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Viewing changes to storage/innodb_plugin/include/dict0mem.h

  • Committer: Package Import Robot
  • Author(s): Marc Deslauriers
  • Date: 2012-02-22 14:16:05 UTC
  • mto: This revision was merged to the branch mainline in revision 20.
  • Revision ID: package-import@ubuntu.com-20120222141605-nxlu9yzc6attylc2
Tags: upstream-5.1.61
Import upstream version 5.1.61

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storage/innodb_plugin/include/dict0mem.h
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                                                in table->flags. */
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/* @} */
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/** Tables could be chained together with Foreign key constraint. When
 
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first load the parent table, we would load all of its descedents.
 
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This could result in rescursive calls and out of stack error eventually.
 
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DICT_FK_MAX_RECURSIVE_LOAD defines the maximum number of recursive loads,
 
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when exceeded, the child table will not be loaded. It will be loaded when
 
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the foreign constraint check needs to be run. */
 
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#define DICT_FK_MAX_RECURSIVE_LOAD      250
 
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/** Similarly, when tables are chained together with foreign key constraints
 
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with on cascading delete/update clause, delete from parent table could
 
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result in recursive cascading calls. This defines the maximum number of
 
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such cascading deletes/updates allowed. When exceeded, the delete from
 
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parent table will fail, and user has to drop excessive foreign constraint
 
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before proceeds. */
 
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#define FK_MAX_CASCADE_DEL              300
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/**********************************************************************//**
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Creates a table memory object.
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                                dict_get_n_unique(index); we
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                                periodically calculate new
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                                estimates */
 
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        ib_int64_t*     stat_n_non_null_key_vals;
 
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                                /* approximate number of non-null key values
 
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                                for this index, for each column where
 
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                                n < dict_get_n_unique(index); This
 
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                                is used when innodb_stats_method is
 
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                                "nulls_ignored". */
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        ulint           stat_index_size;
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                                /*!< approximate index size in
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                                database pages */
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                                index, or 0 if the index existed
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                                when InnoDB was started up */
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#endif /* !UNIV_HOTBACKUP */
 
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#ifdef UNIV_BLOB_DEBUG
 
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        mutex_t         blobs_mutex;
 
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                                /*!< mutex protecting blobs */
 
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        void*           blobs;  /*!< map of (page_no,heap_no,field_no)
 
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                                to first_blob_page_no; protected by
 
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                                blobs_mutex; @see btr_blob_dbg_t */
 
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#endif /* UNIV_BLOB_DEBUG */
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#ifdef UNIV_DEBUG
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        ulint           magic_n;/*!< magic number */
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/** Value of dict_index_struct::magic_n */
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                                NOT allowed until this count gets to zero;
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                                MySQL does NOT itself check the number of
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                                open handles at drop */
 
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        unsigned        fk_max_recusive_level:8;
 
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                                /*!< maximum recursive level we support when
 
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                                loading tables chained together with FK
 
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                                constraints. If exceeds this level, we will
 
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                                stop loading child table into memory along with
 
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                                its parent table */
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        ulint           n_foreign_key_checks_running;
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                                /*!< count of how many foreign key check
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                                operations are currently being performed