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Ask Tom "Bitmap indexes and locking "
Many rumors revolves around what exactly gets locked (and how) during a DML operation on column\row with Bitmap index, it starts with a full exclusive lock ...
asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_Q...
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DBAzine.com: Understanding Bitmap Indexes
Jan 5, 2006 ... In the bitmap index, every entry consists of a set of flags, a lock byte, and ( in this case) four columns of data. ...
www.dbazine.com/oracle/or-articles/jlewis3
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Laurent Schneider » why is bitmap index not designed for OLTP
Whereas a B*Tree index has individual entries for each row in a table so that updating a table row only causes us to lock one index entry, a bitmap index ...
laurentschneider.com/wordpress/2007/03/why-is-bitm...
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How to Use Oracle (21) - Bitmap indexes
Feb 20, 2007 ... In the overhead of a bitmap index entry there is a single lock byte. So how many index 'rows' are affected by that lock? ...
it.toolbox.com/blogs/confessions/how-to-use-oracle...
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Bitmap Index Internals
When a bitmap index is updated, a row lock is taken for the index leaf entry. The index leaf entry contains a bitmap which may cover many rows across a ...
www.juliandyke.com/Presentations/BitmapIndexIntern...
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Alternative solution to BITMAP index
I created BITMAP Index on col1 and both queries started working fast, but this solution is NOT acceptable by our DBA, as BITMAP Index will lock records ...
searchoracle.techtarget.com/answer/Alternative-sol...
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Feb 2008 - Dealing with Lock Contention
Bitmap index lock contention will appear to be row level lock contention except that the object being waited for will be the relevant bit map index. ...
www.toadworld.com/EXPERTS/GuyHarrisonsImprovingOra...
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Data Access Methods
Bitmap indexes are thus highly advantageous for complex ad hoc queries that contain lengthy WHERE clauses. ... a bitmap index on a column with unique values would lock one rowid ...
www.cs.umbc.edu/help/oracle8/server.815/a67775/ch6...
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Feb 2008 - Dealing with Lock Contention
Some contention for locks is inevitable in even the most well tuned multi-user transactional application. ... Bitmap index lock contention will appear to be row level lock ...
www.toadworld.com/Knowledge/DatabaseKnowledge/GuyH...
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Data Access Methods
You can use bitmap indexes effectively in such cases, unless a high concurrency ... example, a bitmap index on a column with unique values would lock one ROWID per ...
download.oracle.com/docs/cd/A58617_01/server.804/a...
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Data Access Methods
Using Bitmap Indexes ... How to Choose Columns to Index ... Such a share lock will be a problem only if the Products table itself is subject to frequent DML. In the example shown we mi...
www.pitt.edu/AFShome/h/o/hoffman/public/html/orado...
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Tx lock problem with bitmap index - Oracle Server
Hi, I am facing a possible oracle limitation in Oracle 8.1.6 (Solaris 7) in bitmap index. Unfortunately upgrade is not an option. ...
www.justskins.com/forums/tx-lock-problem-with-bitm...
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Designing Data Warehouse Applications
Fast Full Index Scan ... Even though Oracle Parallel Server is a cornerstone of parallel query on clusters and MPPs, in a mostly query environment the overhead on the distributed lock man...
www.pitt.edu/AFShome/h/o/hoffman/public/html/orado...
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Linux-Kernel Archive: [patch 1/2] HFS: Convert bitmap_lock in a mutex
Apple Macintosh file system: The semaphore bitmap_lock is used as a mutex. Convert it to the mutex API Signed-off-by: Matthias Kaehlcke Index: hfs/bitmap.c
lkml.indiana.edu/hypermail/linux/kernel/0805.1/120...
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E-Magazine - Back Number:LOCK 7
In this issue, I continue analyzing the bitmap index structure in detail by using block dump. ... the bitmap index structure in order to resolve the lock problem. ...
www.insight-tec.com/en/mailmagazine/vol069.html
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Linux-Kernel Archive: Re: [patch 1/2] HFS: Convert bitmap_lock in a ...
Apple Macintosh file system: The semaphore bitmap_lock is used as a mutex. Convert it to the mutex API Signed-off-by: Matthias Kaehlcke --Index: linux-2.6/fs ...
lkml.indiana.edu/hypermail/linux/kernel/0805.1/120...
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Data Access Methods
Using Bitmap Indexes ... Choosing Columns and Expressions to Index ... Such a share lock is a problem only if the PRODUCTS table is subject to frequent DML.
www.csee.umbc.edu/help/oracle8/server.815/a67775/c...
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The Eric S. Emrick Blog: Low Cardinality != Bitmap Index
Mar 6, 2009 ... I then asked them to tell me why this index was a bitmap index. ... not what you might have thought: locks against rows with the same bitmap ...
esemrick.blogspot.com/2009/03/low-cardinality-bitm...
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