIEWS
SELECT t.table_name, c1.column_name
FROM information_schema.tables t
INNER JOIN
information_schema.columns c1
ON t.table_schema = c1.table_schema AND
t.table_name = c1.table_name
WHERE t.table_schema = 'information_schema' AND
c1.ordinal_position =
( SELECT COALESCE(MIN(c2.ordinal_position),1)
FROM information_schema.columns c2
WHERE c2.table_schema = t.table_schema AND
c2.table_name = t.table_name AND
c2.column_name LIKE '%SCHEMA%'
) order by t.table_name;
table_name column_name
ALL_PLUGINS PLUGIN_NAME
APPLICABLE_ROLES GRANTEE
CHARACTER_SETS CHARACTER_SET_NAME
CHECK_CONSTRAINTS CONSTRAINT_SCHEMA
CLIENT_STATISTICS CLIENT
COLLATIONS COLLATION_NAME
COLLATION_CHARACTER_SET_APPLICABILITY COLLATION_NAME
COLUMNS TABLE_SCHEMA
COLUMN_PRIVILEGES TABLE_SCHEMA
ENABLED_ROLES ROLE_NAME
ENGINES ENGINE
EVENTS EVENT_SCHEMA
FILES TABLE_SCHEMA
GEOMETRY_COLUMNS F_TABLE_SCHEMA
GLOBAL_STATUS VARIABLE_NAME
GLOBAL_VARIABLES VARIABLE_NAME
INDEX_STATISTICS TABLE_SCHEMA
INNODB_BUFFER_PAGE POOL_ID
INNODB_BUFFER_PAGE_LRU POOL_ID
INNODB_BUFFER_POOL_STATS POOL_ID
INNODB_CMP page_size
INNODB_CMPMEM page_size
INNODB_CMPMEM_RESET page_size
INNODB_CMP_PER_INDEX database_name
INNODB_CMP_RESET page_size
INNODB_LOCKS lock_id
INNODB_LOCK_WAITS requesting_trx_id
INNODB_METRICS NAME
INNODB_MUTEXES NAME
INNODB_SYS_COLUMNS TABLE_ID
INNODB_SYS_FIELDS INDEX_ID
INNODB_SYS_FOREIGN ID
INNODB_SYS_FOREIGN_COLS ID
INNODB_SYS_INDEXES INDEX_ID
INNODB_SYS_TABLES TABLE_ID
INNODB_SYS_TABLESTATS TABLE_ID
INNODB_SYS_VIRTUAL TABLE_ID
INNODB_TABLESPACES_ENCRYPTION SPACE
INNODB_TABLESPACES_SCRUBBING SPACE
INNODB_TRX trx_id
KEY_CACHES KEY_CACHE_NAME
KEY_COLUMN_USAGE CONSTRAINT_SCHEMA
OPTIMIZER_TRACE QUERY
PARAMETERS SPECIFIC_SCHEMA
PARTITIONS TABLE_SCHEMA
PLUGINS PLUGIN_NAME
PROCESSLIST ID
PROFILING QUERY_ID
REFERENTIAL_CONSTRAINTS CONSTRAINT_SCHEMA
ROUTINES ROUTINE_SCHEMA
SCHEMATA SCHEMA_NAME
SCHEMA_PRIVILEGES TABLE_SCHEMA
SESSION_STATUS VARIABLE_NAME
SESSION_VARIABLES VARIABLE_NAME
SPATIAL_REF_SYS SRID
STATISTICS TABLE_SCHEMA
SYSTEM_VARIABLES VARIABLE_NAME
TABLES TABLE_SCHEMA
TABLESPACES TABLESPACE_NAME
TABLE_CONSTRAINTS CONSTRAINT_SCHEMA
TABLE_PRIVILEGES TABLE_SCHEMA
TABLE_STATISTICS TABLE_SCHEMA
TRIGGERS TRIGGER_SCHEMA
USER_PRIVILEGES GRANTEE
USER_STATISTICS USER
VIEWS TABLE_SCHEMA
SELECT t.table_name, c1.column_name
FROM information_schema.tables t
INNER JOIN
information_schema.columns c1
ON t.table_schema = c1.table_schema AND
t.table_name = c1.table_name
WHERE t.table_schema = 'information_schema' AND
c1.ordinal_position =
( SELECT COALESCE(MIN(c2.ordinal_position),1)
FROM information_schema.columns c2
WHERE c2.table_schema = 'information_schema' AND
c2.table_name = t.table_name AND
c2.column_name LIKE '%SCHEMA%'
) order by t.table_name;
table_name column_name
ALL_PLUGINS PLUGIN_NAME
APPLICABLE_ROLES GRANTEE
CHARACTER_SETS CHARACTER_SET_NAME
CHECK_CONSTRAINTS CONSTRAINT_SCHEMA
CLIENT_STATISTICS CLIENT
COLLATIONS COLLATION_NAME
COLLATION_CHARACTER_SET_APPLICABILITY COLLATION_NAME
COLUMNS TABLE_SCHEMA
COLUMN_PRIVILEGES TABLE_SCHEMA
ENABLED_ROLES ROLE_NAME
ENGINES ENGINE
EVENTS EVENT_SCHEMA
FILES TABLE_SCHEMA
GEOMETRY_COLUMNS F_TABLE_SCHEMA
GLOBAL_STATUS VARIABLE_NAME
GLOBAL_VARIABLES VARIABLE_NAME
INDEX_STATISTICS TABLE_SCHEMA
INNODB_BUFFER_PAGE POOL_ID
INNODB_BUFFER_PAGE_LRU POOL_ID
INNODB_BUFFER_POOL_STATS POOL_ID
INNODB_CMP page_size
INNODB_CMPMEM page_size
INNODB_CMPMEM_RESET page_size
INNODB_CMP_PER_INDEX database_name
INNODB_CMP_RESET page_size
INNODB_LOCKS lock_id
INNODB_LOCK_WAITS requesting_trx_id
INNODB_METRICS NAME
INNODB_MUTEXES NAME
INNODB_SYS_COLUMNS TABLE_ID
INNODB_SYS_FIELDS INDEX_ID
INNODB_SYS_FOREIGN ID
INNODB_SYS_FOREIGN_COLS ID
INNODB_SYS_INDEXES INDEX_ID
INNODB_SYS_TABLES TABLE_ID
INNODB_SYS_TABLESTATS TABLE_ID
INNODB_SYS_VIRTUAL TABLE_ID
INNODB_TABLESPACES_ENCRYPTION SPACE
INNODB_TABLESPACES_SCRUBBING SPACE
INNODB_TRX trx_id
KEY_CACHES KEY_CACHE_NAME
KEY_COLUMN_USAGE CONSTRAINT_SCHEMA
OPTIMIZER_TRACE QUERY
PARAMETERS SPECIFIC_SCHEMA
PARTITIONS TABLE_SCHEMA
PLUGINS PLUGIN_NAME
PROCESSLIST ID
PROFILING QUERY_ID
REFERENTIAL_CONSTRAINTS CONSTRAINT_SCHEMA
ROUTINES ROUTINE_SCHEMA
SCHEMATA SCHEMA_NAME
SCHEMA_PRIVILEGES TABLE_SCHEMA
SESSION_STATUS VARIABLE_NAME
SESSION_VARIABLES VARIABLE_NAME
SPATIAL_REF_SYS SRID
STATISTICS TABLE_SCHEMA
SYSTEM_VARIABLES VARIABLE_NAME
TABLES TABLE_SCHEMA
TABLESPACES TABLESPACE_NAME
TABLE_CONSTRAINTS CONSTRAINT_SCHEMA
TABLE_PRIVILEGES TABLE_SCHEMA
TABLE_STATISTICS TABLE_SCHEMA
TRIGGERS TRIGGER_SCHEMA
USER_PRIVILEGES GRANTEE
USER_STATISTICS USER
VIEWS TABLE_SCHEMA
select 1 as "must be 1" from information_schema.tables where "ACCOUNTS"=
(select cast(table_name as char) from information_schema.tables
order by table_name limit 1) limit 1;
must be 1
1
select t.table_name, group_concat(t.table_schema, '.', t.table_name),
count(*) as num1
from information_schema.tables t
inner join information_schema.columns c1
on t.table_schema = c1.table_schema AND t.table_name = c1.table_name
where t.table_schema = 'information_schema' and
c1.ordinal_position =
(select isnull(c2.column_type) -
isnull(group_concat(c2.table_schema, '.', c2.table_name)) +
count(*) as num
from information_schema.columns c2 where
c2.table_schema='information_schema' and
(c2.column_type = 'varchar(7)' or c2.column_type = 'varchar(20)')
group by c2.column_type order by num limit 1)
group by t.table_name order by num1, t.table_name;
table_name group_concat(t.table_schema, '.', t.table_name) num1
ALL_PLUGINS information_schema.ALL_PLUGINS 1
APPLICABLE_ROLES information_schema.APPLICABLE_ROLES 1
CHARACTER_SETS information_schema.CHARACTER_SETS 1
CHECK_CONSTRAINTS information_schema.CHECK_CONSTRAINTS 1
CLIENT_STATISTICS information_schema.CLIENT_STATISTICS 1
COLLATIONS information_schema.COLLATIONS 1
COLLATION_CHARACTER_SET_APPLICABILITY information_schema.COLLATION_CHARACTER_SET_APPLICABILITY 1
COLUMNS information_schema.COLUMNS 1
COLUMN_PRIVILEGES information_schema.COLUMN_PRIVILEGES 1
ENGINES information_schema.ENGINES 1
EVENTS information_schema.EVENTS 1
FILES information_schema.FILES 1
GEOMETRY_COLUMNS information_schema.GEOMETRY_COLUMNS 1
GLOBAL_STATUS information_schema.GLOBAL_STATUS 1
GLOBAL_VARIABLES information_schema.GLOBAL_VARIABLES 1
INDEX_STATISTICS information_schema.INDEX_STATISTICS 1
INNODB_BUFFER_PAGE information_schema.INNODB_BUFFER_PAGE 1
INNODB_BUFFER_PAGE_LRU information_schema.INNODB_BUFFER_PAGE_LRU 1
INNODB_BUFFER_POOL_STATS information_schema.INNODB_BUFFER_POOL_STATS 1
INNODB_CMP information_schema.INNODB_CMP 1
INNODB_CMPMEM information_schema.INNODB_CMPMEM 1
INNODB_CMPMEM_RESET information_schema.INNODB_CMPMEM_RESET 1
INNODB_CMP_PER_INDEX information_schema.INNODB_CMP_PER_INDEX 1
INNODB_CMP_RESET information_schema.INNODB_CMP_RESET 1
INNODB_LOCKS information_schema.INNODB_LOCKS 1
INNODB_LOCK_WAITS information_schema.INNODB_LOCK_WAITS 1
INNODB_METRICS information_schema.INNODB_METRICS 1
INNODB_MUTEXES information_schema.INNODB_MUTEXES 1
INNODB_SYS_COLUMNS information_schema.INNODB_SYS_COLUMNS 1
INNODB_SYS_FIELDS information_schema.INNODB_SYS_FIELDS 1
INNODB_SYS_FOREIGN information_schema.INNODB_SYS_FOREIGN 1
INNODB_SYS_FOREIGN_COLS information_schema.INNODB_SYS_FOREIGN_COLS 1
INNODB_SYS_INDEXES information_schema.INNODB_SYS_INDEXES 1
INNODB_SYS_TABLES information_schema.INNODB_SYS_TABLES 1
INNODB_SYS_TABLESTATS information_schema.INNODB_SYS_TABLESTATS 1
INNODB_SYS_VIRTUAL information_schema.INNODB_SYS_VIRTUAL 1
INNODB_TABLESPACES_ENCRYPTION information_schema.INNODB_TABLESPACES_ENCRYPTION 1
INNODB_TABLESPACES_SCRUBBING information_schema.INNODB_TABLESPACES_SCRUBBING 1
INNODB_TRX information_schema.INNODB_TRX 1
KEY_CACHES information_schema.KEY_CACHES 1
KEY_COLUMN_USAGE information_schema.KEY_COLUMN_USAGE 1
OPTIMIZER_TRACE information_schema.OPTIMIZER_TRACE 1
PARAMETERS information_schema.PARAMETERS 1
PARTITIONS information_schema.PARTITIONS 1
PLUGINS information_schema.PLUGINS 1
PROCESSLIST information_schema.PROCESSLIST 1
PROFILING information_schema.PROFILING 1
REFERENTIAL_CONSTRAINTS information_schema.REFERENTIAL_CONSTRAINTS 1
ROUTINES information_schema.ROUTINES 1
SCHEMATA information_schema.SCHEMATA 1
SCHEMA_PRIVILEGES information_schema.SCHEMA_PRIVILEGES 1
SESSION_STATUS information_schema.SESSION_STATUS 1
SESSION_VARIABLES information_schema.SESSION_VARIABLES 1
SPATIAL_REF_SYS information_schema.SPATIAL_REF_SYS 1
STATISTICS information_schema.STATISTICS 1
SYSTEM_VARIABLES information_schema.SYSTEM_VARIABLES 1
TABLES information_schema.TABLES 1
TABLESPACES information_schema.TABLESPACES 1
TABLE_CONSTRAINTS information_schema.TABLE_CONSTRAINTS 1
TABLE_PRIVILEGES information_schema.TABLE_PRIVILEGES 1
TABLE_STATISTICS information_schema.TABLE_STATISTICS 1
TRIGGERS information_schema.TRIGGERS 1
USER_PRIVILEGES information_schema.USER_PRIVILEGES 1
USER_STATISTICS information_schema.USER_STATISTICS 1
VIEWS information_schema.VIEWS 1
+---------------------------------------+
+---------------------------------------+
+---------------------------------------+
Database: information_schema
| Tables |
| ALL_PLUGINS |
| APPLICABLE_ROLES |
| CHARACTER_SETS |
| CHECK_CONSTRAINTS |
| CLIENT_STATISTICS |
| COLLATIONS |
| COLLATION_CHARACTER_SET_APPLICABILITY |
| COLUMNS |
| COLUMN_PRIVILEGES |
| ENABLED_ROLES |
| ENGINES |
| EVENTS |
| FILES |
| GEOMETRY_COLUMNS |
| GLOBAL_STATUS |
| GLOBAL_VARIABLES |
| INDEX_STATISTICS |
| INNODB_BUFFER_PAGE |
| INNODB_BUFFER_PAGE_LRU |
| INNODB_BUFFER_POOL_STATS |
| INNODB_CMP |
| INNODB_CMPMEM |
| INNODB_CMPMEM_RESET |
| INNODB_CMP_PER_INDEX |
| INNODB_CMP_RESET |
| INNODB_LOCKS |
| INNODB_LOCK_WAITS |
| INNODB_METRICS |
| INNODB_MUTEXES |
| INNODB_SYS_COLUMNS |
| INNODB_SYS_FIELDS |
| INNODB_SYS_FOREIGN |
| INNODB_SYS_FOREIGN_COLS |
| INNODB_SYS_INDEXES |
| INNODB_SYS_TABLES |
| INNODB_SYS_TABLESTATS |
| INNODB_SYS_VIRTUAL |
| INNODB_TABLESPACES_ENCRYPTION |
| INNODB_TABLESPACES_SCRUBBING |
| INNODB_TRX |
| KEY_CACHES |
| KEY_COLUMN_USAGE |
| OPTIMIZER_TRACE |
| PARAMETERS |
| PARTITIONS |
| PLUGINS |
| PROCESSLIST |
| PROFILING |
| REFERENTIAL_CONSTRAINTS |
| ROUTINES |
| SCHEMATA |
| SCHEMA_PRIVILEGES |
| SESSION_STATUS |
| SESSION_VARIABLES |
| SPATIAL_REF_SYS |
| STATISTICS |
| SYSTEM_VARIABLES |
| TABLES |
| TABLESPACES |
| TABLE_CONSTRAINTS |
| TABLE_PRIVILEGES |
| TABLE_STATISTICS |
| TRIGGERS |
| USER_PRIVILEGES |
| USER_STATISTICS |
| VIEWS |
+---------------------------------------+
+---------------------------------------+
+---------------------------------------+
Database: INFORMATION_SCHEMA
| Tables |
| ALL_PLUGINS |
| APPLICABLE_ROLES |
| CHARACTER_SETS |
| CHECK_CONSTRAINTS |
| CLIENT_STATISTICS |
| COLLATIONS |
| COLLATION_CHARACTER_SET_APPLICABILITY |
| COLUMNS |
| COLUMN_PRIVILEGES |
| ENABLED_ROLES |
| ENGINES |
| EVENTS |
| FILES |
| GEOMETRY_COLUMNS |
| GLOBAL_STATUS |
| GLOBAL_VARIABLES |
| INDEX_STATISTICS |
| INNODB_BUFFER_PAGE |
| INNODB_BUFFER_PAGE_LRU |
| INNODB_BUFFER_POOL_STATS |
| INNODB_CMP |
| INNODB_CMPMEM |
| INNODB_CMPMEM_RESET |
| INNODB_CMP_PER_INDEX |
| INNODB_CMP_RESET |
| INNODB_LOCKS |
| INNODB_LOCK_WAITS |
| INNODB_METRICS |
| INNODB_MUTEXES |
| INNODB_SYS_COLUMNS |
| INNODB_SYS_FIELDS |
| INNODB_SYS_FOREIGN |
| INNODB_SYS_FOREIGN_COLS |
| INNODB_SYS_INDEXES |
| INNODB_SYS_TABLES |
| INNODB_SYS_TABLESTATS |
| INNODB_SYS_VIRTUAL |
| INNODB_TABLESPACES_ENCRYPTION |
| INNODB_TABLESPACES_SCRUBBING |
| INNODB_TRX |
| KEY_CACHES |
| KEY_COLUMN_USAGE |
| OPTIMIZER_TRACE |
| PARAMETERS |
| PARTITIONS |
| PLUGINS |
| PROCESSLIST |
| PROFILING |
| REFERENTIAL_CONSTRAINTS |
| ROUTINES |
| SCHEMATA |
| SCHEMA_PRIVILEGES |
| SESSION_STATUS |
| SESSION_VARIABLES |
| SPATIAL_REF_SYS |
| STATISTICS |
| SYSTEM_VARIABLES |
| TABLES |
| TABLESPACES |
| TABLE_CONSTRAINTS |
| TABLE_PRIVILEGES |
| TABLE_STATISTICS |
| TRIGGERS |
| USER_PRIVILEGES |
| USER_STATISTICS |
| VIEWS |
+--------------------+
+--------------------+
+--------------------+
Wildcard: inf_rmation_schema
| Databases |
| information_schema |
SELECT table_schema, count(*) FROM information_schema.TABLES WHERE table_schema IN ('mysql', 'INFORMATION_SCHEMA', 'test', 'mysqltest') GROUP BY TABLE_SCHEMA;
table_schema count(*)
information_schema 66
mysql 31
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