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Bug#39955 SELECT on INFORMATION_SCHEMA.GLOBAL_VARIABLES takes too long

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VARIABLE_VALUE field is decreased to 1024 symbols.
(affected I_S tables: GLOBAL_VARIABLES, SESSION_VARIABLES,
 GLOBAL_STATUS, SESSION_STATUS).
The only variable which can be longer than 1024 is
init_connect. The variable will be truncated with warning.
Additional fix:
Added where condition filter which speed up queries which
have where condition with expressions which use VARIABLE_NAME
field.
This commit is contained in:
Sergey Glukhov
2008-11-13 16:09:11 +04:00
parent 45deeca2dd
commit 3fa2673f19
5 changed files with 116 additions and 29 deletions
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16
mysql-test/suite/funcs_1/r/is_columns_is.result
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@@ -110,9 +110,9 @@ NULL information_schema FILES UPDATE_COUNT 13 NULL YES bigint NULL NULL 19 0 NUL
NULL information_schema FILES UPDATE_TIME 34 NULL YES datetime NULL NULL NULL NULL NULL NULL datetime select
NULL information_schema FILES VERSION 25 NULL YES bigint NULL NULL 19 0 NULL NULL bigint(21) unsigned select
NULL information_schema GLOBAL_STATUS VARIABLE_NAME 1 NO varchar 64 192 NULL NULL utf8 utf8_general_ci varchar(64) select
NULL information_schema GLOBAL_STATUS VARIABLE_VALUE 2 NULL YES varchar 20480 61440 NULL NULL utf8 utf8_general_ci varchar(20480) select
NULL information_schema GLOBAL_STATUS VARIABLE_VALUE 2 NULL YES varchar 1024 3072 NULL NULL utf8 utf8_general_ci varchar(1024) select
NULL information_schema GLOBAL_VARIABLES VARIABLE_NAME 1 NO varchar 64 192 NULL NULL utf8 utf8_general_ci varchar(64) select
NULL information_schema GLOBAL_VARIABLES VARIABLE_VALUE 2 NULL YES varchar 20480 61440 NULL NULL utf8 utf8_general_ci varchar(20480) select
NULL information_schema GLOBAL_VARIABLES VARIABLE_VALUE 2 NULL YES varchar 1024 3072 NULL NULL utf8 utf8_general_ci varchar(1024) select
NULL information_schema KEY_COLUMN_USAGE COLUMN_NAME 7 NO varchar 64 192 NULL NULL utf8 utf8_general_ci varchar(64) select
NULL information_schema KEY_COLUMN_USAGE CONSTRAINT_CATALOG 1 NULL YES varchar 512 1536 NULL NULL utf8 utf8_general_ci varchar(512) select
NULL information_schema KEY_COLUMN_USAGE CONSTRAINT_NAME 3 NO varchar 64 192 NULL NULL utf8 utf8_general_ci varchar(64) select
@@ -213,9 +213,9 @@ NULL information_schema SCHEMA_PRIVILEGES PRIVILEGE_TYPE 4 NO varchar 64 192 NU
NULL information_schema SCHEMA_PRIVILEGES TABLE_CATALOG 2 NULL YES varchar 512 1536 NULL NULL utf8 utf8_general_ci varchar(512) select
NULL information_schema SCHEMA_PRIVILEGES TABLE_SCHEMA 3 NO varchar 64 192 NULL NULL utf8 utf8_general_ci varchar(64) select
NULL information_schema SESSION_STATUS VARIABLE_NAME 1 NO varchar 64 192 NULL NULL utf8 utf8_general_ci varchar(64) select
NULL information_schema SESSION_STATUS VARIABLE_VALUE 2 NULL YES varchar 20480 61440 NULL NULL utf8 utf8_general_ci varchar(20480) select
NULL information_schema SESSION_STATUS VARIABLE_VALUE 2 NULL YES varchar 1024 3072 NULL NULL utf8 utf8_general_ci varchar(1024) select
NULL information_schema SESSION_VARIABLES VARIABLE_NAME 1 NO varchar 64 192 NULL NULL utf8 utf8_general_ci varchar(64) select
NULL information_schema SESSION_VARIABLES VARIABLE_VALUE 2 NULL YES varchar 20480 61440 NULL NULL utf8 utf8_general_ci varchar(20480) select
NULL information_schema SESSION_VARIABLES VARIABLE_VALUE 2 NULL YES varchar 1024 3072 NULL NULL utf8 utf8_general_ci varchar(1024) select
NULL information_schema STATISTICS CARDINALITY 10 NULL YES bigint NULL NULL 19 0 NULL NULL bigint(21) select
NULL information_schema STATISTICS COLLATION 9 NULL YES varchar 1 3 NULL NULL utf8 utf8_general_ci varchar(1) select
NULL information_schema STATISTICS COLUMN_NAME 8 NO varchar 64 192 NULL NULL utf8 utf8_general_ci varchar(64) select
@@ -464,9 +464,9 @@ NULL information_schema FILES CHECKSUM bigint NULL NULL NULL NULL bigint(21) uns
3.0000 information_schema FILES STATUS varchar 20 60 utf8 utf8_general_ci varchar(20)
3.0000 information_schema FILES EXTRA varchar 255 765 utf8 utf8_general_ci varchar(255)
3.0000 information_schema GLOBAL_STATUS VARIABLE_NAME varchar 64 192 utf8 utf8_general_ci varchar(64)
3.0000 information_schema GLOBAL_STATUS VARIABLE_VALUE varchar 20480 61440 utf8 utf8_general_ci varchar(20480)
3.0000 information_schema GLOBAL_STATUS VARIABLE_VALUE varchar 1024 3072 utf8 utf8_general_ci varchar(1024)
3.0000 information_schema GLOBAL_VARIABLES VARIABLE_NAME varchar 64 192 utf8 utf8_general_ci varchar(64)
3.0000 information_schema GLOBAL_VARIABLES VARIABLE_VALUE varchar 20480 61440 utf8 utf8_general_ci varchar(20480)
3.0000 information_schema GLOBAL_VARIABLES VARIABLE_VALUE varchar 1024 3072 utf8 utf8_general_ci varchar(1024)
3.0000 information_schema KEY_COLUMN_USAGE CONSTRAINT_CATALOG varchar 512 1536 utf8 utf8_general_ci varchar(512)
3.0000 information_schema KEY_COLUMN_USAGE CONSTRAINT_SCHEMA varchar 64 192 utf8 utf8_general_ci varchar(64)
3.0000 information_schema KEY_COLUMN_USAGE CONSTRAINT_NAME varchar 64 192 utf8 utf8_general_ci varchar(64)
@@ -567,9 +567,9 @@ NULL information_schema ROUTINES LAST_ALTERED datetime NULL NULL NULL NULL datet
3.0000 information_schema SCHEMA_PRIVILEGES PRIVILEGE_TYPE varchar 64 192 utf8 utf8_general_ci varchar(64)
3.0000 information_schema SCHEMA_PRIVILEGES IS_GRANTABLE varchar 3 9 utf8 utf8_general_ci varchar(3)
3.0000 information_schema SESSION_STATUS VARIABLE_NAME varchar 64 192 utf8 utf8_general_ci varchar(64)
3.0000 information_schema SESSION_STATUS VARIABLE_VALUE varchar 20480 61440 utf8 utf8_general_ci varchar(20480)
3.0000 information_schema SESSION_STATUS VARIABLE_VALUE varchar 1024 3072 utf8 utf8_general_ci varchar(1024)
3.0000 information_schema SESSION_VARIABLES VARIABLE_NAME varchar 64 192 utf8 utf8_general_ci varchar(64)
3.0000 information_schema SESSION_VARIABLES VARIABLE_VALUE varchar 20480 61440 utf8 utf8_general_ci varchar(20480)
3.0000 information_schema SESSION_VARIABLES VARIABLE_VALUE varchar 1024 3072 utf8 utf8_general_ci varchar(1024)
3.0000 information_schema STATISTICS TABLE_CATALOG varchar 512 1536 utf8 utf8_general_ci varchar(512)
3.0000 information_schema STATISTICS TABLE_SCHEMA varchar 64 192 utf8 utf8_general_ci varchar(64)
3.0000 information_schema STATISTICS TABLE_NAME varchar 64 192 utf8 utf8_general_ci varchar(64)