27 posts
Last post hashed the digest of every field in each row, compressing dozens of fields into a single hash to speed up comparison. But that only compressed the fields — the row count stayed the same. With billions of rows we still can't find the changed records fast enough.
You can't talk about data warehousing without talking about ETL. The term is most common in warehouses, but it isn't limited to them. It's a critical step, so here's a quick introduction to how ETL extraction and comparison work.
After upgrading to a newer Druid, the logs kept throwing errors: discard long time none received connection., jdbcUrl: blah blah. The program ran fine, but staring at a wall of errors is unbearable, so I went into their source to see what was actually going on.
According to the latest results published on the evening of May 20 on TPC-C, the authoritative database ranking, Alipay's self-developed distributed relational database OceanBase scored above the 100-million mark for the first time in the latest TPC-C benchmark, reaching 707 million tpmC — meaning 707 million new orders created per minute, an nearly 11x improvement over the 60.88 million tpmC of October last year.
Navicat Premium merges all Navicat versions into one ultimate version, able to connect to MySQL, Oracle, and PostgreSQL. Navicat Premium lets users drag tables and data from Oracle to MySQL, Postgre...
Weimob stated that this incident severely impacted merchants' operations, and the company's management feels deep self-blame and guilt over it. To address this, Weimob has prepared a 150 million RMB compensation reserve.
Dash is an API documentation browser and code snippet manager. Dash helps you store snippets of code, and instantly search and browse docs for almost any API you might use.
Navicat Premium merges all Navicat versions into one ultimate version that can connect to MySQL, Oracle, and PostgreSQL. Navicat Premium lets users drag and drop tables and data from Oracle to MySQL, from PostgreSQL to MySQL, and from Oracle to PostgreSQL within a single client, and vice versa. In addition, batch jobs for different databases (such as printing reports in MySQL, backing up data in Oracle, and syncing data in PostgreSQL) can be scheduled and run automatically at specific times.
Navicat Premium merges all Navicat versions into one ultimate version that can connect to MySQL, Oracle, and PostgreSQL. Navicat Premium lets users drag and drop tables and data from Oracle to MySQL, from PostgreSQL to MySQL, and from Oracle to PostgreSQL within a single client, and vice versa. In addition, batch jobs for different databases (such as printing reports in MySQL, backing up data in Oracle, and syncing data in PostgreSQL) can be scheduled and run automatically at specific times.
I ran into this problem while deploying a project at a client's environment. The project's MySQL connection string was localhost, but it errored out saying the database couldn't be connected, and the connection string had been replaced with 127.0.0.1. At first I thought it was a network connectivity issue, so I ran mysql -u root -p and found I could connect fine; ping localhost also resolved to 127.0.0.1. I suspected a mismatched MySQL JDBC driver and swapped countless driver jars, but I was sure it wasn't my program, so I started Googling and found many people with the same situation. I'm summarizing it here for reference. The type of problem I hit was a permissions issue.
