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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 ...

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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 ...

    Introduction to Mybatis - add, delete, modify and query a single table based on configuration Introduction to Mybatis Configuration steps Use steps (all xml configurations have been configured) Basic data Entity class Interface of DAO layer Master profile Sub profile Test class  summary Introduction to Mybatis Official ...

Transaction 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 ...

background 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. Analysis process Generally, in case of replication delay, let's first look at the replication status and active session of the slave library. ...

node.js link database 1. Premise 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 ...

0. Front 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 ...

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 ...

MySQL data synchronization scheme practice   prepare MySQL 5.6Canal 1.0.24Kafka 1.0.0Zookeeper 3.4.11Spring BootJDK 8IntelliJ Idea 14.1.7 background 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 ...