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https://dev.mysql.com/doc/refman/8.4/en/mysqlshow.html
The mysqlshow client can be used to quickly see which databases exist, their tables, or a table's columns or indexes. If no table is given, all matching tables in the database are shown. If no column is given, all matching columns and column types ...The same information can be obtained by using those statements ...
https://dev.mysql.com/doc/refman/8.4/en/optimizing-myisam-bulk-data-loading.html
For a MyISAM table, you can use concurrent inserts to add rows at the same time that SELECT statements are running, if there are no deleted rows in middle of the data file. With some extra work, it is possible to make LOAD DATA run even faster for a ... These performance tips supplement the general guidelines for fast inserts in Section 10.2.5.1, “Optimizing INSERT ...
https://dev.mysql.com/doc/refman/8.4/en/cost-model.html
The primary key for the server_cost table is the cost_name column, so it is not possible to create multiple entries for any cost estimate. The server recognizes these cost_name values for the server_cost table: disk_temptable_create_cost, ...These ... To generate execution plans, the optimizer uses a cost model that is based on estimates of the cost of various operations that occur during query ...
https://dev.mysql.com/doc/refman/8.4/en/data-size.html
Row Format InnoDB tables are created using the DYNAMIC row format by default. To use a row format other than DYNAMIC, configure innodb_default_row_format, or specify the ROW_FORMAT option explicitly in a CREATE TABLE or ALTER TABLE statement. To ...
https://dev.mysql.com/doc/ndbapi/en/mccj-clusterj-session.html
Table 4.47 createQuery(QueryDefinition<T>) Parameter Description qd the query definition return the query instance 4.3.1.22.5 currentTransaction() public abstract Transaction currentTransaction(); Get the current com.mysql.clusterj.Transaction. This ...Session extends AutoCloseable so it can be used in the try-with-resources ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-clone-tables.html
If the clone plugin is loaded but disabled, the tables are not created. The following sections describe the Performance Schema tables associated with the clone plugin (see Section 7.6.7, “The Clone Plugin”). The Performance Schema clone tables ...clone_status: status information about the current or last executed cloning ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-tp-thread-group-stats-table.html
The tp_thread_group_stats table has these columns: TP_GROUP_ID The thread group ID. WAKE_THREAD_STALL_CHECKER The number of times the stall check thread decided to wake or create a thread to possibly handle some statements or take care of the waiter ...This number is incremented when a statement starts executing, not when it ...
https://dev.mysql.com/doc/refman/8.4/en/request-access.html
This is where the privilege columns in the grant tables come into play. These privileges can come from any of the user, global_grants, db, tables_priv, columns_priv, or procs_priv tables. (You may find it helpful to refer to Section 8.2.3, “Grant ... After the server accepts a connection, it enters Stage 2 of access ...
https://dev.mysql.com/doc/mysql-ai/9.4/en/mys-ai-genai-rag.html
The examples in this topic use the vector store table demo_embeddings created in the section Ingesting Files into a Vector Store. OutputTableName: the name of the table where you want to create a new column to store the generated outputs. If the ...
https://dev.mysql.com/doc/refman/8.4/en/index-page-merge-threshold.html
Setting MERGE_THRESHOLD for a Table You can set the MERGE_THRESHOLD value for a table using the table_option COMMENT clause of the CREATE TABLE statement. row *************************** INDEX_ID: 91 NAME: id_index TABLE_ID: 68 TYPE: 0 N_FIELDS: 1 ...The MERGE_THRESHOLD for index pages can be defined for a table or for individual ...If the “page-full” percentage for an index page falls below the MERGE_THRESHOLD value when a row is deleted or when a row is shortened by an ...