/***************************************************************************** Copyright (c) 2005, 2012, Oracle and/or its affiliates. All Rights Reserved. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA *****************************************************************************/ /**************************************************//** @file handler/handler0alter.cc Smart ALTER TABLE *******************************************************/ #include <unireg.h> #include <mysqld_error.h> #include <sql_lex.h> // SQLCOM_CREATE_INDEX #include <innodb_priv.h> extern "C" { #include "log0log.h" #include "row0merge.h" #include "srv0srv.h" #include "trx0trx.h" #include "trx0roll.h" #include "ha_prototypes.h" #include "handler0alter.h" } #include "ha_innodb.h" /*************************************************************//** Copies an InnoDB column to a MySQL field. This function is adapted from row_sel_field_store_in_mysql_format(). */ static void innobase_col_to_mysql( /*==================*/ const dict_col_t* col, /*!< in: InnoDB column */ const uchar* data, /*!< in: InnoDB column data */ ulint len, /*!< in: length of data, in bytes */ Field* field) /*!< in/out: MySQL field */ { uchar* ptr; uchar* dest = field->ptr; ulint flen = field->pack_length(); switch (col->mtype) { case DATA_INT: ut_ad(len == flen); /* Convert integer data from Innobase to little-endian format, sign bit restored to normal */ for (ptr = dest + len; ptr != dest; ) { *--ptr = *data++; } if (!(col->prtype & DATA_UNSIGNED)) { ((byte*) dest)[len - 1] ^= 0x80; } break; case DATA_VARCHAR: case DATA_VARMYSQL: case DATA_BINARY: field->reset(); if (field->type() == MYSQL_TYPE_VARCHAR) { /* This is a >= 5.0.3 type true VARCHAR. Store the length of the data to the first byte or the first two bytes of dest. */ dest = row_mysql_store_true_var_len( dest, len, flen - field->key_length()); } /* Copy the actual data */ memcpy(dest, data, len); break; case DATA_BLOB: /* Store a pointer to the BLOB buffer to dest: the BLOB was already copied to the buffer in row_sel_store_mysql_rec */ row_mysql_store_blob_ref(dest, flen, data, len); break; #ifdef UNIV_DEBUG case DATA_MYSQL: ut_ad(flen >= len); ut_ad(DATA_MBMAXLEN(col->mbminmaxlen) >= DATA_MBMINLEN(col->mbminmaxlen)); ut_ad(DATA_MBMAXLEN(col->mbminmaxlen) > DATA_MBMINLEN(col->mbminmaxlen) || flen == len); memcpy(dest, data, len); break; default: case DATA_SYS_CHILD: case DATA_SYS: /* These column types should never be shipped to MySQL. */ ut_ad(0); case DATA_FIXBINARY: case DATA_FLOAT: case DATA_DOUBLE: case DATA_DECIMAL: /* Above are the valid column types for MySQL data. */ ut_ad(flen == len); /* fall through */ case DATA_CHAR: /* We may have flen > len when there is a shorter prefix on a CHAR column. */ ut_ad(flen >= len); #else /* UNIV_DEBUG */ default: #endif /* UNIV_DEBUG */ memcpy(dest, data, len); } } /*************************************************************//** Copies an InnoDB record to table->record[0]. */ extern "C" UNIV_INTERN void innobase_rec_to_mysql( /*==================*/ TABLE* table, /*!< in/out: MySQL table */ const rec_t* rec, /*!< in: record */ const dict_index_t* index, /*!< in: index */ const ulint* offsets) /*!< in: rec_get_offsets( rec, index, ...) */ { uint n_fields = table->s->fields; uint i; ut_ad(n_fields == dict_table_get_n_user_cols(index->table)); for (i = 0; i < n_fields; i++) { Field* field = table->field[i]; ulint ipos; ulint ilen; const uchar* ifield; field->reset(); ipos = dict_index_get_nth_col_or_prefix_pos(index, i, TRUE); if (UNIV_UNLIKELY(ipos == ULINT_UNDEFINED)) { null_field: field->set_null(); continue; } ifield = rec_get_nth_field(rec, offsets, ipos, &ilen); /* Assign the NULL flag */ if (ilen == UNIV_SQL_NULL) { ut_ad(field->real_maybe_null()); goto null_field; } field->set_notnull(); innobase_col_to_mysql( dict_field_get_col( dict_index_get_nth_field(index, ipos)), ifield, ilen, field); } } /*************************************************************//** Resets table->record[0]. */ extern "C" UNIV_INTERN void innobase_rec_reset( /*===============*/ TABLE* table) /*!< in/out: MySQL table */ { uint n_fields = table->s->fields; uint i; for (i = 0; i < n_fields; i++) { table->field[i]->set_default(); } } /******************************************************************//** Removes the filename encoding of a database and table name. */ static void innobase_convert_tablename( /*=======================*/ char* s) /*!< in: identifier; out: decoded identifier */ { uint errors; char* slash = strchr(s, '/'); if (slash) { char* t; /* Temporarily replace the '/' with NUL. */ *slash = 0; /* Convert the database name. */ strconvert(&my_charset_filename, s, system_charset_info, s, slash - s + 1, &errors); t = s + strlen(s); ut_ad(slash >= t); /* Append a '.' after the database name. */ *t++ = '.'; slash++; /* Convert the table name. */ strconvert(&my_charset_filename, slash, system_charset_info, t, slash - t + strlen(slash), &errors); } else { strconvert(&my_charset_filename, s, system_charset_info, s, strlen(s), &errors); } } /*******************************************************************//** This function checks that index keys are sensible. @return 0 or error number */ static int innobase_check_index_keys( /*======================*/ const KEY* key_info, /*!< in: Indexes to be created */ ulint num_of_keys, /*!< in: Number of indexes to be created */ const dict_table_t* table) /*!< in: Existing indexes */ { ulint key_num; ut_ad(key_info); ut_ad(num_of_keys); for (key_num = 0; key_num < num_of_keys; key_num++) { const KEY& key = key_info[key_num]; /* Check that the same index name does not appear twice in indexes to be created. */ for (ulint i = 0; i < key_num; i++) { const KEY& key2 = key_info[i]; if (0 == strcmp(key.name, key2.name)) { my_error(ER_WRONG_NAME_FOR_INDEX, MYF(0), key.name); return(ER_WRONG_NAME_FOR_INDEX); } } /* Check that the same index name does not already exist. */ for (const dict_index_t* index = dict_table_get_first_index(table); index; index = dict_table_get_next_index(index)) { if (0 == strcmp(key.name, index->name)) { my_error(ER_WRONG_NAME_FOR_INDEX, MYF(0), key.name); return(ER_WRONG_NAME_FOR_INDEX); } } /* Check that MySQL does not try to create a column prefix index field on an inappropriate data type and that the same column does not appear twice in the index. */ for (ulint i = 0; i < key.key_parts; i++) { const KEY_PART_INFO& key_part1 = key.key_part[i]; const Field* field = key_part1.field; ibool is_unsigned; switch (get_innobase_type_from_mysql_type( &is_unsigned, field)) { default: break; case DATA_INT: case DATA_FLOAT: case DATA_DOUBLE: case DATA_DECIMAL: if (field->type() == MYSQL_TYPE_VARCHAR) { if (key_part1.length >= field->pack_length() - ((Field_varstring*) field) ->length_bytes) { break; } } else { if (key_part1.length >= field->pack_length()) { break; } } my_error(ER_WRONG_KEY_COLUMN, MYF(0), field->field_name); return(ER_WRONG_KEY_COLUMN); } for (ulint j = 0; j < i; j++) { const KEY_PART_INFO& key_part2 = key.key_part[j]; if (strcmp(key_part1.field->field_name, key_part2.field->field_name)) { continue; } my_error(ER_WRONG_KEY_COLUMN, MYF(0), key_part1.field->field_name); return(ER_WRONG_KEY_COLUMN); } } } return(0); } /*******************************************************************//** Create index field definition for key part */ static void innobase_create_index_field_def( /*============================*/ KEY_PART_INFO* key_part, /*!< in: MySQL key definition */ mem_heap_t* heap, /*!< in: memory heap */ merge_index_field_t* index_field) /*!< out: index field definition for key_part */ { Field* field; ibool is_unsigned; ulint col_type; DBUG_ENTER("innobase_create_index_field_def"); ut_ad(key_part); ut_ad(index_field); field = key_part->field; ut_a(field); col_type = get_innobase_type_from_mysql_type(&is_unsigned, field); if (DATA_BLOB == col_type || (key_part->length < field->pack_length() && field->type() != MYSQL_TYPE_VARCHAR) || (field->type() == MYSQL_TYPE_VARCHAR && key_part->length < field->pack_length() - ((Field_varstring*)field)->length_bytes)) { index_field->prefix_len = key_part->length; } else { index_field->prefix_len = 0; } index_field->field_name = mem_heap_strdup(heap, field->field_name); DBUG_VOID_RETURN; } /*******************************************************************//** Create index definition for key */ static void innobase_create_index_def( /*======================*/ KEY* key, /*!< in: key definition */ bool new_primary, /*!< in: TRUE=generating a new primary key on the table */ bool key_primary, /*!< in: TRUE if this key is a primary key */ merge_index_def_t* index, /*!< out: index definition */ mem_heap_t* heap) /*!< in: heap where memory is allocated */ { ulint i; ulint len; ulint n_fields = key->key_parts; char* index_name; DBUG_ENTER("innobase_create_index_def"); index->fields = (merge_index_field_t*) mem_heap_alloc( heap, n_fields * sizeof *index->fields); index->ind_type = 0; index->n_fields = n_fields; len = strlen(key->name) + 1; index->name = index_name = (char*) mem_heap_alloc(heap, len + !new_primary); if (UNIV_LIKELY(!new_primary)) { *index_name++ = TEMP_INDEX_PREFIX; } memcpy(index_name, key->name, len); if (key->flags & HA_NOSAME) { index->ind_type |= DICT_UNIQUE; } if (key_primary) { index->ind_type |= DICT_CLUSTERED; } for (i = 0; i < n_fields; i++) { innobase_create_index_field_def(&key->key_part[i], heap, &index->fields[i]); } DBUG_VOID_RETURN; } /*******************************************************************//** Copy index field definition */ static void innobase_copy_index_field_def( /*==========================*/ const dict_field_t* field, /*!< in: definition to copy */ merge_index_field_t* index_field) /*!< out: copied definition */ { DBUG_ENTER("innobase_copy_index_field_def"); DBUG_ASSERT(field != NULL); DBUG_ASSERT(index_field != NULL); index_field->field_name = field->name; index_field->prefix_len = field->prefix_len; DBUG_VOID_RETURN; } /*******************************************************************//** Copy index definition for the index */ static void innobase_copy_index_def( /*====================*/ const dict_index_t* index, /*!< in: index definition to copy */ merge_index_def_t* new_index,/*!< out: Index definition */ mem_heap_t* heap) /*!< in: heap where allocated */ { ulint n_fields; ulint i; DBUG_ENTER("innobase_copy_index_def"); /* Note that we take only those fields that user defined to be in the index. In the internal representation more colums were added and those colums are not copied .*/ n_fields = index->n_user_defined_cols; new_index->fields = (merge_index_field_t*) mem_heap_alloc( heap, n_fields * sizeof *new_index->fields); /* When adding a PRIMARY KEY, we may convert a previous clustered index to a secondary index (UNIQUE NOT NULL). */ new_index->ind_type = index->type & ~DICT_CLUSTERED; new_index->n_fields = n_fields; new_index->name = index->name; for (i = 0; i < n_fields; i++) { innobase_copy_index_field_def(&index->fields[i], &new_index->fields[i]); } DBUG_VOID_RETURN; } /*******************************************************************//** Create an index table where indexes are ordered as follows: IF a new primary key is defined for the table THEN 1) New primary key 2) Original secondary indexes 3) New secondary indexes ELSE 1) All new indexes in the order they arrive from MySQL ENDIF @return key definitions or NULL */ static merge_index_def_t* innobase_create_key_def( /*====================*/ trx_t* trx, /*!< in: trx */ const dict_table_t*table, /*!< in: table definition */ mem_heap_t* heap, /*!< in: heap where space for key definitions are allocated */ KEY* key_info, /*!< in: Indexes to be created */ ulint& n_keys) /*!< in/out: Number of indexes to be created */ { ulint i = 0; merge_index_def_t* indexdef; merge_index_def_t* indexdefs; bool new_primary; DBUG_ENTER("innobase_create_key_def"); indexdef = indexdefs = (merge_index_def_t*) mem_heap_alloc(heap, sizeof *indexdef * (n_keys + UT_LIST_GET_LEN(table->indexes))); /* If there is a primary key, it is always the first index defined for the table. */ new_primary = !my_strcasecmp(system_charset_info, key_info->name, "PRIMARY"); /* If there is a UNIQUE INDEX consisting entirely of NOT NULL columns and if the index does not contain column prefix(es) (only prefix/part of the column is indexed), MySQL will treat the index as a PRIMARY KEY unless the table already has one. */ if (!new_primary && (key_info->flags & HA_NOSAME) && (!(key_info->flags & HA_KEY_HAS_PART_KEY_SEG)) && row_table_got_default_clust_index(table)) { uint key_part = key_info->key_parts; new_primary = TRUE; while (key_part--) { if (key_info->key_part[key_part].key_type & FIELDFLAG_MAYBE_NULL) { new_primary = FALSE; break; } } } if (new_primary) { const dict_index_t* index; /* Create the PRIMARY key index definition */ innobase_create_index_def(&key_info[i++], TRUE, TRUE, indexdef++, heap); row_mysql_lock_data_dictionary(trx); index = dict_table_get_first_index(table); /* Copy the index definitions of the old table. Skip the old clustered index if it is a generated clustered index or a PRIMARY KEY. If the clustered index is a UNIQUE INDEX, it must be converted to a secondary index. */ if (dict_index_get_nth_col(index, 0)->mtype == DATA_SYS || !my_strcasecmp(system_charset_info, index->name, "PRIMARY")) { index = dict_table_get_next_index(index); } while (index) { innobase_copy_index_def(index, indexdef++, heap); index = dict_table_get_next_index(index); } row_mysql_unlock_data_dictionary(trx); } /* Create definitions for added secondary indexes. */ while (i < n_keys) { innobase_create_index_def(&key_info[i++], new_primary, FALSE, indexdef++, heap); } n_keys = indexdef - indexdefs; DBUG_RETURN(indexdefs); } /*******************************************************************//** Check each index column size, make sure they do not exceed the max limit @return HA_ERR_INDEX_COL_TOO_LONG if index column size exceeds limit */ static int innobase_check_column_length( /*=========================*/ const dict_table_t*table, /*!< in: table definition */ const KEY* key_info) /*!< in: Indexes to be created */ { ulint max_col_len = DICT_MAX_FIELD_LEN_BY_FORMAT(table); for (ulint key_part = 0; key_part < key_info->key_parts; key_part++) { if (key_info->key_part[key_part].length > max_col_len) { my_error(ER_INDEX_COLUMN_TOO_LONG, MYF(0), max_col_len); return(HA_ERR_INDEX_COL_TOO_LONG); } } return(0); } /*******************************************************************//** Create a temporary tablename using query id, thread id, and id @return temporary tablename */ static char* innobase_create_temporary_tablename( /*================================*/ mem_heap_t* heap, /*!< in: memory heap */ char id, /*!< in: identifier [0-9a-zA-Z] */ const char* table_name) /*!< in: table name */ { char* name; ulint len; static const char suffix[] = "@0023 "; /* "# " */ len = strlen(table_name); name = (char*) mem_heap_alloc(heap, len + sizeof suffix); memcpy(name, table_name, len); memcpy(name + len, suffix, sizeof suffix); name[len + (sizeof suffix - 2)] = id; return(name); } class ha_innobase_add_index : public handler_add_index { public: /** table where the indexes are being created */ dict_table_t* indexed_table; ha_innobase_add_index(TABLE* table, KEY* key_info, uint num_of_keys, dict_table_t* indexed_table_arg) : handler_add_index(table, key_info, num_of_keys), indexed_table (indexed_table_arg) {} ~ha_innobase_add_index() {} }; /*******************************************************************//** Create indexes. @return 0 or error number */ UNIV_INTERN int ha_innobase::add_index( /*===================*/ TABLE* table, /*!< in: Table where indexes are created */ KEY* key_info, /*!< in: Indexes to be created */ uint num_of_keys, /*!< in: Number of indexes to be created */ handler_add_index** add) /*!< out: context */ { dict_index_t** index; /*!< Index to be created */ dict_table_t* indexed_table; /*!< Table where indexes are created */ merge_index_def_t* index_defs; /*!< Index definitions */ mem_heap_t* heap; /*!< Heap for index definitions */ trx_t* trx; /*!< Transaction */ ulint num_of_idx; ulint num_created = 0; ibool dict_locked = FALSE; ulint new_primary; int error; DBUG_ENTER("ha_innobase::add_index"); ut_a(table); ut_a(key_info); ut_a(num_of_keys); *add = NULL; if (srv_created_new_raw || srv_force_recovery) { DBUG_RETURN(HA_ERR_WRONG_COMMAND); } update_thd(); /* In case MySQL calls this in the middle of a SELECT query, release possible adaptive hash latch to avoid deadlocks of threads. */ trx_search_latch_release_if_reserved(prebuilt->trx); /* Check if the index name is reserved. */ if (innobase_index_name_is_reserved(user_thd, key_info, num_of_keys)) { DBUG_RETURN(-1); } indexed_table = dict_table_get(prebuilt->table->name, FALSE); if (UNIV_UNLIKELY(!indexed_table)) { DBUG_RETURN(HA_ERR_NO_SUCH_TABLE); } ut_a(indexed_table == prebuilt->table); if (indexed_table->tablespace_discarded) { DBUG_RETURN(-1); } /* Check that index keys are sensible */ error = innobase_check_index_keys(key_info, num_of_keys, prebuilt->table); if (UNIV_UNLIKELY(error)) { DBUG_RETURN(error); } /* Check each index's column length to make sure they do not exceed limit */ for (ulint i = 0; i < num_of_keys; i++) { error = innobase_check_column_length(prebuilt->table, &key_info[i]); if (error) { DBUG_RETURN(error); } } heap = mem_heap_create(1024); trx_start_if_not_started(prebuilt->trx); /* Create a background transaction for the operations on the data dictionary tables. */ trx = innobase_trx_allocate(user_thd); trx_start_if_not_started(trx); /* Create table containing all indexes to be built in this alter table add index so that they are in the correct order in the table. */ num_of_idx = num_of_keys; index_defs = innobase_create_key_def( trx, prebuilt->table, heap, key_info, num_of_idx); new_primary = DICT_CLUSTERED & index_defs[0].ind_type; /* Allocate memory for dictionary index definitions */ index = (dict_index_t**) mem_heap_alloc( heap, num_of_idx * sizeof *index); /* Flag this transaction as a dictionary operation, so that the data dictionary will be locked in crash recovery. */ trx_set_dict_operation(trx, TRX_DICT_OP_INDEX); /* Acquire a lock on the table before creating any indexes. */ error = row_merge_lock_table(prebuilt->trx, prebuilt->table, new_primary ? LOCK_X : LOCK_S); if (UNIV_UNLIKELY(error != DB_SUCCESS)) { goto error_handling; } /* Latch the InnoDB data dictionary exclusively so that no deadlocks or lock waits can happen in it during an index create operation. */ row_mysql_lock_data_dictionary(trx); dict_locked = TRUE; ut_d(dict_table_check_for_dup_indexes(prebuilt->table, TRUE)); /* If a new primary key is defined for the table we need to drop the original table and rebuild all indexes. */ if (UNIV_UNLIKELY(new_primary)) { /* This transaction should be the only one operating on the table. */ ut_a(prebuilt->table->n_mysql_handles_opened == 1); char* new_table_name = innobase_create_temporary_tablename( heap, '1', prebuilt->table->name); /* Clone the table. */ trx_set_dict_operation(trx, TRX_DICT_OP_TABLE); indexed_table = row_merge_create_temporary_table( new_table_name, index_defs, prebuilt->table, trx); if (!indexed_table) { switch (trx->error_state) { case DB_TABLESPACE_ALREADY_EXISTS: case DB_DUPLICATE_KEY: innobase_convert_tablename(new_table_name); my_error(HA_ERR_TABLE_EXIST, MYF(0), new_table_name); error = HA_ERR_TABLE_EXIST; break; default: error = convert_error_code_to_mysql( trx->error_state, prebuilt->table->flags, user_thd); } ut_d(dict_table_check_for_dup_indexes(prebuilt->table, TRUE)); mem_heap_free(heap); trx_general_rollback_for_mysql(trx, NULL); row_mysql_unlock_data_dictionary(trx); trx_free_for_mysql(trx); trx_commit_for_mysql(prebuilt->trx); DBUG_RETURN(error); } trx->table_id = indexed_table->id; } /* Create the indexes in SYS_INDEXES and load into dictionary. */ for (num_created = 0; num_created < num_of_idx; num_created++) { index[num_created] = row_merge_create_index( trx, indexed_table, &index_defs[num_created]); if (!index[num_created]) { error = trx->error_state; goto error_handling; } } ut_ad(error == DB_SUCCESS); /* Commit the data dictionary transaction in order to release the table locks on the system tables. This means that if MySQL crashes while creating a new primary key inside row_merge_build_indexes(), indexed_table will not be dropped by trx_rollback_active(). It will have to be recovered or dropped by the database administrator. */ trx_commit_for_mysql(trx); row_mysql_unlock_data_dictionary(trx); dict_locked = FALSE; ut_a(trx->n_active_thrs == 0); ut_a(UT_LIST_GET_LEN(trx->signals) == 0); if (UNIV_UNLIKELY(new_primary)) { /* A primary key is to be built. Acquire an exclusive table lock also on the table that is being created. */ ut_ad(indexed_table != prebuilt->table); error = row_merge_lock_table(prebuilt->trx, indexed_table, LOCK_X); if (UNIV_UNLIKELY(error != DB_SUCCESS)) { goto error_handling; } } /* Read the clustered index of the table and build indexes based on this information using temporary files and merge sort. */ error = row_merge_build_indexes(prebuilt->trx, prebuilt->table, indexed_table, index, num_of_idx, table); error_handling: /* After an error, remove all those index definitions from the dictionary which were defined. */ switch (error) { case DB_SUCCESS: ut_a(!dict_locked); ut_d(mutex_enter(&dict_sys->mutex)); ut_d(dict_table_check_for_dup_indexes(prebuilt->table, TRUE)); ut_d(mutex_exit(&dict_sys->mutex)); *add = new ha_innobase_add_index(table, key_info, num_of_keys, indexed_table); break; case DB_TOO_BIG_RECORD: my_error(HA_ERR_TO_BIG_ROW, MYF(0)); goto error; case DB_PRIMARY_KEY_IS_NULL: my_error(ER_PRIMARY_CANT_HAVE_NULL, MYF(0)); /* fall through */ case DB_DUPLICATE_KEY: error: prebuilt->trx->error_info = NULL; /* fall through */ default: trx->error_state = DB_SUCCESS; if (new_primary) { if (indexed_table != prebuilt->table) { row_merge_drop_table(trx, indexed_table); } } else { if (!dict_locked) { row_mysql_lock_data_dictionary(trx); dict_locked = TRUE; } row_merge_drop_indexes(trx, indexed_table, index, num_created); } } trx_commit_for_mysql(trx); if (prebuilt->trx) { trx_commit_for_mysql(prebuilt->trx); } if (dict_locked) { row_mysql_unlock_data_dictionary(trx); } trx_free_for_mysql(trx); mem_heap_free(heap); /* There might be work for utility threads.*/ srv_active_wake_master_thread(); DBUG_RETURN(convert_error_code_to_mysql(error, prebuilt->table->flags, user_thd)); } /*******************************************************************//** Finalize or undo add_index(). @return 0 or error number */ UNIV_INTERN int ha_innobase::final_add_index( /*=========================*/ handler_add_index* add_arg,/*!< in: context from add_index() */ bool commit) /*!< in: true=commit, false=rollback */ { ha_innobase_add_index* add; trx_t* trx; int err = 0; DBUG_ENTER("ha_innobase::final_add_index"); ut_ad(add_arg); add = static_cast<class ha_innobase_add_index*>(add_arg); /* Create a background transaction for the operations on the data dictionary tables. */ trx = innobase_trx_allocate(user_thd); trx_start_if_not_started(trx); /* Flag this transaction as a dictionary operation, so that the data dictionary will be locked in crash recovery. */ trx_set_dict_operation(trx, TRX_DICT_OP_INDEX); /* Latch the InnoDB data dictionary exclusively so that no deadlocks or lock waits can happen in it during an index create operation. */ row_mysql_lock_data_dictionary(trx); if (add->indexed_table != prebuilt->table) { ulint error; /* We copied the table (new_primary). */ if (commit) { mem_heap_t* heap; char* tmp_name; heap = mem_heap_create(1024); /* A new primary key was defined for the table and there was no error at this point. We can now rename the old table as a temporary table, rename the new temporary table as the old table and drop the old table. */ tmp_name = innobase_create_temporary_tablename( heap, '2', prebuilt->table->name); error = row_merge_rename_tables( prebuilt->table, add->indexed_table, tmp_name, trx); switch (error) { case DB_TABLESPACE_ALREADY_EXISTS: case DB_DUPLICATE_KEY: innobase_convert_tablename(tmp_name); my_error(HA_ERR_TABLE_EXIST, MYF(0), tmp_name); err = HA_ERR_TABLE_EXIST; break; default: err = convert_error_code_to_mysql( error, prebuilt->table->flags, user_thd); break; } mem_heap_free(heap); } if (!commit || err) { error = row_merge_drop_table(trx, add->indexed_table); trx_commit_for_mysql(prebuilt->trx); } else { dict_table_t* old_table = prebuilt->table; trx_commit_for_mysql(prebuilt->trx); row_prebuilt_free(prebuilt, TRUE); error = row_merge_drop_table(trx, old_table); add->indexed_table->n_mysql_handles_opened++; prebuilt = row_create_prebuilt(add->indexed_table, 0 /* XXX Do we know the mysql_row_len here? Before the addition of this parameter to row_create_prebuilt() the mysql_row_len member was left 0 (from zalloc) in the prebuilt object. */); } err = convert_error_code_to_mysql( error, prebuilt->table->flags, user_thd); } else { /* We created secondary indexes (!new_primary). */ if (commit) { err = convert_error_code_to_mysql( row_merge_rename_indexes(trx, prebuilt->table), prebuilt->table->flags, user_thd); } if (!commit || err) { dict_index_t* index; dict_index_t* next_index; for (index = dict_table_get_first_index( prebuilt->table); index; index = next_index) { next_index = dict_table_get_next_index(index); if (*index->name == TEMP_INDEX_PREFIX) { row_merge_drop_index( index, prebuilt->table, trx); } } } } /* If index is successfully built, we will need to rebuild index translation table. Set valid index entry count in the translation table to zero. */ if (err == 0 && commit) { share->idx_trans_tbl.index_count = 0; } trx_commit_for_mysql(trx); if (prebuilt->trx) { trx_commit_for_mysql(prebuilt->trx); } ut_d(dict_table_check_for_dup_indexes(prebuilt->table, TRUE)); row_mysql_unlock_data_dictionary(trx); trx_free_for_mysql(trx); /* There might be work for utility threads.*/ srv_active_wake_master_thread(); delete add; DBUG_RETURN(err); } /*******************************************************************//** Prepare to drop some indexes of a table. @return 0 or error number */ UNIV_INTERN int ha_innobase::prepare_drop_index( /*============================*/ TABLE* table, /*!< in: Table where indexes are dropped */ uint* key_num, /*!< in: Key nums to be dropped */ uint num_of_keys) /*!< in: Number of keys to be dropped */ { trx_t* trx; int err = 0; uint n_key; DBUG_ENTER("ha_innobase::prepare_drop_index"); ut_ad(table); ut_ad(key_num); ut_ad(num_of_keys); if (srv_created_new_raw || srv_force_recovery) { DBUG_RETURN(HA_ERR_WRONG_COMMAND); } update_thd(); trx_search_latch_release_if_reserved(prebuilt->trx); trx = prebuilt->trx; /* Test and mark all the indexes to be dropped */ row_mysql_lock_data_dictionary(trx); ut_d(dict_table_check_for_dup_indexes(prebuilt->table, TRUE)); /* Check that none of the indexes have previously been flagged for deletion. */ { const dict_index_t* index = dict_table_get_first_index(prebuilt->table); do { ut_a(!index->to_be_dropped); index = dict_table_get_next_index(index); } while (index); } for (n_key = 0; n_key < num_of_keys; n_key++) { const KEY* key; dict_index_t* index; key = table->key_info + key_num[n_key]; index = dict_table_get_index_on_name_and_min_id( prebuilt->table, key->name); if (!index) { sql_print_error("InnoDB could not find key n:o %u " "with name %s for table %s", key_num[n_key], key ? key->name : "NULL", prebuilt->table->name); err = HA_ERR_KEY_NOT_FOUND; goto func_exit; } /* Refuse to drop the clustered index. It would be better to automatically generate a clustered index, but mysql_alter_table() will call this method only after ha_innobase::add_index(). */ if (dict_index_is_clust(index)) { my_error(ER_REQUIRES_PRIMARY_KEY, MYF(0)); err = -1; goto func_exit; } rw_lock_x_lock(dict_index_get_lock(index)); index->to_be_dropped = TRUE; rw_lock_x_unlock(dict_index_get_lock(index)); } /* If FOREIGN_KEY_CHECKS = 1 you may not drop an index defined for a foreign key constraint because InnoDB requires that both tables contain indexes for the constraint. Such index can be dropped only if FOREIGN_KEY_CHECKS is set to 0. Note that CREATE INDEX id ON table does a CREATE INDEX and DROP INDEX, and we can ignore here foreign keys because a new index for the foreign key has already been created. We check for the foreign key constraints after marking the candidate indexes for deletion, because when we check for an equivalent foreign index we don't want to select an index that is later deleted. */ if (trx->check_foreigns && thd_sql_command(user_thd) != SQLCOM_CREATE_INDEX) { dict_index_t* index; for (index = dict_table_get_first_index(prebuilt->table); index; index = dict_table_get_next_index(index)) { dict_foreign_t* foreign; if (!index->to_be_dropped) { continue; } /* Check if the index is referenced. */ foreign = dict_table_get_referenced_constraint( prebuilt->table, index); if (foreign) { index_needed: trx_set_detailed_error( trx, "Index needed in foreign key " "constraint"); trx->error_info = index; err = HA_ERR_DROP_INDEX_FK; break; } else { /* Check if this index references some other table */ foreign = dict_table_get_foreign_constraint( prebuilt->table, index); if (foreign) { ut_a(foreign->foreign_index == index); /* Search for an equivalent index that the foreign key constraint could use if this index were to be deleted. */ if (!dict_foreign_find_equiv_index( foreign)) { goto index_needed; } } } } } else if (thd_sql_command(user_thd) == SQLCOM_CREATE_INDEX) { /* This is a drop of a foreign key constraint index that was created by MySQL when the constraint was added. MySQL does this when the user creates an index explicitly which can be used in place of the automatically generated index. */ dict_index_t* index; for (index = dict_table_get_first_index(prebuilt->table); index; index = dict_table_get_next_index(index)) { dict_foreign_t* foreign; if (!index->to_be_dropped) { continue; } /* Check if this index references some other table */ foreign = dict_table_get_foreign_constraint( prebuilt->table, index); if (foreign == NULL) { continue; } ut_a(foreign->foreign_index == index); /* Search for an equivalent index that the foreign key constraint could use if this index were to be deleted. */ if (!dict_foreign_find_equiv_index(foreign)) { trx_set_detailed_error( trx, "Index needed in foreign key " "constraint"); trx->error_info = foreign->foreign_index; err = HA_ERR_DROP_INDEX_FK; break; } } } func_exit: if (err) { /* Undo our changes since there was some sort of error. */ dict_index_t* index = dict_table_get_first_index(prebuilt->table); do { rw_lock_x_lock(dict_index_get_lock(index)); index->to_be_dropped = FALSE; rw_lock_x_unlock(dict_index_get_lock(index)); index = dict_table_get_next_index(index); } while (index); } ut_d(dict_table_check_for_dup_indexes(prebuilt->table, TRUE)); row_mysql_unlock_data_dictionary(trx); DBUG_RETURN(err); } /*******************************************************************//** Drop the indexes that were passed to a successful prepare_drop_index(). @return 0 or error number */ UNIV_INTERN int ha_innobase::final_drop_index( /*==========================*/ TABLE* table) /*!< in: Table where indexes are dropped */ { dict_index_t* index; /*!< Index to be dropped */ trx_t* trx; /*!< Transaction */ int err; DBUG_ENTER("ha_innobase::final_drop_index"); ut_ad(table); if (srv_created_new_raw || srv_force_recovery) { DBUG_RETURN(HA_ERR_WRONG_COMMAND); } update_thd(); trx_search_latch_release_if_reserved(prebuilt->trx); trx_start_if_not_started(prebuilt->trx); /* Create a background transaction for the operations on the data dictionary tables. */ trx = innobase_trx_allocate(user_thd); trx_start_if_not_started(trx); /* Flag this transaction as a dictionary operation, so that the data dictionary will be locked in crash recovery. */ trx_set_dict_operation(trx, TRX_DICT_OP_INDEX); /* Lock the table exclusively, to ensure that no active transaction depends on an index that is being dropped. */ err = convert_error_code_to_mysql( row_merge_lock_table(prebuilt->trx, prebuilt->table, LOCK_X), prebuilt->table->flags, user_thd); row_mysql_lock_data_dictionary(trx); ut_d(dict_table_check_for_dup_indexes(prebuilt->table, TRUE)); if (UNIV_UNLIKELY(err)) { /* Unmark the indexes to be dropped. */ for (index = dict_table_get_first_index(prebuilt->table); index; index = dict_table_get_next_index(index)) { rw_lock_x_lock(dict_index_get_lock(index)); index->to_be_dropped = FALSE; rw_lock_x_unlock(dict_index_get_lock(index)); } goto func_exit; } /* Drop indexes marked to be dropped */ index = dict_table_get_first_index(prebuilt->table); while (index) { dict_index_t* next_index; next_index = dict_table_get_next_index(index); if (index->to_be_dropped) { row_merge_drop_index(index, prebuilt->table, trx); } index = next_index; } /* Check that all flagged indexes were dropped. */ for (index = dict_table_get_first_index(prebuilt->table); index; index = dict_table_get_next_index(index)) { ut_a(!index->to_be_dropped); } /* We will need to rebuild index translation table. Set valid index entry count in the translation table to zero */ share->idx_trans_tbl.index_count = 0; func_exit: ut_d(dict_table_check_for_dup_indexes(prebuilt->table, TRUE)); trx_commit_for_mysql(trx); trx_commit_for_mysql(prebuilt->trx); row_mysql_unlock_data_dictionary(trx); /* Flush the log to reduce probability that the .frm files and the InnoDB data dictionary get out-of-sync if the user runs with innodb_flush_log_at_trx_commit = 0 */ log_buffer_flush_to_disk(); trx_free_for_mysql(trx); /* Tell the InnoDB server that there might be work for utility threads: */ srv_active_wake_master_thread(); DBUG_RETURN(err); }