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Query Optimizations
Different query optimizations and how you can use and tune them to get better performance.
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Index Hints: How to Force Query Plans
Using hints to get the optimizer to use another query plan. -
Subquery Optimizations
Articles about subquery optimizations in MariaDB. -
Optimization Strategies
Various optimization strategies used by the query optimizer. -
Optimizations for Derived Tables
Optimizations for derived tables, or subqueries in the FROM clause -
Table Elimination
Resolving queries without accessing some of the tables the query refers to -
Statistics for Optimizing Queries
Different statistics provided by MariaDB to help you optimize your queries -
MIN/MAX optimization
How MIN and MAX are optimized -
Filesort with Small LIMIT Optimization
MariaDB 10's filesort with small LIMIT optimization -
LIMIT ROWS EXAMINED
Means to terminate execution of SELECTs that examine too many rows. -
Block-Based Join Algorithms
Algorithms that employ a join buffer for the first join before starting to look in the second. -
index_merge sort_intersection
Operation to allow the use of index_merge in a broader number of cases -
MariaDB 5.3 Optimizer Debugging
MariaDB 5.3's optimizer debugging patch -
optimizer_switch
Server variable for enabling specific optimizations. -
Extended Keys
Optimization using InnoDB/XtraDB key components to generate more efficient execution plans. -
How to Quickly Insert Data Into MariaDB
Techniques for inserting data quickly into MariaDB -
Index Condition Pushdown
Index Condition Pushdown optimization -
Query Limits and Timeouts
Different methods MariaDB provides to limit/timeout a query. -
Aborting Statements that Exceed a Certain Time to Execute
Aborting statements that take longer than a certain time to execute. -
Partition Pruning and Selection
Partition pruning is when the optimizer knows which partitions are relevant for the query -
Big DELETEs
How to DELETE lots of rows from a large table -
Data Sampling: Techniques for Efficiently Finding a Random Row
Fetching random rows from a table (beyond ORDER BY RAND()) -
Data Warehousing High Speed Ingestion
Ingesting lots of data and performance is bottlenecked in the INSERT area. What to do? -
Data Warehousing Summary Tables
Creation and maintenance of summary tables -
Data Warehousing Techniques
Improving performance for data-warehouse-like tables -
Equality propagation optimization
Basic idea Consider a query with a WHERE clause: WHERE col1=col2 AND ... t... -
FORCE INDEX
Similar to USE INDEX, but tells the optimizer to regard a table scan as very expensive. -
Groupwise Max in MariaDB
Finding the largest row for each group -
GUID/UUID Performance
GUID/UUID performance (type 1 only) -
IGNORE INDEX
Tell the optimizer to not consider a particular index. -
Optimizing for "Latest News"-style Queries
Optimizing the schema and code for "Latest News"-style queries -
Pagination Optimization
Pagination, not with OFFSET, LIMIT -
Pivoting in MariaDB
Pivoting data so a linear list of values with two keys becomes a spreadsheet-like array -
Rollup Unique User Counts
Technique for counting unique users -
Rowid Filtering Optimization
Rowid filtering is an optimization available from MariaDB 10.4. -
USE INDEX
Find rows in the table using only one of the named indexes.
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