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深入探索:MySQL 8.0 英文原版参考手册
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"MySQL 8.0 Reference Manual 是一本详尽的官方参考手册,涵盖了 MySQL 8.0 版本从 8.0.0 到 8.0.4 的所有内容。"
MySQL 8.0 是 MySQL 数据库管理系统的一个重要版本,它在功能和性能上都有显著的改进。尽管标记为开发系列,不推荐用于生产环境,但这个版本引入了一系列创新特性,旨在提升数据库的效率、安全性和可扩展性。
1. **增强的InnoDB存储引擎**:
MySQL 8.0 在 InnoDB 存储引擎方面进行了优化,包括更快的事务处理、更强大的行锁定机制以及对大表的更好支持。此外,新的 InnoDB Cluster 功能提供了更高级别的高可用性和容错性。
2. **窗口函数**:
MySQL 8.0 引入了 SQL 标准的窗口函数,这使得在聚合查询中进行复杂的分析和排序变得更加容易,无需创建子查询或自连接。
3. **JSON支持**:
对 JSON 数据类型的支持增强,允许存储和查询半结构化数据,适应 NoSQL 风格的数据操作,提高了灵活性。
4. **动态列**:
新增的动态列功能允许在一个列中存储多种类型的数据,这在处理元数据或多种数据格式时非常有用。
5. **改进的分区功能**:
分区功能在 8.0 版本中得到了扩展,允许更灵活的分区策略,提高了大数据处理的效率。
6. **更好的安全性和权限管理**:
MySQL 8.0 引入了认证插件的改进,如 caching_sha2_password,增强了安全性。同时,权限系统也进行了重构,提供了更精细的访问控制。
7. **优化的复制功能**:
复制功能得到增强,包括支持 GTIDs(全局事务标识符)的无冲突复制,以及 binlog 格式的改进,提升了复制的可靠性和性能。
8. **原子DDL**:
在 8.0 版本中,数据定义语言(DDL)操作变为原子性的,这意味着即使在DDL操作过程中发生故障,数据库也能保持一致性。
9. **性能提升**:
MySQL 8.0 引入了多项性能优化,如并行查询执行、更好的查询缓存和索引统计,以及内存管理和线程池的改进。
10. **MySQL Shell**:
MySQL Shell 是一个交互式工具,提供 JavaScript 和 Python 的支持,简化了数据库管理、脚本编写和自动化任务。
对于开发者来说,阅读 MySQL 8.0 Reference Manual 不仅能了解这些新特性和功能,还能提升对 SQL 标准的理解,提高数据库设计和管理的技能。尽管手册是英文版,但通过阅读可以同时锻炼英语阅读能力。若遇到问题,可以访问 MySQL 论坛或邮件列表,与其他用户交流讨论。此外,官方还提供了多种格式的文档下载,包括 HTML 和 PDF,方便不同需求的用户查阅。
MySQL 8.0 Reference Manual
Pre-General
Availability
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Pre-General
Availability
Draft
16.11.2 The Common Database Server Layer .......................................................... 2392
17 High Availability and Scalability ........................................................................................... 2395
17.1 Using ZFS Replication ............................................................................................. 2397
17.1.1 Using ZFS for File System Replication ........................................................... 2398
17.1.2 Configuring MySQL for ZFS Replication ......................................................... 2399
17.1.3 Handling MySQL Recovery with ZFS ............................................................. 2400
17.2 Using MySQL with memcached ................................................................................ 2400
17.2.1 Installing memcached .................................................................................... 2401
17.2.2 Using memcached ........................................................................................ 2403
17.2.3 Developing a memcached Application ............................................................ 2421
17.2.4 Getting memcached Statistics ........................................................................ 2446
17.2.5 memcached FAQ .......................................................................................... 2454
18 Replication ......................................................................................................................... 2459
18.1 Configuring Replication ............................................................................................ 2460
18.1.1 Binary Log File Position Based Replication Configuration Overview ................. 2461
18.1.2 Setting Up Binary Log File Position Based Replication .................................... 2461
18.1.3 Replication with Global Transaction Identifiers ................................................ 2470
18.1.4 MySQL Multi-Source Replication ................................................................... 2480
18.1.5 Changing Replication Modes on Online Servers ............................................. 2484
18.1.6 Replication and Binary Logging Options and Variables .................................... 2490
18.1.7 Common Replication Administration Tasks ..................................................... 2578
18.2 Replication Implementation ...................................................................................... 2580
18.2.1 Replication Formats ...................................................................................... 2581
18.2.2 Replication Implementation Details ................................................................ 2588
18.2.3 Replication Channels .................................................................................... 2589
18.2.4 Replication Relay and Status Logs ................................................................ 2593
18.2.5 How Servers Evaluate Replication Filtering Rules ........................................... 2598
18.3 Replication Solutions ............................................................................................... 2607
18.3.1 Using Replication for Backups ....................................................................... 2608
18.3.2 Handling an Unexpected Halt of a Replication Slave ....................................... 2611
18.3.3 Monitoring Row-based Replication ................................................................. 2613
18.3.4 Using Replication with Different Master and Slave Storage Engines ................. 2614
18.3.5 Using Replication for Scale-Out ..................................................................... 2615
18.3.6 Replicating Different Databases to Different Slaves ........................................ 2616
18.3.7 Improving Replication Performance ................................................................ 2617
18.3.8 Switching Masters During Failover ................................................................. 2618
18.3.9 Setting Up Replication to Use Encrypted Connections .................................... 2620
18.3.10 Semisynchronous Replication ...................................................................... 2622
18.3.11 Delayed Replication .................................................................................... 2627
18.4 Replication Notes and Tips ...................................................................................... 2629
18.4.1 Replication Features and Issues .................................................................... 2629
18.4.2 Replication Compatibility Between MySQL Versions ....................................... 2655
18.4.3 Upgrading a Replication Setup ...................................................................... 2656
18.4.4 Troubleshooting Replication .......................................................................... 2657
18.4.5 How to Report Replication Bugs or Problems ................................................. 2658
19 MySQL Shell User Guide ................................................................................................... 2661
19.1 MySQL Shell Features ............................................................................................. 2661
19.2 Getting Started with MySQL Shell ............................................................................ 2663
19.2.1 MySQL Shell Connections ............................................................................. 2663
19.2.2 MySQL Shell Sessions .................................................................................. 2668
19.2.3 MySQL Shell Global Variables ...................................................................... 2669
19.2.4 MySQL Shell Code History ............................................................................ 2671
19.3 MySQL Shell Code Execution .................................................................................. 2671
19.3.1 Interactive Code Execution ............................................................................ 2672
19.3.2 Batch Code Execution .................................................................................. 2673
19.3.3 Output Formats ............................................................................................ 2673
19.3.4 Active Language ........................................................................................... 2676
19.3.5 Batch Mode Made Interactive ........................................................................ 2676
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19.4 Configuring MySQL Shell ......................................................................................... 2677
19.4.1 MySQL Shell Commands .............................................................................. 2677
19.5 MySQL Shell Application Log ................................................................................... 2679
19.5.1 Application Log ............................................................................................. 2679
19.6 Customizing MySQL Shell ....................................................................................... 2680
19.6.1 Working With Start-Up Scripts ....................................................................... 2681
19.6.2 Adding Module Search Paths ........................................................................ 2681
19.6.3 Customizing the Prompt ................................................................................ 2682
20 Using MySQL as a Document Store ................................................................................... 2683
20.1 Preproduction Status — Legal Notice ....................................................................... 2684
20.2 Key Concepts .......................................................................................................... 2684
20.3 Setting Up MySQL as a Document Store .................................................................. 2685
20.3.1 Installing MySQL Shell .................................................................................. 2687
20.3.2 Starting MySQL Shell .................................................................................... 2691
20.4 Quick-Start Guide: MySQL Shell for JavaScript ......................................................... 2691
20.4.1 Introduction ................................................................................................... 2692
20.4.2 Import Database Sample ............................................................................... 2693
20.4.3 MySQL Shell ................................................................................................ 2693
20.4.4 Documents and Collections ........................................................................... 2695
20.4.5 Relational Tables .......................................................................................... 2705
20.4.6 Documents in Tables .................................................................................... 2710
20.5 Quick-Start Guide: MySQL Shell for Python .............................................................. 2711
20.5.1 Introduction ................................................................................................... 2712
20.5.2 Import Database Sample ............................................................................... 2712
20.5.3 MySQL Shell ................................................................................................ 2713
20.5.4 Documents and Collections ........................................................................... 2715
20.5.5 Relational Tables .......................................................................................... 2724
20.5.6 Documents in Tables .................................................................................... 2730
20.6 Quick-Start Guide: MySQL for Visual Studio ............................................................. 2731
20.7 X Plugin .................................................................................................................. 2732
20.7.1 Using Secure Connections with X Plugin ....................................................... 2733
20.7.2 X Plugin Options and Variables ..................................................................... 2733
20.7.3 Monitoring X Plugin ...................................................................................... 2739
21 Group Replication .............................................................................................................. 2743
21.1 Group Replication Background ................................................................................. 2744
21.1.1 Replication Technologies ............................................................................... 2744
21.1.2 Group Replication Use Cases ....................................................................... 2746
21.1.3 Group Replication Details .............................................................................. 2747
21.2 Getting Started ........................................................................................................ 2748
21.2.1 Deploying Group Replication in Single-Primary Mode ...................................... 2748
21.3 Monitoring Group Replication ................................................................................... 2758
21.3.1 Replication_group_member_stats .................................................................. 2758
21.3.2 Replication_group_members ......................................................................... 2759
21.3.3 Replication_connection_status ....................................................................... 2760
21.3.4 Replication_applier_status ............................................................................. 2760
21.3.5 Group Replication Server States .................................................................... 2761
21.4 Group Replication Operations .................................................................................. 2761
21.4.1 Deploying in Multi-Primary or Single-Primary Mode ......................................... 2762
21.4.2 Tuning Recovery .......................................................................................... 2763
21.4.3 Network Partitioning ...................................................................................... 2765
21.4.4 Using MySQL Enterprise Backup with Group Replication ................................ 2770
21.5 Group Replication Security ....................................................................................... 2771
21.5.1 IP Address Whitelisting ................................................................................. 2771
21.5.2 Secure Socket Layer Support (SSL) .............................................................. 2772
21.5.3 Virtual Private Networks (VPN) ...................................................................... 2774
21.6 Group Replication System Variables ......................................................................... 2774
21.7 Requirements and Limitations .................................................................................. 2789
21.7.1 Group Replication Requirements ................................................................... 2789
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21.7.2 Group Replication Limitations ........................................................................ 2791
21.8 Frequently Asked Questions .................................................................................... 2792
21.9 Group Replication Technical Details ......................................................................... 2794
21.9.1 Group Replication Plugin Architecture ............................................................ 2794
21.9.2 The Group .................................................................................................... 2796
21.9.3 Data Manipulation Statements ....................................................................... 2796
21.9.4 Data Definition Statements ............................................................................ 2796
21.9.5 Distributed Recovery ..................................................................................... 2797
21.9.6 Observability ................................................................................................. 2803
21.9.7 Group Replication Performance ..................................................................... 2804
22 InnoDB Cluster ................................................................................................................... 2809
22.1 Introducing InnoDB Cluster ...................................................................................... 2809
22.2 Creating an InnoDB Cluster ..................................................................................... 2811
22.3 Sandbox Deployment of InnoDB Cluster ................................................................... 2812
22.4 Production Deployment of InnoDB Cluster ................................................................ 2815
22.5 Using MySQL Router with InnoDB Cluster ................................................................ 2822
22.6 Working with InnoDB Cluster ................................................................................... 2824
22.7 Known Limitations ................................................................................................... 2833
23 Partitioning ......................................................................................................................... 2835
23.1 Overview of Partitioning in MySQL ........................................................................... 2836
23.2 Partitioning Types .................................................................................................... 2839
23.2.1 RANGE Partitioning ...................................................................................... 2841
23.2.2 LIST Partitioning ........................................................................................... 2845
23.2.3 COLUMNS Partitioning ................................................................................. 2847
23.2.4 HASH Partitioning ......................................................................................... 2854
23.2.5 KEY Partitioning ........................................................................................... 2857
23.2.6 Subpartitioning .............................................................................................. 2859
23.2.7 How MySQL Partitioning Handles NULL ........................................................ 2860
23.3 Partition Management .............................................................................................. 2865
23.3.1 Management of RANGE and LIST Partitions .................................................. 2866
23.3.2 Management of HASH and KEY Partitions ..................................................... 2872
23.3.3 Exchanging Partitions and Subpartitions with Tables ....................................... 2873
23.3.4 Maintenance of Partitions .............................................................................. 2880
23.3.5 Obtaining Information About Partitions ........................................................... 2882
23.4 Partition Pruning ...................................................................................................... 2884
23.5 Partition Selection .................................................................................................... 2887
23.6 Restrictions and Limitations on Partitioning ............................................................... 2892
23.6.1 Partitioning Keys, Primary Keys, and Unique Keys ......................................... 2897
23.6.2 Partitioning Limitations Relating to Storage Engines ........................................ 2901
23.6.3 Partitioning Limitations Relating to Functions .................................................. 2901
24 Stored Programs and Views ............................................................................................... 2903
24.1 Defining Stored Programs ........................................................................................ 2904
24.2 Using Stored Routines (Procedures and Functions) ................................................... 2905
24.2.1 Stored Routine Syntax .................................................................................. 2905
24.2.2 Stored Routines and MySQL Privileges ......................................................... 2906
24.2.3 Stored Routine Metadata .............................................................................. 2906
24.2.4 Stored Procedures, Functions, Triggers, and LAST_INSERT_ID() .................... 2907
24.3 Using Triggers ......................................................................................................... 2907
24.3.1 Trigger Syntax and Examples ........................................................................ 2908
24.3.2 Trigger Metadata .......................................................................................... 2912
24.4 Using the Event Scheduler ...................................................................................... 2912
24.4.1 Event Scheduler Overview ............................................................................ 2912
24.4.2 Event Scheduler Configuration ...................................................................... 2913
24.4.3 Event Syntax ................................................................................................ 2915
24.4.4 Event Metadata ............................................................................................ 2915
24.4.5 Event Scheduler Status ................................................................................. 2916
24.4.6 The Event Scheduler and MySQL Privileges .................................................. 2917
24.5 Using Views ............................................................................................................ 2920
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24.5.1 View Syntax ................................................................................................. 2920
24.5.2 View Processing Algorithms .......................................................................... 2920
24.5.3 Updatable and Insertable Views .................................................................... 2922
24.5.4 The View WITH CHECK OPTION Clause ...................................................... 2924
24.5.5 View Metadata .............................................................................................. 2925
24.6 Access Control for Stored Programs and Views ........................................................ 2925
24.7 Binary Logging of Stored Programs .......................................................................... 2927
25 INFORMATION_SCHEMA Tables ....................................................................................... 2933
25.1 The INFORMATION_SCHEMA CHARACTER_SETS Table ....................................... 2936
25.2 The INFORMATION_SCHEMA COLLATIONS Table ................................................. 2937
25.3 The INFORMATION_SCHEMA COLLATION_CHARACTER_SET_APPLICABILITY
Table .............................................................................................................................. 2937
25.4 The INFORMATION_SCHEMA COLUMNS Table ..................................................... 2937
25.5 The INFORMATION_SCHEMA COLUMN_PRIVILEGES Table .................................. 2939
25.6 The INFORMATION_SCHEMA COLUMN_STATISTICS Table ................................... 2939
25.7 The INFORMATION_SCHEMA ENGINES Table ....................................................... 2940
25.8 The INFORMATION_SCHEMA EVENTS Table ......................................................... 2940
25.9 The INFORMATION_SCHEMA FILES Table ............................................................. 2943
25.10 The INFORMATION_SCHEMA KEY_COLUMN_USAGE Table ................................ 2946
25.11 The INFORMATION_SCHEMA OPTIMIZER_TRACE Table ..................................... 2947
25.12 The INFORMATION_SCHEMA PARAMETERS Table ............................................. 2947
25.13 The INFORMATION_SCHEMA PARTITIONS Table ................................................ 2947
25.14 The INFORMATION_SCHEMA PLUGINS Table ...................................................... 2950
25.15 The INFORMATION_SCHEMA PROCESSLIST Table ............................................. 2951
25.16 The INFORMATION_SCHEMA PROFILING Table .................................................. 2952
25.17 The INFORMATION_SCHEMA REFERENTIAL_CONSTRAINTS Table .................... 2953
25.18 The INFORMATION_SCHEMA RESOURCE_GROUPS Table ................................. 2954
25.19 The INFORMATION_SCHEMA ROUTINES Table ................................................... 2954
25.20 The INFORMATION_SCHEMA SCHEMATA Table .................................................. 2955
25.21 The INFORMATION_SCHEMA SCHEMA_PRIVILEGES Table ................................. 2956
25.22 The INFORMATION_SCHEMA STATISTICS Table ................................................. 2956
25.23 The INFORMATION_SCHEMA ST_GEOMETRY_COLUMNS Table ......................... 2957
25.24 The INFORMATION_SCHEMA ST_SPATIAL_REFERENCE_SYSTEMS Table ......... 2958
25.25 The INFORMATION_SCHEMA TABLES Table ....................................................... 2959
25.26 The INFORMATION_SCHEMA TABLESPACES Table ............................................ 2961
25.27 The INFORMATION_SCHEMA TABLE_CONSTRAINTS Table ................................ 2961
25.28 The INFORMATION_SCHEMA TABLE_PRIVILEGES Table .................................... 2962
25.29 The INFORMATION_SCHEMA TRIGGERS Table ................................................... 2962
25.30 The INFORMATION_SCHEMA USER_PRIVILEGES Table ..................................... 2964
25.31 The INFORMATION_SCHEMA VIEWS Table ......................................................... 2964
25.32 InnoDB INFORMATION_SCHEMA Tables .............................................................. 2966
25.32.1 The INFORMATION_SCHEMA INNODB_BUFFER_PAGE Table ................... 2966
25.32.2 The INFORMATION_SCHEMA INNODB_BUFFER_PAGE_LRU Table .......... 2968
25.32.3 The INFORMATION_SCHEMA INNODB_BUFFER_POOL_STATS Table ...... 2970
25.32.4 The INFORMATION_SCHEMA INNODB_CACHED_INDEXES Table ............. 2972
25.32.5 The INFORMATION_SCHEMA INNODB_CMP and INNODB_CMP_RESET
Tables ..................................................................................................................... 2972
25.32.6 The INFORMATION_SCHEMA INNODB_CMPMEM and
INNODB_CMPMEM_RESET Tables ........................................................................ 2974
25.32.7 The INFORMATION_SCHEMA INNODB_CMP_PER_INDEX and
INNODB_CMP_PER_INDEX_RESET Tables ........................................................... 2975
25.32.8 The INFORMATION_SCHEMA INNODB_FT_BEING_DELETED Table .......... 2976
25.32.9 The INFORMATION_SCHEMA INNODB_FT_CONFIG Table ........................ 2977
25.32.10 The INFORMATION_SCHEMA INNODB_FT_DEFAULT_STOPWORD Table 2978
25.32.11 The INFORMATION_SCHEMA INNODB_FT_DELETED Table .................... 2979
25.32.12 The INFORMATION_SCHEMA INNODB_FT_INDEX_CACHE Table ............ 2980
25.32.13 The INFORMATION_SCHEMA INNODB_FT_INDEX_TABLE Table ............. 2981
25.32.14 The INFORMATION_SCHEMA INNODB_LOCKS Table .............................. 2982
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25.32.15 The INFORMATION_SCHEMA INNODB_LOCK_WAITS Table .................... 2983
25.32.16 The INFORMATION_SCHEMA INNODB_METRICS Table .......................... 2984
25.32.17 The INFORMATION_SCHEMA INNODB_COLUMNS Table ........................ 2985
25.32.18 The INFORMATION_SCHEMA INNODB_DATAFILES Table ....................... 2986
25.32.19 The INFORMATION_SCHEMA INNODB_FIELDS Table ............................. 2987
25.32.20 The INFORMATION_SCHEMA INNODB_FOREIGN Table .......................... 2987
25.32.21 The INFORMATION_SCHEMA INNODB_FOREIGN_COLS Table ............... 2988
25.32.22 The INFORMATION_SCHEMA INNODB_INDEXES Table .......................... 2988
25.32.23 The INFORMATION_SCHEMA INNODB_TABLES Table ............................ 2990
25.32.24 The INFORMATION_SCHEMA INNODB_TABLESPACES Table ................. 2992
25.32.25 The INFORMATION_SCHEMA INNODB_TABLESPACES_BRIEF Table ...... 2995
25.32.26 The INFORMATION_SCHEMA INNODB_TABLESTATS View ..................... 2996
25.32.27 The INFORMATION_SCHEMA INNODB_VIRTUAL Table ........................... 2997
25.32.28 The INFORMATION_SCHEMA INNODB_TEMP_TABLE_INFO Table .......... 2998
25.32.29 The INFORMATION_SCHEMA INNODB_TRX Table .................................. 2999
25.33 Connection-Control INFORMATION_SCHEMA Tables ............................................. 3001
25.33.1 The INFORMATION_SCHEMA
CONNECTION_CONTROL_FAILED_LOGIN_ATTEMPTS Table ............................... 3001
25.34 Extensions to SHOW Statements ........................................................................... 3001
26 MySQL Performance Schema ............................................................................................. 3005
26.1 Performance Schema Quick Start ............................................................................ 3007
26.2 Performance Schema Build Configuration ................................................................. 3013
26.3 Performance Schema Startup Configuration .............................................................. 3013
26.4 Performance Schema Runtime Configuration ............................................................ 3015
26.4.1 Performance Schema Event Timing ............................................................... 3016
26.4.2 Performance Schema Event Filtering ............................................................. 3018
26.4.3 Event Pre-Filtering ........................................................................................ 3020
26.4.4 Pre-Filtering by Instrument ............................................................................ 3020
26.4.5 Pre-Filtering by Object .................................................................................. 3022
26.4.6 Pre-Filtering by Thread ................................................................................. 3024
26.4.7 Pre-Filtering by Consumer ............................................................................. 3026
26.4.8 Example Consumer Configurations ................................................................ 3028
26.4.9 Naming Instruments or Consumers for Filtering Operations ............................. 3033
26.4.10 Determining What Is Instrumented ............................................................... 3034
26.5 Performance Schema Queries ................................................................................. 3034
26.6 Performance Schema Instrument Naming Conventions .............................................. 3035
26.7 Performance Schema Status Monitoring ................................................................... 3038
26.8 Performance Schema Atom and Molecule Events ..................................................... 3041
26.9 Performance Schema Statement Digests and Sampling ............................................ 3042
26.10 Performance Schema General Table Characteristics ............................................... 3046
26.11 Performance Schema Table Descriptions ................................................................ 3047
26.11.1 Performance Schema Table Index ............................................................... 3048
26.11.2 Performance Schema Setup Tables ............................................................. 3050
26.11.3 Performance Schema Instance Tables ......................................................... 3058
26.11.4 Performance Schema Wait Event Tables ..................................................... 3063
26.11.5 Performance Schema Stage Event Tables ................................................... 3068
26.11.6 Performance Schema Statement Event Tables ............................................. 3073
26.11.7 Performance Schema Transaction Tables .................................................... 3083
26.11.8 Performance Schema Connection Tables ..................................................... 3089
26.11.9 Performance Schema Connection Attribute Tables ....................................... 3093
26.11.10 Performance Schema User Variable Tables ............................................... 3096
26.11.11 Performance Schema Replication Tables ................................................... 3096
26.11.12 Performance Schema Lock Tables ............................................................. 3111
26.11.13 Performance Schema System Variable Tables ........................................... 3118
26.11.14 Performance Schema Status Variable Tables ............................................. 3122
26.11.15 Performance Schema Summary Tables ..................................................... 3124
26.11.16 Performance Schema Miscellaneous Tables ............................................... 3151
26.12 Performance Schema Option and Variable Reference ............................................. 3160
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