PDF (A4) - 43.4Mb
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Man Pages (Zip) - 402.4Kb
Info (Gzip) - 4.3Mb
Info (Zip) - 4.3Mb
MySQL Globalization
MySQL Information Schema
MySQL Installation Guide
Security in MySQL
Starting and Stopping MySQL
MySQL and Linux/Unix
MySQL and Windows
MySQL and macOS
MySQL and Solaris
Building MySQL from Source
MySQL Restrictions and Limitations
MySQL Partitioning
MySQL Tutorial
MySQL Performance Schema
MySQL Replication
Using the MySQL Yum Repository
MySQL NDB Cluster 8.0
The Performance Schema provides auser_variables_by_thread table that exposes user-defined variables. These are variables defined within a specific session and include a@ character preceding the name; seeSection 11.4, “User-Defined Variables”.
Theuser_variables_by_thread table has these columns:
THREAD_IDThe thread identifier of the session in which the variable is defined.
VARIABLE_NAMEThe variable name, without the leading
@character.VARIABLE_VALUEThe variable value.
Theuser_variables_by_thread table has these indexes:
Primary key on (
THREAD_ID,VARIABLE_NAME)
TRUNCATE TABLE is not permitted for theuser_variables_by_thread table.
PDF (A4) - 43.4Mb
Man Pages (TGZ) - 297.2Kb
Man Pages (Zip) - 402.4Kb
Info (Gzip) - 4.3Mb
Info (Zip) - 4.3Mb
MySQL Globalization
MySQL Information Schema
MySQL Installation Guide
Security in MySQL
Starting and Stopping MySQL
MySQL and Linux/Unix
MySQL and Windows
MySQL and macOS
MySQL and Solaris
Building MySQL from Source
MySQL Restrictions and Limitations
MySQL Partitioning
MySQL Tutorial
MySQL Performance Schema
MySQL Replication
Using the MySQL Yum Repository
MySQL NDB Cluster 8.0