clients as a Consultant, Insource or Outsource.I have done 200+ Operations in this clients such as Exadata Installation & PoC & Migration & Upgrade, Oracle & SQL Server Database Upgrade, Oracle RAC Installation, SQL Server AlwaysOn Installation, Database Migration, Disaster Recovery, Backup Restore, Performance Tuning, Periodic Healthchecks.I have done 2000+ Table replication with Goldengate or SQL Server Replication tool for DWH Databases in many clients.If you need Oracle DBA, SQL Server DBA, APPS DBA, Exadata, Goldengate, EBS Consultancy and Training you can send my email adress. G3log is made with plain C++14 (C++11 support up to release 1.3.2) with no external libraries (except gtest used for unit. I am Founder of SysDBASoft IT and IT Tutorial and Certified Expert about Oracle & SQL Server database, Goldengate, Exadata Machine, Oracle Database Appliance administrator with 10+years experience.I have OCA, OCP, OCE RAC Expert Certificates I have worked 100+ Banking, Insurance, Finance, Telco and etc. makin - makin - reveal anti-debugging and anti-VM tricks This project is not maintained anymore g3log - G3log is an asynchronous, 'crash safe', logger that is easy to use with default logging sinks or you can add your own. If a large table is joined with a small table, If they don’t use Nested loop Join, use Nested loop Join hint.ĭo you want to learn Oracle Database Performance Tuning detailed, then Click this link. You should examine execution plan carefully, If 2 large tables are joined, If they don’t use Hash Join, use Hash Join hint.
Wildcard (%) usage LIKE ‘%abc’ causes full table scan, so avoid Using wildcard (%). Using wildcard (%) at the beginning of a predicate is a known performance problem in all databases. What is Index and Why Should We Use Index? Read the following article to learn Index detailed. You should monitor it, If it is good for performance, you can keep it, if not you should drop it.
Most common mistake is using Index, Index is not good everytime. We can also talk on Football, Gaming, World Politics, Monetary Systems. Loves programming and working with emerging tech.
You should drop unused index on tables, monitor all indexes and check them if they are unnecessary and unused, you should drop them. No comments Get 100 FREE credit & hosting at scale MongoDB NodeJS Tutorial. Hint usage is the last thing you should consider for Performance tuning or it is a temporary solution. Hint usage is not recommended instead optimizing your code. Because ORDER BY, GROUP BY causes sorting and result in one of the most expensive operations in SQL execution. It is recommended to avoid ORDER BY, GROUP BY clause, if using ORDER BY, GROUP BY clause is not mandatory for you. Emscripten: An LLVM-to-WebAssembly Compiler mongo - The MongoDB Database rocksdb.
Because Outer join limits the database optimization optionsĢ6 – Avoid ORDER BY and GROUP BY If possible various IETF indices to BibTeX Batchfile (2) python-guide - Python best. Inner join is recommended instead of Outer Join if possible.
In this tutorial, we'll see how to work with geospatial queries in the MongoDB C driver. WHERE SUBSTR(a.id, INSTR(b.id, ',') - 1) = SUBSTR(b.id, INSTR(b.id, ',') - 1)Ģ5 – Prefer INNER JOIN instead of OUTER JOIN If you've ever glanced at a map to find the closest lunch spots to you, you've most likely used a geospatial query under the hood Using GeoJSON objects to store geospatial data in MongoDB Atlas, you can create your own geospatial queries for your application. You should avoid using complex expression in SQL to prevent the optimizer from assigning valid cardinality or selectivity estimates. IN is used for selective predicate is in the sub query,and EXISTS is used for selective predicate is in the parent query. main.go > o.You should use IN instead of OR in the where clause.