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AdministeringIn addition to administering the database server, you can tune performance, replicate data, and archive data.
System administrationThese topics contain concepts, procedures, and reference information for database and database server administrators to use for managing and tuning HCL OneDB™ database servers.
Performance GuideThe HCL OneDB™ Performance Guide describes how to configure and operate your HCL OneDB™ database server to improve overall system throughput and to improve the performance of SQL queries.
LockingThe database server uses locks, which can affect concurrency and performance. You can monitor and administer locks.
LocksA lock is a software mechanism that you can set to prevent others from using a resource. You can place a lock on a single row or key, a page of data or index keys, a whole table, or an entire database.
Locking granularityThe level and type of information that the lock protects is called locking granularity. Locking granularity affects performance.

Locking granularity

The level and type of information that the lock protects is called locking granularity. Locking granularity affects performance.

When a user cannot access a row or key, the user can wait for another user to unlock the row or key. If a user locks an entire page, a higher probability exists that more users will wait for a row in the page.

The ability of more than one user to access a set of rows is called concurrency. The goal of the database administrator is to increase concurrency to increase total performance without sacrificing performance for an individual user.