mysql - 在只读事务中创建临时表 - MYSQL 5.7

Question

我目前正在协助将当前针对 mysql 5.5 DB 运行的应用程序迁移到 mysql 5.7 的集成测试。我们遇到了与在 mysql 5.5 中优化的功能相关的问题，通过将某些部分封装在只读事务中现在抛出以下错误，运行速度提高了约 30%:

Error Code: 1792 Cannot execute statement in a READ ONLY transaction.

我已经在互联网上搜索并没有找到任何解决方案。我知道在 mysql 5.6 documentation 中添加了相关限制提到:

"In read-only mode, it remains possible to change tables created with the TEMPORARY keyword using DML statements. Changes made with DDL statements are not permitted, just as with permanent tables."

这给我们带来了一个主要限制，因为其中一些只读事务调用创建临时表的存储过程，并且我们无法重写应用程序，因为这种只读优化很普遍。

本质上，我们希望找到一种解决方法或一种我们可以调整的配置，以允许下面的示例不给出只读错误。

START TRANSACTION READ only;
CREATE TEMPORARY TABLE IF NOT EXISTS table1 (account_id INT(10) UNSIGNED);
ROLLBACK;

事先创建表不是一个选项，如果需要，下面的 mysql 服务器 session 变量。任何帮助将非常感激!

session 变量:

Variable_name   Value
auto_increment_increment    1
auto_increment_offset   1
autocommit  ON
automatic_sp_privileges ON
avoid_temporal_upgrade  OFF
back_log    80
basedir C:\\Program Files\\MySQL\\MySQL Server 5.7\\
big_tables  OFF
bind_address    *
binlog_cache_size   32768
binlog_checksum CRC32
binlog_direct_non_transactional_updates OFF
binlog_error_action ABORT_SERVER
binlog_format   ROW
binlog_group_commit_sync_delay  0
binlog_group_commit_sync_no_delay_count 0
binlog_gtid_simple_recovery ON
binlog_max_flush_queue_time 0
binlog_order_commits    ON
binlog_row_image    FULL
binlog_rows_query_log_events    OFF
binlog_stmt_cache_size  32768
binlog_transaction_dependency_history_size  25000
binlog_transaction_dependency_tracking  COMMIT_ORDER
block_encryption_mode   aes-128-ecb
bulk_insert_buffer_size 8388608
character_set_client    utf8
character_set_connection    utf8
character_set_database  utf8
character_set_filesystem    binary
character_set_results   utf8
character_set_server    utf8
character_set_system    utf8
character_sets_dir  C:\\Program Files\\MySQL\\MySQL Server 5.7\\share\\charsets\\
check_proxy_users   OFF
collation_connection    utf8_general_ci
collation_database  utf8_general_ci
collation_server    utf8_general_ci
completion_type NO_CHAIN
concurrent_insert   AUTO
connect_timeout 10
core_file   OFF
datadir C:\\ProgramData\\MySQL\\MySQL Server 5.7\\Data\\
date_format %Y-%m-%d
datetime_format %Y-%m-%d %H:%i:%s
default_authentication_plugin   mysql_native_password
default_password_lifetime   0
default_storage_engine  InnoDB
default_tmp_storage_engine  InnoDB
default_week_format 0
delay_key_write ON
delayed_insert_limit    100
delayed_insert_timeout  300
delayed_queue_size  1000
disabled_storage_engines    
disconnect_on_expired_password  ON
div_precision_increment 4
end_markers_in_json OFF
enforce_gtid_consistency    OFF
eq_range_index_dive_limit   200
error_count 0
event_scheduler OFF
expire_logs_days    0
explicit_defaults_for_timestamp OFF
external_user   
flush   OFF
flush_time  0
foreign_key_checks  ON
ft_boolean_syntax   "+ -><()~*:""""&|"
ft_max_word_len 84
ft_min_word_len 4
ft_query_expansion_limit    20
ft_stopword_file    (built-in)
general_log OFF
general_log_file    DESKTOP-11VS9FN.log
group_concat_max_len    1024
gtid_executed_compression_period    1000
gtid_mode   OFF
gtid_next   AUTOMATIC
gtid_owned  
gtid_purged 
have_compress   YES
have_crypt  NO
have_dynamic_loading    YES
have_geometry   YES
have_openssl    DISABLED
have_profiling  YES
have_query_cache    YES
have_rtree_keys YES
have_ssl    DISABLED
have_statement_timeout  YES
have_symlink    YES
host_cache_size 279
hostname    BLUEOA-LP005
identity    0
ignore_builtin_innodb   OFF
ignore_db_dirs  
init_connect    
init_file   
init_slave  
innodb_adaptive_flushing    ON
innodb_adaptive_flushing_lwm    10
innodb_adaptive_hash_index  ON
innodb_adaptive_hash_index_parts    8
innodb_adaptive_max_sleep_delay 150000
innodb_api_bk_commit_interval   5
innodb_api_disable_rowlock  OFF
innodb_api_enable_binlog    OFF
innodb_api_enable_mdl   OFF
innodb_api_trx_level    0
innodb_autoextend_increment 64
innodb_autoinc_lock_mode    1
innodb_buffer_pool_chunk_size   8388608
innodb_buffer_pool_dump_at_shutdown ON
innodb_buffer_pool_dump_now OFF
innodb_buffer_pool_dump_pct 25
innodb_buffer_pool_filename ib_buffer_pool
innodb_buffer_pool_instances    1
innodb_buffer_pool_load_abort   OFF
innodb_buffer_pool_load_at_startup  ON
innodb_buffer_pool_load_now OFF
innodb_buffer_pool_size 8388608
innodb_change_buffer_max_size   25
innodb_change_buffering all
innodb_checksum_algorithm   crc32
innodb_checksums    ON
innodb_cmp_per_index_enabled    OFF
innodb_commit_concurrency   0
innodb_compression_failure_threshold_pct    5
innodb_compression_level    6
innodb_compression_pad_pct_max  50
innodb_concurrency_tickets  5000
innodb_data_file_path   ibdata1:12M:autoextend
innodb_data_home_dir    
innodb_deadlock_detect  ON
innodb_default_row_format   dynamic
innodb_disable_sort_file_cache  OFF
innodb_doublewrite  ON
innodb_fast_shutdown    1
innodb_file_format  Barracuda
innodb_file_format_check    ON
innodb_file_format_max  Barracuda
innodb_file_per_table   ON
innodb_fill_factor  100
innodb_flush_log_at_timeout 1
innodb_flush_log_at_trx_commit  1
innodb_flush_method 
innodb_flush_neighbors  1
innodb_flush_sync   ON
innodb_flushing_avg_loops   30
innodb_force_load_corrupted OFF
innodb_force_recovery   0
innodb_ft_aux_table 
innodb_ft_cache_size    8000000
innodb_ft_enable_diag_print OFF
innodb_ft_enable_stopword   ON
innodb_ft_max_token_size    84
innodb_ft_min_token_size    3
innodb_ft_num_word_optimize 2000
innodb_ft_result_cache_limit    2000000000
innodb_ft_server_stopword_table 
innodb_ft_sort_pll_degree   2
innodb_ft_total_cache_size  640000000
innodb_ft_user_stopword_table   
innodb_io_capacity  200
innodb_io_capacity_max  2000
innodb_large_prefix ON
innodb_lock_wait_timeout    50
innodb_locks_unsafe_for_binlog  OFF
innodb_log_buffer_size  1048576
innodb_log_checksums    ON
innodb_log_compressed_pages ON
innodb_log_file_size    50331648
innodb_log_files_in_group   2
innodb_log_group_home_dir   .\\
innodb_log_write_ahead_size 8192
innodb_lru_scan_depth   1024
innodb_max_dirty_pages_pct  75
innodb_max_dirty_pages_pct_lwm  0
innodb_max_purge_lag    0
innodb_max_purge_lag_delay  0
innodb_max_undo_log_size    1073741824
innodb_monitor_disable  
innodb_monitor_enable   
innodb_monitor_reset    
innodb_monitor_reset_all    
innodb_old_blocks_pct   37
innodb_old_blocks_time  1000
innodb_online_alter_log_max_size    134217728
innodb_open_files   300
innodb_optimize_fulltext_only   OFF
innodb_page_cleaners    1
innodb_page_size    16384
innodb_print_all_deadlocks  OFF
innodb_purge_batch_size 300
innodb_purge_rseg_truncate_frequency    128
innodb_purge_threads    4
innodb_random_read_ahead    OFF
innodb_read_ahead_threshold 56
innodb_read_io_threads  4
innodb_read_only    OFF
innodb_replication_delay    0
innodb_rollback_on_timeout  OFF
innodb_rollback_segments    128
innodb_sort_buffer_size 1048576
innodb_spin_wait_delay  6
innodb_stats_auto_recalc    ON
innodb_stats_include_delete_marked  OFF
innodb_stats_method nulls_equal
innodb_stats_on_metadata    OFF
innodb_stats_persistent ON
innodb_stats_persistent_sample_pages    20
innodb_stats_sample_pages   8
innodb_stats_transient_sample_pages 8
innodb_status_output    OFF
innodb_status_output_locks  OFF
innodb_strict_mode  OFF
innodb_support_xa   ON
innodb_sync_array_size  1
innodb_sync_spin_loops  30
innodb_table_locks  ON
innodb_temp_data_file_path  ibtmp1:12M:autoextend
innodb_thread_concurrency   9
innodb_thread_sleep_delay   0
innodb_tmpdir   
innodb_undo_directory   .\\
innodb_undo_log_truncate    OFF
innodb_undo_logs    128
innodb_undo_tablespaces 0
innodb_use_native_aio   ON
innodb_version  5.7.22
innodb_write_io_threads 4
insert_id   0
interactive_timeout 28800
internal_tmp_disk_storage_engine    InnoDB
join_buffer_size    262144
keep_files_on_create    OFF
key_buffer_size 8388608
key_cache_age_threshold 300
key_cache_block_size    1024
key_cache_division_limit    100
keyring_operations  ON
large_files_support ON
large_page_size 0
large_pages OFF
last_insert_id  0
lc_messages en_US
lc_messages_dir C:\\Program Files\\MySQL\\MySQL Server 5.7\\share\\
lc_time_names   en_US
license GPL
local_infile    ON
lock_wait_timeout   31536000
log_bin OFF
log_bin_basename    
log_bin_index   
log_bin_trust_function_creators OFF
log_bin_use_v1_row_events   OFF
log_builtin_as_identified_by_password   OFF
log_error   .\\DESKTOP-11VS9FN.err
log_error_verbosity 3
log_output  FILE
log_queries_not_using_indexes   OFF
log_slave_updates   OFF
log_slow_admin_statements   OFF
log_slow_slave_statements   OFF
log_statements_unsafe_for_binlog    ON
log_syslog  ON
log_syslog_tag  
log_throttle_queries_not_using_indexes  0
log_timestamps  UTC
log_warnings    2
long_query_time 10
low_priority_updates    OFF
lower_case_file_system  ON
lower_case_table_names  1
master_info_repository  FILE
master_verify_checksum  OFF
max_allowed_packet  173741056
max_binlog_cache_size   1.84467E+19
max_binlog_size 1073741824
max_binlog_stmt_cache_size  1.84467E+19
max_connect_errors  100
max_connections 151
max_delayed_threads 20
max_digest_length   1024
max_error_count 64
max_execution_time  0
max_heap_table_size 70254592
max_insert_delayed_threads  20
max_join_size   1.84467E+19
max_length_for_sort_data    1024
max_points_in_geometry  65536
max_prepared_stmt_count 16382
max_relay_log_size  0
max_seeks_for_key   4294967295
max_sort_length 1024
max_sp_recursion_depth  0
max_tmp_tables  32
max_user_connections    0
max_write_lock_count    4294967295
metadata_locks_cache_size   1024
metadata_locks_hash_instances   8
min_examined_row_limit  0
multi_range_count   256
myisam_data_pointer_size    6
myisam_max_sort_file_size   1.07374E+11
myisam_mmap_size    1.84467E+19
myisam_recover_options  OFF
myisam_repair_threads   1
myisam_sort_buffer_size 8388608
myisam_stats_method nulls_unequal
myisam_use_mmap OFF
mysql_native_password_proxy_users   OFF
named_pipe  OFF
net_buffer_length   16384
net_read_timeout    30
net_retry_count 10
net_write_timeout   60
new OFF
ngram_token_size    2
offline_mode    OFF
old OFF
old_alter_table OFF
old_passwords   0
open_files_limit    6209
optimizer_prune_level   1
optimizer_search_depth  62
optimizer_switch    "index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on,index_condition_pushdown=on,mrr=on,mrr_cost_based=on,block_nested_loop=on,batched_key_access=off,materialization=on,semijoin=on,loosescan=on,firstmatch=on,duplicateweedout=on,subquery_materialization_cost_based=on,use_index_extensions=on,condition_fanout_filter=on,derived_merge=on"
optimizer_trace "enabled=off,one_line=off"
optimizer_trace_features    "greedy_search=on,range_optimizer=on,dynamic_range=on,repeated_subselect=on"
optimizer_trace_limit   1
optimizer_trace_max_mem_size    16384
optimizer_trace_offset  -1
parser_max_mem_size 1.84467E+19
performance_schema  ON
performance_schema_accounts_size    -1
performance_schema_digests_size 10000
performance_schema_events_stages_history_long_size  10000
performance_schema_events_stages_history_size   10
performance_schema_events_statements_history_long_size  10000
performance_schema_events_statements_history_size   10
performance_schema_events_transactions_history_long_size    10000
performance_schema_events_transactions_history_size 10
performance_schema_events_waits_history_long_size   10000
performance_schema_events_waits_history_size    10
performance_schema_hosts_size   -1
performance_schema_max_cond_classes 80
performance_schema_max_cond_instances   -1
performance_schema_max_digest_length    1024
performance_schema_max_file_classes 80
performance_schema_max_file_handles 32768
performance_schema_max_file_instances   -1
performance_schema_max_index_stat   -1
performance_schema_max_memory_classes   320
performance_schema_max_metadata_locks   -1
performance_schema_max_mutex_classes    210
performance_schema_max_mutex_instances  -1
performance_schema_max_prepared_statements_instances    -1
performance_schema_max_program_instances    -1
performance_schema_max_rwlock_classes   40
performance_schema_max_rwlock_instances -1
performance_schema_max_socket_classes   10
performance_schema_max_socket_instances -1
performance_schema_max_sql_text_length  1024
performance_schema_max_stage_classes    150
performance_schema_max_statement_classes    193
performance_schema_max_statement_stack  10
performance_schema_max_table_handles    -1
performance_schema_max_table_instances  -1
performance_schema_max_table_lock_stat  -1
performance_schema_max_thread_classes   50
performance_schema_max_thread_instances -1
performance_schema_session_connect_attrs_size   512
performance_schema_setup_actors_size    -1
performance_schema_setup_objects_size   -1
performance_schema_users_size   -1
pid_file    C:\\ProgramData\\MySQL\\MySQL Server 5.7\\Data\\BLUEOA-LP005.pid
plugin_dir  C:\\Program Files\\MySQL\\MySQL Server 5.7\\lib\\plugin\\
port    3306
preload_buffer_size 32768
profiling   OFF
profiling_history_size  15
protocol_version    10
proxy_user  
pseudo_slave_mode   OFF
pseudo_thread_id    503
query_alloc_block_size  8192
query_cache_limit   1048576
query_cache_min_res_unit    4096
query_cache_size    1048576
query_cache_type    OFF
query_cache_wlock_invalidate    OFF
query_prealloc_size 8192
rand_seed1  0
rand_seed2  0
range_alloc_block_size  4096
range_optimizer_max_mem_size    8388608
rbr_exec_mode   STRICT
read_buffer_size    8192
read_only   OFF
read_rnd_buffer_size    1
relay_log   
relay_log_basename  C:\\ProgramData\\MySQL\\MySQL Server 5.7\\Data\\BLUEOA-LP005-relay-bin
relay_log_index C:\\ProgramData\\MySQL\\MySQL Server 5.7\\Data\\BLUEOA-LP005-relay-bin.index
relay_log_info_file relay-log.info
relay_log_info_repository   FILE
relay_log_purge ON
relay_log_recovery  OFF
relay_log_space_limit   0
report_host 
report_password 
report_port 3306
report_user 
require_secure_transport    OFF
rpl_stop_slave_timeout  31536000
secure_auth ON
secure_file_priv    C:\\ProgramData\\MySQL\\MySQL Server 5.7\\Uploads\\
server_id   1
server_id_bits  32
server_uuid 215d32a3-5340-11e8-93c8-106530971942
session_track_gtids OFF
session_track_schema    ON
session_track_state_change  OFF
session_track_system_variables  "time_zone,autocommit,character_set_client,character_set_results,character_set_connection"
session_track_transaction_info  OFF
sha256_password_proxy_users OFF
shared_memory   OFF
shared_memory_base_name MYSQL
show_compatibility_56   OFF
show_create_table_verbosity OFF
show_old_temporals  OFF
skip_external_locking   ON
skip_name_resolve   OFF
skip_networking OFF
skip_show_database  OFF
slave_allow_batching    OFF
slave_checkpoint_group  512
slave_checkpoint_period 300
slave_compressed_protocol   OFF
slave_exec_mode IDEMPOTENT
slave_load_tmpdir   C:\\WINDOWS\\SERVIC~3\\NETWOR~1\\AppData\\Local\\Temp
slave_max_allowed_packet    1073741824
slave_net_timeout   60
slave_parallel_type DATABASE
slave_parallel_workers  0
slave_pending_jobs_size_max 16777216
slave_preserve_commit_order OFF
slave_rows_search_algorithms    "TABLE_SCAN,INDEX_SCAN"
slave_skip_errors   OFF
slave_sql_verify_checksum   ON
slave_transaction_retries   10
slave_type_conversions  
slow_launch_time    2
slow_query_log  ON
slow_query_log_file DESKTOP-11VS9FN-slow.log
socket  MySQL
sort_buffer_size    262144
sql_auto_is_null    OFF
sql_big_selects ON
sql_buffer_result   OFF
sql_log_bin ON
sql_log_off OFF
sql_mode    
sql_notes   ON
sql_quote_show_create   ON
sql_safe_updates    OFF
sql_select_limit    1.84467E+19
sql_slave_skip_counter  0
sql_warnings    OFF
ssl_ca  
ssl_capath  
ssl_cert    
ssl_cipher  
ssl_crl 
ssl_crlpath 
ssl_key 
stored_program_cache    256
super_read_only OFF
sync_binlog 1
sync_frm    ON
sync_master_info    10000
sync_relay_log  10000
sync_relay_log_info 10000
system_time_zone    AUS Eastern Standard Time
table_definition_cache  1400
table_open_cache    2000
table_open_cache_instances  16
thread_cache_size   10
thread_handling one-thread-per-connection
thread_stack    262144
time_format %H:%i:%s
time_zone   SYSTEM
timestamp   1527639658
tls_version "TLSv1,TLSv1.1"
tmp_table_size  15728640
tmpdir  C:\\WINDOWS\\SERVIC~3\\NETWOR~1\\AppData\\Local\\Temp
transaction_alloc_block_size    8192
transaction_allow_batching  OFF
transaction_isolation   REPEATABLE-READ
transaction_prealloc_size   4096
transaction_read_only   OFF
transaction_write_set_extraction    OFF
tx_isolation    REPEATABLE-READ
tx_read_only    OFF
unique_checks   ON
updatable_views_with_limit  YES
version 5.7.22-log
version_comment MySQL Community Server (GPL)
version_compile_machine x86_64
version_compile_os  Win64
wait_timeout    28800
warning_count   0

*/EDIT 1 */我们决定放弃为 MySql 5.5 实现的只读优化，因为我们无法解决这个障碍。

Answer 1

我知道这是一个老问题，但我们最终找到了一个非常简单的解决方案。

解决方案很简单，即不在事务中执行存储过程调用。我们唯一需要额外注意的是确保所有受影响的存储过程都不会更改数据，但除此之外，解决方案就这么简单。