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首页MySQL 5.7开发手册:数据库表结构解析
MySQL 5.7开发手册:数据库表结构解析
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更新于2024-07-21
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"MySQL 5.7 Reference Manual 是一本详细记录 MySQL 5.7 版本的官方开发手册,包含了从 5.7.0 到 5.7.11 的所有特性。该手册主要关注如何获取数据库表结构、字段信息、数据类型、是否可空、最大长度以及备注等关键内容,适合于需要深入了解 MySQL 5.7 的开发者和管理员使用。然而,MySQL Cluster 在 MySQL 5.7 中未被支持,如需了解相关信息,需参考 MySQL Cluster NDB 7.3 和 7.4。此外,手册中也指出,不是所有的 5.7 版本特性都包含在每个发行版中,具体包含哪些特性需要参照你的 MySQL 5.7 许可协议或咨询 Oracle 销售代表。对于每个版本的更新详情,可以查阅 MySQL 5.7 Release Notes。若寻求法律信息,需查看 Legal Notices。遇到问题时,可以在 MySQL 论坛或邮件列表中与其他用户交流。更多 MySQL 相关的文档,包括其他语言的翻译版本和多种格式的下载选项,可在 MySQL Documentation Library 找到。"
MySQL 5.7 引入了多个关键知识点:
1. **表结构与字段信息**:手册提供了解析数据库表结构的方法,包括如何获取表中的字段名称、数据类型、是否允许为空(NULLable)、最大长度以及字段的注释(Comment)。
2. **数据类型**:MySQL 5.7 支持多种数据类型,如数值类型(INT, FLOAT, DECIMAL等)、字符串类型(VARCHAR, CHAR, TEXT等)、日期和时间类型(DATE, TIME, TIMESTAMP等)以及二进制类型(BLOB, BINARY等)。
3. **查询优化**:手册可能涵盖了查询优化器的改进,包括EXPLAIN语句的使用,以及如何通过索引和查询结构调整来提高查询性能。
4. **存储引擎**:MySQL 5.7 支持多种存储引擎,如InnoDB(事务处理和行级锁定),MyISAM(非事务处理和快速读取),以及ARCHIVE等,每种引擎都有其特定的使用场景。
5. **安全性**:可能涉及用户权限管理、加密、审计日志等方面,以确保数据库的安全性。
6. **复制与高可用**:MySQL 5.7 提供了主从复制和组复制功能,用于实现数据备份和故障恢复。
7. **分区与分片**:对于大型数据库,手册可能涵盖如何使用分区策略来提高查询效率。
8. **触发器与存储过程**:这些高级特性允许在数据库级别定义复杂的业务逻辑。
9. **性能监控**:包括性能_schema表的使用,以监控和分析数据库性能。
10. **InnoDB Cluster**:尽管MySQL 5.7不直接支持MySQL Cluster,但可能会提及InnoDB Cluster作为替代的高可用解决方案。
11. **JSON支持**:MySQL 5.7 添加了对JSON数据类型的原生支持,方便存储和查询JSON格式的数据。
12. **SQL标准兼容性**:MySQL 5.7在兼容性方面做了改进,更接近于SQL标准。
13. **新语法和函数**:可能包含了新的SQL语法元素和内置函数,使得编程更加便捷。
14. **错误处理与日志**:关于错误报告、日志记录和调试的信息也是手册的重要组成部分。
15. **性能提升**:可能包括内存管理和缓存优化,以及查询执行计划的改进。
16. **备份与恢复**:详述了如何进行全量和增量备份,以及如何从备份中恢复数据。
17. **MySQL Shell**:MySQL 5.7 引入了新的命令行工具MySQL Shell,提供了一个统一的界面来交互式地管理数据库。
MySQL 5.7 Reference Manual 是一个全面的指南,涵盖了从数据库设计、操作、优化到安全管理的各个方面,对于任何在MySQL 5.7环境中工作的开发人员和管理员来说,都是不可或缺的参考资料。
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MySQL 5.7 Reference Manual
xvi
15.8.3 FEDERATED Storage Engine Notes and Tips ..................................................... 2465
15.8.4 FEDERATED Storage Engine Resources ............................................................ 2466
15.9 The EXAMPLE Storage Engine ..................................................................................... 2466
15.10 Other Storage Engines ................................................................................................ 2467
15.11 Overview of MySQL Storage Engine Architecture ......................................................... 2467
15.11.1 Pluggable Storage Engine Architecture .............................................................. 2467
15.11.2 The Common Database Server Layer ............................................................... 2468
16 High Availability and Scalability ................................................................................................ 2471
16.1 Using MySQL within an Amazon EC2 Instance .............................................................. 2473
16.1.1 Setting Up MySQL on an EC2 AMI ..................................................................... 2474
16.1.2 EC2 Instance Limitations .................................................................................... 2475
16.1.3 Deploying a MySQL Database Using EC2 ........................................................... 2476
16.2 Using ZFS Replication .................................................................................................. 2478
16.2.1 Using ZFS for File System Replication ................................................................ 2480
16.2.2 Configuring MySQL for ZFS Replication .............................................................. 2481
16.2.3 Handling MySQL Recovery with ZFS .................................................................. 2481
16.3 Using MySQL with memcached ..................................................................................... 2482
16.3.1 Installing memcached ......................................................................................... 2483
16.3.2 Using memcached ............................................................................................. 2484
16.3.3 Developing a memcached Application ................................................................. 2504
16.3.4 Getting memcached Statistics ............................................................................. 2530
16.3.5 memcached FAQ ............................................................................................... 2539
17 Replication .............................................................................................................................. 2543
17.1 Configuring Replication ................................................................................................. 2544
17.1.1 Binary Log File Position Based Replication Configuration Overview ....................... 2545
17.1.2 Setting Up Binary Log File Position Based Replication ......................................... 2545
17.1.3 Replication with Global Transaction Identifiers ..................................................... 2555
17.1.4 MySQL Multi-Source Replication ......................................................................... 2565
17.1.5 Changing Replication Modes on Online Servers .................................................. 2568
17.1.6 Replication and Binary Logging Options and Variables ......................................... 2575
17.1.7 Common Replication Administration Tasks .......................................................... 2665
17.2 Replication Implementation ........................................................................................... 2668
17.2.1 Replication Formats ........................................................................................... 2669
17.2.2 Replication Implementation Details ...................................................................... 2676
17.2.3 Replication Channels ......................................................................................... 2678
17.2.4 Replication Relay and Status Logs ..................................................................... 2681
17.2.5 How Servers Evaluate Replication Filtering Rules ................................................ 2687
17.3 Replication Solutions .................................................................................................... 2693
17.3.1 Using Replication for Backups ............................................................................ 2694
17.3.2 Using Replication with Different Master and Slave Storage Engines ....................... 2697
17.3.3 Using Replication for Scale-Out .......................................................................... 2699
17.3.4 Replicating Different Databases to Different Slaves .............................................. 2700
17.3.5 Improving Replication Performance ..................................................................... 2701
17.3.6 Switching Masters During Failover ...................................................................... 2702
17.3.7 Setting Up Replication Using SSL ....................................................................... 2704
17.3.8 Semisynchronous Replication ............................................................................. 2706
17.3.9 Delayed Replication ........................................................................................... 2711
17.4 Replication Notes and Tips ........................................................................................... 2712
17.4.1 Replication Features and Issues ......................................................................... 2712
17.4.2 Replication Compatibility Between MySQL Versions ............................................. 2739
17.4.3 Upgrading a Replication Setup ........................................................................... 2740
17.4.4 Troubleshooting Replication ................................................................................ 2741
17.4.5 How to Report Replication Bugs or Problems ...................................................... 2743
18 Partitioning .............................................................................................................................. 2745
![](https://csdnimg.cn/release/download_crawler_static/9396916/bg11.jpg)
MySQL 5.7 Reference Manual
xvii
18.1 Overview of Partitioning in MySQL ................................................................................ 2747
18.2 Partitioning Types ......................................................................................................... 2750
18.2.1 RANGE Partitioning ........................................................................................... 2751
18.2.2 LIST Partitioning ................................................................................................ 2756
18.2.3 COLUMNS Partitioning ....................................................................................... 2758
18.2.4 HASH Partitioning .............................................................................................. 2766
18.2.5 KEY Partitioning ................................................................................................ 2769
18.2.6 Subpartitioning ................................................................................................... 2771
18.2.7 How MySQL Partitioning Handles NULL .............................................................. 2774
18.3 Partition Management ................................................................................................... 2779
18.3.1 Management of RANGE and LIST Partitions ....................................................... 2780
18.3.2 Management of HASH and KEY Partitions .......................................................... 2786
18.3.3 Exchanging Partitions and Subpartitions with Tables ............................................ 2787
18.3.4 Maintenance of Partitions ................................................................................... 2795
18.3.5 Obtaining Information About Partitions ................................................................ 2796
18.4 Partition Pruning ........................................................................................................... 2798
18.5 Partition Selection ......................................................................................................... 2802
18.6 Restrictions and Limitations on Partitioning .................................................................... 2808
18.6.1 Partitioning Keys, Primary Keys, and Unique Keys ............................................... 2814
18.6.2 Partitioning Limitations Relating to Storage Engines ............................................. 2818
18.6.3 Partitioning Limitations Relating to Functions ....................................................... 2819
18.6.4 Partitioning and Locking ..................................................................................... 2819
19 Stored Programs and Views .................................................................................................... 2821
19.1 Defining Stored Programs ............................................................................................. 2822
19.2 Using Stored Routines (Procedures and Functions) ........................................................ 2823
19.2.1 Stored Routine Syntax ....................................................................................... 2824
19.2.2 Stored Routines and MySQL Privileges ............................................................... 2824
19.2.3 Stored Routine Metadata .................................................................................... 2825
19.2.4 Stored Procedures, Functions, Triggers, and LAST_INSERT_ID() ......................... 2825
19.3 Using Triggers .............................................................................................................. 2825
19.3.1 Trigger Syntax and Examples ............................................................................. 2826
19.3.2 Trigger Metadata ............................................................................................... 2830
19.4 Using the Event Scheduler ............................................................................................ 2830
19.4.1 Event Scheduler Overview ................................................................................. 2831
19.4.2 Event Scheduler Configuration ............................................................................ 2832
19.4.3 Event Syntax ..................................................................................................... 2834
19.4.4 Event Metadata ................................................................................................. 2834
19.4.5 Event Scheduler Status ...................................................................................... 2835
19.4.6 The Event Scheduler and MySQL Privileges ........................................................ 2836
19.5 Using Views ................................................................................................................. 2838
19.5.1 View Syntax ...................................................................................................... 2839
19.5.2 View Processing Algorithms ............................................................................... 2839
19.5.3 Updatable and Insertable Views ......................................................................... 2841
19.5.4 The View WITH CHECK OPTION Clause ............................................................ 2844
19.5.5 View Metadata ................................................................................................... 2845
19.6 Access Control for Stored Programs and Views ............................................................. 2845
19.7 Binary Logging of Stored Programs ............................................................................... 2847
20 INFORMATION_SCHEMA Tables ............................................................................................ 2853
20.1 The INFORMATION_SCHEMA CHARACTER_SETS Table ............................................ 2856
20.2 The INFORMATION_SCHEMA COLLATIONS Table ...................................................... 2857
20.3 The INFORMATION_SCHEMA COLLATION_CHARACTER_SET_APPLICABILITY Table . 2857
20.4 The INFORMATION_SCHEMA COLUMNS Table ........................................................... 2857
20.5 The INFORMATION_SCHEMA COLUMN_PRIVILEGES Table ........................................ 2859
20.6 The INFORMATION_SCHEMA ENGINES Table ............................................................ 2859
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MySQL 5.7 Reference Manual
xviii
20.7 The INFORMATION_SCHEMA EVENTS Table .............................................................. 2860
20.8 The INFORMATION_SCHEMA FILES Table .................................................................. 2863
20.9 The INFORMATION_SCHEMA GLOBAL_STATUS and SESSION_STATUS Tables ......... 2866
20.10 The INFORMATION_SCHEMA GLOBAL_VARIABLES and SESSION_VARIABLES
Tables ................................................................................................................................. 2866
20.11 The INFORMATION_SCHEMA KEY_COLUMN_USAGE Table ..................................... 2867
20.12 The INFORMATION_SCHEMA OPTIMIZER_TRACE Table ........................................... 2868
20.13 The INFORMATION_SCHEMA PARAMETERS Table ................................................... 2868
20.14 The INFORMATION_SCHEMA PARTITIONS Table ...................................................... 2869
20.15 The INFORMATION_SCHEMA PLUGINS Table ........................................................... 2872
20.16 The INFORMATION_SCHEMA PROCESSLIST Table .................................................. 2873
20.17 The INFORMATION_SCHEMA PROFILING Table ........................................................ 2874
20.18 The INFORMATION_SCHEMA REFERENTIAL_CONSTRAINTS Table .......................... 2875
20.19 The INFORMATION_SCHEMA ROUTINES Table ........................................................ 2876
20.20 The INFORMATION_SCHEMA SCHEMATA Table ....................................................... 2877
20.21 The INFORMATION_SCHEMA SCHEMA_PRIVILEGES Table ...................................... 2877
20.22 The INFORMATION_SCHEMA STATISTICS Table ...................................................... 2878
20.23 The INFORMATION_SCHEMA TABLES Table ............................................................. 2879
20.24 The INFORMATION_SCHEMA TABLESPACES Table .................................................. 2880
20.25 The INFORMATION_SCHEMA TABLE_CONSTRAINTS Table ...................................... 2881
20.26 The INFORMATION_SCHEMA TABLE_PRIVILEGES Table .......................................... 2881
20.27 The INFORMATION_SCHEMA TRIGGERS Table ........................................................ 2881
20.28 The INFORMATION_SCHEMA USER_PRIVILEGES Table ........................................... 2883
20.29 The INFORMATION_SCHEMA VIEWS Table ............................................................... 2884
20.30 INFORMATION_SCHEMA Tables for InnoDB ............................................................... 2885
20.30.1 The INFORMATION_SCHEMA INNODB_CMP and INNODB_CMP_RESET
Tables ......................................................................................................................... 2886
20.30.2 The INFORMATION_SCHEMA INNODB_CMP_PER_INDEX and
INNODB_CMP_PER_INDEX_RESET Tables ................................................................. 2887
20.30.3 The INFORMATION_SCHEMA INNODB_CMPMEM and
INNODB_CMPMEM_RESET Tables .............................................................................. 2888
20.30.4 The INFORMATION_SCHEMA INNODB_TRX Table .......................................... 2889
20.30.5 The INFORMATION_SCHEMA INNODB_LOCKS Table ..................................... 2892
20.30.6 The INFORMATION_SCHEMA INNODB_LOCK_WAITS Table ........................... 2893
20.30.7 The INFORMATION_SCHEMA INNODB_SYS_TABLES Table ........................... 2894
20.30.8 The INFORMATION_SCHEMA INNODB_SYS_INDEXES Table ......................... 2896
20.30.9 The INFORMATION_SCHEMA INNODB_SYS_COLUMNS Table ....................... 2898
20.30.10 The INFORMATION_SCHEMA INNODB_SYS_FIELDS Table ........................... 2899
20.30.11 The INFORMATION_SCHEMA INNODB_SYS_FOREIGN Table ....................... 2899
20.30.12 The INFORMATION_SCHEMA INNODB_SYS_FOREIGN_COLS Table ............ 2900
20.30.13 The INFORMATION_SCHEMA INNODB_SYS_TABLESTATS View .................. 2901
20.30.14 The INFORMATION_SCHEMA INNODB_SYS_DATAFILES Table .................... 2902
20.30.15 The INFORMATION_SCHEMA INNODB_SYS_TABLESPACES Table .............. 2903
20.30.16 The INFORMATION_SCHEMA INNODB_SYS_VIRTUAL Table ........................ 2907
20.30.17 The INFORMATION_SCHEMA INNODB_BUFFER_PAGE Table ...................... 2908
20.30.18 The INFORMATION_SCHEMA INNODB_BUFFER_PAGE_LRU Table .............. 2910
20.30.19 The INFORMATION_SCHEMA INNODB_BUFFER_POOL_STATS Table .......... 2912
20.30.20 The INFORMATION_SCHEMA INNODB_METRICS Table ................................ 2914
20.30.21 The INFORMATION_SCHEMA INNODB_FT_CONFIG Table ............................ 2916
20.30.22 The INFORMATION_SCHEMA INNODB_FT_DEFAULT_STOPWORD Table ..... 2917
20.30.23 The INFORMATION_SCHEMA INNODB_FT_INDEX_TABLE Table .................. 2918
20.30.24 The INFORMATION_SCHEMA INNODB_FT_INDEX_CACHE Table ................. 2919
20.30.25 The INFORMATION_SCHEMA INNODB_FT_DELETED Table ......................... 2921
20.30.26 The INFORMATION_SCHEMA INNODB_FT_BEING_DELETED Table ............. 2921
![](https://csdnimg.cn/release/download_crawler_static/9396916/bg13.jpg)
MySQL 5.7 Reference Manual
xix
20.30.27 The INFORMATION_SCHEMA INNODB_TEMP_TABLE_INFO Table ............... 2922
20.31 Extensions to SHOW Statements ................................................................................ 2923
21 MySQL Performance Schema .................................................................................................. 2927
21.1 Performance Schema Quick Start .................................................................................. 2929
21.2 Performance Schema Configuration ............................................................................... 2935
21.2.1 Performance Schema Build Configuration ............................................................ 2935
21.2.2 Performance Schema Startup Configuration ........................................................ 2937
21.2.3 Performance Schema Runtime Configuration ....................................................... 2939
21.3 Performance Schema Queries ....................................................................................... 2960
21.4 Performance Schema Instrument Naming Conventions ................................................... 2960
21.5 Performance Schema Status Monitoring ........................................................................ 2963
21.6 Performance Schema Atom and Molecule Events ........................................................... 2966
21.7 Performance Schema Statement Digests ....................................................................... 2967
21.8 Performance Schema General Table Characteristics ...................................................... 2970
21.9 Performance Schema Table Descriptions ....................................................................... 2970
21.9.1 Performance Schema Table Index ...................................................................... 2970
21.9.2 Performance Schema Setup Tables .................................................................... 2973
21.9.3 Performance Schema Instance Tables ................................................................ 2978
21.9.4 Performance Schema Wait Event Tables ............................................................ 2983
21.9.5 Performance Schema Stage Event Tables .......................................................... 2988
21.9.6 Performance Schema Statement Event Tables .................................................... 2993
21.9.7 Performance Schema Transaction Tables ........................................................... 3003
21.9.8 Performance Schema Connection Tables ............................................................ 3010
21.9.9 Performance Schema Connection Attribute Tables ............................................... 3012
21.9.10 Performance Schema Replication Tables .......................................................... 3014
21.9.11 Performance Schema Lock Tables .................................................................... 3026
21.9.12 Performance Schema System Variable Tables ................................................... 3028
21.9.13 Performance Schema Status Variable Tables .................................................... 3029
21.9.14 Performance Schema Summary Tables ............................................................. 3031
21.9.15 Performance Schema Miscellaneous Tables ...................................................... 3051
21.10 Performance Schema Option and Variable Reference ................................................... 3060
21.11 Performance Schema Command Options ..................................................................... 3063
21.12 Performance Schema System Variables ....................................................................... 3065
21.13 Performance Schema Status Variables ........................................................................ 3081
21.14 The Performance Schema Memory-Allocation Model .................................................... 3084
21.15 Performance Schema and Plugins ............................................................................... 3085
21.16 Using the Performance Schema to Diagnose Problems ................................................. 3086
21.16.1 Query Profiling Using Performance Schema ...................................................... 3087
21.17 Migrating to Performance Schema System and Status Variable Tables ........................... 3089
22 MySQL sys Schema ................................................................................................................ 3093
22.1 Prerequisites for Using the sys Schema ......................................................................... 3093
22.2 Using the sys Schema .................................................................................................. 3094
22.3 sys Schema Progress Reporting ................................................................................... 3096
22.4 sys Schema Object Reference ...................................................................................... 3096
22.4.1 sys Schema Object Index ................................................................................... 3096
22.4.2 sys Schema Tables and Triggers ........................................................................ 3101
22.4.3 sys Schema Views ............................................................................................ 3103
22.4.4 sys Schema Stored Procedures .......................................................................... 3145
22.4.5 sys Schema Stored Functions ............................................................................ 3165
23 Connectors and APIs .............................................................................................................. 3179
23.1 MySQL Connector/ODBC .............................................................................................. 3183
23.2 MySQL Connector/Net .................................................................................................. 3183
23.3 MySQL Connector/J ..................................................................................................... 3183
23.4 MySQL Connector/C++ ................................................................................................. 3183
![](https://csdnimg.cn/release/download_crawler_static/9396916/bg14.jpg)
MySQL 5.7 Reference Manual
xx
23.5 MySQL Connector/C ..................................................................................................... 3183
23.6 MySQL Connector/Python ............................................................................................. 3183
23.7 libmysqld, the Embedded MySQL Server Library ............................................................ 3184
23.7.1 Compiling Programs with libmysqld ..................................................................... 3184
23.7.2 Restrictions When Using the Embedded MySQL Server ....................................... 3185
23.7.3 Options with the Embedded Server ..................................................................... 3185
23.7.4 Embedded Server Examples .............................................................................. 3186
23.8 MySQL C API .............................................................................................................. 3189
23.8.1 MySQL C API Implementations .......................................................................... 3190
23.8.2 Simultaneous MySQL Server and Connector/C Installations .................................. 3191
23.8.3 Example C API Client Programs ......................................................................... 3192
23.8.4 Building and Running C API Client Programs ...................................................... 3192
23.8.5 C API Data Structures ....................................................................................... 3198
23.8.6 C API Function Overview ................................................................................... 3203
23.8.7 C API Function Descriptions ............................................................................... 3208
23.8.8 C API Prepared Statements ............................................................................... 3270
23.8.9 C API Prepared Statement Data Structures ......................................................... 3270
23.8.10 C API Prepared Statement Function Overview ................................................... 3277
23.8.11 C API Prepared Statement Function Descriptions ............................................... 3279
23.8.12 C API Threaded Function Descriptions .............................................................. 3303
23.8.13 C API Embedded Server Function Descriptions ................................................. 3305
23.8.14 C API Client Plugin Functions ........................................................................... 3305
23.8.15 Common Questions and Problems When Using the C API .................................. 3309
23.8.16 Controlling Automatic Reconnection Behavior .................................................... 3310
23.8.17 C API Support for Multiple Statement Execution ................................................. 3312
23.8.18 C API Prepared Statement Problems ................................................................ 3314
23.8.19 C API Prepared Statement Handling of Date and Time Values ............................ 3314
23.8.20 C API Support for Prepared CALL Statements ................................................... 3315
23.9 MySQL PHP API .......................................................................................................... 3320
23.10 MySQL Perl API ......................................................................................................... 3320
23.11 MySQL Python API ..................................................................................................... 3321
23.12 MySQL Ruby APIs ...................................................................................................... 3321
23.12.1 The MySQL/Ruby API ...................................................................................... 3321
23.12.2 The Ruby/MySQL API ...................................................................................... 3321
23.13 MySQL Tcl API .......................................................................................................... 3321
23.14 MySQL Eiffel Wrapper ................................................................................................ 3321
24 Extending MySQL ................................................................................................................... 3323
24.1 MySQL Internals ........................................................................................................... 3323
24.1.1 MySQL Threads ................................................................................................ 3323
24.1.2 The MySQL Test Suite ....................................................................................... 3324
24.2 The MySQL Plugin API ................................................................................................. 3325
24.2.1 Plugin API Characteristics .................................................................................. 3325
24.2.2 Plugin API Components ..................................................................................... 3326
24.2.3 Types of Plugins ................................................................................................ 3327
24.2.4 Writing Plugins .................................................................................................. 3332
24.3 MySQL Services for Plugins .......................................................................................... 3387
24.3.1 The Locking Service .......................................................................................... 3389
24.4 Adding New Functions to MySQL .................................................................................. 3394
24.4.1 Features of the User-Defined Function Interface .................................................. 3395
24.4.2 Adding a New User-Defined Function ................................................................. 3395
24.4.3 Adding a New Native Function ........................................................................... 3405
24.5 Debugging and Porting MySQL ..................................................................................... 3407
24.5.1 Debugging a MySQL Server ............................................................................... 3407
24.5.2 Debugging a MySQL Client ................................................................................ 3414
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