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Monthly Archives: October 2007

Authomatic statistics gathering

Monday, October 29, 2007

Oracle 10g has a feature where it gathers optimizer statistics automatically at night. This is done through a scheduled job called GATHER_STATS_JOB. If you want to disable this, you have to issue : EXEC dbms_scheduler.disable(’GATHER_STATS_JOB’); To enable it again : EXEC dbms_scheduler.enable(’GATHER_STATS_JOB’); The following query shows when this job was run : SELECT * FROM [...]

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Using pyparsing

Wednesday, October 24, 2007

The day after I hyped the Getting Started with PyParsing book, I got to use it. Here’s the script : from pyparsing import SkipTo, Suppress, CaselessLiteral import glob # Example to match # delete from TABLENAME # where CUSTOMER_ID = ‘INTERNAL’; table_name = SkipTo(“where”) where_clause = SkipTo(‘;’) delete_stmt = Suppress(“delete”) + Suppress(“from”) + table_name + [...]

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NLS_LANG settings

Wednesday, October 24, 2007

To get the language setting of the current session : SELECT USERENV (‘language’) FROM DUAL; This returns the database character set, not the user’s though. The NLS settings can be found in the following list, in this order. If a value is specified in NLS_SESSION_PARAMETERS, it has preference over a value in NLS_INSTANCE_PARAMETERS. NLS_SESSION_PARAMETERS NLS_INSTANCE_PARAMETERS [...]

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PyParsing

Monday, October 22, 2007

I just bought and read the Getting Started with Pyparsing PDF book. And it’s good. PyParsing is a way of building a parser using Python code. You should think Yacc/Lex, but readable. It can be used to parse text, and it can also handle HTML. This is the example from the PyParsing website : from [...]

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