The catcache code is located at src/backend/utils/cache/catcache.c, which contains links and operations to initialize SysCache structures and pointer relationships between data structures.
Finding tuples in CatCache
There are two ways to find tuples in a CatCache: exactly matching the SearchCatCache and partially matching the SearchCatcac ...
Posted by hanhao on Thu, 10 Mar 2022 19:05:13 +0100
🍅 Programmer Xiao Wang's blog: Programmer Xiao Wang's blog
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🍅 Learning route of java self-study: Learning route of ...
No Dialect mapping for JDBC type: 1111 problem solution
Error reporting reason
Because each database has its own dialect, and the simple understanding of dialect is to make a mapping relationship for the unique data types and functions of some databases, and 1111 can't find the corresponding value of dialect because there is no mapping relati ...
Posted by strangesoul on Thu, 10 Mar 2022 04:23:36 +0100
Introduction to Mybatis - add, delete, modify and query a single table based on configuration
Introduction to Mybatis
Use steps (all xml configurations have been configured)
Interface of DAO layer
Introduction to Mybatis
Posted by alexrait1 on Wed, 09 Mar 2022 14:14:25 +0100
What is a transaction?
A smallest non separable work unit;
Usually, a transaction corresponds to a complete business (for example, bank account transfer business, which is the smallest work unit) A complete business requires batch DML(insert, update, delete) statements to be jointly completed
Transactions are only related ...
Posted by MarineX69 on Wed, 09 Mar 2022 13:00:20 +0100
Received alarm, content: MySQL_ The master-slave replication delay is too high (example: XXXX), current value: 1032.00, threshold: 1000 - 100000000, occurrence time: 12 / 30 / 2021 02:27:16.
Generally, in case of replication delay, let's first look at the replication status and active session of the slave library. ...
Posted by swasheck on Wed, 09 Mar 2022 02:35:03 +0100
node.js link database
The computer has node installed. You can use the win+R key, enter cmd, and then enter node -v to check the version; Then enter npm -V to check the installed version of npm After all the above, create an empty folder named projects, which creates three empty folders: JQ, HTML and API In the jq folder, impo ...
Posted by jibosh on Tue, 08 Mar 2022 13:55:17 +0100
The previous article recorded the Shell operation and Java API operation of HBase, but the operation process is still cumbersome [track of HBase] (2) use HBase command and Java API to operate HBase (including complex query - filter and HBase tool class)
It would be nice if you could write SQL operation database like MySQL, and ...
Posted by clarket on Tue, 08 Mar 2022 06:42:16 +0100
Frame introductionAccording to the Convention, first introduce the protagonists of this issue: ShardingCore A high-performance, lightweight solution for reading and writing separation of tables and databases under ef core, with zero dependency, zero learning cost and zero business code intrusionThe only fully automatic sub table and multi field ...
Posted by oneofayykind on Tue, 08 Mar 2022 03:46:52 +0100
MySQL data synchronization scheme practice
MySQL 5.6Canal 1.0.24Kafka 1.0.0Zookeeper 3.4.11Spring BootJDK 8IntelliJ Idea 14.1.7
In practice, it is common for multiple systems to use the same user and other business data. With the iterative development of requirements, the number of systems increases. The business data c ...
Posted by nitram on Tue, 08 Mar 2022 03:44:32 +0100