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need a heartbeat query‘s example from outside to check if dble is alive

Wrong Schema name in example 5）sequence_db_conf.properties which is different from what configed in sharding.xml of the example 4）sharding.xml.

Extra columns may exists on the line of \ on the page Function & Operators

The hyperlink "1.4_wrapper.conf" is invalid in 1.02_bootstrap.cnf file of conf_V3

version:2.19.09.0
eg: heartbeat timeout default 0

A column needs to be added to explain what operations are required for the parameter items of each xml file to take effect，such as reload? reload-all? or restart dble?

https://actiontech.github.io/dble-docs-cn/3.SQL_Syntax/3.1_DDL/3.1.2_DDL&View_Syntax.html

Feel free to fix it or not :)

The file custom_mysql_ha.py is just a demo, which requires secondary development before it can be used in the production environment. We should improve file description 2.12_failover.html

https://actiontech.github.io/dble-docs-cn/1.config_file/1.7_global_sequence/1.7.3_distribute_timestamp.html

The reference example should at least have the check attribute.

上面的报错因为镜像中的配置不是很齐全，比如sharding.xml中testdb中没有配置tb_test2表、user.xml中root用户只能访问testdb;（可以进入容器调整配置），并不影响dble的使用

Improvement:

• The algorithm of stringhash is not clearly described, users hope to improve it.
• In chapter about sysbench, some sysbench paramaters are outdated. users hope to update to improve it or provide paramaters of lastest version

konwn problem of dble 1507 actiontech/dble#1507

Document address：https://github.com/actiontech/dble-docs-cn/blob/56ca7ba451/2.Function/2.5_distribute_transaction/2.5.2_XA_trans_commit%26rollback.md
/label ~BUG

When the value of group_concat_max_len on the backend mysql instance is changed to custom vaule, it can be adapted by configuring groupConcatMaxLe in the bootstrap.cnf file. But it is not documented in bootstrap.cnf's documentation.

Please check if there are any other missing items.

dble 2.19.03/lts has an extraordinary lifetime. Thus, we ask the doc project to have a specified branch for it.

这个increment字段指的不是每个id会间隔多少，而是每多少个id，再去取一批新的id用来分配
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或添加超链接到 actiontech/dble#2945