diff options
Diffstat (limited to 'innobase/include/trx0trx.h')
| -rw-r--r-- | innobase/include/trx0trx.h | 46 |
1 files changed, 44 insertions, 2 deletions
diff --git a/innobase/include/trx0trx.h b/innobase/include/trx0trx.h index 9b29c481b6d..874b126e47c 100644 --- a/innobase/include/trx0trx.h +++ b/innobase/include/trx0trx.h @@ -327,6 +327,7 @@ struct trx_struct{ time_t start_time; /* time the trx object was created or the state last time became TRX_ACTIVE */ + ulint isolation_level;/* TRX_ISO_REPEATABLE_READ, ... */ ibool check_foreigns; /* normally TRUE, but if the user wants to suppress foreign key checks, (in table imports, for example) we @@ -350,6 +351,9 @@ struct trx_struct{ /*------------------------------*/ void* mysql_thd; /* MySQL thread handle corresponding to this trx, or NULL */ + char** mysql_query_str;/* pointer to the field in mysqld_thd + which contains the pointer to the + current SQL query string */ char* mysql_log_file_name; /* if MySQL binlog is used, this field contains a pointer to the latest file @@ -371,6 +375,9 @@ struct trx_struct{ replication has processed */ os_thread_id_t mysql_thread_id;/* id of the MySQL thread associated with this transaction object */ + ulint mysql_process_no;/* since in Linux, 'top' reports + process id's and not thread id's, we + store the process number too */ /*------------------------------*/ ulint n_mysql_tables_in_use; /* number of Innobase tables used in the processing of the current @@ -379,9 +386,9 @@ struct trx_struct{ /* how many tables the current SQL statement uses, except those in consistent read */ - ibool has_dict_foreign_key_check_lock; + ibool has_dict_operation_lock; /* TRUE if the trx currently holds - an s-lock on dict_foreign_... */ + an s-lock on dict_operation_lock */ ibool has_search_latch; /* TRUE if this trx has latched the search system latch in S-mode */ @@ -523,6 +530,41 @@ struct trx_struct{ #define TRX_QUE_ROLLING_BACK 3 /* transaction is rolling back */ #define TRX_QUE_COMMITTING 4 /* transaction is committing */ +/* Transaction isolation levels */ +#define TRX_ISO_READ_UNCOMMITTED 1 /* dirty read: non-locking + SELECTs are performed so that + we do not look at a possible + earlier version of a record; + thus they are not 'consistent' + reads under this isolation + level; otherwise like level + 2 */ + +#define TRX_ISO_READ_COMMITTED 2 /* somewhat Oracle-like + isolation, except that in + range UPDATE and DELETE we + must block phantom rows + with next-key locks; + SELECT ... FOR UPDATE and ... + LOCK IN SHARE MODE only lock + the index records, NOT the + gaps before them, and thus + allow free inserting; + each consistent read reads its + own snapshot */ + +#define TRX_ISO_REPEATABLE_READ 3 /* this is the default; + all consistent reads in the + same trx read the same + snapshot; + full next-key locking used + in locking reads to block + insertions into gaps */ + +#define TRX_ISO_SERIALIZABLE 4 /* all plain SELECTs are + converted to LOCK IN SHARE + MODE reads */ + /* Types of a trx signal */ #define TRX_SIG_NO_SIGNAL 100 #define TRX_SIG_TOTAL_ROLLBACK 1 |