Search Results
https://dev.mysql.com/doc/refman/8.4/en/generated-column-index-optimizations.html
For example: CREATE TABLE t1 (f1 INT, gc INT AS (f1 + 1) STORED, INDEX (gc)); The generated column, gc, is defined as the expression f1 + 1. The column is also indexed and the optimizer can take that index into account during execution plan ...You ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-programs-ndb-index-stat.html
ndb_index_stat provides per-fragment statistical information about indexes on NDB tables. This includes cache version and age, number of index entries per partition, and memory consumption by indexes. Running ndb_index_stat with the --update option ...You can estimate the total number of entries by multiplying this by the number of fragments (shown as ...
https://dev.mysql.com/doc/refman/8.4/en/spatial-index-optimization.html
MySQL permits creation of SPATIAL indexes on NOT NULL geometry-valued columns (see Section 13.4.10, “Creating Spatial Indexes”). The optimizer checks the SRID attribute for indexed columns to determine which spatial reference system (SRS) to ...
https://dev.mysql.com/doc/internals/en/optimizer-index-join-type.html
Consider this query: SELECT column1 FROM Table1; If column1 is indexed, then the optimizer may choose to retrieve the values from the index rather than from the table. An index which is used this way is called a covering index in most texts. For ...
https://dev.mysql.com/doc/internals/en/indexing-overview.html
Adding index support to a storage engine revolves around two tasks: providing information to the optimizer and implementing index-related methods. The information provided to the optimizer helps the optimizer to make better decisions about which ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-programs-ndb-drop-index.html
Usage ndb_drop_index -c connection_string table_name index -d db_name The statement shown above drops the index named index from the table in the database. Options that can be used with ndb_drop_index are shown in the following table. Warning ...It ...
https://dev.mysql.com/doc/refman/8.4/en/optimization-indexes.html
The best way to improve the performance of SELECT operations is to create indexes on one or more of the columns that are tested in the query. The index entries act like pointers to the table rows, allowing the query to quickly determine which rows ...
https://dev.mysql.com/doc/ndbapi/en/mccj-clusterj-annotation-index.html
4.3.2.5.1 Synopsis @Target(value={java.lang.annotation.ElementType.TYPE, java.lang.annotation.ElementType.FIELD, java.lang.annotation.ElementType.METHOD}) @Retention(value=java.lang.annotation.RetentionPolicy.RUNTIME) public @interface Index { ...
https://dev.mysql.com/doc/refman/8.4/en/using-spatial-indexes.html
The optimizer investigates whether available spatial indexes can be involved in the search for queries that use a function such as MBRContains() or MBRWithin() in the WHERE clause. The following query finds all objects that are in the given ...
https://dev.mysql.com/doc/heatwave/en/mys-hw-genai-vector-index-creation.html
As of MySQL 9.5.0, MySQL HeatWave GenAI automatically creates vector indexes for frequenctly queried VECTOR columns in vector store and embedding tables using advanced index structures such as Hierarchical Navigable Small World (HNSW). Information ...