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The posts here are solely my personal views and opinion. Any technical advice or instructions are based on my own personal knowledge and experience, and should only be followed by an expert after a careful analysis or consultation with technical support. Please test any actions before performing them in a critical or nonrecoverable environment. Any actions taken based on my experiences should be done with extreme caution. I am not responsible for any adverse results. I do not represent any vendor or product.
Tag Archives: performance
DB2 V10 Adaptive Compression
Last February, I wrote about DB2′s compression. If that was McLaren, with DB2 V9.7′s compression, IBM upgraded to Lamborghini Aventador. Apparently IBM’s thirst didn’t stop there, they went one more step ahead and got the Bugatti Veyron with DB2 V10′s … Continue reading
Posted in db2, how to
Tagged adaptive compression, adc, admintabinfo, admin_get_index_compress_info, admin_get_tab_compress_info, admin_get_tab_info, automatic dictionary creation, classic compression, compress yes, database compression, db2 compression, db2 performance, db2 tuning, db2 udb, db2 v10 compression, deep compression, performance, resetdictionary, row compression
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Optimization profiles in DB2 UDB
How many times have we spend hours trying to figure why DB2 is not choosing a particular index and access path ? Probably many ! DB2 is one of the best cost based optimizer out there , but yet … Continue reading
Posted in database, db2, how to
Tagged access path, current optimization profile, db2 hints, db2 index usage, db2 optimizer, db2 performance, db2 tuning, explain, explain plan, force access path, force index usage, hints, opt hint, optguidelines, optimization profile, optprofile, opt_profile, performance, stmtprofile, sysinstallobjects, tuning
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DB2 Compression
Sales Pitch Deep compression as IBM likes to call it, is a nice little feature available in DB2 UDB since V9.1. It has grown better and better as each versions goes by. In DB2 v9.7, the index and the temporary … Continue reading
I know stage 1 and stage 2 predicate…whats stage 3 and 4 ??
When tuning a SQL, one of the things a DBA looks at is to see whether the predicate in the SQL is stage 1 or stage 2. So what is stage 1 and stage 2. Basically when DB2 optimizer evaluates … Continue reading
Posted in db2
Tagged database manager, db2, optimizer, performance, predicate, RDS, sql, sql tuning, stage 1, stage 2, stage 3, stage 4, tuning
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