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e42c980967
The table opening process now works the following way: - Create common TABLE_SHARE object - Read the .frm file and unpack it into the TABLE_SHARE object - Create a TABLE object based on the information in the TABLE_SHARE object and open a handler to the table object Other noteworthy changes: - In TABLE_SHARE the most common strings are now LEX_STRING's - Better error message when table is not found - Variable table_cache is now renamed 'table_open_cache' - New variable 'table_definition_cache' that is the number of table defintions that will be cached - strxnmov() calls are now fixed to avoid overflows - strxnmov() will now always add one end \0 to result - engine objects are now created with a TABLE_SHARE object instead of a TABLE object. - After creating a field object one must call field->init(table) before using it - For a busy system this change will give you: - Less memory usage for table object - Faster opening of tables (if it's has been in use or is in table definition cache) - Allow you to cache many table definitions objects - Faster drop of table
137 lines
2.3 KiB
Text
137 lines
2.3 KiB
Text
drop table if exists t1,t2;
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create table t1 (a int not null auto_increment primary key);
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insert into t1 values(0);
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lock table t1 read;
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flush table t1;
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check table t1;
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Table Op Msg_type Msg_text
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test.t1 check status OK
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unlock tables;
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lock table t1 read;
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lock table t1 read;
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flush table t1;
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select * from t1;
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a
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1
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unlock tables;
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select * from t1;
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a
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1
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unlock tables;
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lock table t1 write;
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lock table t1 read;
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flush table t1;
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select * from t1;
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a
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1
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unlock tables;
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unlock tables;
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lock table t1 read;
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lock table t1 write;
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flush table t1;
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select * from t1;
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a
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1
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unlock tables;
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unlock tables;
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select * from t1;
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a
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1
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drop table t1;
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create table t1(table_id char(20) primary key);
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create table t2(table_id char(20) primary key);
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insert into t1 values ('test.t1');
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insert into t1 values ('');
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insert into t2 values ('test.t2');
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insert into t2 values ('');
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handler t1 open as a1;
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handler t1 open as a2;
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handler t2 open;
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handler a1 read first limit 9;
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table_id
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test.t1
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handler a2 read first limit 9;
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table_id
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test.t1
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handler t2 read first limit 9;
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table_id
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test.t2
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flush tables;
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handler a1 read first limit 9;
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table_id
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test.t1
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handler a2 read first limit 9;
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table_id
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test.t1
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handler t2 read first limit 9;
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table_id
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test.t2
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handler t1 open as a1;
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ERROR 42000: Not unique table/alias: 'a1'
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handler t1 open as a2;
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ERROR 42000: Not unique table/alias: 'a2'
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handler t2 open;
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ERROR 42000: Not unique table/alias: 't2'
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handler a1 read first limit 9;
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table_id
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test.t1
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handler a2 read first limit 9;
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table_id
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test.t1
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handler t2 read first limit 9;
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table_id
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test.t2
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flush table t1;
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handler a1 read first limit 9;
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table_id
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test.t1
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handler a2 read first limit 9;
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table_id
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test.t1
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handler t2 read first limit 9;
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table_id
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test.t2
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flush table t2;
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handler t2 close;
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drop table t1;
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drop table t2;
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create table t1(table_id char(20) primary key);
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insert into t1 values ('Record-01');
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insert into t1 values ('Record-02');
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insert into t1 values ('Record-03');
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insert into t1 values ('Record-04');
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insert into t1 values ('Record-05');
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handler t1 open;
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handler t1 read first limit 1;
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table_id
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Record-01
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handler t1 read next limit 1;
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table_id
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Record-02
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handler t1 read next limit 1;
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table_id
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Record-03
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flush table t1;
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handler t1 read next limit 1;
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table_id
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Record-01
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handler t1 read next limit 1;
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table_id
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Record-02
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handler t1 close;
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drop table t1;
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FLUSH TABLES WITH READ LOCK ;
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FLUSH TABLES WITH READ LOCK ;
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UNLOCK TABLES;
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