By IBM Redbooks
This Redbook discusses the built-in setting of DB2 UDB and WebSphere program Server (WAS), together with layout issues, most sensible practices, operation, tracking, and function tuning.
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Extra resources for DB2 UDB V8 and WebSphere V5: Performance Tuning and Operations Guide
As platforms include native support for 64-bit integers, the processing is much faster than with decimal, and more precise than double or real. • Single-precision floating-point (REAL) is a 32-bit approximation of a real number. 402E+38. • Double-precision floating-point (DOUBLE or FLOAT) specifies a floating-point number that is 64 bits long. 79769E+308, or they can be 0. • Decimal (DECIMAL or NUMERIC) specifies a mainframe packed decimal number with an implicit decimal point. The position of the decimal point is determined by the precision and scale of the number.
The left side of the picture shows that without the connection concentrator, the number of coordinator agents is as many as the number of client connections. This consumes a lot of system resources if there are many connections active on a database server. When the connection concentrator is activated, the number of coordinator agents decreases because the coordinator agents are within a pool and accessible for different connections. When the number of coordinator agents shrinks, the number of subagents also reduces, as shown in right side of the figure.
This mode is similar to an X lock except that it is compatible with the NS lock. Rows This lock is acquired on the next row when a row is inserted into the index of a non-catalog table. The lock owner can read but not update the locked row. This mode is similar to X and NX locks except that it is compatible with the W and NS locks. X (Exclusive) Rows, tables W (Weak Exclusive) Rows Z (Superxclusive) Table space, tables The lock owner can both read and update data in the locked row or table. Tables can be Exclusive locked, meaning that no row locks are acquired on rows in those tables.
DB2 UDB V8 and WebSphere V5: Performance Tuning and Operations Guide by IBM Redbooks