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Commit 27561841 authored by sasha@mysql.sashanet.com's avatar sasha@mysql.sashanet.com
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merged latest changes in 3.23

parents 6bedc859 cc35643e
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Showing with 221 additions and 130 deletions
Docs/manual.texi
View file @ 27561841
......@@ -633,6 +633,7 @@ Examples of Common Queries
* example-user-variables:: Using user variables
* example-Foreign keys:: Using foreign keys
* Searching on two keys::
* Calculating days::
Queries from Twin Project
......@@ -16551,6 +16552,7 @@ mysql> select 2 > 2;
-> 0
@end example
@cindex @code{NULL}, testing for null
@findex <=> (Equal to)
@item <=>
Null safe equal:
......@@ -16559,6 +16561,7 @@ mysql> select 1 <=> 1, NULL <=> NULL, 1 <=> NULL;
-> 1 1 0
@end example
@cindex @code{NULL}, testing for null
@findex IS NULL
@findex IS NOT NULL
@item IS NULL
......@@ -16643,6 +16646,7 @@ mysql> select ISNULL(1/0);
Note that a comparison of @code{NULL} values using @code{=} will always be
false!
@cindex @code{NULL}, testing for null
@findex COALESCE()
@item COALESCE(list)
Returns first non-@code{NULL} element in list:
......@@ -16860,6 +16864,7 @@ make string comparison even more flexible.
@subsection Control Flow Functions
@table @code
@cindex @code{NULL}, testing for null
@findex IFNULL()
@item IFNULL(expr1,expr2)
If @code{expr1} is not @code{NULL}, @code{IFNULL()} returns @code{expr1},
......@@ -17136,10 +17141,13 @@ mysql> select SQRT(20);
@findex PI()
@item PI()
Returns the value of PI:
Returns the value of PI. The default shown number of decimals is 5, but
@strong{MySQL} internally uses the full double precession for PI.
@example
mysql> select PI();
-> 3.141593
mysql> SELECT PI()+0.000000000000000000;
-> 3.141592653589793116
@end example
@findex COS()
......@@ -19268,7 +19276,7 @@ The options work for all table types, if not otherwise indicated:
@item @code{PACK_KEYS} @tab Set this to 1 if you want to have a smaller index. This usually makes updates slower and reads faster (MyISAM, ISAM).
@item @code{PASSWORD} @tab Encrypt the @code{.frm} file with a password. This option doesn't do anything in the standard @strong{MySQL} version.
@item @code{DELAY_KEY_WRITE} @tab Set this to 1 if want to delay key table updates until the table is closed (MyISAM).
@item @code{ROW_FORMAT} @tab Defines how the rows should be stored (for the future).
@item @code{ROW_FORMAT} @tab Defines how the rows should be stored. Currently you can only use the DYNAMIC and STATIC options for MyISAM tables.
@end multitable
When you use a @code{MyISAM} table, @strong{MySQL} uses the product of
......@@ -19461,9 +19469,8 @@ normally do @code{ALTER TABLE} that often this isn't that high on our TODO.
@itemize @bullet
@item
To use @code{ALTER TABLE}, you need @strong{select}, @strong{insert},
@strong{delete}, @strong{update}, @strong{create}, and @strong{drop}
privileges on the table.
To use @code{ALTER TABLE}, you need @strong{ALTER}, @strong{INSERT},
and @strong{CREATE} privileges on the table.
@item
@code{IGNORE} is a @strong{MySQL} extension to ANSI SQL92.
......@@ -19553,7 +19560,7 @@ assigns a default value, as described in
@findex DROP INDEX
@item
@code{DROP INDEX} removes an index. This is a @strong{MySQL} extension to
ANSI SQL92.
ANSI SQL92. @xref{DROP INDEX}.
@item
If columns are dropped from a table, the columns are also removed from any
......@@ -20527,6 +20534,8 @@ or INSERT [LOW_PRIORITY | DELAYED] [IGNORE]
or INSERT [LOW_PRIORITY | DELAYED] [IGNORE]
[INTO] tbl_name
SET col_name=expression, col_name=expression, ...
or INSERT [LOW_PRIORITY] [IGNORE] [INTO] tbl_name
SELECT ...
@end example
......@@ -22289,8 +22298,8 @@ tables to use the slower key cache method to create the index.
@strong{NOTE} that this parameter is given in megabytes!
@item @code{myisam_max_sort_file_size}
The maximum size of the temporary file @strong{MySQL} is allowed to create
to while recreating the index (during @code{REPAIR}, @code{ALTER TABLE}
The maximum size of the temporary file @strong{MySQL} is allowed to use
while recreating the index (during @code{REPAIR}, @code{ALTER TABLE}
or @code{LOAD DATA INFILE}. If the file size would be bigger than this,
the index will be created through the key cache (which is slower).
@strong{NOTE} that this parameter is given in megabytes!
......@@ -22605,8 +22614,23 @@ combination after it has found the first matching row.
@item Not exists
@strong{MySQL} was able to do a @code{LEFT JOIN} optimization on the
query and will not examine more rows in this table for a row combination
after it finds one row that matches the @code{LEFT JOIN} criteria.
query and will not examine more rows in this table for the previous row
combination after it finds one row that matches the @code{LEFT JOIN} criteria.
Here is an example for this:
@example
SELECT * FROM t1 LEFT JOIN t2 ON t1.id=t2.id WHERE t2.id IS NULL;
@end example
Assume that @code{t2.id} is defined with @code{NOT NULL}. In this case
@strong{MySQL} will scan @code{t1} and look up the rows in @code{t2}
through @code{t1.id}. If @strong{MySQL} finds a matching row in
@code{t2}, it knows that @code{t2.id} can never be @code{NULL}, and will
not scan through the rest of the rows in @code{t2} that has the same
@code{id}. In other words, for each row in @code{t1}, @strong{MySQL}
only needs to do a single lookup in @code{t2}, independent of how many
matching rows there are in @code{t2}.
@item @code{range checked for each record (index map: #)}
@strong{MySQL} didn't find a real good index to use. It will, instead, for
......@@ -22863,6 +22887,9 @@ the @code{FROM} clause.
@{DESCRIBE | DESC@} tbl_name @{col_name | wild@}
@end example
@code{DESCRIBE} is a shortcut for @code{SHOW COLUMNS FROM}.
@xref{SHOW DATABASE INFO}.
@code{DESCRIBE} provides information about a table's columns. @code{col_name}
may be a column name or a string containing the SQL @samp{%} and @samp{_}
wild-card characters.
......@@ -22954,6 +22981,18 @@ are locked by the current thread are automatically unlocked when the
thread issues another @code{LOCK TABLES}, or when the connection to the
server is closed.
The main reasons to use @code{LOCK TABLES} are:
@itemize @bullet
@item
Emulate transactions with not transaction safe tables.
@item
To get more speed with @code{MyISAM} tables when inserting/updating data
over many statements. The main reason this gives more speed is that
@strong{MySQL} will not flush the key cache for the locked tables until
@code{UNLOCK TABLES} is called.
@end itemize
If a thread obtains a @code{READ} lock on a table, that thread (and all other
threads) can only read from the table. If a thread obtains a @code{WRITE}
lock on a table, then only the thread holding the lock can @code{READ} from
......@@ -24519,7 +24558,7 @@ mysql> ALTER TABLE tbl_name TYPE = MYISAM;
@end example
@cindex tables, @code{HEAP}
@node HEAP, BDB, ISAM, Table types
@node HEAP, InnoDB, ISAM, Table types
@section HEAP Tables
@code{HEAP} tables use a hashed index and are stored in memory. This
......@@ -24596,7 +24635,7 @@ SUM_OVER_ALL_KEYS(max_length_of_key + sizeof(char*) * 2)
@code{sizeof(char*)} is 4 on 32-bit machines and 8 on 64-bit machines.
@node InnoDB, , GEMINI, Table types
@node InnoDB, BDB, HEAP, Table types
@section InnoDB Tables
@menu
......@@ -25897,7 +25936,7 @@ Finland
@cindex tables, @code{BDB}
@cindex tables, @code{Berkeley DB}
@node BDB, GEMINI, HEAP, Table types
@node BDB, GEMINI, InnoDB, Table types
@section BDB or Berkeley_DB Tables
@menu
......@@ -26183,7 +26222,7 @@ not trivial).
@end itemize
@cindex GEMINI tables
@node GEMINI, InnoDB, BDB, Table types
@node GEMINI, , BDB, Table types
@section GEMINI Tables
@cindex GEMINI tables, overview
......@@ -28800,6 +28839,7 @@ mysql> SELECT * FROM shop;
* example-user-variables:: Using user variables
* example-Foreign keys:: Using foreign keys
* Searching on two keys::
* Calculating days::
@end menu
@node example-Maximum-column, example-Maximum-row, Examples, Examples
......@@ -29056,7 +29096,7 @@ SELECT s.* FROM persons p, shirts s
@findex UNION
@cindex searching, two keys
@cindex keys, searching on two
@node Searching on two keys, , example-Foreign keys, Examples
@node Searching on two keys, Calculating days, example-Foreign keys, Examples
@subsection Searching on Two Keys
@strong{MySQL} doesn't yet optimize when you search on two different
......@@ -29088,6 +29128,35 @@ DROP TABLE tmp;
The above way to solve this query is in effect an @code{UNION} of two queries.
@cindex bit_functions, example
@findex BIT_OR
@findex BIT_COUNT
@findex <<
@node Calculating days, , Searching on two keys, Examples
@subsection Calculating visits per day
The following shows an idea of how you can use the bit group functions
to calculate the number of days per month a user has visited a web page.
@example
CREATE TABLE t1 (year YEAR(4), month INT(2) UNSIGNED ZEROFILL, day INT(2) UNSIGNED ZEROFILL);
INSERT INTO t1 VALUES(2000,1,1),(2000,1,20),(2000,1,30),(2000,2,2),(2000,2,23),(2000,2,23);
SELECT year,month,BIT_COUNT(BIT_OR(1<<day)) AS days FROM t1 GROUP BY year,month;
Which returns:
+------+-------+------+
| year | month | days |
+------+-------+------+
| 2000 | 01 | 3 |
| 2000 | 02 | 2 |
+------+-------+------+
@end example
The above calculates how many different days was used for a given
year/month combination, with automatic removal of duplicate entries.
@cindex modes, batch
@cindex batch mode
@cindex running, batch mode
......@@ -30911,10 +30980,13 @@ unless you know what you are doing!
@itemize
@item
Minimal length of word to be indexed is defined by @strong{MySQL}
variable @code{ft_min_word_length}. @xref{SHOW VARIABLES}.
Change it to the value you prefer, and rebuild
your @code{FULLTEXT} indexes (e.g. with @code{OPTIMIZE TABLE}).
Minimal length of word to be indexed is defined in
@code{myisam/ftdefs.h} file by the line
@example
#define MIN_WORD_LEN 4
@end example
Change it to the value you prefer, recompile @strong{MySQL}, and rebuild
your @code{FULLTEXT} indexes.
@item
The stopword list is defined in @code{myisam/ft_static.c}
......@@ -30980,6 +31052,9 @@ index operations (querying/dumping/statistics).
@itemize @bullet
@item Make all operations with @code{FULLTEXT} index @strong{faster}.
@item Support for braces @code{()} in boolean full-text search.
@item Phrase search, proximity operators
@item Boolean search can work without @code{FULLTEXT} index
(yes, @strong{very} slow).
@item Support for "always-index words". They could be any strings
the user wants to treat as words, examples are "C++", "AS/400", "TCP/IP", etc.
@item Support for full-text search in @code{MERGE} tables.
......@@ -52004,7 +52079,19 @@ structure.
Don't allow more than a defined number of threads to run MyISAM recover
at the same time.
@item
Change @code{INSERT ... SELECT} to use concurrent inserts.
Change @code{INSERT ... SELECT} to optionally use concurrent inserts.
@item
Implement @code{RENAME DATABASE}. To make this safe for all table handlers,
it should work as follows:
@itemize @bullet
@item
Create the new database.
@item
For every table do a rename of the table to another database, as
we do with the @code{RENAME} command.
@item
Drop the old database.
@end itemize
@item
Return the original field types() when doing @code{SELECT MIN(column)
... GROUP BY}.
......@@ -52051,6 +52138,8 @@ a concurrent insert at the end of the file if the file is read-locked.
@item
Remember @code{FOREIGN} key definitions in the @file{.frm} file.
@item
Cascading @code{DELETE}
@item
Server side cursors.
@item
Check if @code{lockd} works with modern Linux kernels; If not, we have
......@@ -52060,6 +52149,13 @@ give any errors if @code{lockd} works.
@item
Allow SQL variables in @code{LIMIT}, like in @code{LIMIT @@a,@@b}.
@item
Allow update of variables in @code{UPDATE} statements. For example:
@code{UPDATE TABLE foo SET @@a=a+b,a=@@a, b=@@a+c}
@item
Change when user variables are updated so that one can use them with
@code{GROUP BY}, as in the following example:
@code{SELECT id, @@a:=count(*), sum(sum_col)/@@a FROM table_name GROUP BY id}.
@item
Don't add automatic @code{DEFAULT} values to columns. Give an error when using
an @code{INSERT} that doesn't contain a column that doesn't have a
@code{DEFAULT}.
......@@ -52198,9 +52294,6 @@ Change that @code{ALTER TABLE} doesn't abort clients that executes
Fix that when columns referenced in an @code{UPDATE} clause contains the old
values before the update started.
@item
Allow update of variables in @code{UPDATE} statements. For example:
@code{UPDATE TABLE foo SET @@a=a+b,a=@@a, b=@@a+c}
@item
@code{myisamchk}, @code{REPAIR} and @code{OPTIMIZE TABLE} should be able
to handle cases where the data and/or index files are symbolic links.
@item
sql/slave.cc
View file @ 27561841
......@@ -27,7 +27,7 @@
#define RPL_LOG_NAME (glob_mi.log_file_name[0] ? glob_mi.log_file_name :\
"FIRST")
bool slave_running = 0;
volatile bool slave_running = 0;
pthread_t slave_real_id;
MASTER_INFO glob_mi;
HASH replicate_do_table, replicate_ignore_table;
......
sql/slave.h
View file @ 27561841
......@@ -98,8 +98,7 @@ int init_master_info(MASTER_INFO* mi);
void end_master_info(MASTER_INFO* mi);
extern bool opt_log_slave_updates ;
pthread_handler_decl(handle_slave,arg);
extern bool volatile abort_loop, abort_slave;
extern bool slave_running;
extern bool volatile abort_loop, abort_slave, slave_running;
extern uint32 slave_skip_counter;
// needed for problems when slave stops and
// we want to restart it skipping one or more events in the master log that
......
sql/sql_base.cc
View file @ 27561841
......@@ -34,6 +34,8 @@ HASH open_cache; /* Used by mysql_test */
static int open_unireg_entry(THD *thd,TABLE *entry,const char *db,
const char *name, const char *alias, bool locked);
static bool insert_fields(THD *thd,TABLE_LIST *tables, const char *db_name,
const char *table_name, List_iterator<Item> *it);
static void free_cache_entry(TABLE *entry);
static void mysql_rm_tmp_tables(void);
static key_map get_key_map_from_key_list(TABLE *table,
......@@ -109,71 +111,75 @@ static void check_unused(void)
#define check_unused()
#endif
OPEN_TABLE_LIST *list_open_tables(THD *thd, const char *wild)
int list_open_tables(THD *thd,List<char> *tables, const char *db,
const char *wild)
{
int result = 0;
uint col_access=thd->col_access;
OPEN_TABLE_LIST **start_list, *open_list;
TABLE_LIST table_list;
char name[NAME_LEN*2];
DBUG_ENTER("list_open_tables");
VOID(pthread_mutex_lock(&LOCK_open));
bzero((char*) &table_list,sizeof(table_list));
start_list= &open_list;
open_list=0;
for (uint idx=0 ; result == 0 && idx < open_cache.records; idx++)
for (uint idx=0 ; idx < open_cache.records; idx++)
{
OPEN_TABLE_LIST *table;
TABLE *entry=(TABLE*) hash_element(&open_cache,idx);
if ((!entry->real_name))
continue; // Shouldn't happen
if (wild)
if ((!entry->real_name) || strcmp(entry->table_cache_key,db))
continue;
if (wild && wild[0] && wild_compare(entry->real_name,wild))
continue;
if (db && !(col_access & TABLE_ACLS))
{
strxmov(name,entry->table_cache_key,".",entry->real_name,NullS);
if (wild_compare(name,wild))
continue;
table_list.db= (char*) db;
table_list.real_name= entry->real_name;/*real name*/
table_list.grant.privilege=col_access;
if (check_grant(thd,TABLE_ACLS,&table_list,1))
continue;
}
/* need to check if he have't already listed it */
/* Check if user has SELECT privilege for any column in the table */
table_list.db= (char*) entry->table_cache_key;
table_list.real_name= entry->real_name;
table_list.grant.privilege=0;
if (check_table_access(thd,SELECT_ACL | EXTRA_ACL,&table_list))
continue;
/* need to check if we haven't already listed it */
for (table= open_list ; table ; table=table->next)
List_iterator<char> it(*tables);
char *table_name;
int check = 0;
while (check == 0 && (table_name=it++))
{
if (!strcmp(table->table,entry->real_name) &&
!strcmp(table->db,entry->table_cache_key))
{
if (entry->in_use)
table->in_use++;
if (entry->locked_by_name)
table->locked++;
break;
}
if (!strcmp(table_name,entry->real_name))
check++;
}
if (table)
if (check)
continue;
if (!(*start_list = (OPEN_TABLE_LIST *)
sql_alloc(sizeof(OPEN_TABLE_LIST)+entry->key_length)))
if (tables->push_back(thd->strdup(entry->real_name)))
{
open_list=0; // Out of memory
result = -1;
break;
}
(*start_list)->table=(strmov((*start_list)->db=(char*) ((*start_list)+1),
entry->table_cache_key)+1,
entry->real_name);
(*start_list)->in_use= entry->in_use ? 1 : 0;
(*start_list)->locked= entry->locked_by_name ? 1 : 0;
start_list= &(*start_list)->next;
}
VOID(pthread_mutex_unlock(&LOCK_open));
DBUG_RETURN(open_list);
DBUG_RETURN(result);
}
char*
query_table_status(THD *thd,const char *db,const char *table_name)
{
int cached = 0, in_use = 0;
char info[256];
for (uint idx=0 ; idx < open_cache.records; idx++)
{
TABLE *entry=(TABLE*) hash_element(&open_cache,idx);
if (strcmp(entry->table_cache_key,db) ||
strcmp(entry->real_name,table_name))
continue;
cached++;
if (entry->in_use)
in_use++;
}
sprintf(info, "cached=%d, in_use=%d", cached, in_use);
return thd->strdup(info);
}
......@@ -253,7 +259,7 @@ send_fields(THD *thd,List<Item> &list,uint flag)
if (my_net_write(&thd->net, (char*) packet->ptr(),packet->length()))
break; /* purecov: inspected */
}
send_eof(&thd->net);
send_eof(&thd->net,(test_flags & TEST_MIT_THREAD) ? 0: 1);
return 0;
err:
send_error(&thd->net,ER_OUT_OF_RESOURCES); /* purecov: inspected */
......@@ -424,9 +430,40 @@ void close_thread_tables(THD *thd, bool locked)
DBUG_PRINT("info", ("thd->open_tables=%p", thd->open_tables));
while (thd->open_tables)
found_old_table|=close_thread_table(thd, &thd->open_tables);
for (table=thd->open_tables ; table ; table=next)
{
next=table->next;
if (table->version != refresh_version ||
thd->version != refresh_version || !table->db_stat)
{
VOID(hash_delete(&open_cache,(byte*) table));
found_old_table=1;
}
else
{
if (table->flush_version != flush_version)
{
table->flush_version=flush_version;
table->file->extra(HA_EXTRA_FLUSH);
}
else
{
// Free memory and reset for next loop
table->file->extra(HA_EXTRA_RESET);
}
table->in_use=0;
if (unused_tables)
{
table->next=unused_tables; /* Link in last */
table->prev=unused_tables->prev;
unused_tables->prev=table;
table->prev->next=table;
}
else
unused_tables=table->next=table->prev=table;
}
}
thd->open_tables=0;
/* Free tables to hold down open files */
while (open_cache.records > table_cache_size && unused_tables)
VOID(hash_delete(&open_cache,(byte*) unused_tables)); /* purecov: tested */
......@@ -442,48 +479,6 @@ void close_thread_tables(THD *thd, bool locked)
DBUG_VOID_RETURN;
}
/* move one table to free list */
bool close_thread_table(THD *thd, TABLE **table_ptr)
{
DBUG_ENTER("close_thread_table");
bool found_old_table=0;
TABLE *table=*table_ptr;
*table_ptr=table->next;
if (table->version != refresh_version ||
thd->version != refresh_version || !table->db_stat)
{
VOID(hash_delete(&open_cache,(byte*) table));
found_old_table=1;
}
else
{
if (table->flush_version != flush_version)
{
table->flush_version=flush_version;
table->file->extra(HA_EXTRA_FLUSH);
}
else
{
// Free memory and reset for next loop
table->file->extra(HA_EXTRA_RESET);
}
table->in_use=0;
if (unused_tables)
{
table->next=unused_tables; /* Link in last */
table->prev=unused_tables->prev;
unused_tables->prev=table;
table->prev->next=table;
}
else
unused_tables=table->next=table->prev=table;
}
DBUG_RETURN(found_old_table);
}
/* Close and delete temporary tables */
void close_temporary(TABLE *table,bool delete_table)
......@@ -1837,7 +1832,7 @@ static key_map get_key_map_from_key_list(TABLE *table,
** Returns pointer to last inserted field if ok
****************************************************************************/
bool
static bool
insert_fields(THD *thd,TABLE_LIST *tables, const char *db_name,
const char *table_name, List_iterator<Item> *it)
{
......
sql/sql_show.cc
View file @ 27561841
......@@ -95,34 +95,38 @@ mysqld_show_dbs(THD *thd,const char *wild)
** List all open tables in a database
***************************************************************************/
int mysqld_show_open_tables(THD *thd,const char *wild)
int mysqld_show_open_tables(THD *thd,const char *db,const char *wild)
{
Item_string *field=new Item_string("",0);
List<Item> field_list;
OPEN_TABLE_LIST *open_list;
CONVERT *convert=thd->convert_set;
char *end,*table_name;
List<char> tables;
DBUG_ENTER("mysqld_show_open_tables");
field_list.push_back(new Item_empty_string("Database",NAME_LEN));
field_list.push_back(new Item_empty_string("Table",NAME_LEN));
field_list.push_back(new Item_int("In_use",0, 4));
field_list.push_back(new Item_int("Name_locked",0, 4));
field->name=(char*) thd->alloc(20+(uint) strlen(db)+(wild ? (uint) strlen(wild)+4:0));
end=strxmov(field->name,"Open_tables_in_",db,NullS);
if (wild && wild[0])
strxmov(end," (",wild,")",NullS);
field->max_length=NAME_LEN;
field_list.push_back(field);
field_list.push_back(new Item_empty_string("Comment",80));
if (send_fields(thd,field_list,1))
DBUG_RETURN(1);
if (!(open_list=list_open_tables(thd,wild)))
if (list_open_tables(thd,&tables,db,wild))
DBUG_RETURN(-1);
for ( ; open_list ; open_list=open_list->next)
List_iterator<char> it(tables);
while ((table_name=it++))
{
thd->packet.length(0);
net_store_data(&thd->packet,convert, open_list->db);
net_store_data(&thd->packet,convert, open_list->table);
net_store_data(&thd->packet,open_list->in_use);
net_store_data(&thd->packet,open_list->locked);
net_store_data(&thd->packet,table_name);
net_store_data(&thd->packet,query_table_status(thd,db,table_name));
if (my_net_write(&thd->net,(char*) thd->packet.ptr(),thd->packet.length()))
DBUG_RETURN(-1);
}
send_eof(&thd->net);
DBUG_RETURN(0);
}
......
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