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首页MySQL 8.0 参考手册:特性详解与NDB集群包括
MySQL 8.0 参考手册:特性详解与NDB集群包括
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更新于2024-01-20
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本文是关于MySQL 8.0参考手册的总结。MySQL 8.0参考手册是关于MySQL 8.0版本的,以及基于NDB版本8.0的NDB集群发布的8.0.29版和8.0.28-ndb-8.0.28版。手册中还可能包含尚未发布的MySQL版本的功能文档。该手册不仅提供了MySQL 8.0版本的详细说明,还涵盖了NDB集群的版本说明。
MySQL 8.0是一种功能强大的关系型数据库管理系统,具有许多令人兴奋的新功能。这个版本的手册说明了这些新功能以及如何使用它们。
首先,MySQL 8.0引入了更好的性能和扩展性。它通过改进查询执行计划、优化查询优化器和引入更高效的索引数据结构来提高查询性能。此外,MySQL 8.0还引入了多线程复制和并行复制,提高了复制性能。这些改进使得MySQL 8.0能够处理更大规模的工作负载。
其次,MySQL 8.0还引入了更强大的安全功能。它提供了更加严格的权限管理,可以以更细粒度的方式控制用户对数据库的访问权限。此外,MySQL 8.0还引入了加密连接和数据加密功能,保护数据库中的敏感数据免受未经授权的访问。
MySQL 8.0还引入了更好的JSON支持。它提供了一组全新的JSON函数,可以在数据库中存储和处理JSON数据类型。此外,MySQL 8.0还引入了针对JSON数据的索引支持,提高了查询性能。
此外,MySQL 8.0还引入了许多其他功能,如保存点和闪回,提供了更好的事务管理和灾难恢复能力;强化的InnoDB存储引擎,提供更好的并发性和可靠性;自适应哈希索引,提高了大数据量下的查询性能;增强的在线DDL功能,允许在不中断服务的情况下修改表结构等等。
总之,MySQL 8.0是一个强大且功能丰富的数据库管理系统,它提供了更好的性能、更强大的安全性和更好的功能支持。通过阅读MySQL 8.0参考手册,用户可以全面了解MySQL 8.0的各种功能和用法,从而更好地应用和管理MySQL数据库。
MySQL 8.0 Reference Manual
15.9 InnoDB Table and Page Compression ...................................................................... 3051
15.9.1 InnoDB Table Compression ........................................................................... 3051
15.9.2 InnoDB Page Compression ........................................................................... 3065
15.10 InnoDB Row Formats ............................................................................................ 3068
15.11 InnoDB Disk I/O and File Space Management ........................................................ 3074
15.11.1 InnoDB Disk I/O .......................................................................................... 3075
15.11.2 File Space Management ............................................................................. 3075
15.11.3 InnoDB Checkpoints ................................................................................... 3077
15.11.4 Defragmenting a Table ................................................................................ 3077
15.11.5 Reclaiming Disk Space with TRUNCATE TABLE .......................................... 3078
15.12 InnoDB and Online DDL ........................................................................................ 3078
15.12.1 Online DDL Operations ............................................................................... 3079
15.12.2 Online DDL Performance and Concurrency .................................................. 3093
15.12.3 Online DDL Space Requirements ................................................................ 3096
15.12.4 Online DDL Memory Management ............................................................... 3097
15.12.5 Configuring Parallel Threads for Online DDL Operations ............................... 3097
15.12.6 Simplifying DDL Statements with Online DDL ............................................... 3097
15.12.7 Online DDL Failure Conditions .................................................................... 3098
15.12.8 Online DDL Limitations ................................................................................ 3098
15.13 InnoDB Data-at-Rest Encryption ............................................................................. 3099
15.14 InnoDB Startup Options and System Variables ........................................................ 3108
15.15 InnoDB INFORMATION_SCHEMA Tables .............................................................. 3195
15.15.1 InnoDB INFORMATION_SCHEMA Tables about Compression ...................... 3196
15.15.2 InnoDB INFORMATION_SCHEMA Transaction and Locking Information ........ 3197
15.15.3 InnoDB INFORMATION_SCHEMA Schema Object Tables ............................ 3204
15.15.4 InnoDB INFORMATION_SCHEMA FULLTEXT Index Tables ......................... 3209
15.15.5 InnoDB INFORMATION_SCHEMA Buffer Pool Tables .................................. 3212
15.15.6 InnoDB INFORMATION_SCHEMA Metrics Table ......................................... 3216
15.15.7 InnoDB INFORMATION_SCHEMA Temporary Table Info Table .................... 3224
15.15.8 Retrieving InnoDB Tablespace Metadata from
INFORMATION_SCHEMA.FILES ............................................................................. 3225
15.16 InnoDB Integration with MySQL Performance Schema ............................................ 3227
15.16.1 Monitoring ALTER TABLE Progress for InnoDB Tables Using Performance
Schema .................................................................................................................. 3229
15.16.2 Monitoring InnoDB Mutex Waits Using Performance Schema ........................ 3230
15.17 InnoDB Monitors .................................................................................................... 3234
15.17.1 InnoDB Monitor Types ................................................................................ 3234
15.17.2 Enabling InnoDB Monitors ........................................................................... 3234
15.17.3 InnoDB Standard Monitor and Lock Monitor Output ...................................... 3236
15.18 InnoDB Backup and Recovery ................................................................................ 3240
15.18.1 InnoDB Backup ........................................................................................... 3240
15.18.2 InnoDB Recovery ........................................................................................ 3241
15.19 InnoDB and MySQL Replication ............................................................................. 3244
15.20 InnoDB memcached Plugin .................................................................................... 3246
15.20.1 Benefits of the InnoDB memcached Plugin ................................................... 3246
15.20.2 InnoDB memcached Architecture ................................................................. 3247
15.20.3 Setting Up the InnoDB memcached Plugin ................................................... 3251
15.20.4 InnoDB memcached Multiple get and Range Query Support .......................... 3256
15.20.5 Security Considerations for the InnoDB memcached Plugin ........................... 3259
15.20.6 Writing Applications for the InnoDB memcached Plugin ................................. 3260
15.20.7 The InnoDB memcached Plugin and Replication ........................................... 3272
15.20.8 InnoDB memcached Plugin Internals ............................................................ 3276
15.20.9 Troubleshooting the InnoDB memcached Plugin ........................................... 3280
15.21 InnoDB Troubleshooting ......................................................................................... 3282
15.21.1 Troubleshooting InnoDB I/O Problems ......................................................... 3283
15.21.2 Troubleshooting Recovery Failures .............................................................. 3283
15.21.3 Forcing InnoDB Recovery ........................................................................... 3284
15.21.4 Troubleshooting InnoDB Data Dictionary Operations ..................................... 3285
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MySQL 8.0 Reference Manual
15.21.5 InnoDB Error Handling ................................................................................ 3286
15.22 InnoDB Limits ........................................................................................................ 3287
15.23 InnoDB Restrictions and Limitations ....................................................................... 3288
16 Alternative Storage Engines ................................................................................................ 3291
16.1 Setting the Storage Engine ...................................................................................... 3294
16.2 The MyISAM Storage Engine ................................................................................... 3295
16.2.1 MyISAM Startup Options ............................................................................... 3298
16.2.2 Space Needed for Keys ................................................................................ 3299
16.2.3 MyISAM Table Storage Formats .................................................................... 3299
16.2.4 MyISAM Table Problems ............................................................................... 3302
16.3 The MEMORY Storage Engine ................................................................................ 3303
16.4 The CSV Storage Engine ........................................................................................ 3308
16.4.1 Repairing and Checking CSV Tables ............................................................. 3309
16.4.2 CSV Limitations ............................................................................................ 3309
16.5 The ARCHIVE Storage Engine ................................................................................. 3309
16.6 The BLACKHOLE Storage Engine ........................................................................... 3311
16.7 The MERGE Storage Engine ................................................................................... 3313
16.7.1 MERGE Table Advantages and Disadvantages .............................................. 3316
16.7.2 MERGE Table Problems ............................................................................... 3317
16.8 The FEDERATED Storage Engine ........................................................................... 3318
16.8.1 FEDERATED Storage Engine Overview ......................................................... 3318
16.8.2 How to Create FEDERATED Tables .............................................................. 3320
16.8.3 FEDERATED Storage Engine Notes and Tips ................................................ 3322
16.8.4 FEDERATED Storage Engine Resources ....................................................... 3324
16.9 The EXAMPLE Storage Engine ................................................................................ 3324
16.10 Other Storage Engines .......................................................................................... 3324
16.11 Overview of MySQL Storage Engine Architecture .................................................... 3324
16.11.1 Pluggable Storage Engine Architecture ........................................................ 3326
16.11.2 The Common Database Server Layer .......................................................... 3326
17 Replication ......................................................................................................................... 3329
17.1 Configuring Replication ............................................................................................ 3331
17.1.1 Binary Log File Position Based Replication Configuration Overview ................. 3331
17.1.2 Setting Up Binary Log File Position Based Replication .................................... 3332
17.1.3 Replication with Global Transaction Identifiers ................................................ 3343
17.1.4 Changing GTID Mode on Online Servers ....................................................... 3366
17.1.5 MySQL Multi-Source Replication ................................................................... 3372
17.1.6 Replication and Binary Logging Options and Variables .................................... 3379
17.1.7 Common Replication Administration Tasks ..................................................... 3492
17.2 Replication Implementation ...................................................................................... 3498
17.2.1 Replication Formats ...................................................................................... 3499
17.2.2 Replication Channels .................................................................................... 3506
17.2.3 Replication Threads ...................................................................................... 3510
17.2.4 Relay Log and Replication Metadata Repositories .......................................... 3513
17.2.5 How Servers Evaluate Replication Filtering Rules ........................................... 3520
17.3 Replication Security ................................................................................................. 3528
17.3.1 Setting Up Replication to Use Encrypted Connections .................................... 3528
17.3.2 Encrypting Binary Log Files and Relay Log Files ............................................ 3531
17.3.3 Replication Privilege Checks ......................................................................... 3535
17.4 Replication Solutions ............................................................................................... 3541
17.4.1 Using Replication for Backups ....................................................................... 3542
17.4.2 Handling an Unexpected Halt of a Replica ..................................................... 3545
17.4.3 Monitoring Row-based Replication ................................................................. 3548
17.4.4 Using Replication with Different Source and Replica Storage Engines .............. 3548
17.4.5 Using Replication for Scale-Out ..................................................................... 3549
17.4.6 Replicating Different Databases to Different Replicas ...................................... 3551
17.4.7 Improving Replication Performance ................................................................ 3552
17.4.8 Switching Sources During Failover ................................................................ 3553
17.4.9 Switching Sources and Replicas with Asynchronous Connection Failover ......... 3556
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MySQL 8.0 Reference Manual
17.4.10 Semisynchronous Replication ...................................................................... 3559
17.4.11 Delayed Replication .................................................................................... 3565
17.5 Replication Notes and Tips ...................................................................................... 3568
17.5.1 Replication Features and Issues .................................................................... 3568
17.5.2 Replication Compatibility Between MySQL Versions ....................................... 3595
17.5.3 Upgrading a Replication Setup ...................................................................... 3596
17.5.4 Troubleshooting Replication .......................................................................... 3597
17.5.5 How to Report Replication Bugs or Problems ................................................. 3598
18 Group Replication .............................................................................................................. 3601
18.1 Group Replication Background ................................................................................. 3602
18.1.1 Replication Technologies ............................................................................... 3603
18.1.2 Group Replication Use Cases ....................................................................... 3606
18.1.3 Multi-Primary and Single-Primary Modes ........................................................ 3607
18.1.4 Group Replication Services ........................................................................... 3611
18.1.5 Group Replication Plugin Architecture ............................................................ 3613
18.2 Getting Started ........................................................................................................ 3615
18.2.1 Deploying Group Replication in Single-Primary Mode ...................................... 3615
18.2.2 Deploying Group Replication Locally .............................................................. 3628
18.3 Requirements and Limitations .................................................................................. 3629
18.3.1 Group Replication Requirements ................................................................... 3629
18.3.2 Group Replication Limitations ........................................................................ 3631
18.4 Monitoring Group Replication ................................................................................... 3634
18.4.1 GTIDs and Group Replication ........................................................................ 3635
18.4.2 Group Replication Server States .................................................................... 3636
18.4.3 The replication_group_members Table .......................................................... 3636
18.4.4 The replication_group_member_stats Table ................................................... 3637
18.5 Group Replication Operations .................................................................................. 3637
18.5.1 Configuring an Online Group ......................................................................... 3638
18.5.2 Transaction Consistency Guarantees ............................................................. 3643
18.5.3 Distributed Recovery ..................................................................................... 3649
18.5.4 Network Partitioning ...................................................................................... 3664
18.5.5 Support For IPv6 And For Mixed IPv6 And IPv4 Groups ................................. 3669
18.5.6 Using MySQL Enterprise Backup with Group Replication ................................ 3671
18.6 Group Replication Security ....................................................................................... 3677
18.6.1 Methods for Connection Security Management ............................................... 3677
18.6.2 Securing Group Communication Connections with Secure Socket Layer (SSL) . 3679
18.6.3 Securing Distributed Recovery Connections ................................................... 3681
18.6.4 Group Replication IP Address Permissions .................................................... 3685
18.7 Group Replication Performance ................................................................................ 3688
18.7.1 Fine Tuning the Group Communication Thread .............................................. 3688
18.7.2 Flow Control ................................................................................................. 3688
18.7.3 Single Consensus Leader ............................................................................. 3690
18.7.4 Message Compression .................................................................................. 3690
18.7.5 Message Fragmentation ................................................................................ 3692
18.7.6 XCom Cache Management ........................................................................... 3693
18.7.7 Responses to Failure Detection and Network Partitioning ................................ 3695
18.8 Upgrading Group Replication ................................................................................... 3701
18.8.1 Combining Different Member Versions in a Group .......................................... 3701
18.8.2 Group Replication Offline Upgrade ................................................................ 3703
18.8.3 Group Replication Online Upgrade ................................................................ 3704
18.9 Group Replication System Variables ......................................................................... 3707
18.10 Frequently Asked Questions ................................................................................... 3749
19 MySQL Shell ...................................................................................................................... 3755
20 Using MySQL as a Document Store ................................................................................... 3757
20.1 Interfaces to a MySQL Document Store .................................................................... 3758
20.2 Document Store Concepts ....................................................................................... 3758
20.3 JavaScript Quick-Start Guide: MySQL Shell for Document Store ................................ 3759
20.3.1 MySQL Shell ................................................................................................ 3760
xviii
MySQL 8.0 Reference Manual
20.3.2 Download and Import world_x Database ........................................................ 3761
20.3.3 Documents and Collections ........................................................................... 3762
20.3.4 Relational Tables .......................................................................................... 3772
20.3.5 Documents in Tables .................................................................................... 3778
20.4 Python Quick-Start Guide: MySQL Shell for Document Store ..................................... 3779
20.4.1 MySQL Shell ................................................................................................ 3779
20.4.2 Download and Import world_x Database ........................................................ 3781
20.4.3 Documents and Collections ........................................................................... 3781
20.4.4 Relational Tables .......................................................................................... 3792
20.4.5 Documents in Tables .................................................................................... 3798
20.5 X Plugin .................................................................................................................. 3799
20.5.1 Checking X Plugin Installation ....................................................................... 3799
20.5.2 Disabling X Plugin ........................................................................................ 3799
20.5.3 Using Encrypted Connections with X Plugin ................................................... 3799
20.5.4 Using X Plugin with the Caching SHA-2 Authentication Plugin ......................... 3800
20.5.5 Connection Compression with X Plugin .......................................................... 3801
20.5.6 X Plugin Options and Variables ..................................................................... 3804
20.5.7 Monitoring X Plugin ...................................................................................... 3824
21 InnoDB Cluster ................................................................................................................... 3827
22 InnoDB ReplicaSet ............................................................................................................. 3831
23 MySQL NDB Cluster 8.0 .................................................................................................... 3833
23.1 General Information ................................................................................................. 3835
23.2 NDB Cluster Overview ............................................................................................. 3837
23.2.1 NDB Cluster Core Concepts .......................................................................... 3838
23.2.2 NDB Cluster Nodes, Node Groups, Fragment Replicas, and Partitions ............. 3841
23.2.3 NDB Cluster Hardware, Software, and Networking Requirements .................... 3843
23.2.4 What is New in NDB Cluster ......................................................................... 3845
23.2.5 Options, Variables, and Parameters Added, Deprecated or Removed in NDB
8.0 .......................................................................................................................... 3867
23.2.6 MySQL Server Using InnoDB Compared with NDB Cluster ............................. 3872
23.2.7 Known Limitations of NDB Cluster ................................................................. 3875
23.3 NDB Cluster Installation ........................................................................................... 3886
23.3.1 Installation of NDB Cluster on Linux .............................................................. 3888
23.3.2 Installing NDB Cluster on Windows ............................................................... 3896
23.3.3 Initial Configuration of NDB Cluster ............................................................... 3905
23.3.4 Initial Startup of NDB Cluster ........................................................................ 3907
23.3.5 NDB Cluster Example with Tables and Data .................................................. 3907
23.3.6 Safe Shutdown and Restart of NDB Cluster ................................................... 3911
23.3.7 Upgrading and Downgrading NDB Cluster ..................................................... 3911
23.3.8 The NDB Cluster Auto-Installer (No longer supported) .................................... 3914
23.4 Configuration of NDB Cluster ................................................................................... 3934
23.4.1 Quick Test Setup of NDB Cluster .................................................................. 3935
23.4.2 Overview of NDB Cluster Configuration Parameters, Options, and Variables ..... 3937
23.4.3 NDB Cluster Configuration Files .................................................................... 3957
23.4.4 Using High-Speed Interconnects with NDB Cluster ......................................... 4131
23.5 NDB Cluster Programs ............................................................................................ 4132
23.5.1 ndbd — The NDB Cluster Data Node Daemon ............................................... 4132
23.5.2 ndbinfo_select_all — Select From ndbinfo Tables ........................................... 4142
23.5.3 ndbmtd — The NDB Cluster Data Node Daemon (Multi-Threaded) .................. 4147
23.5.4 ndb_mgmd — The NDB Cluster Management Server Daemon ........................ 4148
23.5.5 ndb_mgm — The NDB Cluster Management Client ........................................ 4160
23.5.6 ndb_blob_tool — Check and Repair BLOB and TEXT columns of NDB Cluster
Tables ..................................................................................................................... 4165
23.5.7 ndb_config — Extract NDB Cluster Configuration Information .......................... 4171
23.5.8 ndb_delete_all — Delete All Rows from an NDB Table ................................... 4183
23.5.9 ndb_desc — Describe NDB Tables ............................................................... 4187
23.5.10 ndb_drop_index — Drop Index from an NDB Table ....................................... 4197
23.5.11 ndb_drop_table — Drop an NDB Table ........................................................ 4201
xix
MySQL 8.0 Reference Manual
23.5.12 ndb_error_reporter — NDB Error-Reporting Utility ......................................... 4205
23.5.13 ndb_import — Import CSV Data Into NDB .................................................... 4207
23.5.14 ndb_index_stat — NDB Index Statistics Utility .............................................. 4223
23.5.15 ndb_move_data — NDB Data Copy Utility ................................................... 4231
23.5.16 ndb_perror — Obtain NDB Error Message Information .................................. 4236
23.5.17 ndb_print_backup_file — Print NDB Backup File Contents ............................. 4239
23.5.18 ndb_print_file — Print NDB Disk Data File Contents ..................................... 4244
23.5.19 ndb_print_frag_file — Print NDB Fragment List File Contents ........................ 4244
23.5.20 ndb_print_schema_file — Print NDB Schema File Contents ........................... 4245
23.5.21 ndb_print_sys_file — Print NDB System File Contents .................................. 4245
23.5.22 ndb_redo_log_reader — Check and Print Content of Cluster Redo Log .......... 4246
23.5.23 ndb_restore — Restore an NDB Cluster Backup ........................................... 4248
23.5.24 ndb_select_all — Print Rows from an NDB Table ......................................... 4280
23.5.25 ndb_select_count — Print Row Counts for NDB Tables ................................. 4286
23.5.26 ndb_setup.py — Start browser-based Auto-Installer for NDB Cluster
(DEPRECATED) ...................................................................................................... 4290
23.5.27 ndb_show_tables — Display List of NDB Tables ........................................... 4294
23.5.28 ndb_size.pl — NDBCLUSTER Size Requirement Estimator ........................... 4298
23.5.29 ndb_top — View CPU usage information for NDB threads ............................. 4301
23.5.30 ndb_waiter — Wait for NDB Cluster to Reach a Given Status ........................ 4306
23.5.31 ndbxfrm — Compress, Decompress, Encrypt, and Decrypt Files Created by
NDB Cluster ............................................................................................................ 4312
23.6 Management of NDB Cluster ................................................................................... 4316
23.6.1 Commands in the NDB Cluster Management Client ........................................ 4316
23.6.2 NDB Cluster Log Messages .......................................................................... 4322
23.6.3 Event Reports Generated in NDB Cluster ...................................................... 4341
23.6.4 Summary of NDB Cluster Start Phases .......................................................... 4352
23.6.5 Performing a Rolling Restart of an NDB Cluster ............................................. 4354
23.6.6 NDB Cluster Single User Mode ..................................................................... 4356
23.6.7 Adding NDB Cluster Data Nodes Online ........................................................ 4357
23.6.8 Online Backup of NDB Cluster ...................................................................... 4367
23.6.9 MySQL Server Usage for NDB Cluster .......................................................... 4373
23.6.10 NDB Cluster Disk Data Tables .................................................................... 4375
23.6.11 Online Operations with ALTER TABLE in NDB Cluster .................................. 4381
23.6.12 Distributed MySQL Privileges with NDB_STORED_USER ............................. 4384
23.6.13 NDB API Statistics Counters and Variables .................................................. 4385
23.6.14 ndbinfo: The NDB Cluster Information Database ........................................... 4395
23.6.15 INFORMATION_SCHEMA Tables for NDB Cluster ....................................... 4465
23.6.16 Quick Reference: NDB Cluster SQL Statements ........................................... 4465
23.6.17 NDB Cluster Security Issues ....................................................................... 4471
23.7 NDB Cluster Replication .......................................................................................... 4479
23.7.1 NDB Cluster Replication: Abbreviations and Symbols ..................................... 4480
23.7.2 General Requirements for NDB Cluster Replication ........................................ 4481
23.7.3 Known Issues in NDB Cluster Replication ...................................................... 4482
23.7.4 NDB Cluster Replication Schema and Tables ................................................. 4488
23.7.5 Preparing the NDB Cluster for Replication ..................................................... 4495
23.7.6 Starting NDB Cluster Replication (Single Replication Channel) ........................ 4497
23.7.7 Using Two Replication Channels for NDB Cluster Replication .......................... 4498
23.7.8 Implementing Failover with NDB Cluster Replication ....................................... 4499
23.7.9 NDB Cluster Backups With NDB Cluster Replication ....................................... 4501
23.7.10 NDB Cluster Replication: Bidrectional and Circular Replication ...................... 4507
23.7.11 NDB Cluster Replication Conflict Resolution ................................................. 4511
23.8 NDB Cluster Release Notes ..................................................................................... 4523
24 Partitioning ......................................................................................................................... 4525
24.1 Overview of Partitioning in MySQL ........................................................................... 4526
24.2 Partitioning Types .................................................................................................... 4529
24.2.1 RANGE Partitioning ...................................................................................... 4530
24.2.2 LIST Partitioning ........................................................................................... 4534
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