If this columnis NULL, there are no relevant indexes. In this case, you may be able toimprove the performance of your query by examining the WHERE clause to checkwhether it refers to some column or columns that would be suitable forindexing. If so, create an appropriate index and check t...
memory tuning, and using third-party monitoring tools, developers can effectively pinpoint and resolve performance bottlenecks. This methodical approach not only aids in optimizing stored procedures but also in maintaining overall database performance. ...
“The scale and volume of data we handle meant that, prior to using pganalyze, I had no easy visibility into this information. pganalyze has saved me at least a day of forensic analysis when debugging database problems.” - Jon Erdman, Senior Postgres DBA, Bitbucket Cloud ...
A customer encountered a performance failure in its database system where a large number of transactions were congested. The direct cause was that CPU utilization reaches 100% on some OBServer nodes, which means that transactions cannot be processed normally. Based on the analysis of theGV$OB_SQL...
Indexing Decisions:Determine if adding indexes could improve performance. Performance Monitoring:Monitor queries with real-time execution statistics to gauge query efficiency. Summary: The EXPLAIN command is a powerful tool in PostgreSQL that allows database administrators and developers to analyze and optim...
STORED Column Indexing Indexes Performance OptimizationHome docs MySQL Clauses StatementsKeywordsExpressionsFunctionsIndexesPerformance Optimization MySQL EXPLAIN ANALYZE for Index Usage Indexes Indexes in MySQL are data structures that improve the speed of data retrieval operations on a database table. They ...
This distinction is crucial for INSERT, UPDATE, or DELETE queries, as the EXPLAIN ANALYZE MySQL tool will modify the database. What issues EXPLAIN can solve EXPLAIN is helpful when you want to know if a query does what it is supposed to do. First, check the data in each column of the...
‘Become a MySQL DBA’ blog series. Our previous posts in the DBA series includeDatabase Indexing,Deep Dive pt-query-digest,Analyzing SQL Workload with pt-query-digest,Query Tuning Process,Configuration Tuning,Live Migration using MySQL Replication,Database Upgrades,Replication Topology Changes,Schema...
If this columnis NULL, there are no relevant indexes. In this case, you may be able toimprove the performance of your query by examining the WHERE clause to checkwhether it refers to some column or columns that would be suitable forindexing. If so, create an appropriate index and check ...
Here we see, among other things, the time the query took to run, along with how many documents were returned,nReturned, and how many documents were examined by the database,totalDocsExamined. As mentioned in my post onindexing, ideally these two numbers should be very close to the same ...