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Decimals with float, double and decimal now works the following way: - DECIMAL_NOT_SPECIFIED is used when declaring DECIMALS without a firm number of decimals. It's only used in asserts and my_decimal_int_part. - FLOATING_POINT_DECIMALS (31) is used to mark that a FLOAT or DOUBLE was defined without decimals. This is regarded as a floating point value. - Max decimals allowed for FLOAT and DOUBLE is FLOATING_POINT_DECIMALS-1 - Clients assumes that float and double with decimals >= NOT_FIXED_DEC are floating point values (no decimals) - In the .frm decimals=FLOATING_POINT_DECIMALS are used to define floating point for float and double (31, like before) To ensure compatibility with old clients we do: - When storing float and double, we change NOT_FIXED_DEC to FLOATING_POINT_DECIMALS. - When creating fields from .frm we change for float and double FLOATING_POINT_DEC to NOT_FIXED_DEC - When sending definition for a float/decimal field without decimals to the client as part of a result set we convert NOT_FIXED_DEC to FLOATING_POINT_DECIMALS. - variance() and std() has changed to limit the decimals to FLOATING_POINT_DECIMALS -1 to not get the double converted floating point. (This was to preserve compatiblity) - FLOAT and DOUBLE still have 30 as max number of decimals. Bugs fixed: variance() printed more decimals than we support for double values. New behaviour: - Strings now have 38 decimals instead of 30 when converted to decimal - CREATE ... SELECT with a decimal with > 30 decimals will create a column with a smaller range than before as we are trying to preserve the number of decimals. Other changes - We are now using the obsolete bit FIELDFLAG_LEFT_FULLSCREEN to specify decimals > 31 - NOT_FIXED_DEC is now declared in one place - For clients, NOT_FIXED_DEC is always 31 (to ensure compatibility). On the server NOT_FIXED_DEC is DECIMAL_NOT_SPECIFIED (39) - AUTO_SEC_PART_DIGITS is taken from DECIMAL_NOT_SPECIFIED - DOUBLE conversion functions are now using DECIMAL_NOT_SPECIFIED instead of NOT_FIXED_DEC
56 lines
1.6 KiB
Text
56 lines
1.6 KiB
Text
#
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# Bug#12427262 : 60961: SHOW TABLES VERY SLOW WHEN NOT IN SYSTEM DISK CACHE.
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#
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create database show_table_lw_db;
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use show_table_lw_db;
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create table t1 (c1 int);
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create table t2 (c1 int);
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create table t3 (c1 int);
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create table t4 (c1 int);
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create table t5 (c1 int);
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create table t6 (c1 int);
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create table t7 (c1 int);
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create table t8 (c1 int);
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create table t9 (c1 int);
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create table t10 (c1 int);
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select Sum(ALL(COUNT_READ)) from performance_schema.file_summary_by_instance where FILE_NAME
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like "%show_table_lw_db%" AND FILE_NAME like "%.frm%" AND EVENT_NAME='wait/io/file/sql/FRM'
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into @count_read_before;
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show tables;
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Tables_in_show_table_lw_db
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t1
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t10
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t2
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t3
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t4
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t5
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t6
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t7
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t8
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t9
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select Sum(ALL(COUNT_READ)) from performance_schema.file_summary_by_instance where FILE_NAME
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like "%show_table_lw_db%" AND FILE_NAME like "%.frm%" AND EVENT_NAME='wait/io/file/sql/FRM'
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into @count_read_after;
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select @count_read_after-@count_read_before;
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@count_read_after-@count_read_before
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0.00000000000000000000000000000000000000
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show full tables;
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Tables_in_show_table_lw_db Table_type
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t1 BASE TABLE
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t10 BASE TABLE
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t2 BASE TABLE
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t3 BASE TABLE
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t4 BASE TABLE
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t5 BASE TABLE
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t6 BASE TABLE
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t7 BASE TABLE
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t8 BASE TABLE
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t9 BASE TABLE
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select Sum(ALL(COUNT_READ)) from performance_schema.file_summary_by_instance where FILE_NAME
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like "%show_table_lw_db%" AND FILE_NAME like "%.frm%" AND EVENT_NAME='wait/io/file/sql/FRM'
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into @count_read_after;
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select @count_read_after-@count_read_before;
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@count_read_after-@count_read_before
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10.00000000000000000000000000000000000000
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drop table t1;
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drop database show_table_lw_db;
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