getBackupMeta

Syntax

getBackupMeta(backupDir, dbPath, partition, tableName)

Arguments

backupDir is a string indicating the directory where the backup is saved.

dbPath is a string indicating the path of a DFS database. For example: "dfs://demo".

partition is a string indicating the path of a partition under the database. For example: "/20190101/GOOG".

Note:

For versions between 1.30.16/2.00.4 -1.30.18/2.00.6, if chunkGranularity is set to "TABLE" when creating the database, partition must include the physical index (which you can get with the listTables function) of the selected partition. For example, if the physical index of the "/20190101/GOOG" partition is 8, then specify partition as "/20190101/GOOG/8" to load its backup information.

tableName is a string indicating a distributed table name.

Details

Return a dictionary with information about the backup of a partition in a DFS table, which contains the following keys:

schema: the schema of the table
dfsPath: the DFS path to database chunks
rows: the number of records in a chunk
chunkID: the chunk ID
cid: the commit ID

Examples

getBackupMeta("/home/DolphinDB/backup","dfs://valuedb", "/200001M","pt")
// output
schema->
name  typeString typeInt extra comment
----- ---------- ------- ----- -------
month MONTH      7
x     INT        4

dfsPath->dfs://valuedb/200001M/b39
rows->750000
chunkID->0061427c-4b24-e3b6-425c-c0e1553d3c35
cid->13349