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MySQL 8.0参考手册:未发布特性与版本说明
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更新于2024-07-18
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"MySQL 8.0参考手册,涵盖了从8.0到8.0.14的版本,可能包括未发布的MySQL版本特性。MySQL 8.0目前不支持MySQL集群,有关MySQL集群的信息,请参阅MySQL NDB Cluster 7.5和7.6。"
MySQL是世界上最受欢迎的关系型数据库管理系统之一,其8.0版本带来了许多增强和新功能。本参考手册详细介绍了MySQL 8.0的各个方面,旨在为用户提供全面的操作和开发指导。
1. **版本覆盖范围**:
手册覆盖了MySQL 8.0系列的多个版本,从8.0到8.0.14,包括可能在正式发布之前的功能介绍。对于已发布的版本,用户可以参考MySQL 8.0的发行说明获取具体信息。
2. **MySQL 8.0的新特性**:
MySQL 8.0引入了许多新特性,如增强的性能、优化的安全性、改进的数据类型、新的SQL语法以及更强大的备份和恢复选项。这些特性旨在提升数据库的效率、可靠性和可维护性。
3. **不包含在所有版本中的特性**:
需要注意的是,并非手册中描述的所有特性都包含在每个MySQL 8.0的版本中。某些特性可能只存在于特定的授权版本中。用户应参考其MySQL 8.0许可协议或联系Oracle销售代表以确认所拥有的版本包含哪些功能。
4. **MySQL集群**:
MySQL 8.0目前不支持MySQL集群,如果需要关于集群的信息,用户应查阅MySQL NDB Cluster 7.5和7.6的文档。NDB Cluster提供了一种高可用性和可扩展性的解决方案,适合对数据一致性和实时访问有严格要求的应用场景。
5. **发行版变更记录**:
对于每个版本的具体变化,用户可以通过查看MySQL 8.0的发行说明来了解详细信息,这包括错误修复、性能改进和新特性介绍。
6. **法律信息和许可**:
用户在使用MySQL时,需遵守预言和法律通知中的条款,包括许可信息。这是确保合法使用和理解软件限制的关键部分。
7. **社区支持**:
在遇到问题时,用户可以通过MySQL论坛或邮件列表寻求帮助,与其他MySQL用户交流和讨论问题。
本参考手册是MySQL 8.0用户的宝贵资源,它提供了深入的技术细节,有助于管理员和开发者充分理解和利用MySQL 8.0的各项功能。无论是初学者还是经验丰富的专业人士,都可以从中获得必要的知识和指导。
MySQL 8.0 Reference Manual
xvi
15.16.1 InnoDB Monitor Types ................................................................................ 2612
15.16.2 Enabling InnoDB Monitors ........................................................................... 2612
15.16.3 InnoDB Standard Monitor and Lock Monitor Output ...................................... 2614
15.17 InnoDB Backup and Recovery ................................................................................ 2618
15.17.1 InnoDB Backup ........................................................................................... 2618
15.17.2 InnoDB Recovery ........................................................................................ 2619
15.18 InnoDB and MySQL Replication ............................................................................. 2622
15.19 InnoDB memcached Plugin .................................................................................... 2624
15.19.1 Benefits of the InnoDB memcached Plugin ................................................... 2624
15.19.2 InnoDB memcached Architecture ................................................................. 2625
15.19.3 Setting Up the InnoDB memcached Plugin ................................................... 2629
15.19.4 InnoDB memcached Multiple get and Range Query Support .......................... 2634
15.19.5 Security Considerations for the InnoDB memcached Plugin ........................... 2637
15.19.6 Writing Applications for the InnoDB memcached Plugin ................................. 2638
15.19.7 The InnoDB memcached Plugin and Replication ........................................... 2651
15.19.8 InnoDB memcached Plugin Internals ............................................................ 2654
15.19.9 Troubleshooting the InnoDB memcached Plugin ........................................... 2658
15.20 InnoDB Troubleshooting ......................................................................................... 2660
15.20.1 Troubleshooting InnoDB I/O Problems ......................................................... 2661
15.20.2 Forcing InnoDB Recovery ........................................................................... 2661
15.20.3 Troubleshooting InnoDB Data Dictionary Operations ..................................... 2663
15.20.4 InnoDB Error Handling ................................................................................ 2664
16 Alternative Storage Engines ................................................................................................ 2667
16.1 Setting the Storage Engine ...................................................................................... 2670
16.2 The MyISAM Storage Engine ................................................................................... 2671
16.2.1 MyISAM Startup Options ............................................................................... 2674
16.2.2 Space Needed for Keys ................................................................................ 2676
16.2.3 MyISAM Table Storage Formats .................................................................... 2676
16.2.4 MyISAM Table Problems ............................................................................... 2679
16.3 The MEMORY Storage Engine ................................................................................ 2680
16.4 The CSV Storage Engine ........................................................................................ 2685
16.4.1 Repairing and Checking CSV Tables ............................................................. 2685
16.4.2 CSV Limitations ............................................................................................ 2686
16.5 The ARCHIVE Storage Engine ................................................................................. 2686
16.6 The BLACKHOLE Storage Engine ........................................................................... 2688
16.7 The MERGE Storage Engine ................................................................................... 2690
16.7.1 MERGE Table Advantages and Disadvantages .............................................. 2693
16.7.2 MERGE Table Problems ............................................................................... 2693
16.8 The FEDERATED Storage Engine ........................................................................... 2695
16.8.1 FEDERATED Storage Engine Overview ......................................................... 2695
16.8.2 How to Create FEDERATED Tables .............................................................. 2696
16.8.3 FEDERATED Storage Engine Notes and Tips ................................................ 2699
16.8.4 FEDERATED Storage Engine Resources ....................................................... 2700
16.9 The EXAMPLE Storage Engine ................................................................................ 2700
16.10 Other Storage Engines .......................................................................................... 2701
16.11 Overview of MySQL Storage Engine Architecture .................................................... 2701
16.11.1 Pluggable Storage Engine Architecture ........................................................ 2702
16.11.2 The Common Database Server Layer .......................................................... 2702
17 Replication ......................................................................................................................... 2705
17.1 Configuring Replication ............................................................................................ 2706
17.1.1 Binary Log File Position Based Replication Configuration Overview ................. 2707
17.1.2 Setting Up Binary Log File Position Based Replication .................................... 2707
17.1.3 Replication with Global Transaction Identifiers ................................................ 2717
17.1.4 MySQL Multi-Source Replication ................................................................... 2731
17.1.5 Changing Replication Modes on Online Servers ............................................. 2735
17.1.6 Replication and Binary Logging Options and Variables .................................... 2740
17.1.7 Common Replication Administration Tasks ..................................................... 2830
17.2 Replication Implementation ...................................................................................... 2833
MySQL 8.0 Reference Manual
xvii
17.2.1 Replication Formats ...................................................................................... 2834
17.2.2 Replication Implementation Details ................................................................ 2841
17.2.3 Replication Channels .................................................................................... 2842
17.2.4 Replication Relay and Status Logs ................................................................ 2845
17.2.5 How Servers Evaluate Replication Filtering Rules ........................................... 2851
17.3 Replication Solutions ............................................................................................... 2858
17.3.1 Using Replication for Backups ....................................................................... 2858
17.3.2 Handling an Unexpected Halt of a Replication Slave ....................................... 2862
17.3.3 Monitoring Row-based Replication ................................................................. 2864
17.3.4 Using Replication with Different Master and Slave Storage Engines ................. 2864
17.3.5 Using Replication for Scale-Out ..................................................................... 2866
17.3.6 Replicating Different Databases to Different Slaves ........................................ 2867
17.3.7 Improving Replication Performance ................................................................ 2868
17.3.8 Switching Masters During Failover ................................................................. 2869
17.3.9 Setting Up Replication to Use Encrypted Connections .................................... 2871
17.3.10 Semisynchronous Replication ...................................................................... 2873
17.3.11 Delayed Replication .................................................................................... 2879
17.4 Replication Notes and Tips ...................................................................................... 2881
17.4.1 Replication Features and Issues .................................................................... 2881
17.4.2 Replication Compatibility Between MySQL Versions ....................................... 2907
17.4.3 Upgrading a Replication Setup ...................................................................... 2908
17.4.4 Troubleshooting Replication .......................................................................... 2909
17.4.5 How to Report Replication Bugs or Problems ................................................. 2910
18 Group Replication .............................................................................................................. 2913
18.1 Group Replication Background ................................................................................. 2914
18.1.1 Replication Technologies ............................................................................... 2914
18.1.2 Group Replication Use Cases ....................................................................... 2916
18.1.3 Group Replication Details .............................................................................. 2917
18.2 Getting Started ........................................................................................................ 2918
18.2.1 Deploying Group Replication in Single-Primary Mode ...................................... 2918
18.3 Monitoring Group Replication ................................................................................... 2929
18.3.1 Replication_group_member_stats .................................................................. 2929
18.3.2 Replication_group_members ......................................................................... 2930
18.3.3 Replication_connection_status ....................................................................... 2931
18.3.4 Replication_applier_status ............................................................................. 2931
18.3.5 Group Replication Server States .................................................................... 2932
18.4 Group Replication Operations .................................................................................. 2932
18.4.1 Deploying in Multi-Primary or Single-Primary Mode ......................................... 2933
18.4.2 Tuning Recovery .......................................................................................... 2935
18.4.3 Network Partitioning ...................................................................................... 2936
18.4.4 Using MySQL Enterprise Backup with Group Replication ................................ 2940
18.5 Group Replication Security ....................................................................................... 2942
18.5.1 IP Address Whitelisting ................................................................................. 2942
18.5.2 Secure Socket Layer Support (SSL) .............................................................. 2943
18.5.3 Virtual Private Networks (VPN) ...................................................................... 2947
18.6 Group Replication System Variables ......................................................................... 2947
18.7 Requirements and Limitations .................................................................................. 2965
18.7.1 Group Replication Requirements ................................................................... 2966
18.7.2 Group Replication Limitations ........................................................................ 2967
18.8 Frequently Asked Questions .................................................................................... 2968
18.9 Group Replication Technical Details ......................................................................... 2971
18.9.1 Group Replication Plugin Architecture ............................................................ 2971
18.9.2 The Group .................................................................................................... 2973
18.9.3 Data Manipulation Statements ....................................................................... 2973
18.9.4 Data Definition Statements ............................................................................ 2973
18.9.5 Distributed Recovery ..................................................................................... 2974
18.9.6 Observability ................................................................................................. 2980
18.9.7 Group Replication Performance ..................................................................... 2981
MySQL 8.0 Reference Manual
xviii
19 MySQL Shell ...................................................................................................................... 2985
20 Using MySQL as a Document Store ................................................................................... 2987
20.1 Key Concepts .......................................................................................................... 2988
20.2 Setting Up MySQL as a Document Store .................................................................. 2989
20.2.1 Installing MySQL Shell .................................................................................. 2989
20.2.2 Starting MySQL Shell .................................................................................... 2991
20.3 Quick-Start Guide: MySQL Shell for JavaScript ......................................................... 2992
20.3.1 Introduction ................................................................................................... 2992
20.3.2 Import Database Sample ............................................................................... 2993
20.3.3 MySQL Shell ................................................................................................ 2994
20.3.4 Documents and Collections ........................................................................... 2995
20.3.5 Relational Tables .......................................................................................... 3005
20.3.6 Documents in Tables .................................................................................... 3011
20.4 Quick-Start Guide: MySQL Shell for Python .............................................................. 3012
20.4.1 Introduction ................................................................................................... 3012
20.4.2 Import Database Sample ............................................................................... 3013
20.4.3 MySQL Shell ................................................................................................ 3014
20.4.4 Documents and Collections ........................................................................... 3015
20.4.5 Relational Tables .......................................................................................... 3025
20.4.6 Documents in Tables .................................................................................... 3031
20.5 X Plugin .................................................................................................................. 3032
20.5.1 Checking X Plugin Installation ....................................................................... 3032
20.5.2 Disabling X Plugin ........................................................................................ 3032
20.5.3 Using Secure Connections with X Plugin ....................................................... 3032
20.5.4 Using X Plugin with the Caching SHA-2 Authentication Plugin ......................... 3033
20.5.5 X Plugin Options and Variables ..................................................................... 3033
20.5.6 Monitoring X Plugin ...................................................................................... 3048
21 InnoDB Cluster ................................................................................................................... 3053
21.1 Introducing InnoDB Cluster ...................................................................................... 3053
21.2 Creating an InnoDB Cluster ..................................................................................... 3055
21.2.1 Deployment Scenarios .................................................................................. 3055
21.2.2 InnoDB Cluster Requirements ....................................................................... 3056
21.2.3 Methods of Installing ..................................................................................... 3056
21.2.4 Production Deployment of InnoDB Cluster ..................................................... 3057
21.2.5 Sandbox Deployment of InnoDB Cluster ........................................................ 3066
21.2.6 Adopting a Group Replication Deployment ..................................................... 3069
21.3 Using MySQL Router with InnoDB Cluster ................................................................ 3069
21.4 Working with InnoDB Cluster ................................................................................... 3073
21.5 Known Limitations ................................................................................................... 3085
22 Partitioning ......................................................................................................................... 3087
22.1 Overview of Partitioning in MySQL ........................................................................... 3088
22.2 Partitioning Types .................................................................................................... 3091
22.2.1 RANGE Partitioning ...................................................................................... 3093
22.2.2 LIST Partitioning ........................................................................................... 3097
22.2.3 COLUMNS Partitioning ................................................................................. 3099
22.2.4 HASH Partitioning ......................................................................................... 3106
22.2.5 KEY Partitioning ........................................................................................... 3109
22.2.6 Subpartitioning .............................................................................................. 3111
22.2.7 How MySQL Partitioning Handles NULL ........................................................ 3112
22.3 Partition Management .............................................................................................. 3117
22.3.1 Management of RANGE and LIST Partitions .................................................. 3118
22.3.2 Management of HASH and KEY Partitions ..................................................... 3124
22.3.3 Exchanging Partitions and Subpartitions with Tables ....................................... 3125
22.3.4 Maintenance of Partitions .............................................................................. 3132
22.3.5 Obtaining Information About Partitions ........................................................... 3134
22.4 Partition Pruning ...................................................................................................... 3136
22.5 Partition Selection .................................................................................................... 3139
22.6 Restrictions and Limitations on Partitioning ............................................................... 3144
MySQL 8.0 Reference Manual
xix
22.6.1 Partitioning Keys, Primary Keys, and Unique Keys ......................................... 3149
22.6.2 Partitioning Limitations Relating to Storage Engines ........................................ 3153
22.6.3 Partitioning Limitations Relating to Functions .................................................. 3153
23 Stored Programs and Views ............................................................................................... 3155
23.1 Defining Stored Programs ........................................................................................ 3156
23.2 Using Stored Routines (Procedures and Functions) ................................................... 3157
23.2.1 Stored Routine Syntax .................................................................................. 3157
23.2.2 Stored Routines and MySQL Privileges ......................................................... 3158
23.2.3 Stored Routine Metadata .............................................................................. 3158
23.2.4 Stored Procedures, Functions, Triggers, and LAST_INSERT_ID() .................... 3159
23.3 Using Triggers ......................................................................................................... 3159
23.3.1 Trigger Syntax and Examples ........................................................................ 3160
23.3.2 Trigger Metadata .......................................................................................... 3163
23.4 Using the Event Scheduler ...................................................................................... 3164
23.4.1 Event Scheduler Overview ............................................................................ 3164
23.4.2 Event Scheduler Configuration ...................................................................... 3165
23.4.3 Event Syntax ................................................................................................ 3167
23.4.4 Event Metadata ............................................................................................ 3167
23.4.5 Event Scheduler Status ................................................................................. 3168
23.4.6 The Event Scheduler and MySQL Privileges .................................................. 3169
23.5 Using Views ............................................................................................................ 3171
23.5.1 View Syntax ................................................................................................. 3172
23.5.2 View Processing Algorithms .......................................................................... 3172
23.5.3 Updatable and Insertable Views .................................................................... 3173
23.5.4 The View WITH CHECK OPTION Clause ...................................................... 3176
23.5.5 View Metadata .............................................................................................. 3177
23.6 Access Control for Stored Programs and Views ........................................................ 3177
23.7 Binary Logging of Stored Programs .......................................................................... 3178
24 INFORMATION_SCHEMA Tables ....................................................................................... 3185
24.1 Introduction ............................................................................................................. 3186
24.2 The INFORMATION_SCHEMA CHARACTER_SETS Table ....................................... 3189
24.3 The INFORMATION_SCHEMA COLLATIONS Table ................................................. 3190
24.4 The INFORMATION_SCHEMA COLLATION_CHARACTER_SET_APPLICABILITY
Table .............................................................................................................................. 3190
24.5 The INFORMATION_SCHEMA COLUMNS Table ..................................................... 3191
24.6 The INFORMATION_SCHEMA COLUMN_PRIVILEGES Table .................................. 3193
24.7 The INFORMATION_SCHEMA COLUMN_STATISTICS Table ................................... 3194
24.8 The INFORMATION_SCHEMA ENGINES Table ....................................................... 3195
24.9 The INFORMATION_SCHEMA EVENTS Table ......................................................... 3196
24.10 The INFORMATION_SCHEMA FILES Table ........................................................... 3199
24.11 The INFORMATION_SCHEMA KEY_COLUMN_USAGE Table ................................ 3202
24.12 The INFORMATION_SCHEMA KEYWORDS Table ................................................. 3204
24.13 The INFORMATION_SCHEMA OPTIMIZER_TRACE Table ..................................... 3204
24.14 The INFORMATION_SCHEMA PARAMETERS Table ............................................. 3205
24.15 The INFORMATION_SCHEMA PARTITIONS Table ................................................ 3206
24.16 The INFORMATION_SCHEMA PLUGINS Table ...................................................... 3209
24.17 The INFORMATION_SCHEMA PROCESSLIST Table ............................................. 3210
24.18 The INFORMATION_SCHEMA PROFILING Table .................................................. 3211
24.19 The INFORMATION_SCHEMA REFERENTIAL_CONSTRAINTS Table .................... 3213
24.20 The INFORMATION_SCHEMA RESOURCE_GROUPS Table ................................. 3213
24.21 The INFORMATION_SCHEMA ROUTINES Table ................................................... 3214
24.22 The INFORMATION_SCHEMA SCHEMATA Table .................................................. 3216
24.23 The INFORMATION_SCHEMA SCHEMA_PRIVILEGES Table ................................. 3217
24.24 The INFORMATION_SCHEMA STATISTICS Table ................................................. 3218
24.25 The INFORMATION_SCHEMA ST_GEOMETRY_COLUMNS Table ......................... 3220
24.26 The INFORMATION_SCHEMA ST_SPATIAL_REFERENCE_SYSTEMS Table ......... 3221
24.27 The INFORMATION_SCHEMA TABLES Table ....................................................... 3222
24.28 The INFORMATION_SCHEMA TABLESPACES Table ............................................ 3226
MySQL 8.0 Reference Manual
xx
24.29 The INFORMATION_SCHEMA TABLE_CONSTRAINTS Table ................................ 3227
24.30 The INFORMATION_SCHEMA TABLE_PRIVILEGES Table .................................... 3227
24.31 The INFORMATION_SCHEMA TRIGGERS Table ................................................... 3228
24.32 The INFORMATION_SCHEMA USER_PRIVILEGES Table ..................................... 3230
24.33 The INFORMATION_SCHEMA VIEWS Table ......................................................... 3230
24.34 The INFORMATION_SCHEMA VIEW_ROUTINE_USAGE Table .............................. 3232
24.35 The INFORMATION_SCHEMA VIEW_TABLE_USAGE Table .................................. 3232
24.36 INFORMATION_SCHEMA InnoDB Tables .............................................................. 3233
24.36.1 The INFORMATION_SCHEMA INNODB_BUFFER_PAGE Table ................... 3233
24.36.2 The INFORMATION_SCHEMA INNODB_BUFFER_PAGE_LRU Table .......... 3237
24.36.3 The INFORMATION_SCHEMA INNODB_BUFFER_POOL_STATS Table ...... 3240
24.36.4 The INFORMATION_SCHEMA INNODB_CACHED_INDEXES Table ............. 3243
24.36.5 The INFORMATION_SCHEMA INNODB_CMP and INNODB_CMP_RESET
Tables ..................................................................................................................... 3244
24.36.6 The INFORMATION_SCHEMA INNODB_CMPMEM and
INNODB_CMPMEM_RESET Tables ........................................................................ 3245
24.36.7 The INFORMATION_SCHEMA INNODB_CMP_PER_INDEX and
INNODB_CMP_PER_INDEX_RESET Tables ........................................................... 3247
24.36.8 The INFORMATION_SCHEMA INNODB_COLUMNS Table .......................... 3248
24.36.9 The INFORMATION_SCHEMA INNODB_DATAFILES Table ......................... 3250
24.36.10 The INFORMATION_SCHEMA INNODB_FIELDS Table ............................. 3250
24.36.11 The INFORMATION_SCHEMA INNODB_FOREIGN Table .......................... 3251
24.36.12 The INFORMATION_SCHEMA INNODB_FOREIGN_COLS Table ............... 3252
24.36.13 The INFORMATION_SCHEMA INNODB_FT_BEING_DELETED Table ........ 3252
24.36.14 The INFORMATION_SCHEMA INNODB_FT_CONFIG Table ...................... 3253
24.36.15 The INFORMATION_SCHEMA INNODB_FT_DEFAULT_STOPWORD Table 3254
24.36.16 The INFORMATION_SCHEMA INNODB_FT_DELETED Table .................... 3255
24.36.17 The INFORMATION_SCHEMA INNODB_FT_INDEX_CACHE Table ............ 3256
24.36.18 The INFORMATION_SCHEMA INNODB_FT_INDEX_TABLE Table ............. 3257
24.36.19 The INFORMATION_SCHEMA INNODB_INDEXES Table .......................... 3259
24.36.20 The INFORMATION_SCHEMA INNODB_LOCKS Table .............................. 3260
24.36.21 The INFORMATION_SCHEMA INNODB_LOCK_WAITS Table .................... 3261
24.36.22 The INFORMATION_SCHEMA INNODB_METRICS Table .......................... 3262
24.36.23 The INFORMATION_SCHEMA INNODB_SESSION_TEMP_TABLESPACES
Table ...................................................................................................................... 3263
24.36.24 The INFORMATION_SCHEMA INNODB_TABLES Table ............................ 3264
24.36.25 The INFORMATION_SCHEMA INNODB_TABLESPACES Table ................. 3267
24.36.26 The INFORMATION_SCHEMA INNODB_TABLESPACES_BRIEF Table ...... 3271
24.36.27 The INFORMATION_SCHEMA INNODB_TABLESTATS View ..................... 3271
24.36.28 The INFORMATION_SCHEMA INNODB_TEMP_TABLE_INFO Table .......... 3273
24.36.29 The INFORMATION_SCHEMA INNODB_TRX Table .................................. 3274
24.36.30 The INFORMATION_SCHEMA INNODB_VIRTUAL Table ........................... 3276
24.37 INFORMATION_SCHEMA Thread Pool Tables ....................................................... 3277
24.37.1 The INFORMATION_SCHEMA TP_THREAD_GROUP_STATE Table ............ 3278
24.37.2 The INFORMATION_SCHEMA TP_THREAD_GROUP_STATS Table ............ 3278
24.37.3 The INFORMATION_SCHEMA TP_THREAD_STATE Table ......................... 3279
24.38 INFORMATION_SCHEMA Connection-Control Tables ............................................. 3279
24.38.1 The INFORMATION_SCHEMA
CONNECTION_CONTROL_FAILED_LOGIN_ATTEMPTS Table ............................... 3279
24.39 Extensions to SHOW Statements ........................................................................... 3280
25 MySQL Performance Schema ............................................................................................. 3283
25.1 Performance Schema Quick Start ............................................................................ 3285
25.2 Performance Schema Build Configuration ................................................................. 3291
25.3 Performance Schema Startup Configuration .............................................................. 3291
25.4 Performance Schema Runtime Configuration ............................................................ 3293
25.4.1 Performance Schema Event Timing ............................................................... 3294
25.4.2 Performance Schema Event Filtering ............................................................. 3296
25.4.3 Event Pre-Filtering ........................................................................................ 3298
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