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ORA-30926: unable to get a stable set of rows in the source tables
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and watch for .trc files in UDUMP when it occurs.
2) Having found the SQL statement, check if it is correct (perhaps using explain plan or tkprof to check the query execution plan) and analyze or compute statistics on the tables concerned if this has not recently been done. Rebuilding (or dropp...
Data access object (DAO) in Java
... have to provide a concrete implementation for that interface to deal with SQL server, and another to deal with flat files, etc.
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T-SQL - function with default parameters
... answered Dec 2 '11 at 15:11
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Simplest way to do a recursive self-join?
What is the simplest way of doing a recursive self-join in SQL Server? I have a table like this:
5 Answers
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Logstash实践: 分布式系统的日志监控 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...日志量的增大，可以增大flush_interval的值以提高文件写入性能。
Indexer的配置文件中，我明确指定了message_format的格式，其中%{host}对应的就是之前手动设置的host元数据。
3.5. 启动Logstash
# 先在Indexer主机上启动
nohup /usr/local/lo...
Add a column to a table, if it does not already exist
I want to write a query for MS SQL Server that adds a column into a table. But I don't want any error display, when I run/execute the following query.
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Find nearest latitude/longitude with an SQL query
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Google's solution:
Creating the Table
When you create the MySQL table, you want to pay particular attention to the lat and lng attributes. With the current zoom capabilities of Google Maps, you should only need 6 digits of precision after the decimal. To keep the storage space require...
Does Foreign Key improve query performance?
...Keys are a referential integrity tool, not a performance tool. At least in SQL Server, the creation of an FK does not create an associated index, and you should create indexes on all FK fields to improve look up times.
shar...
LINQ to SQL - Left Outer Join with multiple join conditions
I have the following SQL, which I am trying to translate to LINQ:
6 Answers
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Generating a UUID in Postgres for Insert statement?
...default. You must load it into your database to use it.
For modern PostgreSQL versions (9.1 and newer) that's easy:
CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
but for 9.0 and below you must instead run the SQL script to load the extension. See the documentation for contrib modules in 8.4.
For...